Looking for some input on some decisions I need to make for a road race only car.

what would be the disadvantages to running a b18b with eagle's 27lb crank and titanium rods at stock height? How much of a loss of torque would there be due to the reduced rotating mass?

The build will include forged pistons running 12:1 or 12.5:1, crower 404's, crower valve train, AEM cam gears, port & polished head, 3 angle valve job, Hondata.

What would be a decent RPM limit which would ensure some sort of longevity (aside from seting the limit after the powerband dies off).

 

Or would the added gain of reduced rotating mass not be worth it?

What about runinng ITR pistons vs CTR vs forged. Forged obviously being lighter but prone to expansion. would the added weight of the ITR pistons or CTR cause too much stress on the motor staying at consistently higher rpm's?

 

since you do not have oil squirters to cool the pistons, I would run forged 11.5:1 or so , not above 12:1 on pump gas if you want longevity. I would also send them to tbone to get coated. I would run a kinda large piston to wall clearance so that you have plenty of room for expansion, just go on the loose side of the recommended specs. I would also look into getting a block girdle and a fluidamper...you are trying to make the safest motor with as broad of a power band as possible...

 

Just finished a similar engine but used a B20 block. For the money use Carrillo Pro A rods 421 gms. I would stay with the stock crank. The Eagles seem 60/40 on needing to be re-machined. The lighter weights do not affect engine TQ, just the accl. rate of the rotating mass. Leave the piston to cyl clearance to what the Mfg. recommends. We peaked at 7400 with the 404's and a little cam adjustments. You do not need a girdle. The most important thing is a proper radiator, and oil cooler.

 

What compression ratio are you running with the 404's? tuning will be done with greddy e-manage.