2.0L b18cR, do I need to bore the cylinder head to match sleeve bore?
10-02-2003, 12:42 PM
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2.0L b18cR, do I need to bore the cylinder head to match sleeve bore?
I hace a b18cR block with darton sleeves that has a 85mm bore. Do I have to bore the cylinder head out to match the block? Or can I leave it with the stock bore on the head? What are the pros and cons>
10-02-2003, 04:02 PM
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Re: 2.0L b18cR, do I need to bore the cylinder head to match sleeve bore? (Desperado)
I did just to keep the quench area as close to the size of the bore as possible. I'm not sure of exact pros and cons but I'm pretty sure it should enhance at least some flow characteristics. Hopefully some of the big head guys will chime in on this one to help you out.
10-02-2003, 07:12 PM
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Re: 2.0L b18cR, do I need to bore the cylinder head to match sleeve bore? (Desperado)
I read about it going both ways, but I'm not qualified to comment on pros or cons.
Bump for the experts to see.
Bump for the experts to see.
10-03-2003, 07:13 AM
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Re: 2.0L b18cR, do I need to bore the cylinder head to match sleeve bore? (Redlineracer)
10-03-2003, 11:11 AM
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Re: 2.0L b18cR, do I need to bore the cylinder head to match sleeve bore? (Desperado)
it mainly depends on the pistons you are installing. the 85 mm bore will not matter, but the shape of the piston will. if you are using an 85 mm piston with an 81 mm chamber, one of two things has to happen.
1. you need to run a flat/dish piston that will not extend beyond the top of the deck on the upward stroke or else you will smash it against the head surface. if you are going boosted then that shouldn't be a problem.
2. Or if you are running N/A and want the compression... then you will need a piston that is at least flat for the difference of about 2mm radius, then domed inside of that. this way the domed section of the piston is only 81mm and will fit nicely into the combustion chamber.
Option 2 is what I have.... it was part of the short block package. I would say send the head out and have the chambers done up to fit the 85mm bore and then have anything else done to the head that might need fixing/upgrading. This way you can maximize the output of the mods done to the bottom end.
Good luck.
1. you need to run a flat/dish piston that will not extend beyond the top of the deck on the upward stroke or else you will smash it against the head surface. if you are going boosted then that shouldn't be a problem.
2. Or if you are running N/A and want the compression... then you will need a piston that is at least flat for the difference of about 2mm radius, then domed inside of that. this way the domed section of the piston is only 81mm and will fit nicely into the combustion chamber.
Option 2 is what I have.... it was part of the short block package. I would say send the head out and have the chambers done up to fit the 85mm bore and then have anything else done to the head that might need fixing/upgrading. This way you can maximize the output of the mods done to the bottom end.
Good luck.
10-04-2003, 09:07 AM
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Re: 2.0L b18cR, do I need to bore the cylinder head to match sleeve bore? (Shft@9GSR)
see also portflow who says overbores or even crvtec with b16a head that there is no need to match bottom of combustion chamber size to top of cylinder bore
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