B18C Rebuild advice


Civicfacelift

ej9 and eg6
Joined
Jan 15, 2011
Messages
604
Hi all,

I've picked up a JDM B18C and want to do a factory refresh such as new timing belt/tensioner, oil/water pump, doing valve stem seals, valve guides, port & polish, head skim etc.

while I'm doing this I was planning on building the head with
skunk2 tuner cams (stage 1 or 2) with cam gears if stage 2
Skunk titanium retainers
skunk dual valve springs
skunk high comp valves
upgrade fuel pump and rdx 410cc injectors
Basically want to have a fresh engine with around 215bhp.

However I was advised by an engine builder not to change the cams and just rebore 81.25 and fit EK9/B16B O/S pistons to raise compression and should get similar power. I've done a lot of searching through old threads on this and else where but just looking for a second opinion on specs above. Thanks
 


JohnTurbo

Well-Known Member
Joined
Oct 3, 2013
Messages
940
Cams and an increase in compression need to go hand in hand to get the full effect.
215bhp from a skim and cams is a bit of an ask.

"high comp valves" are not worth it. I expect you'd be ok on stock valves with those cams too.
Titanium retainers are not needed unless you're trying to rev to the moon - get steel ones for 1/3rd of the price.

You would get there abouts with the EK9 pistons thrown into the mix. You'd have to overbore anyway. When I did this I need to go up to 81.5 (because of piston availability.
 


Civicfacelift

ej9 and eg6
Joined
Jan 15, 2011
Messages
604
Cams and an increase in compression need to go hand in hand to get the full effect.
215bhp from a skim and cams is a bit of an ask.

"high comp valves" are not worth it. I expect you'd be ok on stock valves with those cams too.
Titanium retainers are not needed unless you're trying to rev to the moon - get steel ones for 1/3rd of the price.

You would get there abouts with the EK9 pistons thrown into the mix. You'd have to overbore anyway. When I did this I need to go up to 81.5 (because of piston availability.
Thanks for the reply.

I will be taking advice on boring out to 81.25. I'm going to go with wiesco pistons instead of PCT.
I can go with 11.7 or 12.5:1 CR. Is 11.7 enough compression for stage 2 or am I better to go with stage 1 cams. I dont really want to go much higher compression as the fuel here in Ireland is bad.
 


JohnTurbo

Well-Known Member
Joined
Oct 3, 2013
Messages
940
PCT pistons give ~12.5 IIRC CR in an B18C - because of the longer stroke. Just make sure you use the figures for the 18C not 16A/B.

I imagine 11.7 would be fine, but I'm not an expert on that. Is there any documentation relating to your chosen CAMS?

John
 


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