B16A Engine HEad VS B18CR Head

[HanJackaL]

Hey Guys,
I am a newbie in car modifications so i just need you "sifus" out there to clarify one thing for me, if thats possible =)

Firstly, i am not too sure about Engine heads and blocks,so dont flame a newbie like me please =D. But i was wondering, if i use my B16A engine head, but change the cams to Wide profile Toda cams,change my valve springs and retainers..etc, will my B16A head be better than the B18CR head?

If thats the case,then what reason do i have to change my B16A head to the B18CR head ?

Or do i need the B18CR head to fit the widest profile cams and such ?

Please advice and explain.
Thanks !

 

[Oderf]

hmmmm......first of all B16A and B18CR r similar in a lot of ways...but the valve angles are totally different...n so the valve, valve spring, retainers...etc....a complete done up B16A head (pnp and multiple angle valve job) are suitable to take even the wildest cam for Bseries...of coz with other upgrade to support it (intake manifold n the block assembly balance n blueprinted)...... hmmm.... correct me if i'm wrong pls sifus...

 

[vtecR]

bro if u wan use B16A head its ok but u need to do port n polish n valve seat job ..the different between
B16A n B18CR only its valve angle,better portflow n diameter intake n exhaust hole..But if u user B18CR head also its better to port also..So its not necessary to change ..
and want more thing pls dont skim ur head(potong) to make higher compression.Cuz this it cheap way to make high compression n bring lot a prob to modified other thing later..
For B16a u need to use B16B pistons to make 11:1 compression.(dont use b18c R piston in B16A cuz the compression to high and not safe for daily driving on street)
When after u do ur head job then u must look for piggyback or VAFC to tune ur ecu,upgrade ur fuel air n fuel delivery system,good xtractor n piping..etc..
by the way ur head its B16A SiR(92above) or GSR (88-91) VTEC?

 

[HanJackaL]

Thanks for the reply guys. B20B Block has the highest compression pistons right ? So if i use my B16A head, after doing porting and valve seating, its as good as a B18CR ?

 

[hattech-v]

it almost as good as 18cr i think...

 

[Oderf]

the original B20B pistons are low compression.... people use aftermarket high compression pistons when using B20B block with B16A head... or otherwise less power lo.... n u get better torque than B18CR with 2 litr i guess....

 

[itrDb8]

the original B20B pistons are low compression.... people use aftermarket high compression pistons when using B20B block with B16A head... or otherwise less power lo.... n u get better torque than B18CR with 2 litr i guess....

Hi, may I know what is the size of original piston for B20B block? isit 84mm?

 

[basahboy]

bro if u wan use B16A head its ok but u need to do port n polish n valve seat job ..the different between
B16A n B18CR only its valve angle,better portflow n diameter intake n exhaust hole..But if u user B18CR head also its better to port also..So its not necessary to change ..
and want more thing pls dont skim ur head(potong) to make higher compression.Cuz this it cheap way to make high compression n bring lot a prob to modified other thing later..
For B16a u need to use B16B pistons to make 11:1 compression.(dont use b18c R piston in B16A cuz the compression to high and not safe for daily driving on street)
When after u do ur head job then u must look for piggyback or VAFC to tune ur ecu,upgrade ur fuel air n fuel delivery system,good xtractor n piping..etc..
by the way ur head its B16A SiR(92above) or GSR (88-91) VTEC?

Bro..skimming your head meaning reducing the thickness of the gaskett from 3 layers to 2 layers or your meant skinning the piston dome???

 

[phantomCL7R]

guys...wud there b a problem if i want to use B16B piston in a small Vtec engine??

n wat wud b the compression ratio aa?? coz there's no point in dropping in a buddyclub

stage 5 cams if the compression ratio is not enuff...loose power loh...:frown:

 

[Oderf]

Hi, may I know what is the size of original piston for B20B block? isit 84mm?

sorry i'm not too sure bout the size... still i think it's 84mm..... i heard that there are 85mm and 86mm (max) piston size that can be used with B20B block, sifus pls correct me if i'm wrong...

 

[itrDb8]

Bro..skimming your head meaning reducing the thickness of the gaskett from 3 layers to 2 layers or your meant skinning the piston dome???

Using 2 layers gaskett, will make the car more high compression?
How about potong the head and with 2 layers gaskett?
Thanks!

 

[hattech-v]

2L block can use 86mm piston. its using k20a piston.

 

[hattech-v]

Using 2 layers gaskett, will make the car more high compression?
How about potong the head and with 2 layers gaskett?
Thanks!

yes it shud. reducing the thick of the gasket will increase the compression. such as using aftermarket head gasket like mugen n spoon...

 

[itrDb8]

2L block can use 86mm piston. its using k20a piston.

so for your experience, which one is more reliable? I mean if for daily use.

 

[itrDb8]

yes it shud. reducing the thick of the gasket will increase the compression. such as using aftermarket head gasket like mugen n spoon...

oh i see... thanks..
can anyone help about this --> http://www.zerotohundred.com/newforums/showthread.php?t=55960

 

[hattech-v]

i'm not sure how reliable 86mm piston in 2L.. but one of forummer here still running the engine quite well.. wait till i got news fr him when his engine blew... hehe
but i think if using standard 2L piston shud be more reliable. anything in standard will.

 

[HanafyEG]

ya lor..86mm pistons makes the b20 block cylinder wall to thin oledy like keropok..hehehe..max for me is still 85mm..that is more than enough and reliability is there

 

[itrDb8]

i'm not sure how reliable 86mm piston in 2L.. but one of forummer here still running the engine quite well.. wait till i got news fr him when his engine blew... hehe
but i think if using standard 2L piston shud be more reliable. anything in standard will.

ic... thanks!
I asked about this is because last time when I was using b18c3 engine, after I changed my car from auto to manual, then the next week my engine blew. :frown:
now I use b20b for my car, so I am quite worry about it.
How to well maintain our car? can share?

 

[HanafyEG]

if stock b20b no mod at all..just plunk like that..then it should be ok coz stock b20b 84mm pistons is low com and the block cylinder wall is still thick..no need to panic..just service as usual, for me i service every 3000km..depends on u la..

 

[itrDb8]

if stock b20b no mod at all..just plunk like that..then it should be ok coz stock b20b 84mm pistons is low com and the block cylinder wall is still thick..no need to panic..just service as usual, for me i service every 3000km..depends on u la..

ok.. get what you mean.. thanks!