Here is the situation.

I have a B18C1 block, B18C1 crank, 2001 ITR Rods (USDM), 2001 ITR pistons (USDM - .25 over). I have the bottom end assembled and noticed that the piston deck height is very slightly out of the cylinders. When I put a straight edge ruler over the piston at TDC, the ruler is slightly raised up (you can barely feel it with your fingers). When I had the block worked on, the machinist very slightly decked the block to “even things up”.

Obviously, this is a concern. I was planning on using a stock B18C1 Honda head gasket. The piston is not up far enough to go above the head gasket, but I assume the rods will stretch slightly at high RPMs, so piston to head contact is a growing concern.

Should I be concerned? I searched around in the other deck height threads and there was some mention of a .000 clearance with CTR pistons. I also saw a few postings with people running positive (like mine) clearances, but no mention of the head gasket they were running.

Let me know. Thanks much.

-Tim

 

A lot of engines have the pistons rising out of the cylinder. Both Porsche and BMW do so I dont think it should be a major problem. But to be on the safe side why to you measure the valve to piston clearance while your building your motor. Dont forget to do it with vtec engaged.

 

If yor mech took .015 off your deck that probably wouldnt cause your pisons to rise out, find out how much he took offof the deck and if he took any off of the heads, if he took off enough compression will be really high.

Pretty sure you can get a thicker headgasket bu if your going all motor,the compression is gonna be a good thing anyways

 

I will check with the machinist on just how much he took off. It is an all-motor build, so compression is good for the project. However if I get over 12.0:1, things get interesting as the car is a daily driver. I was planning on only 11.0:1 - 11.5:1.

Any recommendations on a slightly thicker head gasket?

-Tim

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostn420 &raquo;</TD></TR><TR><TD CLASS="quote">A lot of engines have the pistons rising out of the cylinder. Both Porsche and BMW do so I dont think it should be a major problem. But to be on the safe side why to you measure the valve to piston clearance while your building your motor. Dont forget to do it with vtec engaged. </TD></TR></TABLE>

Good advice

 

I am planning on claying each cylinder just to make sure. I have high-lift cams (CTR), so I definitely need to measure things.

Any ideas on the head gasket? Is the stock one fine? Or..who makes a thicker one?

Thanks everyone for the input. I really appreciate it.

-Tim


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