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 9Likes
01-24-2015, 04:40 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: 9,417
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Not Ranked
I'll come back once more for this....
Jon Kaase won the 2013 Engine Masters Challenge with a DOHC modular Ford engine.
Bore size was 3.720".
Stroke was 4.700"
They pull them over 7000 rpm, averaging the hp from 3000-7000, if I recall correctly.
Those long strokes are just turds, aren't they?
Accufab was 2nd runner up with another long stroke Modular Ford.
Last edited by blykins; 01-24-2015 at 04:44 PM..
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01-24-2015, 05:13 PM
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CC Member
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Join Date: May 2006
Location: St. Louisville,
Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,446
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Not Ranked
Quote:
Originally Posted by blykins
Jon Kaase won the 2013 Engine Masters Challenge with a DOHC modular Ford engine.
Bore size was 3.720".
Stroke was 4.700"
They pull them over 7000 rpm, averaging the hp from 3000-7000, if I recall correctly.
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Brent I'm with you on this, but just to keep things honest. The 4 valve per cylinder heads on the modular flow very well and Kasse certainly made them flow better. If you stuck 2 valve non-canted 60's factory style heads on this bore stroke combination, it would likely be all in by 3000 rpm. If you worked up a good set of modern Windsor heads, you could take it a long way, but I doubt you could match the 4 valve heads.
Good flowing heads have enabled the long strokes to do what was never thought possible. I believe emissions drove the technology that direction. |
01-24-2015, 05:17 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
The question is not whether big stroke engines will rev, it's whether or not a shorter stroke engine might feel like it's revving quicker, and may feel more responsive, than a longer stroke engine, even if that longer stroke engine is indeed more powerful and will indeed rev just as high.  |
01-24-2015, 05:36 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: 9,417
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Not Ranked
Quote:
Originally Posted by patrickt
The question is not whether big stroke engines will rev, it's whether or not a shorter stroke engine might feel like it's revving quicker, and may feel more responsive, than a longer stroke engine, even if that longer stroke engine is indeed more powerful and will indeed rev just as high. |
Too many variables Patrick. Flywheel weight? Rod and piston weight? Piston ring pack drag? Crankshaft weight? Did you know that a cast 428 FE crank is lighter than a forged 427 crank? Otherwise, do you really think that the .200" of stroke is going to make that much of a difference? I don't. |
01-24-2015, 05:40 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Well, under what circumstances would you choose a 4.125" crank over a 4.250" crank for a Cobra FE build?
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