Hey guys I'm about to order my ECU, however before I do it I need to know my compression ratio. So let me lay it out for you guys.

Engine : B18A1
Head : B18A1
Connect Rods : Eagle H beam - stock stroke
Head Gasket : OEM 3-layer
Pistons : Wiseco K541M81 - Stated CR - 8.3:1
---------- Dome : -12 - Deck Clearance : 0.020-

http://www.c-speedracing.com/h...c.php I was attempting to use this calculator. Can anybody give me an exact answer? I'm sure it should be apparent as 8.3:1, however I want to be reassured before I order my ECU. Thanks all.

 

I use that same calculator on that same website and i go by what it says. I thinks it pretty accurate.

 

Well the reason I'm asking is when it comes to Piston Deck Height. Do I type in "-.020" or "0.020" ? Because "-0.020" means its that much out of the hole. However on the site I got the piston info from its listed as "0.020-" and I don't know if that means its out of the hole or in it.

If I imput it into the calculator as being out of the hole("-0.020") then the CR jumps to a bout 8.9:1. However if I enter it as being in the hole("0.020") then its about 8.3:1 Which would be more along the lines of what the pistion was labled.

 

Bump

 

ttt