I have been building a b18 for a while now and all i need to yet is a head gasket. I called a place that makes custom bore gaskets and when i told the guy that it 87mm bore and planning to get turboed he told me that 87 is to big for a turbo and if it was him he wouldn't do it because of such little gasket space...what do you guys think??
Should i sell my whole bottom end and get an 84 or will the 87 work?

 

87 is a one shot motor. no room to bore over. why would you ever go 87? most people run 84-85mm bore on big hp turbo setups. i've never really even heard of 87mm pistons, did you have them custom made?

 

This is my first build and i assumed bigger was better but i guess that's not always true..the pistons came with the block, i did have a hard time finding new rings though

 

To my knowledge, 87mm isn't even possible. The largest anyone really goes is 85mm...

 

I didn't know that was even possible. I thought the biggest was 85mm for boost and I think I remember seeing 86mm for allmotor. Pics?

 

ive done 86.5 but for all-motor and i thought that was rediculous after seeing guys making more power using smaller bore. I would sell that 87mm block to some noob allmotor guys looking to max out and get another sleeved block and keep it at 83mm...that's enough to make good power, even guys with 81mm makes 600+whp

 

I have a 84.5mm bore on my turbo motor, I was going to go 86mm but was advised against it for boost

 

I've seen/done 87mm.. That crap barely hold up to all motor, I don't think it'll hold up to boost .. Currenty I"m doing 86mm all motor with nitrous on top.. but I htink for turbo just stick with 84mm.. honestly unless your trying to make like 800HP 84MM is plently.. heck I've done 533 on 81MM on stock sleeves..

 

I've seen an 87mm all-motor setup, pretty crazy. Blew headgaskets all the time though.

 

Thanks, i'll try to sell it and get something around 84, thanks a lot for the help

 

i would go whit 83mm that way you can blow it up 1 or 2 times. then after that sell it to your allmotor Buddy

 

im supprised the few guys who are 87mm aren't oringing their blocks. i would go 84-85mm for sure.

 

here is a thought not a suggestion

if it was a race only block u could concrete it like v8 guys do
but obviously alcohol would be the suggestion for fuel, since it would have a heat issue with no coolant movement

just wanted to throw some info out there

87mm is to big in my opinion

d

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMorgan &raquo;</TD></TR><TR><TD CLASS="quote">im supprised the few guys who are 87mm aren't oringing their blocks. i would go 84-85mm for sure.</TD></TR></TABLE>

Theres not enough sleeve left between cylinders to o-ring a 87MM block..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nasteboyii &raquo;</TD></TR><TR><TD CLASS="quote">here is a thought not a suggestion

if it was a race only block u could concrete it like v8 guys do
but obviously alcohol would be the suggestion for fuel, since it would have a heat issue with no coolant movement

just wanted to throw some info out there

87mm is to big in my opinion

d</TD></TR></TABLE>

Concreting it does nothing when you don't have enough material between the bores to seal the head. Concreting keeps the BLOCK intact for some people when the block itself isn't strong enough. The sleeves at 87mm are fine, there is enough wall thickness there for them to not blow apart, it's the material in between the cylinders that poses a problem.

 

yea that makes sense but at same time i wouldnt think at 87mm u wouldnt have alot of sleeve left either (2 different problems) bottom line not good

thanks
d

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turboteg185 &raquo;</TD></TR><TR><TD CLASS="quote">This is my first build</TD></TR></TABLE>

Am I to assume that you have indeed resleeved the block? Even if you have, companies like Darton and GE don't recommend anything over 85mm for boost on their replacement sleeves.

As long as you don't get a grossly oversized turbo, you don't need a crapload of displacement. I'd surmise you'll be impressed with even 300whp on a 1.8L if you've never owned a boosted Honda. But at 2.1L? Just turn up the boost, thats a great replacement for displacement.

 

92 Accord LX, H/F Hybrid, H22 Top End, F22B1 bottom End Sleved 87.5mm, with custom CP Pistons. 530WHP.

My Roomate's Car

http://www.cb7tuner.com/vbb/showthread.php?t=71285
http://vids.myspace.com/index....85364

Hmmm..not enough power yet!

 

the machine shop who bored the block to 87mm should be ashamed......i would never run that or bring my stuff to that shop.

84-85mm max n/a or boost........

 

The darton sleeves for 87mm don't have o-rings/grooves in the bottom of the sleeves and depend on press fit and sealant to keep the coolant from getting into the crankcase.They are also on unequal bore centerlines typically.
I would also vote for using another block.