Do any of you guys know where could I get some 11:1 or 11:5:1 pistons for the DE but non forged. just normal pistons.

or any recomendations I want to get a higher compression.


or do i go with 10:1 jdm pistons and shave the head to get more compression?



let me know.

thanks in advanced for any of your help.

its spelled compression and you can get VG30DE pistons

Ahh yea i had my doubts about how it was writen oh well thanks :)


And what compression would those pistons have? and from what car are they from? or do you know where i can find them.

those are the pistons from the 300zx TT.

and what compression do they have?

if their from a turbo I think they must be low...not high :S

Correct me anyone if Im wrong but the 300ZX TT has 8:5:1 compression and the non turbo 10:5:1?

the 10:5:1 what would be the bore size to get it on a sr20de?

Originally posted by Digitek
Correct me anyone if Im wrong but the 300ZX TT has 8:5:1 compression and the non turbo 10:5:1?

the 10:5:1 what would be the bore size to get it on a sr20de?

Correct! The non turbo engine has a 10:5:1 compression ratio. Once you bore out the block to fit these pistons on your SR20, your compression will raise to 11:1. Depending on how much you shave your head you can get the 11:5:1 that you're looking for;). The bore size is 1mm or .040. Take care.

I'd advise against milling the head. Keep the factory clearances. If you mill the head you throw off the valve timing for all cams made for the sr20. You will need the adjustable cam sprockets to correct this. These are PITA sprockets because you have to remove the valve cover very time to make an adjustment.

11:1, are you running high octane gas, 94+? SR20's are not open deck Honda motors. They (Honda open decks)can run 11.5:1 no problem due to the coolant jackets surrounding the cylinder walls. SR20's are closed deck.

I'm not an expert, maybe PM Andreas Miko. He'll answer your questions correctly.

Thanks for the info scmser Ill stick to 11:1 and not shave the head.

its true i don't **** be playing with sprockets all the time to find the correct timming.



and thanks Jorge im taking my motor out and rebuiling it and gona make a few things to it :cool: ill call you so you come sometimes and help out since im planing on having it out for about 2months...maybe less or more but it all depends on the money because I think im going to make the whole motor.

port & polish, pistons,cams,sprockets,pullys,ect ect.

call me when you can or ill call you to talk n stuff. later.

So are you saying that there are no aftermarket pistons for the SR20DE to raise the compression? I'd rather not do a whole lot of work on the block to get pistons from another engine to work.

That's one thing I hate about the SR20DE fitted to the Pulsar. With only 9.5:1 compression, you're pretty limited as an all motor engine.

The 300z NA pistons require a 1mm overbore on the block and perhaps a slight shaving of the top of the rods. Port and polish the head, buy some C1 cams and valve spring/retainers, an O2 induction manifold, and maybe a 2000 crank. Attach a clutchmasters flywheel, some lightweight wheels and a little weight reduction, your set. You may need a JWT ECU to prevent detonation. The 2000 crank is very light, maybe some DET valves. They are larger, exhaust side. Try some Swains coatings on the pistons and manifolds. There are many options.

They (Honda open decks)can run 11.5:1 no problem due to the coolant jackets surrounding the cylinder walls. SR20's are closed deck.

Block deck design has no bearing on coolant routing. You can bet your bottom dollar the SR20 has coolant circulating between the cylinder liners.

Block deck design has much to do with strength. Closed-deck blocks are inherently stronger than open-deck designs.

How much compression an engine can tolerate depends upon combustion chamber and piston design, head gasket and head bolt strength.

Originally posted by Sunder
So are you saying that there are no aftermarket pistons for the SR20DE to raise the compression? I'd rather not do a whole lot of work on the block to get pistons from another engine to work.

That's one thing I hate about the SR20DE fitted to the Pulsar. With only 9.5:1 compression, you're pretty limited as an all motor engine.
Toda make hi compression pistons for the DET and Tomei makes them for both DE and the DET
the DE is still widely used and modified in Japan and there are lots of tuners that make internals for it.
http://www.todaracing.com/Nissan.html
http://www.tomei-p.co.jp/webcatalog/piston5.html