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11-07-2006, 11:51 AM
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CC Member
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Join Date: Jan 2001
Location: upminster, essex, uk,
uk
Cobra Make, Engine:
Posts: 241
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Not Ranked
Engine DE-tuning!
Ok, this may be a strange question, but is it possible to easily DE-tune an engine to make it less powerful?
I've got a 408 stroker ( http://www.cobraclub.com/classifieds...7&cat=8&page=1) that puts out 500BHP. It's not going in a cob, but rather a mid engined car that would mean spending BIG money on a gearbox. Could just changing something like the camshaft enable the power to be dropped down? Would a smaller carb (it's currently fitted with an 850cfm double pumper) help or would it just make the engine run too lean and damage it?
Any advice appreciated.
Thanks
Simon 
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At over $6 per gallon, we must REALLY love our cars in the UK !
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11-07-2006, 12:59 PM
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CC Member
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Join Date: Feb 2006
Location: Gore. New Zealand.,
SI
Cobra Make, Engine: DIY Coupe, F/T ,MkIV.
Posts: 808
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Not Ranked
Simon,
To kill torque which may possibly damage your trans, you need to lose compression, particularly at lower rpm. In your case you can do this by fitting cylinder heads with larger chambers and/or pistons with deeper/larger bowls. Also a camshaft with MORE duration/overlap will reduce the effective compression at lower rpm.
When reducing compression DO NOT increase the piston to head clearance by use of thicker gaskets or machining the squish band as this will make your engine more susceptible to detonation.
There is another method where you are required to be extremely careful with the use of the RH & LH pedals but other people tell me it has not proven reliable in the past!
Jac Mac
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11-07-2006, 01:21 PM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,415
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Not Ranked
Can't you just not push the gas pedal down as far?  |
11-07-2006, 01:34 PM
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CC Member
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Join Date: Oct 2000
Location: Crystal Lake,
IL
Cobra Make, Engine: Everett-Morrison, 434 cid
Posts: 977
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Not Ranked
A 390 4bbl or a 2bbl will kill a bunch of power. No, it won't make it run lean.
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11-07-2006, 01:56 PM
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CC Member
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Join Date: Dec 2000
Location: Broken Arrow. OK ( South Tulsa), USA,
OK
Cobra Make, Engine: 66 COBRA FE 427 /4SP. (HCS Coupe w/ 408 Stroker and TKO 600 -sold)
Posts: 5,595
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Not Ranked
Are trying not to buy a ZF transmission for your GT 40?
I believe Scott is right my engine dyno's at 535 hp with a 850 cfm Demon and
only 488 with a 750 Demon. How many HP are you wanting to loose? You might be able to change your intake as well and loose a few hp.
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11-07-2006, 02:09 PM
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CC Member
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Join Date: Feb 2002
Location: Dadeville,
AL
Cobra Make, Engine: Sold my EM.
Posts: 2,459
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Not Ranked
Why not adjust the throttle linkage so full pedal is less that full throttle? Or just slide some carpet behind the gas pedal.
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Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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11-07-2006, 02:15 PM
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Club Cobra Member
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Join Date: Mar 2002
Location: Paris, France. City of wine and food,
Fra
Cobra Make, Engine: Paint:Metalflakes Royal and Abalone stripes registered in France in 1973. Engine: Ford Shelby aluminium block, 482; two 4-barrels 600cfm Holley; Edelbrock Performer Aluminium heads,,fluid damper,4-speeds Aluminium Toploader (short), 2.88rear
Posts: 209
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Not Ranked
Quote:
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Originally Posted by Jac Mac
Simon,
There is another method where you are required to be extremely careful with the use of the RH & LH pedals but other people tell me it has not proven reliable in the past!
Jac Mac
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This is the cheapest method to reduce power and the results are linked to the driver's skills.
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Queenie
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11-07-2006, 04:01 PM
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CC Member
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Join Date: Aug 1999
Cobra Make, Engine:
Posts: 2,888
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Not Ranked
I agree with scottj go with the smaller carb, that's one of the things the Nascar guys do to reduce hp.
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SAAC member and supporter
Club Cranky charter member
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11-07-2006, 04:12 PM
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CC Member
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Join Date: Mar 2002
Cobra Make, Engine:
Posts: 302
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Not Ranked
Wouldn't the smaller carburetor likely give MORE torque in the lower RPM range though? I would like to see what your torque curve looks like. Maybe the answer is as simple as pulling some ignition timing out of it, but I'm thinking that if I REALLY wanted to tame it down, less C.R. would be the only way to go.
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11-12-2006, 10:16 AM
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CC Member
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Join Date: Sep 2002
Location: Mechanicsville!,
PA
Cobra Make, Engine: Unique 427SC/331/5 forward
Posts: 922
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Not Ranked
You could always back the timing off about 6 or 7 degrees. That will kill your outputs top and bottom.
And your fuel mileage. And your throttle response.
Maybe we should just swap my 331 for your 408.
Last edited by turnpike boy; 11-12-2006 at 10:23 AM..
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