r34 gtr wrote:i've put way too much money in my car. i'll never get it back, so i can't sell it. it's a vicious cycle.
You are kidding right? 4G63 parts in a CA18 or CA20 block? And none of you guys said anything? Ryan, I'm shocked at you for letting this go unmolested. I disappear for a minute and this is what I come back to . Dude, you ain't puttin' no 4G63 rods and pistons in no CA block, so don't even think about it. And furthermore, why would you? The CA has heavy duty aftermarket parts that will exceed the strength of the 4G63's aftermarket parts as well.fraz wrote:I eventually want to run a ca18det crank as they are stronger than ca20 ones. Then i will fit aftermarket 4g63 rods and forged pistons.Compression is around 10:1 so i figure this motor will take about 6-10psi with a well tuned aftermarket ecu, hopefully a wold 3d depending on funds
It all comes down to money. In new zealand, mitsi 4g63's are common. We got all the evolution models in pretty high numbers, and before that, we got vr4 galant turbos from about 88 onwards.The rods fit the crank, just have to shave the sides of the bearings a little to bring the width of the big end down.boost_boy wrote: You are kidding right? 4G63 parts in a CA18 or CA20 block? And none of you guys said anything? Ryan, I'm shocked at you for letting this go unmolested. I disappear for a minute and this is what I come back to . Dude, you ain't puttin' no 4G63 rods and pistons in no CA block, so don't even think about it. And furthermore, why would you? The CA has heavy duty aftermarket parts that will exceed the strength of the 4G63's aftermarket parts as well.
Dee
I currently have honda pistons which have been turned down to 84.5mm. They are 11:1 originally so i figured that they would be able to handle the boost i want to run, but i dont think that they will be suitable. I guess i will find out when i give it deathXracer wrote:you definatly seem to be getting stuff extremely cheap.are teh 4G63 pistions even the same bore as the CA20 block? this will be interesting when its done
Fraz dont know if you are still around but those figures dont look right for the 4g63 having so much comp? cant seem to get these pistons with + 16cclfraz wrote:I currently have honda pistons which have been turned down to 84.5mm. They are 11:1 originally so i figured that they would be able to handle the boost i want to run, but i dont think that they will be suitable. I guess i will find out when i give it deathXracer wrote:you definatly seem to be getting stuff extremely cheap.are teh 4G63 pistions even the same bore as the CA20 block? this will be interesting when its done
4g63 pistons are 85mm and so are vq25de pistons so i might look at getting some of them. The trouble is, you cant really bore the CA block much over 84.5mm. I would go to 85 but i have heard of a few people blowing the gasket between cylinders at high rpms and/or high boost
The piston crowns are:ca18de is +7.45ccca18det -.19cc (dished)early 4g63 +14ccpost 94/95 4g63 +16ccI think the vq25 ones are +5
Im not too woried about the piston tops because i can shave a bit of meat out of the top of the block, i just want something that gives good flame propagation so i can achieve maximum power with the least air+fuel
I will be doing a bit more research in the next month, im a bit busy at work at the moment