SUPPORT OUR SPONSOR

Go Back   Club Cobra > Club Cobra Tech Areas > Transmission Talk

Welcome to Club Cobra!  The World's largest non biased Shelby Cobra related site!

  •  » Representation from nearly all Cobra/Daytona/GT40 manufacturers
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and nearly 1 million posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

Nevada Classics
MMG Superformance
Main Menu
Nevada Classics
Nevada Classics
MMG Superformance
MMG Superformance
Advertise at CC
Banner Ad Rates
MMG Superformance
Keith Craft Racing
Keith Craft Racing
Keith Craft Racing
December 2024
S M T W T F S
1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29 30 31        

Kirkham Motorsports

Reply
 
LinkBack Thread Tools Rate Thread Display Modes
  #21 (permalink)  
Old 03-21-2010, 03:46 PM
DAVID GAGNARD's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
Not Ranked     
Default

Quote:
Originally Posted by PANAVIA View Post
I like Steel Flywheels, they are durable and tractable. Aluminum can spin faster , but that is just an additional expense I just cant see on a street car.

Zacctly, any motor will "wind up" a little quicker with a lighter flywheel, be it steel or aluminum......I doubt the average guy could really tell the difference, probably looking a a few tenth's of a second.........Unless your all out racing, there is no need for the extra expense of an aluminum flywheel....IMHO of course......

And I have 2 Mustangs with one flywheel of each,I driven both quite a bit........

BTW: there are steel flywheels out there that are almost down to the aluminum weight for about 60% of the price of an aluminum wheel.......

David
__________________
DAVID GAGNARD
Reply With Quote
  #22 (permalink)  
Old 03-22-2010, 11:39 AM
CobraEd's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2000
Location: Northern VA, VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
Not Ranked     
Default

The motor winding up faster is not just some interesting anecdotal side effect. If the engine winds up faster when running full throttle in gear as it will with an aluminum flywheel, that means the car is accellerating faster. It is a waste of hp trying to spin up a 30lb disc from 1,000 rpm to 6,500 rpm as fast as possible. It takes a lot of HP that could be going to the rear wheels. It is a parasitic loss. Think of all the time, money, and effort spent in building up our engines for maximum power. The $100 differnece to get an aluminum flywheel over steel of cast iron is a small price to pay for 1/2 second off your 1/4 mile times as indicated in one of the posts above, or for blowing off the competition on the street. It is free hp that is no longer being wasted trying to rotate a 30lb mass.


.
__________________
LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
________
Utinam logica falsa tuam philosophiam totam suffodiant!
________

Last edited by CobraEd; 03-22-2010 at 11:45 AM..
Reply With Quote
  #23 (permalink)  
Old 03-22-2010, 12:09 PM
DAVID GAGNARD's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
Not Ranked     
Default

Quote:
Originally Posted by CobraEd View Post
The motor winding up faster is not just some interesting anecdotal side effect. If the engine winds up faster when running full throttle in gear as it will with an aluminum flywheel, that means the car is accellerating faster. It is a waste of hp trying to spin up a 30lb disc from 1,000 rpm to 6,500 rpm as fast as possible. It takes a lot of HP that could be going to the rear wheels. It is a parasitic loss. Think of all the time, money, and effort spent in building up our engines for maximum power. The $100 differnece to get an aluminum flywheel over steel of cast iron is a small price to pay for 1/2 second off your 1/4 mile times as indicated in one of the posts above, or for blowing off the competition on the street. It is free hp that is no longer being wasted trying to rotate a 30lb mass.


.
I wont dispute the above graph showing 1/2 second in the quarter mile runs, but look at the dates on the graph, one year apart.....Assuming all things were the same, that's some big gain....I'd have to get more info on the car, yes, it had the same engine, what what about tires, were they the same, weather conditions, same or not, weather alone will play a factor in 1/4 times. driving will also.... One could assume the driver was a better driver a year later and that alone could account for some of the lower ET.......

I've run both flywheels on the street and on a road race car as well as a dirt track car and never saw more than 2/10's or so better times......definetly something you could not feel by the seat of your pants.......

Quote:
I'm having a 460 CI FE built for my ERA with 428 block and steel heads. It will be a torquer and not a radical motor. The builder is suggesting an aluminum flywheel - but mostly because that is what everyone wants. This car is a street roadster recreation and will be strictly street driven by me. I'm questioning if I really need and aluminum flywheel for this and wouldn't be better off with a steel flywheel. What are most people using with a mild to medium build big block motor?
The original question was what to put in the car, "This car is a street roadster recreation and will be strictly street driven by me."

