4 replies to this topic

[BenAngWJ]

Hi all,

 

Looking to increase CR on my mirage. Currently on SOHC 4G92 head & 4G93 block with Toyota 4AG-ZE low compression pistons. Previous owner's plan was to turbo the car but dint get around to do it. I would like to keep it as NA and planning to bring CR to 10.5/11:1, RON 97 with Unichip piggyback. 

 

1 - Will I be able to fit in 4G92 Mivec pistons to my 4G93 block with ease? Will the pistons be able to clear and not knock into the valves? 

2 - Will I have to skim the block?

3 - What thickness of gasket to use?

4 - How about timing belt? 

 

Thanks 

Ben

[EVL20T]

7jkh b8n huh dq f2f gjggc5u

[bj]

I think the piston pin is a different size.

[leadfoot]

if you want a higher comp run STD sohc pistons if you want even higher use the 4g92 mivec piston they do sit proud of the block so no skimming needed mivec pistons are made for 11:1 compression. tbh i'd get some flat top piston from 4agze to bring the compression up to the 9:1 area using the same rods you have now

the timing belt you use if your replacing it is a 1jz timing belt i beleive it's 159yu29 (7mgte 159 tooth 25mm wide) or if you can 159 tooth 29mm wide

[CLuTZ]

Personally, I wouldn't bother- just chuck it on the bottle!! (Nos)