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Do I need to clay my motor?
Posted:
Thu Oct 11, 2012 3:16 pmby kapow
Hey guys, I have
JDM B16 head
AUDM B18C2 block (oem crank and rods)
PR3 pistons with 1mm shaved off the top
Skunk2 Stage 1 cams
With the 1mm shaved off the PR3 pistons i'm hoping to get a similar compression ratio to a jdm ITR. I will be using the stock oem cam gears, so I won't be dialing it in. What would my compression be with this combo? Do you think I need to clay my motor? Any input I much appreciate it
Posted:
Thu Oct 11, 2012 5:31 pmby asianrob
http://www.zealautowerks.com/bseries.html
from when i did it with what you have posted it showed around 12:35.1
Posted:
Sat Oct 13, 2012 8:19 amby kapow
Thanks Rob!
Posted:
Sat Oct 13, 2012 4:13 pmby bks84
asianrob wrote:http://www.zealautowerks.com/bseries.html
from when i did it with what you have posted it showed around 12:35.1
i dont know what benefits there are from shaving the tops of a piston, but if he did then his compression wont be 12:1.
Posted:
Sat Oct 13, 2012 5:33 pmby kapow
bks84 wrote:asianrob wrote:http://www.zealautowerks.com/bseries.html
from when i did it with what you have posted it showed around 12:35.1
i dont know what benefits there are from shaving the tops of a piston, but if he did then his compression wont be 12:1.
My engine builder thinks 11.5:1 is a bit high for my local gas, shaving 1mm off will get it to 11.3:1 - 11.2:1
Posted:
Sat Oct 13, 2012 6:15 pmby bks84
Friend of mine ran 12:1 built motor on 91 pump, I'm running 12.5:1 on E85, my old motor was 11.5:1 on pump. It all depends on what your octane level is and how competent your tuner is.
Posted:
Sun Oct 14, 2012 3:54 amby juls1488
if you want, you could take a look at the P73 pistons. theres two versions P73-A0(USDM B18C5 ITR) and P73-00(JDM B18C5 from ITR). less dome, but slightly higher compression hieght. and then depending on your headgasket thickness, you could get in your target comp ratio range without milling pistons.
just a thought!
Posted:
Sun Oct 14, 2012 12:28 pmby kapow
juls1488 wrote:if you want, you could take a look at the P73 pistons. theres two versions P73-A0(USDM B18C5 ITR) and P73-00(JDM B18C5 from ITR). less dome, but slightly higher compression hieght. and then depending on your headgasket thickness, you could get in your target comp ratio range without milling pistons.
just a thought!
I actually couldn't find any jdm itr pistons anywhere, so had to settle for pr3. Close enough. But everything is all balanced, trying to build a similar engine to Spoons B18C