For that use, I'd still recommend a steel flywheel.......JMHO of course....

David
__________________
DAVID GAGNARD
Reply With Quote
  #24 (permalink)  
Old 03-22-2010, 02:21 PM
DougD's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2000
Location: Des Moines, IA
Cobra Make, Engine: Sold my beloved Shelby CSX 4068, Gessford 427 Ford
Posts: 756
Not Ranked     
Default

Quote:
Originally Posted by DAVID GAGNARD View Post
BTW: there are steel flywheels out there that are almost down to the aluminum weight for about 60% of the price of an aluminum wheel.......

David
I agree w/David - pick a lighter weight steel version. Instead of deciding between an aluminum and a steel flywheel, decide whether you want a light or a heavy flywheel. There are vast differences between the different brands, from a featherweight 12-15 lbs to 40 or more. You can't just narrow it down to the two materials they're made from. Given the fatigue characteristics of aluminum vs steel, I'd pick a lightweight steel one every time over an aluminum one. Ask your builder what the weights are for the brands and materials you're considering.
__________________
CSX4068, '69 Bronco, '70 BOSS 302, '87 Mustang GT, '08 Roush Trak Pak
Reply With Quote
  #25 (permalink)  
Old 03-22-2010, 02:51 PM
DAVID GAGNARD's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
Not Ranked     
Default

Right now I have 2, 65 Mustangs, one is a 3200 lb. street car with a standard/stock steel wheel, 3.25 rear gear ratio, I can putt-putt around town in 2cd and 3rd gear at 1000 rpms all day with no problems, no jumping/bucking/spitting/caughing, that car is a pleasure to drive....

The other is a 2700 lb. road race car,3.70 rear gear, 13 lb. aluminum wheel and I can't putt-putt around the paddock in 2cd or 3rd gears at 1000 rpms, it'll buck and kick eveytime.....I wasn't going to put an alum. wheel on that car till the machine shop offered me a brand new one still in the box for 100 bucks, I couldn't pass up that deal......seems they had that and a few other parts along with a block they machined for a guy that never came to pick up his parts nor pay the bill, so the shop was selling off the stuff to recoup money.....

back in my dirt track days we tried an alum. wheel, the car did come off the corners a little crisper, then the track outlawed alum wheels, so we expiremented with taking weight off stock steel wheels... We were running a small block Chevy at the time and you could get stock steel flywheels at any junkyard for 5 bucks a piece.....we had 5 to 8 at one time....we drilled a bunch of holes in some and in one, we turned it down on a lathe and then drilled holes in it and got it down to 12 pounds....I was afraid it would explode, cause it was soo thin and didn't want to drive the car with in it.....I split seat time with a buddy and he drove the car with that wheel the last half of the season with no problems/failures........

I WOULD NOT recommend to anyone to do what we did, it was down right crazy/stupid and dangerous, but we were young and bullet proof, or so we thought....

Normally, small block steel wheels weight in around 30 pounds, aluminum from 12 to 15 depending on brand, I've seen some new steel wheels advertised in the low 20 pound range and to strike a happy meduim, I would use a lightweight steel wheel for the reasons DougD listed above.........

David
__________________
DAVID GAGNARD
Reply With Quote
  #26 (permalink)  
Old 03-22-2010, 03:00 PM
RodKnock's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,591
Not Ranked     
Default

Isn't a steel flywheel about $250 and an aluminum flywheel about $500? Assuming that's about right, isn't worth getting an aluminum flywheel for additional $250? Makes sense to me in a Cobra.

EDIT: It seems to me, and maybe only me, that when building an FE, the $250-$300 or whatever is just a "rounding error."

Last edited by RodKnock; 03-22-2010 at 03:21 PM..
Reply With Quote
  #27 (permalink)  
Old 03-22-2010, 03:54 PM
CobraEd's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2000
Location: Northern VA, VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
Not Ranked     
Default

As I recall, my RAM unit was about $300 about 2 years ago from Jegs. In a light car like a Cobra it makes a huge difference. In a heavier car, not so much. I putt around at 1,000 rpm all the time, very smooth. Take off from lights just off idle, no reving or problems.


.
__________________
LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
________
Utinam logica falsa tuam philosophiam totam suffodiant!
________
Reply With Quote
  #28 (permalink)  
Old 03-22-2010, 03:58 PM
CC Member
Visit my Photo Gallery

 
Join Date: Dec 2001
Location: Louisville, KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
Send a message via AIM to blykins
Not Ranked     
Default

I can do a RAM steel flywheel (for an FE) for about $275, or a PRW steel flywheel for an FE for $225.

