Ok so I had my tuner supply me with 10:1 pistons for the turbo build but there is no info on the box label or spec sheet to identify the compression ratio. I called JE and was told they are 8.5. Just by looking at these I know that is bs lol. Then I googled the part number and get a few diff listings. 9.5, 10.5 and 11

Obviously I would like to for sure know the CR of my engine before stuffing a **** ton of boost down its throat.

My setup is a B18a bored to 84mm with a b16 head. ANY HELP WOULD BE GREATLY APPREICIATED! Trying to get a awnser from JE is not going well

JE Part # is 185919 for b16a1/a2/a3 here is a pic of the actual pistons I recieved

 

http://www.summitracing.com/parts/jep-185919-1
Quick google search got me this

 

they will make different comps in different motors. google the part number and look at the chart for what block you are using


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yea I dont see a comp ratio anywhere tho

[QUOTE=teggy!;48688294]they will make different comps in different motors. google the part number and look at the chart for what block you are using


http://www.buyimportperformance.com/...1_p/185919.htm

http://www.raceeng.com/p-2280-je-hon...1b16-head.aspx

http://www.cnc-motorsports.com/pisto...-0mm-bore.html

Yea ive done that but that doesnt give me a solid awnser. Isnt a ls block the same as a b20 other than bore size? So my sleeved 84mm ls block should be the same as a ls block should it not?
Check the links, diff comp ratios for the same engines... I just dont know which to believe. I doubt these are the low comp ones tho. they look like they are in the 10.5-11 range but I just want to be 100% sure before installing

 

Compression height 1.181"
Dome volume +1.70cc
Using zealautowerks.com calculator I come up with 11.59:1, however without knowing your exact deck height and cylinder head cc, it will vary.

 

the b20 is the same as ls besides bore. but for some reason when I was searching I see that 84 mm is always higher comp than 81. that was with supertech pistons tho. maybe because the head isn't opened up to 84 mm


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