Nov 24, 2010, 6:48 am · #1
so no ca18/20dt Sad
Ca20e Build
Dec 1, 2010, 11:41 pm · #2
ca18det yes lol the thing i hate about s12's is you have to hybridize everythingggg argh! im just gonna switch to entire s13 suspension,subframe,crossmember and be done with lack of aftermarket support
Dec 2, 2010, 1:47 am · #3
nismo_200sx on 01:06:06 AM / 24-Nov-10update: bought a ca18det rebuilt with eagle rods and cp pistons turned crank t25 sr turbo 300zx downpipe flange setup to open sidepipe turbo back, setup a jdm sport fmic with hks ssqv limited edition, walbro fuel pump 255lph, oil cooler freddy, nrg steering wheel with hub, tons more stuff its already in the car just did a battery relocation, just need 200 bucks for an optima battery and some redline trans fluid engine oil and some gas im running it on a tuned blitz ecu for 91 octane
If I get that right, you are trying to use ca18 piston and rod in a ca20 block...
first, bore is different... the ca20 is overbored 1.5mm compared to the ca18 (84.5mm vs 83mm) if you got a special order for oversize piston, then you are good...
second, the stroke is also different 83.6mm vs 88mm...
if both blocks were the same height, you'd have to have rods 2.2mm shorter in the ca20, but... the ca20 block is taller than the ca18 block by more than 2.2mm... more like 10mm so the fact is that the ca20 rods are longer than the ca18 ones...
overall, you cannot use ca18 rods in a ca20 block... since the ca18 rod are shorter than the ca20 one, you'll end up with not enough compression to start the engine (I don't have the CC of the combustion chamber nor the difference in length of both rods, but using a baseline of 58cc, if you use a rods that is 5mm shorter in the ca20 (and the difference is probably more between ca18 and ca20 rods) you'll end up with a compression ratio of ~5.75:1
Dec 2, 2010, 2:08 am · #4
Ok, so that means you use the biggest turbo you can find. You'd never have problems overboosting then, haha. ( disregard the useless post).
Maybe I'll add something relevant
My take on it is if you were going to spend the cash for new intervals, maybe even forged pistons, why not do it for a more capable motor platform? Ka? Na sr then boost?
Dec 3, 2010, 12:50 am · #5
actually i bought a completely new engine set. ca18det with cp pistons eagle rods, no ca20 all my ca20/18et parts are for sale cheap cheap i just want them gone