Thread: just run a few things by you vvl heads

Clearance and compression will be the same.

No oil squirters, no VE oil hole is the difference.

SR16 Pistons with DE 8CW is thought by some to be better than a SR20VE 4CW Crank...

no i have a SR16VE im building with a 2.0 crank and rods.. with SR16VE pistons..

so aside from the squirters and the oil way which is a side issue anyway.. why does having a DE block mean that valves will hit the pistons?

Its not the block for the third time. ITs the lift of the N1 cams he will run and the 16VE pistons on a 2.0 bottom end. With no aftermarket springs and retainers my concern would be what the clearance would be especially at 8000+rpm.

How much deeper are the notches on the N1 piston compared to the 16ve piston? If they are the same there should be no issue. The extra stroke the 2.0 crank provides makes no difference with how high the pistons travel.

I have had 16ve pistons/N1 cams in a 20ve with stock springs over 8k no problem.

whats the story with the redline? can you just set it to what you want to yourself or does the engine decide that? as far as i was aware this was set by the ecu?

If you can program your ECU, you can/should set it where things wont break...

No point of running all these 16VE pistons + N1 cams on a stock SR20VE ECU at all

the 2.0 bottom end has nothing to do with the clearence though.. the pistons all sit at exactly the same hight regardless of the stroke..

N1 pistons as far as im aware dont have deeper notches that have a smaller dome as the heads are skimmed so much at the factory.. also N1 cams can be reved harder than standard 16 cams on standard valve springs as they have a less steep ramp angle..

i dont want to argue but i think your wrong i think he will be fine running sr16ve pistons with N1 cams in a 2.0 as thats what i plan to do.. but he wont be running them wuth a standard 20VE ECU..

5speed said he measured the non N1 SR16VE pistons to have shallower valve reliefs than even the stock SR20VE pistons in the thread below. The only way to be sure is to measure yourself with plasticine. If you don't want to go through the trouble of assembling an engine to find its too tight (although it probably will be fine, you just might be limited with how much you can safely adjust the cams) you could get an extra 1 mm or so machined from the valve reliefs.
http://www.sr20-forum.com/vvl/21063-de-ve-head-swap-question.html

he also said this :-

I also said you'd probably be fine too as many have but there's only one way to be sure with your own build and that's to measure. Its all hearsay until you check for yourself.