sleeved b16 with 85mm pistons over b18


ek4vti

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Jul 13, 2012
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hi
wondering which set up would be better for street use revving to 9k N/A
with the same head and compression ratio
 
Do it! Short stroke 1800cc and rev it to 10k, even B18Cs can do 9k!
 
Safe to say it works, with promising amounts of torque/power. :nice:
 
If he's purely after a top end engine and cost isn't a concern then I agree with the above. There's nothing wrong with a 81.5mm NA B18c though. It's a lot more "cost effective" considering the price of sleeving.
 
The trouble with an 85x77mm build is getting it to breathe at the RPM it'll be capable of doing.
 
Yeah, I guess you could be right there. It's always down to funds...
 
Indeed. If you've got the dollar, the potential is there to have a B18 killer as you can make the same torque but with much higher RPM limits. Some B16s can go to what, 11k?

11,000rpm plus B18 torque would rock for a 1800 limited race engine! :win:
 
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Add a 4.9fd with the 1800 b16 and would be alot of fun
Ok so with the over square(correct me if I'm wrong) b16 with major head work I wouldn't have so much torque down low?? With the large ports etc
 
Yes it's more than likely going to lack down low power compared to a B18, once you've set it up to sing into 5 figure RPM.

As a road engine, it'll probably be a bit rubbish.
 
So would anyone know the limit of the type R head with the standard valves in terms of top end power
Also with the itr cams?
What is the most restrictive on these heads? Ports or valves?
 
So would anyone know the limit of the type R head with the standard valves in terms of top end power
Also with the itr cams?
What is the most restrictive on these heads? Ports or valves?

Stock b16 head flows close to 270-280 cfm so you dont need to worry about things like that unless you are trying to squeeze every last hp you can, you will see better gains from cams and a inlet manifold with a large volume and the correct runner length for the rpms to intend to turn to. Be carefull with an 85mm bore, it does not leave a great deal of room for error as the sleeves start to get very thin. Have a little look at my set up, I have a boosted set up but the parts are in place for 11,000+ rpm. As long as you can keep the torque curve rising of flat it will make power, remember revs x torque = hp.
 
haha, your gonna' love it mate. :secret: Was dyno'd at TDI north with 186lbft on stnd cams :p
 
my built b18c with 81.5 pistons is revving to 9100 think it is

with which cams and any head work?
you got a dyno graph up any where please

im in the middle of a b18 rebuild with pctx 81.5mm pistons
if all goes well will have a jdm itr head next week
 
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my old b18 was revving to 9600, haha

mild headwork, endyn cams (now discontinued, but basically improved Jun 3's), custom made exhaust and inlet manifolds

made 245bhp and you could almost draw the power "curve" with a ruler
 
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