ls block with pr3 piston question????

[jpangeles]

i have a 1990 ls integra block and have pr3 jdm piston? i want to use the pr3 piston in the block i just noticed that pr3 is 1.6 liter and ls integra is 1.8...do i need a oversized rings for this cituation or i can used the rings from the pr3?

 

[MikeBergy]

You can use the pr3 rings, since they are the same bore size. The stroke of the motor is what makes the motor 1.6 or 1.8 liters. Just realize you are bumping compression quite a bit. You also need to use the ls rods. Pr3 rods are too short.

 

[E_SolSi]

same bore (81mm)

the extra .2L is from the stroke

 

[E_SolSi]

doh!

he beat me to it

 

[jpangeles]

ohh thanks guys for ur help and ill be using the ls rods for my engine set up

 

[brian11to1]

your compression ratio will be around 10.9:1 or so...

you can use the LS rods...

 

[phunky.buddha]

Originally posted by SpodaB1@Jun 22 2004, 12:04 PM
your compression ratio will be around 10.9:1 or so...

you can use the LS rods...

More like 11.1, but it's close enough.

 

[brian11to1]

That all depends on the head gasket thickness and the head he uses...

Stock LS head w/
1 layer HG 11.69:1
2 layer HG 11.39:1
3 layer HG 11.10:1

B16/B17/ITR Head w/
1 layer HG 12.30:1
2 layer HG 11.96:1
3 layer HG 11.63:1

B18C head w/
1 layer HG 10.89:1
2 layer HG 11.18:1
3 layer HG 11.48:1

 

[jpangeles]

actually this set up is for ls/vtec...ls block with a gsr head....what do u mean 3 layer gasket? is that i have to put 3 gasket so i can race my compression to the higher one?

 

[brian11to1]

Originally posted by jpangeles@Jun 22 2004, 05:43 PM
actually this set up is for ls/vtec...ls block with a gsr head....what do u mean 3 layer gasket? is that i have to put 3 gasket so i can race my compression to the higher one?

Honda uses a 3 layer headgasket... you can change hte compression of a motor by putting a thinner head gasket in... such as a 2 or 1 layer.

Simply put the head gasket has 3 layers to it... a 2 layer has 2, a 1 layer has 1. When you get the head closer to the block it raises the compression, the further away from the block you are the high the compression.

 

[calligra]

I was looking at an LS/Vtec setup with those pistons I think you are around 11.6 : 1

that is with OEM gasket

B18 Block and B16 Head.

 

[brian11to1]

LS Block and Head w/PR3 pistons nets an 11.1:1 w/ 3 layer head gasket
LS block and B16 head w/PR3 pistons nets an 11.63:1 w/ 3 layer head gasket

http://www.c-speedracing.com/howto/compcalc/compcalc.php