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 11Likes
12-04-2013, 01:42 AM
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CC Member
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Join Date: Feb 2009
Location: Geelong,
Vic
Cobra Make, Engine: DRB, 302 EFI 5 speed 9"
Posts: 221
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Not Ranked
double posted some how
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12-04-2013, 01:23 PM
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CC Member
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Join Date: Apr 2013
Location: wodonga,
vic
Cobra Make, Engine: Python ford 302 ho, 4 speed toploader, jag irs 3.54
Posts: 361
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Not Ranked
thanks ross, sounds like a similiar problem, the guy i have been chatting to is supplying me with a quote for the 670 street avenger carb with dominator bowls twin fuel lines and the edelbrock straight through fuel pump as i have space issues where the fuel pump is located.
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12-04-2013, 02:47 PM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
The street avenger has vacuum secondaries. If you want to maximize all the power your engine can make, get a mechanical secondary carb. The carb selector on Holley's web site even suggests a mechanical secondary carb for our light weight cars. I have replaced the street avenger carbs on both of my cobras (one had a 302, the other a 427) and in both cases, throttle response increased as well as dyno results.
If you stick with the SA carb, you're leaving horsepower on the garage floor.
__________________
Jim
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12-04-2013, 03:04 PM
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CC Member
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Join Date: Apr 2013
Location: wodonga,
vic
Cobra Make, Engine: Python ford 302 ho, 4 speed toploader, jag irs 3.54
Posts: 361
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Not Ranked
Quote:
Originally Posted by jhv48
The street avenger has vacuum secondaries. If you want to maximize all the power your engine can make, get a mechanical secondary carb. The carb selector on Holley's web site even suggests a mechanical secondary carb for our light weight cars. I have replaced the street avenger carbs on both of my cobras (one had a 302, the other a 427) and in both cases, throttle response increased as well as dyno results.
If you stick with the SA carb, you're leaving horsepower on the garage floor.
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i have heard this, but the fuel consumption i have been told would be almost double with the double pumper, effectively leaving me with a total range of about 125klm,
at the moment iam getting about 240-260klm out of a tank with the 465 holley which the tank hold about 50 litres |
12-04-2013, 06:01 PM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
Quote:
Originally Posted by dhs.buckley
i have heard this, but the fuel consumption i have been told would be almost double with the double pumper, effectively leaving me with a total range of about 125klm,
at the moment iam getting about 240-260klm out of a tank with the 465 holley which the tank hold about 50 litres
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Not true. I've done it twice and noticed no difference in fuel consumption. The only way your mileage will go down is if you keep your foot on the floor and leave those secondaries open. Normal driving will be the same as it is right now. But, floor it and all hell will break loose.
Just try it. Cheapest horsepower you'll ever buy. If you don't like the dp, sell it and buy the SA.
__________________
Jim
Last edited by jhv48; 12-04-2013 at 06:06 PM..
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12-04-2013, 07:21 PM
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CC Member
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Join Date: Sep 2006
Location: No city...only 118 residents in Manter,
KS
Cobra Make, Engine: Cobra Auto Works body, Ron Godell Racecars chassis, 1989 Mustang GT 5.0 HO (converted to carb), W/C T-5, 3.73's in a Ford 9" Traction-Loc.
Posts: 812
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Not Ranked
When I bought my replica (I believe it to be a box-stock 5.0HO from a 1989 Mustang GT) it had a Holley 780CFM vacuum secondary carb on it (3310???). It ran like a pig. I swapped it out for an Edelbrock Thunder (the smaller version, I think) and it runs like a scalded-ass ape now...bigger is not always better.
On the other hand, you have some go-fast goodies on yours that I do not have, so you can most likely handle some more carb.
Have you considered a custom built carb? Blykins can take your specs and have a QF made that might just be the ticket.
Cheers!
Dugly 
__________________
YD,E./PNB
No names were changed to protect the innocent! 
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12-04-2013, 08:13 PM
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CC Member
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Join Date: Sep 2004
Location: Canberra,
ACT
Cobra Make, Engine: G-Force Cobra '68 302, T-5, Jag 3.77 LSD.
Posts: 993
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Not Ranked
Quote:
Originally Posted by dhs.buckley
i have heard this, but the fuel consumption i have been told would be almost double with the double pumper,
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Both the vac and mech secondary carbies you would use are square bore so at cruising = no extra fuel consumption, around town if your using more than half throttle = some extra due to the secondary accelerator pump activating some what, but full throttle like track work really works the secondary acc. pump so definatly more on the track - but worth it.
My 302 is out to 310 with cam, heads, mechanical pump, single fuel line with 600 DP square bore about 300 at fly wheel - goes to 6,500 quite regular without starvation.