For aluminum needs, I usually push the Fidanza. It has all pressure plate patterns and is the lightest (14lbs) between RAM, McLeod, and Centerforce. I can do it for $350.

For small block cars, I have some awesome deals on steel wheels.
__________________
Lykins Motorsports, LLC
Custom SBF/Cleveland/FE/385 Series Engines
Street, Road Race, Drag Race, Pulling Truck
www.lykinsmotorsports.com
www.customfordcams.com
brent@lykinsmotorsports.com
Reply With Quote
  #29 (permalink)  
Old 03-22-2010, 04:20 PM
RodKnock's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,591
Not Ranked     
Default

So, $75-$125 difference. Hmmm.
Reply With Quote
  #30 (permalink)  
Old 03-22-2010, 04:35 PM
greg schroeder's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Scottsdale, AZ
Cobra Make, Engine: Superformance, Roush 427R-095, Pro Systems carb, 2" headers, Buckshot Racefab side pipes, 10s off idle start
Posts: 705
Not Ranked     
Default

Quote:
Originally Posted by DanEC View Post
Well, that's a graphic presentation you don't see every day. So, an aluminum flywheel and clutch change was roughly worth a half second and 5 mph in the quarter? That's something else.
Sorry, I should have given more information. The red line is also about 45 more HP at the wheels. This generally would make things a bit more exagerated, but even with another 45 HP at the wheels it is more in control than a steel flywheel with less power to use.
__________________
off idle drag pass, DA 750ft.
Reply With Quote
  #31 (permalink)  
Old 03-22-2010, 05:40 PM
DAVID GAGNARD's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
Not Ranked     
Default

Quote:
Isn't a steel flywheel about $250 and an aluminum flywheel about $500? Assuming that's about right, isn't worth getting an aluminum flywheel for additional $250? Makes sense to me in a Cobra.
Nothing about stuffing a 600+hp engine in a 90" wheelbase car weighing sometimes as little as 2400 lbs. with no top or side impact bars, no airbags and very little driver protection to start with makes much sense to me........

but that's part of the thrill of having a having a car like that!!!!!!!!

In the grand scheme of things when spending big bucks for a car like a Cobra, a couple of hundred extra dollars is nothing......

it all boils down to whats best for the engine combo and the way the car will be used...

David
__________________
DAVID GAGNARD
Reply With Quote
  #32 (permalink)  
Old 03-22-2010, 10:09 PM
RodKnock's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Feb 2007
Cobra Make, Engine: KMP 539, a Ton of Aluminum
Posts: 9,591
Not Ranked     
Default

Quote:
Originally Posted by DAVID GAGNARD View Post
Nothing about stuffing a 600+hp engine in a 90" wheelbase car weighing sometimes as little as 2400 lbs. with no top or side impact bars, no airbags and very little driver protection to start with makes much sense to me........

but that's part of the thrill of having a having a car like that!!!!!!!!

In the grand scheme of things when spending big bucks for a car like a Cobra, a couple of hundred extra dollars is nothing......

it all boils down to whats best for the engine combo and the way the car will be used...

David
The Kirkhams have been putting their car on a diet for a long while. With the aluminum rear end, Quicktime bellhousing, aluminum flywheel, and an all-aluminum FE, their cars are under 2,150 lbs.

I talked with several FE engine builders before I picked one, but not one of recommended a steel flywheel.

Last edited by RodKnock; 03-23-2010 at 09:56 PM..
Reply With Quote
  #33 (permalink)  
Old 03-23-2010, 06:58 PM
DanEC's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Apr 2009
Location: Little Rock area, AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
Posts: 4,521
Not Ranked     
Default

There doesn't seem to be a clear consensus here. The light car - light flywheel rationale makes simple sense. I guess I will go with the aluminum flywheel as recommended by the builder.

Thanks for the responses.
Reply With Quote
  #34 (permalink)  
Old 03-26-2010, 12:08 AM
Rwillia4's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Aug 2003
Location: San Diego, CA
Cobra Make, Engine: BDR #455, KC427W, TWM-FI
Posts: 727
Not Ranked     
Default

there might not be a clear answer but there is some good information and opinions along with some hard facts. In any case it has me thinking hard...
Reply With Quote
  #35 (permalink)  
Old 03-26-2010, 06:48 AM
DougD's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2000
Location: Des Moines, IA
Cobra Make, Engine: Sold my beloved Shelby CSX 4068, Gessford 427 Ford
Posts: 756
Not Ranked     
Default

Quote:
Originally Posted by DanEC View Post
There doesn't seem to be a clear consensus here. The light car - light flywheel rationale makes simple sense. I guess I will go with the aluminum flywheel as recommended by the builder.

