Club Cobra GasN Exhaust  

Go Back   Club Cobra > Engine Building, Tuning, and Induction > Small Block Talk

MMG Superformance
Nevada Classics
Keith Craft Racing
Main Menu
Module Jump:
Nevada Classics
Nevada Classics
Keith Craft Racing
Advertise at CC
Banner Ad Rates
Keith Craft Racing
MMG Superformance
MMG Superformance
MMG Superformance
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

Like Tree2Likes
  • 1 Post By Pete Munroe
  • 1 Post By Pete Munroe

Reply
 
LinkBack Thread Tools Rate Thread Display Modes
  #1 (permalink)  
Old 03-09-2013, 11:30 AM
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2003
Location: PVE, CA
Cobra Make, Engine: ERA 289 FIA #2027, 65' 289" PS wheels
Posts: 345
Not Ranked     
Default oil pump pickup height

Guys,

In the process of putting the oil-pan on a 289"/347".

It there an optimum height for the end of the oil-pickup from the bottom of the pan ?

Checking the pickup height with clay, the cork side rail gaskets laying in place but not compressed, it can range from about 0.20" to 0.40".

Was going to split the difference and try to get 0.25-0.30, but thought I would see what some of the engine builders prefer.

FWIW the pan is an AVIAD 8qt. The engine is a hydraulic roller that should top out at 6000 or so.

Would really like to get this thing buttoned up today.

Thanks, Pete
__________________
ERA 289 #2027
Reply With Quote
  #2 (permalink)  
Old 03-09-2013, 01:36 PM
CC Member
Visit my Photo Gallery

 
Join Date: Oct 2003
Posts: 4,078
Not Ranked     
Default

Shoot for .375" or slightly greater.
__________________
Chas.
Reply With Quote
  #3 (permalink)  
Old 03-09-2013, 02:33 PM
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2003
Location: PVE, CA
Cobra Make, Engine: ERA 289 FIA #2027, 65' 289" PS wheels
Posts: 345
Not Ranked     
Default 3/8"

Chas,

Apparently your in good company suggesting pickup clearance at "3/8's"...finally dug out a reference in one of Smokey Yunick's books. His comment was "no closer than 3/8's".

Oil related problems are a touchy subject for me...inconsistent oil pressure cost me the last engine...

Thanks, Pete
__________________
ERA 289 #2027
Reply With Quote
  #4 (permalink)  
Old 03-09-2013, 03:38 PM
CC Member
Visit my Photo Gallery

 
Join Date: Oct 2003
Posts: 4,078
Not Ranked     
Default

Understood Pete. Getting too close to the pan floor can cause a little cavitation. Sorta sucking the pump 'dry'. You want a nice 'cushion' of url under there.
__________________
Chas.
Reply With Quote
  #5 (permalink)  
Old 03-10-2013, 01:02 AM
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2001
Location: E BRUNSWICK N.J. USA,
Posts: 3,841
Not Ranked     
Default between 1/4" and 3/8" clearance

Peter Munroe. Pete you have the clearance between the bottom of the pan and the screen. Get the largest pickup tube for the motor and oil pan. Also add 1 extra quart of oil to the motor to make sure you always have oil around the pickup. Unless the oilpan has no baffles or trap doors you will need to watch this too. Have seen motors lost with trap doors not letting in oil to the sump area. This happens on road courses no street driving unless you get "G" carving. Last note, add an accusump to the car for starting the motor and controlling oil pressures if you should get the high "G" turning feel. This setup has saved many a motor, mine twice. 2 quart is good, 3 is better. Rick L.
Reply With Quote
  #6 (permalink)  
Old 03-11-2013, 04:06 PM
wolf k's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Jul 2010
Location: Augusta, MO
Cobra Make, Engine: Sold ERA FIA 2139, 331 Weber IDF
Posts: 279
Not Ranked     
Default

Pete,
Fill that sump with water and check for leaks at the welds prior to assembly. Ask me how I know.
Wolfgang
Reply With Quote
  #7 (permalink)  
Old 03-11-2013, 08:42 PM
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2003
Location: PVE, CA
Cobra Make, Engine: ERA 289 FIA #2027, 65' 289" PS wheels
Posts: 345
Not Ranked     
Default thanks I'll check that

All,

Think I will try your idea of adding water to oil pan...check for leaks and also take a look at where 6-7-8-9-10 quarts sits in the pan...it is a new pan anyway.

At oil changes always checked the oil level after adding 7qts...8qts...9 to the pan...THEN starting the engine and checking to see how much I need to add after the filter and any passage way drain back has taken place. Never hurts to do it again...

The old pan was the original Cobra type AVIAD with the trap door assembly mounted symmetrically front/rear side/to side. This pan is the newer version of the Cobra AVIAD pan. The new pan's trap door assembly is mounted on the diagonal. Canton offers a similar pan.

Got pickup as high as it will go without elongating bolts holes and it is now at 3/8ths plus...a little...will try clay again before I button it up...but this seems pretty good...(it does take the gasket into account).

Thanks, Pete
ERA Chas likes this.
__________________
ERA 289 #2027
Reply With Quote
  #8 (permalink)  
Old 04-02-2013, 08:35 PM
Rick Parker's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2001
Location: California, Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
Not Ranked     
Default

Running yet Pete?
__________________
Rick

As you slide down the Banister of Life, may the splinters never be pointing the wrong way
Reply With Quote
  #9 (permalink)  
Old 04-02-2013, 10:43 PM
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2003
Location: PVE, CA
Cobra Make, Engine: ERA 289 FIA #2027, 65' 289" PS wheels
Posts: 345
Not Ranked     
Default

Rick, and all.

