What compression ratio will come out, if I put an ITR 11:1 cr piston in an B16A and GSR engine?

 

http://www.bojangs.com/calculator/

Hope this link still works. Let it load, then drag what parts you want to the right, use the FAQ if you have any questions. I always liked this calculator.

Good luck,


A.

 

nice programm, but I doubt it is right, CAUSE

B16A head and B16A block with ITR P7300 Pistons, 3 layer: 10.12 cr
B16A head and B18C block with ITR P7300 Pistons, 3 layer: 11.07cr

I know if I put ITR pistons in B161 Block, the piston will go over the head gasket about 00.15 (in B18C block it is not so), so it has to be MORE cr than in B18C Block. Somebody can get me?

I also doubt following:
B18C5 head and B18C block with ITR P7300 Pistons, 3 layer: 11.07cr
B18C head and B18C block with ITR P7300 Pistons, 3 layer: 11.33cr

hows that possible, the B18C head has more cfm combustion camber than B18C5, wth has it MORE cr? It has to be less IMO.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by austrian type-R &raquo;</TD></TR><TR><TD CLASS="quote">hows that possible, the B18C head has more cfm combustion camber than B18C5, wth has it MORE cr? It has to be less IMO. </TD></TR></TABLE>

B18C1 head has a different port shape, accounting for the difference in cfm, but the combustion chamber itself is smaller, yeilding higher CR with the same pistons.

I didn't know that P73 pistons had a taller crown than B16A pistons.

 

You can also try out the C-Speed calculator.

http://www.c-speedracing.com/h...c.php

 

ITR Pistons in a B16 will Yeild LESS compression as the B16 has a Shorter Stroke.

Look at the B16 Piston's Dome a Stock B16 Piston has a larger Dome than the B18c1 or even the C5 or even JDM B18c R.

If you take a B16a Piston and Place it into a B18c1 the Compression will be Greater than Stock B18c1
A ITR Piston in a B18c1 will yeild Higher Compression than in the B18c5.

This is Basic As for How much the compression is rasied or lowered I don't know Actual numbers
Take a B16b Piston for Instance. Stock Compression in the B16b is what? 10.6:1 10.8:1 ??But put that piston in the B18c anf you get somewhere around 12.1:1 ROUGHLY.
Take the B18c R piston ad Put it into the B16b and the Compression will be less than Stock B16b

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by austrian type-R &raquo;</TD></TR><TR><TD CLASS="quote">nice programm, but I doubt it is right, CAUSE

B16A head and B16A block with ITR P7300 Pistons, 3 layer: 10.12 cr
B16A head and B18C block with ITR P7300 Pistons, 3 layer: 11.07cr

I know if I put ITR pistons in B161 Block, the piston will go over the head gasket about 00.15 (in B18C block it is not so), so it has to be MORE cr than in B18C Block. Somebody can get me? </TD></TR></TABLE>

Bojangs is right, C-speed is wrong.
And i dont know where you got your information about itr and b16a piston compression heights being that different but thats incorrect.

 

Well, I never saw it myself, but I just phoned with my tuner and I told him the same story and he went out in the garage and measured the pistons. And it is like I posted it. I just say what I have heard and he was measuring the pistons when I phoned with him.