|02-07-2012, 08:38 AM||#1|
NASIOC Storefront Vendor
Join Date: Nov 2006
Location: Medford, NYVehicle:
To billet crank or to not billet crank, that is the question
Time has come to start building the spare race engine for the car a friend and I are doing. (The one I made the 400lph Walbro post about) The engine in the car currently has a BC 83mm stroker kit in it unsleeved. We assume at 650whp its only a matter of time before she explodes which is OK. He wants to push it, and we have at least doubles if not triples of every part.
The spare motor is getting sent out to get sleeved as soon as the pistons get here
I ordered the JE Billet FSR pistons with coated skirts and domes (balllllin) and a set of Carrillo Pro H rods to compliment. Nicest lightweight rotating assembly, that can handle the abuse that this car will see. Really broke the bank on that one though, lets see if it pays off. This combo is 508 grams, or 1.12lbs lighter than the standard Manley/CP piston + Turbo Tuff rod combo. That is a lot less weight to be swinging around in an engine.
The only thing we are on the fence about now is crank selection. I am torn between using a nitride coated 2011, which I know is a good unit, but unsure of its HP limits, or a K1 or Manley 79mm crank. The money for a $3500 Cosworth isn't in the budget.
If this motor was going to make 500, 550, or 600 I wouldn't think twice and go for the OEM. I want this thing to be able to do a real 750 on a good day. I have no problem admitting that HP level is virgin territory for me with a Subaru.
Planning to rev it on the drag strip to 7500-8000 with a shimmed 11mm pump or the high flow Cosworth (which is probably overkill).
So I am looking for some real world racing advice here.
Japan made? OEM crank vs China made billet crank?
Last edited by No Limit Motorsport; 02-07-2012 at 09:43 AM.
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