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03-01-2009, 12:57 PM
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CC Member
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Join Date: Oct 2002
Location: Eagle,
Ne.
Cobra Make, Engine: 1966 Lone Star 427SC.
Posts: 4,310
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Not Ranked
I do have a straight axle and it would take a lot of work to change to a IRS, and maybe not even work at all. But thank you anyway,
__________________
Regards,
Kevin
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03-01-2009, 01:24 PM
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CC Member
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Join Date: Feb 2008
Location: Jacksonville,
FL
Cobra Make, Engine: Kirkham #570 w Shelby FE
Posts: 1,009
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Not Ranked
Hind sight being 20-20 I wish I had Kieth supply dyno #s below 4500 rpm just to see what the bottom end looked like. I opted for the .82 OD since there were a lot of people complaining about how sluggish the .64 made the acceleration.
Since I'm running the fuel injection, it's probably less of an issue than if I was running a carb.
Ideally the .64 would be a great 6th gear... 
BTW don't forget about changing your input shaft if your going with an FE.. |
03-01-2009, 01:38 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
Quote:
Originally Posted by Ronbo
Hind sight being 20-20 I wish I had Kieth supply dyno #s below 4500 rpm just to see what the bottom end looked like.
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Just stick her on a chassis dyno. Keith runs his dyno numbers without anything on the exhaust (as do a lot of builders). Dyno numbers for an engine sitting on a dyno with no mufflers/sidepipes (and maybe no water pump, etc.) can be very misleading.  |
03-01-2009, 03:43 PM
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CC Member
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Join Date: Feb 2004
Cobra Make, Engine: FFR 390 toploader IRS
Posts: 258
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Not Ranked
not to hi-jack but anyone using a Fidanza flywheel??
http://www.fidanza.com/
__________________
FFR MarkIII,FE,toploader,IRS,3.27,Vintage pin's SOLD!
68 F100 Custom Cab 418 cube FE/auto
99 SuperDuty Tuner/chipped/4" Banks TOTALED!!
02 Super Duty 7.3L
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03-01-2009, 03:56 PM
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CC Member
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Join Date: Oct 2002
Location: Eagle,
Ne.
Cobra Make, Engine: 1966 Lone Star 427SC.
Posts: 4,310
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Not Ranked
A friend has one & likes it.
__________________
Regards,
Kevin
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03-02-2009, 09:12 AM
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CC Member
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Join Date: Mar 2000
Location: Des Moines,
IA
Cobra Make, Engine: Sold my beloved Shelby CSX 4068, Gessford 427 Ford
Posts: 756
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Not Ranked
It's not the material, it's the weight
The material used (aluminum or steel) is less important than the actual weight of the flywheel. There are lightweight steel flywheels out there that approach the weight of aluminum.
For a street car, the rule of thumb I've been told is that the flywheel weight should be approximately 1% of the car's weight. A 4000lb car should have a 40-pound flywheel. A 2500lb car needs a 25 lb flywheel, etc.
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CSX4068, '69 Bronco, '70 BOSS 302, '87 Mustang GT, '08 Roush Trak Pak
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03-02-2009, 09:41 AM
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CC Member
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Join Date: Oct 2002
Location: Eagle,
Ne.
Cobra Make, Engine: 1966 Lone Star 427SC.
Posts: 4,310
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Not Ranked
Ya know, I never thought of that. I know you can get 40 lb and 20 lb. I havent checked but, for debate, how would a Billet flywheel be ?
__________________
Regards,
Kevin
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