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SLIPRY
Last edited by David Hodgson; 12-04-2013 at 08:55 PM..
Reason: typo's
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12-04-2013, 08:27 PM
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CC Member
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Join Date: Feb 2002
Location: Alice Springs, central Australia,
NT
Cobra Make, Engine: Classic revival kit (CR3181), gen III engine, T56 6 speed box, AU XR8 lsd diff
Posts: 5,699
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Not Ranked
Fit an LS1
__________________
Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.
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12-04-2013, 09:28 PM
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CC Member
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Join Date: Aug 2008
Cobra Make, Engine:
Posts: 1,106
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Not Ranked
Quote:
Originally Posted by boxhead
Fit an LS1
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Or a Dart block Windsor......
That would be faster..... hey Gav? |
12-05-2013, 05:17 AM
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CC Member
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Join Date: Nov 2009
Location: Cheltenham,
Vic
Cobra Make, Engine: Classic Revival CR3516, LS3, Aussie Mike'd T-56, 3.70 LSD, AP brakes, Penske shocks
Posts: 1,616
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Not Ranked
Quote:
Originally Posted by Towmaster
Or a Dart block Windsor......
That would be faster..... hey Gav?
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Or two crate LS3's and a T-56 with the change.
__________________
BUILD-BLOG: http://cobrablog.holnet.net
Ben in AU
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12-06-2013, 05:09 AM
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CC Member
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Join Date: Apr 2006
Location: Mildura,
vic
Cobra Make, Engine: FFR Coupe, 416ci of LS goodness
Posts: 2,349
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Not Ranked
Quote:
Originally Posted by Towmaster
Or a Dart block Windsor......
That would be faster..... hey Gav?
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Over the quarter?
__________________
Powered by Cu
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12-08-2013, 04:33 AM
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CC Member
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Join Date: Aug 2008
Cobra Make, Engine:
Posts: 1,106
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Not Ranked
Well when you do an official quarter mile time (I don't mean a belt around a southern Victorian town) let me know exactly how much faster you are...  |
12-08-2013, 04:32 PM
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CC Member
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Join Date: Apr 2013
Location: wodonga,
vic
Cobra Make, Engine: Python ford 302 ho, 4 speed toploader, jag irs 3.54
Posts: 361
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Not Ranked
had another little problem on the weekend, after testing the new fuel pump,no carb yet i found things improved a fair bit, but after the run i found my push in oil filler cap had disapeared, only a little bit of oil on the bonnet,
So went down to supercrap and bought a fill in cap non vented for the time being, went for the next run and now found the sump gasket has started to leak, so i checked the engine at idle and there is plenty of suction from the pcv valve, so just wonder why the original cap would of ever popped out,
just wondering if you back off after heavy acceleration if the pressure may revert the other way and popped out the original cap?
Last edited by dhs.buckley; 12-08-2013 at 04:34 PM..
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12-09-2013, 03:21 AM
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CC Member
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Join Date: Aug 2013
Cobra Make, Engine: 1994 drb sbf c4 9inch
Posts: 114
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Not Ranked
made the mistake of leaving both tappet covers fitted with non breathing caps while we were installing au2 motor,made quite the little oil puddle from pressure build up straight out the dipstik tube...silly ol dipstick  ...doc |
12-21-2013, 01:13 PM
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CC Member
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Join Date: Apr 2013
Location: wodonga,
vic
Cobra Make, Engine: Python ford 302 ho, 4 speed toploader, jag irs 3.54
Posts: 361
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Not Ranked
Last edited by dhs.buckley; 12-21-2013 at 01:22 PM..
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12-21-2013, 01:28 PM
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CC Member
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Join Date: Sep 2006
Location: No city...only 118 residents in Manter,
KS
Cobra Make, Engine: Cobra Auto Works body, Ron Godell Racecars chassis, 1989 Mustang GT 5.0 HO (converted to carb), W/C T-5, 3.73's in a Ford 9" Traction-Loc.
Posts: 812
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Not Ranked
I absolutely love the look of the dual-inlet center float Holleys....add a double pumper option and it seems like it should be the perfect carb!
What an improvement to the look under the hood!
Cheer!!!!
Dugly
__________________
YD,E./PNB
No names were changed to protect the innocent!
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12-21-2013, 01:41 PM
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CC Member
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Join Date: Apr 2013
Location: wodonga,
vic
Cobra Make, Engine: Python ford 302 ho, 4 speed toploader, jag irs 3.54
Posts: 361
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Not Ranked
Thanks Dugly, yes thats why i got that model 670 as it has the double pumper option if i feel the need to add it.
It was 41 deg c yesturday or 106 f so not ideal for testing power but the difference was very noticable, the car sat on a steady 195f so the cooling system is doing its job very well at the moment.
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