ca20e pistons?
 

hi guys i have just pulled the head off my 12 and have found that it has pistons to sleeve 16 valvles,why? do theses come out standard in them or what? and why do they allow 16v's for are they the same as 18det pistons, im currently in the prosses of having the head folwed and have sourced some bigger inlet valvles from a bmw and then gonna pull the block down and so on.and im not looking for any excuses of doing any 18det transfers.

the Et pistons do have the four valve reliefs in the top but I remember Eddy from zxoc years ago comparing them to a DET piston. The tops were the same but the grooves etc were different

hey mate yeh its a bit of a weird one just trying to work things out gonna have the pistons dished,so i was just trying to work out if theyd be good enough so cheers for that info.
aaron

hey mate yeh its a bit of a weird one just trying to work things out gonna have the pistons dished,so i was just trying to work out if theyd be good enough so cheers for that info.
aaron

there not really good enough for much to be honest, If your going to have machining done and fit new rings obviously then there really is no reason not to upgrade the pistons to at least a det 16v rod/piston setup. There so cheap to buy

what lengths are the det there obviously shorter, but will they fit the 20?. i wanna keep it a 20 no matter what as i am all for being origanal and the laws here in aus are sh#3t! though i work for an engine builder that builds sprint cars and all sorts of things so putting this together will be fun.

8V pistons have 4 reliefs in the pistons for a very simple reason. It's so they can have one single casting of piston. Otherwise they would have to cast 2 pistons to match cylinders 1&3 and 2&4.

You'll notice the cutouts on an ET and DET are completely different

sorry, i thought you had a ca18et and were wondering if you had ca20's

ca20 engined s12s werent available in the Uk mate.

oh ok no worries yeh i might see how i go mabe get some after market slappers and mabey new rods i gotta finish all the head work yet anyway, our s12's are mostly only 20s some import 18's but very few here in aus is mostly the reason im signed up with uk silvia because the 20 and 18 bits are the same so ive sourced a couple of bits through here and much rather the different insight, you wouldnt happen to no anything about a body for it or can i customize an s series kit? and i really need a new rear lip as some bastad broke it!

Have you tried the Aus S12 site ? We only ever got the CA20E in FWD form and even then only on one specific model so very rare. :)

As far as i know, et and 20 pistons and rods are the same, the CA20 gets its extra capacity due to a longer stroke on the crank! hence, if someone ever wanted to build a serious ET or DET with a 2.0 capacity, use a CA20et crank!!! :D
Rare as rocking horse s**t to find and wicked expensive but the only job for some serious ponies!!!:cool: Norris designs supply a stroker kit with this crank off the shelf, but u need a big fat wallet!!!

CA18DET rods and pistons would still make your CA20 bottom end stronger if your trying to get as much power as possible from it and a cheap upgrade! i can sort you out with a set if your stuck mate!;)

BTW, Any chance of findn me a ca20 inlet manifold bud?!...

yeh we have millions in fwd, but im mostly after bits from the euro's because we only have crap over here, im using a fwd ca20 inlet manifold cut and re welded aswell as all of its ignition as its newer and has better sensor set up.

as far as im aware the Ca20 wasnt done as a turbo (et suffix) only N/A with e suffix. ive heard the cranks arent as tough as CA18ET cranks either (unusally tough for a OEM engine crank spec). wouldnt mind looking into buying a couple undamaged of Ca20 cranks if you can get them though and shipping them over?

Bren from Apex performance has had some custom 2litre cranks made for the DETs, but around £1200 each iirc they are also 8 stud fitting for the flywheel and need the DET oil pump & sump and youd need to have the bottom timing belt pulley modified to fit the larger DET crank nose diameter, but all do-able if ya doing a serious build

Or get an SR20DET for like £800......

yeh man ive actually thought about using the det gear but i got myself some 4g63 pistons and rods so im gonna have them ground to fit eventually,i have a manifold though i am i aus and it still on the car for now so if u really stuck i can send it.and i dont wanna change the engine as it is a good motor and is quoted that ill make 350- 400 horsepwr atw , so im fine wit that and it will be all factory looing wich is good over here!