Sleeving B18C1 block to 84mm... Required to match port the head chamber????
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Sleeving B18C1 block to 84mm... Required to match port the head chamber????
Sup all, I am planning on sleeving my B18C1 block to 84mm bore and I heard from a friend of mine that in order to do that, I will need to match port the chambers of the cylinder head so that I have less chance of detonation???? I'm confused now, I thought I can keep the GSR head stock w/ upgraded springs and retainers???? Please I need your input on this before I get my block sleeved. Also, I need to know if its the same with b16a? Thank you very much!
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Re: Sleeving B18C1 block to 84mm... Required to match port the head chamber???? (B18C1-Turbo)
You can retain your stock head on that bore. We have a few cars using stock head on 84.5mm runnin 12s all motor
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Re: Sleeving B18C1 block to 84mm... Required to match port the head chamber???? (TURBO4drTypeR)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TURBO4drTypeR »</TD></TR><TR><TD CLASS="quote">You can retain your stock head on that bore. We have a few cars using stock head on 84.5mm runnin 12s all motor </TD></TR></TABLE>
Thanks for your input Anybody else have this setup w/ turbo???
Thanks for your input Anybody else have this setup w/ turbo???
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Re: Sleeving B18C1 block to 84mm... Required to match port the head chamber???? (B18C1-Turbo)
Spot-Facing the head will lower the compression...I know on a GSR Head, your going to be in the 43-44cc Range. I don't find this necessary on a FI Buildup.
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Re: Sleeving B18C1 block to 84mm... Required to match port the head chamber???? (Suprdave)
What he says
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Suprdave »</TD></TR><TR><TD CLASS="quote">Spot-Facing the head will lower the compression...I know on a GSR Head, your going to be in the 43-44cc Range. I don't find this necessary on a FI Buildup.</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Suprdave »</TD></TR><TR><TD CLASS="quote">Spot-Facing the head will lower the compression...I know on a GSR Head, your going to be in the 43-44cc Range. I don't find this necessary on a FI Buildup.</TD></TR></TABLE>
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Re: Sleeving B18C1 block to 84mm... Required to match port the head chamber???? (TURBO4drTypeR)
Yup. It's one of those don't-have-to-but-you-can things.
I did on mine. I wanted lower compression.
I did on mine. I wanted lower compression.
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Re: Sleeving B18C1 block to 84mm... Required to match port the head chamber???? (MarkC)
so if I bore my b16 to 83mm, I don't have to port match the combustion chamber
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Re: Sleeving B18C1 block to 84mm... Required to match port the head chamber???? (hookonboost)
I actually like having the cylinder a little larger than the chamber. I would suppose that some would disagree with me. I do think a little deshrouding around the valve is helpful however.
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Re: Sleeving B18C1 block to 84mm... Required to match port the head chamber???? (earl)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by earl »</TD></TR><TR><TD CLASS="quote">I actually like having the cylinder a little larger than the chamber. I would suppose that some would disagree with me. I do think a little deshrouding around the valve is helpful however.</TD></TR></TABLE>
That and it might even improve flame travel.
That and it might even improve flame travel.
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Re: Sleeving B18C1 block to 84mm... Required to match port the head chamber???? (B18C1-Turbo)
Didn't need it done but the guys that did my headwork did it for me anyway. Got my head p & p'd, new valve seats, new o/s valves installed, new bronze guides, hondata IM gasket and chambers matched to the cylinders for $900 so I didn't argue. I guess it all depends on personal preference
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Re: Sleeving B18C1 block to 84mm... Required to match port the head chamber???? (earl)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by earl »</TD></TR><TR><TD CLASS="quote">I actually like having the cylinder a little larger than the chamber. I would suppose that some would disagree with me. I do think a little deshrouding around the valve is helpful however.</TD></TR></TABLE>
This is what Endyn did to my head for my larger bore D series.
This is what Endyn did to my head for my larger bore D series.
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Re: Sleeving B18C1 block to 84mm... Required to match port the head chamber???? (hookonboost)
It really depends your compression ratio and what you want. Matching the head will lower your compression ratio. I make 362hp @ the wheels on a stock unmodified head on 9:1 compression ratio. Also take into consideration if the pistons you are using are for a b18c or b16a because there is a difference. Swapping a b16a head from a b18c head will drop compression by about .2 making 9:1 pistons 8.8:1. Make sure if you sleeve the block to 84mm to get 84.5mm pistons so you can have a machine shop match them to your cylinders and you can get a proper seal. Everyone's tolerances for measurement are different and your pistons might be 83.97mm-84.04mm for example. Also make sure you get a head gasket that's 84.5mm or 85. It's ok to be a little too big but not too small.
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Re: Sleeving B18C1 block to 84mm... Required to match port the head chamber???? (jdm_boost)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdm_boost »</TD></TR><TR><TD CLASS="quote">It really depends your compression ratio and what you want. Matching the head will lower your compression ratio. I make 362hp @ the wheels on a stock unmodified head on 9:1 compression ratio. Also take into consideration if the pistons you are using are for a b18c or b16a because there is a difference. Swapping a b16a head from a b18c head will drop compression by about .2 making 9:1 pistons 8.8:1. Make sure if you sleeve the block to 84mm to get 84.5mm pistons so you can have a machine shop match them to your cylinders and you can get a proper seal. Everyone's tolerances for measurement are different and your pistons might be 83.97mm-84.04mm for example. Also make sure you get a head gasket that's 84.5mm or 85. It's ok to be a little too big but not too small.</TD></TR></TABLE>
Very good info Thank you everyone!!! I appreciate it!!
Very good info Thank you everyone!!! I appreciate it!!
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