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Lookin to get everything out of my f1a. What size motor an what could it run in say a 3400 lb car kind of would like to go back to an aluminium block. Let's here some thoughts.
I would do an LS2 block either 364CID or 402CID (4" Crank). In either of those I would do a forged crankshaft to take the added stress of the blower.
So.
LS2 Block
Forged 3.622" or 4" Crankshaft
Callies CompStar 6.125" Rods
Forged 4.005" Pistons and Rings
ARP Main and Head Studs
ACL, Clevite, or King Bearings
I figured 402 408 maybe 416 going to be the most common thoughts. Right now I have a 376 but don't think I'm willing to push anymore with the parts it has.
If you don't already have a block, I'd chose the ls3 over the ls2 since it is stronger and has improvements vs. the ls2, oh and it has slightly larger bore as well, 4.065 vs 4.000.
It depends on total HP you wish to achieve. The O.E. blocks can hold up to a 1000 flywheel with good prep and parts. If you are looking for more than that you will need to sleeve or go aftermarket.
Personally i believe its gets the pressure ratio too low on the wheel... Centri blowers are just like turbos...
Sean Moore just dyno'd his 370/ F1a combo this weekend... and made 790 to the tire on pump gas... through a converter thats prolly a tick loose with it slipping almost 10% on the track... We redid the top end of his motor and a new cam... and made more power on pump gas this time than the car made on race gas with the old combination...
Personally i believe its gets the pressure ratio too low on the wheel... Centri blowers are just like turbos...
Sean Moore just dyno'd his 370/ F1a combo this weekend... and made 790 to the tire on pump gas... through a converter thats prolly a tick loose with it slipping almost 10% on the track... We redid the top end of his motor and a new cam... and made more power on pump gas this time than the car made on race gas with the old combination...
I'm certainly not trying to call out a guru here, but do you have any evidence to substantiate that claim?
Yeah, I'm not sure what he means by the 'pressure too low on the wheel' statement as well.
I have just a street car, and building a new setup and decided to go with a 4.000" crank because of the added torque down low for being a street car and part throttle fun. I know it will run out of steam and not be a dyno killer with the D1SC on it, but having more out of boost torque was appealing to me.
Bob how do you feel about the f1a on a 416 aluminum block ? I know the iron block is better for boost but I'm trying to save weight just don't see the f1a being to much for that size motor.
The 4" arm will help that F1 turn, don't go big on the bore std. or 4.070" and it will be a good combo. Top it off with some CNC'd LSA's, double key the crank and you will only be limited by the octane your going to run.
Ok, so instead of talking in secret, non-descript terms, why don't you guys actually help some people out and explain what you're talking about.
I get it that the blower needs to match the cubic inches, but isn't that more critical with a turbo where the exhaust gasses are needed to spin it? Too big of a turbo, and it's a turd down low, too small of a turbo, and you create too much backpressure. So how does that translate with a blower that spins at the set rpm determined by gearing and engine rpm, so it produces xxx cfm at a specific rpm?
I get it that by having a 416, it's going to eat up the D1SC and it won't make a lot of boost, but I'd rather make 800rwhp with 10psi of boost than 18psi of boost.
Here's a D1SC on a 572.... seems to make decent power to me. Bet it's fun as hell on the street.
I understand that with a bigger blower, if you don't spin it fast enough to get into the efficiency range, it won't make power, ie, won't move air efficiently. But does the efficiency of the blower depend on the pressure it sees at the intake? I would think that it would be the opposite, that with a lower pressure, it would be more efficient, and make more overall hp.
So please, share some of the super secret turbo knowledge you have, and make this site live up to it's name and bring some technical discussion in here.
Thank you.
Last edited by The Alchemist; Oct 29, 2014 at 09:18 AM.
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Build me a motor for an f1a 
