increase compression on 4g93

[slipar]

using 4g93NA in my wira..:slug:
will change block in near time..
so planning to do some mod along with the block changing..
heard that increase the compression will do some difference..

so the main question is:
- is it worth it for my daily driven street use only car..
- pro & con to do this mod..
- any suggestion on what piston to use & also part that must be use along with the suggested piston..
- or any other related info that i must know about this..
thanx in advance for all ur info & suggestion..

* will install at my friend workshop so will source the part by my own..

 

[SkYwAlKeR]

- is it worth it for my daily driven street use only car..
yes... increased compression allows better throttle response... good for street driven cars....

- pro & con to do this mod..
pros... increased throttle response and pickup...
cons... vulnerable to pinging and knocking... must use ron97 fuel above... CANNOT turbocharged/surpercharged....

- any suggestion on what piston to use & also part that must be use along with the suggested piston..
first step, skim ur cylinder head lor... unless u loaded enough to invest in high compression pistons...

- or any other related info that i must know about this..
i also dunno...

 

[slipar]

- pro & con to do this mod..
pros... increased throttle response and pickup...
cons... vulnerable to pinging and knocking... must use ron97 fuel above... CANNOT turbocharged/surpercharged....

- any suggestion on what piston to use & also part that must be use along with the suggested piston..
first step, skim ur cylinder head lor... unless u loaded enough to invest in high compression pistons...

thanx ya bro skywalker..
will play NA so no need force induction at this time..:slug:
let say dont want to skim cylinder head..
using higher comp piston such mivec, maybe type r piston or any brand high compress piston so no need skim cylinder head right..
if using high compress piston other part needed??
some say need stronger conrod..
how bout head gasket..
is there a way to tackle this knocking prob other than using ron97 above fuel..

 

[TermiziYeoh]

Owh, changing to thinner metal gasket helps too :)

 

[slipar]

Owh, changing to thinner metal gasket helps too :)

how many mm..
doing this as DIY with my friend..
"saya budak baru belajar"
so need the exact size..
thanx also bro..

 

[GT_AUTO]

o.4-0.5mm should be enough.since u at it,PnP ur head.save time n money.

 

[slipar]

o.4-0.5mm should be enough.since u at it,PnP ur head.save time n money.

if put in high compress piston do 0.4-0.5mm head gasket can do the job..
or need other thickness..
head already PnP..
but got oil leak at exhaust gasket..
maybe valve seal torn alr..
will concentrate mod to cylinder block 1st..
coz not so often got to open the block internal..
heheh..
head will do other time..

 

[GT_AUTO]

if u already install hi-comp piston,try n use back the oem gasket.too hi of compression
might spell trouble...hehehe

 

[fstr]

put mivec piston can liow maa, piston higher, high comp d wat

 

[slipar]

if u already install hi-comp piston,try n use back the oem gasket.too hi of compression
might spell trouble...hehehe

u mean that higher compression piston no need to use thinner metal gasket..
like that ka bro??
problem such as??
want to know more bout this..
dont want to regret later..

 

[slipar]

put mivec piston can liow maa, piston higher, high comp d wat

planning also like that la sifu..
want to know what other part needed for this mod..
don't want to install then problem occured don know how to solve..
later cry day & night cos canot go work cos car cant run..

 

[GT_AUTO]

u mean that higher compression piston no need to use thinner metal gasket..
like that ka bro??
problem such as??
want to know more bout this..
dont want to regret later..

such as water n engine temp problem la.piston n valve clearance lar....

 

[SkYwAlKeR]

put mivec piston can liow maa, piston higher, high comp d wat

unker, mivec piston same bore size with 4g93 piston??....

 

[joe_mirage]

yes .. mivec n 93 share the same size of piston. the different is only in design.

 

[fstr]

no water temp probs when i was on 93p with mivec piston maa :hmmmm:

 

[joe_mirage]

so fred .. last time u use how many mm metal gasket for ur 93 with mivec piston?
thanx

 

[GT_AUTO]

no water temp probs when i was on 93p with mivec piston maa :hmmmm:

what i mean is adding the piston with a thinner gasket fred.not the piston alone.
somore ur expert in this type of engine,sure u done the necessary up grade d
before replacing the piston...hehehebtw,i say it might be not for sure.

 

[fstr]

i use 1.5 mm metal gasket wor :hmmmm:

 

[GT_AUTO]

there,u said it urself.u use 1.5mm to compensate the high compression.what i'm afraid is
high comp piston with 0.5mm gasket.meaning the compression will be higher then ur's fred.

 

[fstr]

there,u said it urself.u use 1.5mm to compensate the high compression.what i'm afraid is
high comp piston with 0.5mm gasket.meaning the compression will be higher then ur's fred.

i know wat u meant laa taikor gt dont worry

u are just worried, u meant good