Oil pickup is now set about 0.40"...(kept getting bad measurements using some sort of putty that was too sticky and elastic to be measurable...found REAL modeling clay at a craft store..made it easy to get repeatable measurements).

Made up a stable TDC fixture that bolts to the block. Used a dial indicator to find TDC consistently...timing pointer is now set pretty close to TDC.

Oil pan is on...used a Jegs rubber pan gasket with grommets.
Let is settle as the end gaskets were slow to pull down...will go around one more time later and add blue locktite when I finally pull up all the bolts tight to the metal grommets.

Today, cleaned up an old head gasket, dug out the head studs, and temporarily set a head on to prepare for claying the valve clearance.

Took two of the old roller lifters apart to remove the springs and set them up as solids for claying the pistons and verifying the valve clearance with the new cam...doubt there will be any problem, but fun (SORT OF!!) to check...set the new cam 2 degrees retarded compared to the old one...ie: straight up...Comp grinds it 4 advanced built in...(I am guessing to accommodate heavy cars)...the Cobra is light and seemed good to shift the power up the rpm band, if only a little. Torque down low has never been a problem.
.
With the cam in a comparatively retarded setting who knows where the clearances will end up. New cam lift is minorly less lift and more duration...Again mainly an exercise to do it. Doubt there is anything close.

Need to verify the geometry on the new roller rockers...the ratio is the same but don't want the rocker touching the stud...not quite sure how to do that other than with machinist blue...which I don't have...something will work...

Actually at this point things are finally coming together...

Pete
ERA Chas likes this.
__________________
ERA 289 #2027

Last edited by Pete Munroe; 04-02-2013 at 10:47 PM.. Reason: typo
Reply With Quote
  #10 (permalink)  
Old 04-03-2013, 02:17 PM
Gaz64's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2008
Location: Brisbane, QLD
Cobra Make, Engine:
Posts: 2,797
Not Ranked     
Default

Quote:
Originally Posted by Pete Munroe View Post
Rick, and all.

Oil pickup is now set about 0.40"...(kept getting bad measurements using some sort of putty that was too sticky and elastic to be measurable...found REAL modeling clay at a craft store..made it easy to get repeatable measurements).

Made up a stable TDC fixture that bolts to the block. Used a dial indicator to find TDC consistently...timing pointer is now set pretty close to TDC.

Oil pan is on...used a Jegs rubber pan gasket with grommets.
Let is settle as the end gaskets were slow to pull down...will go around one more time later and add blue locktite when I finally pull up all the bolts tight to the metal grommets.

Today, cleaned up an old head gasket, dug out the head studs, and temporarily set a head on to prepare for claying the valve clearance.

Took two of the old roller lifters apart to remove the springs and set them up as solids for claying the pistons and verifying the valve clearance with the new cam...doubt there will be any problem, but fun (SORT OF!!) to check...set the new cam 2 degrees retarded compared to the old one...ie: straight up...Comp grinds it 4 advanced built in...(I am guessing to accommodate heavy cars)...the Cobra is light and seemed good to shift the power up the rpm band, if only a little. Torque down low has never been a problem.
.
With the cam in a comparatively retarded setting who knows where the clearances will end up. New cam lift is minorly less lift and more duration...Again mainly an exercise to do it. Doubt there is anything close.

Need to verify the geometry on the new roller rockers...the ratio is the same but don't want the rocker touching the stud...not quite sure how to do that other than with machinist blue...which I don't have...something will work...

Actually at this point things are finally coming together...

Pete
Pete,

Your "fixture" for finding true TDC was the positive stop method?

A paperclip works to check clearance between the rocker stud and rocker arm with valve closed and valve open at full lift.
There are many other clearances to check in the valvetrain: rocker arm to pushrod, pushrod to cyl head, rockerarm to retainer, retainer to valve stem seal, spring coil bind at full lift, valve to piston clearance etc.

These days, cams are ground with advance to allow the "lazy engine builder" to fit the cam "dot to dot". The built-in advance allows for timing chain stretch throughout the life of the engine.
__________________
Gary

Gold Certified Holden Technician

Last edited by Gaz64; 04-03-2013 at 02:24 PM..
Reply With Quote
  #11 (permalink)  
Old 04-03-2013, 04:52 PM
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2003
Location: PVE, CA
Cobra Make, Engine: ERA 289 FIA #2027, 65' 289" PS wheels
Posts: 345
Not Ranked     
Default TDC tool

Gary,

Made this fixture from a aluminum tube...then I saw David Gagnard's idea...he used an open slot which is easier than trying to get the two bolts into the block centered.

The 5/16" pointer bolt is too big, and the #18 pitch thread too coarse. Fit is pretty sloppy. Would try a fine machine screw if I did it again...hard to use to repeat TDC.

The bar did work well to support the dial indicator solidly. My magnetic base was always creeping.

Using the dial indicator had a problem with the new rings causing a chatter as you rotated the crank...hit the bores with WD-40 and that smoothed out and made finding TDC repeatable.

The PAPER CLIP gauge is great idea for checking the rocker arm clearance, I will give that a try.

Thanks, Pete



__________________
ERA 289 #2027
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 05:23 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
Links monetized by VigLink