Thanks for the responses.
I've always used the formula one pound of flywheel for every 100 pounds of car. So a 2400lb Cobra would dictate a 24lb flywheel. Once again, it's the weight, not the material it's made from.
__________________
CSX4068, '69 Bronco, '70 BOSS 302, '87 Mustang GT, '08 Roush Trak Pak
Reply With Quote
  #36 (permalink)  
Old 03-26-2010, 06:59 AM
CobraEd's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2000
Location: Northern VA, VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
Not Ranked     
Default

So then in a 4,300 lb Cadillac CTS-V you would need a 43 lb flywheel???? The factory flywheel is 26 pounds.

My son's 03 SVT Cobra Mustang came from the factory stock with a 17 lb aluminum flywheel and that car weighs 3,700+ lbs.


.
__________________
LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
________
Utinam logica falsa tuam philosophiam totam suffodiant!
________

Last edited by CobraEd; 03-26-2010 at 08:01 AM..
Reply With Quote
  #37 (permalink)  
Old 03-26-2010, 08:18 AM
DougD's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2000
Location: Des Moines, IA
Cobra Make, Engine: Sold my beloved Shelby CSX 4068, Gessford 427 Ford
Posts: 756
Not Ranked     
Default

Opinions are all over the board on this. I just offered one.

So why the difference in relative weights on the two cars you listed, in your opinion?
__________________
CSX4068, '69 Bronco, '70 BOSS 302, '87 Mustang GT, '08 Roush Trak Pak
Reply With Quote
  #38 (permalink)  
Old 03-26-2010, 08:33 AM
CobraEd's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2000
Location: Northern VA, VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
Not Ranked     
Default

the 03 Cobra Mustang is (was) a very high performance car from the factory. Ford put an aluminum flywheel on it from the factory because high performace cars run faster/better with lightweight flywheels. Just as an fyi, it also came from the factory with an aluminum driveshaft for the same reasons, . . . less rotational inertia to drain horsepower trying to spool up = a faster more high performance vehicle.


.
__________________
LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
________
Utinam logica falsa tuam philosophiam totam suffodiant!
________
Reply With Quote
  #39 (permalink)  
Old 03-26-2010, 09:00 AM
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Feb 2005
Posts: 651
Not Ranked     
Default

I first drove my 427 in 1994. The engine was and still is 427 cubic inches with a standard stroke crank. The original build used a steel flywheel that weighs 40+ pounds. At the beginning of this Cobra ownership I always thought my engine wound up a little on the slow side when I blipped the throttle for a downshift. I just figured it was normal.

Around the year 2000 I changed the clutch, pressure plate and flywheel. The new flywheel was an over-priced Center Force aluminum unit and weighs about 20 or 22 pounds. What a substantial difference that unit has made. Throttle response is noticeably faster. The engine has felt as though it spools up quicker at full throttle. The aluminum unit is a keeper for my car.

The original steel flywheel is still hanging on the wall in my work shop.

David

Last edited by 601HP; 03-26-2010 at 09:06 AM..
Reply With Quote
  #40 (permalink)  
Old 03-26-2010, 09:09 AM
CobraEd's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2000
Location: Northern VA, VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
Not Ranked     
Default

Quote:
Originally Posted by 601hp View Post
i first drove my 427 in 1994. The engine was and still is 427 cubic inches with a standard stroke crank. The original build used a steel flywheel that weighs 40+ pounds. At the beginning of this cobra ownership i always thought my engine wound up a little on the slow side when i blipped the throttle for a downshift. I just figured it was normal.

Around the year 2000 i changed the clutch, pressure plate and flywheel. The new flywheel was an over-priced center force aluminum unit and weighs about 20 or 22 pounds. What a substantial difference that unit has made. Throttle response is noticeably faster. The engine has felt as though it spools up quicker at full throttle. The aluminum unit is a keeper for my car.:mecool:

The original steel flywheel is still hanging on the wall in my work shop.

David

well there ya go !!!

.
__________________
LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
________
Utinam logica falsa tuam philosophiam totam suffodiant!
________
Reply With Quote
Reply



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 05:50 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: CC Policy