razo007

hye... i wanna ask to all sifu2... 4g13 blok engine... what maximum oversize piston that can fit into 4g13 blok and still safe?? and how much that 4g13 blok can be robore??

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gud question....any members that know pls give answer.....................

wira4g13p

u can put in sleeve...then find 2nd hand piston or bigger.
..i did mine...used it for long distance travel. Millage 120000km...no problem. Do it at kota bharu

---------- Post added at 12:00 PM ---------- 6 hour anti-bump limit - Previous post was at 09:00 AM ----------

sleeve cost about rm400. Done at engineering shop...piston 2nd hand rm200..

DanzEterna

dont bore your block exceeding 2mm from your original pistons.

D7zul

i'd say 2mm for race purposes

1.5mm for weekend cars

& 1mm for daily driving..

the problem is not with the block u bore.. it's the leaking of head gasket.. even with metal head gasket

Gudluck

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^pomen_GTR^

better go for 4g15 block....

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razo007

i've heard people put in 74mm piston.. taken from mitsubishi lancer colt.. is it still safe or not?? n 73mm piston.. what car use that size of piston...

p/s: sorry.. i think i don't want to hear any suggestion of changing to block 1.5... now i want to try tweaking 4g13 original block and see how much it can get...

^pomen_GTR^

well if thats the case.. just follow the 2mm oversized piston value limit....

and the rest proceed to powerzone for their full engine build (balanced and fully blue-printed engine) if not mistaken the engine making around 140hp with healthy street-driveability torque

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S16

4g13 owner here... currently on 74mm pistons, if not mistaken those are 4g12 over-sized pistons. ... U can bore it safely up to 74mm. Better pick up than a stock setup. But if u aren't in tight budget, go for 4g15 block with 78mm piston. You will never regret as that gonna be my future project.

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crazykatak

there is no replacement for displacement