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PostPosted: 31 Jan 2017 04:11 
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Joined: 06 Jun 2016 13:55
Posts: 1
Country: Singapore
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


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PostPosted: 31 Jan 2017 07:05 
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Joined: 05 Nov 2010 06:35
Posts: 203
Location: malaysia
Country: malaysia
BenAngWJ wrote:
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



hey man
1) yes can fit in mivec piston ,
2) no need , but it will good if do. just to make it level surface
3) 0.5mm will be nice
4) same as u have now.


im from johor bahru :D
u can whatsap me at +60197602644
we can talk about it

tq

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fast deal : whatsapp - +60197602644
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PostPosted: 03 Feb 2017 14:41 
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Joined: 04 Jul 2005 13:25
Posts: 1209
Location: Lower Hutt
Country: NZ
You don't want to go any higher than the factory CR.
These cars (mivec) are Japan spec only and are supposed to be run on 100 RON fuel.
Any higher CR it'll knock and you'll get less power , not more power.

_________________
6G72 mivec Twin TDO5 20Gs up and running.
6G72 mivec bored and stroked to 3.4 litres...Frankenmitsi build
6G74 mivec bored and stroked to 3.9 litres....Frankenmitsi build.
6G75 under construction....4.2 litres bored and stroked.Another Frankenmitsi.


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