84.5mm Head on 84mm Bore
#1
84.5mm Head on 84mm Bore
Can I safely run a head with 84.5mm chambers on an 84mm block? Im rebuilding my setup and picking up a ported head but it has enlarged chambers. I know its safe to run stock head chambers on larger bore but what about the other way around?
#2
Re: 84.5mm Head on 84mm Bore
i would say it might have some sealing issues with the head gasket. im not a hundred percent sure on that but on smaller chambers/larger bore none of the head gasket would be exposed since the head gasket is made to fit around the cylinder but on one with larger chamber/smaller bore some of the head gasket would be exposed in the actual chamber which could lead to problems.
#5
Re: 84.5mm Head on 84mm Bore
Thanks Saxon. I would tend to agree, especially since the diffrence is so small. Its not like Im putting it on an 81mm bore. ha
Im debating if I should just bore it to 84.5mm and go with high comp pistons anyways. Im thinking 11.5:1 on E85 should be doable. Im looking to push deep 500s next year.
Are used pistons even worth anything to sell? I have swaintech coated CP 84mm 9:1 pistons now. Otherwise I'll just reuse them but Id like to match the bore to the head AND go with higher compression. What do you think?
Im debating if I should just bore it to 84.5mm and go with high comp pistons anyways. Im thinking 11.5:1 on E85 should be doable. Im looking to push deep 500s next year.
Are used pistons even worth anything to sell? I have swaintech coated CP 84mm 9:1 pistons now. Otherwise I'll just reuse them but Id like to match the bore to the head AND go with higher compression. What do you think?
#6
B*a*n*n*e*d
Join Date: Jul 2010
Location: Earldasquirrel
Posts: 776
Likes: 0
Received 0 Likes
on
0 Posts
Re: 84.5mm Head on 84mm Bore
if you have the cash flow i would go 12:1 and sell the old
they probably arent worth a whole lot, but if there isnt much wear on the skirts im sure someone will buy them for a cheap b20 build
they probably arent worth a whole lot, but if there isnt much wear on the skirts im sure someone will buy them for a cheap b20 build
#7
Re: 84.5mm Head on 84mm Bore
Saxon, sold the old pistons for half price. Now looking at high compression pistons. Compression will be about 11.6 with the Wiseco 84.5mm 8.25cc dome piston. Should I copper O-ring the block or can I get by a standard head gasket?
Thread
Thread Starter
Forum
Replies
Last Post
MigsD16
Engine Machining & Assembly
8
12-17-2016 05:17 PM
boostedel
Forced Induction
10
04-06-2003 09:11 AM