Guys

For this combo which would be the Compression ratio end up being

Std 2.0 463 block (No Milling)
Std mitsu crank
wiseco hd 1400 stroker piston (9.0 to 1) std size from catalog
Std head gasket
Std head from Mitsubishi (no milling)
Long rod Carrillos (from their off the shelf catalog)

I have heard that stroker pistons have that much more dish on a long rod build that will lower the CR to 7.8?????

thanks for the advance

 

from what I have read, and if off the shelf wisecos stroker pistons are -21dish i may up with 7.8 to 1 wich is not suitable for my build,

I cant believe there is no availability for 2.0 156mm long rod stroker pistons with lower dish to keep the happy 9.0 to 1 CR for pump gas...

 

¨Compression Height for STD Evo piston is 35mm
Compression Height for 2.3L Stroker Evo piston is 28.7mm

35-28.7= 6.3mm

Connecting rod c-c for STD Evo is 150mm
Connecting rod c-c for 2.0L L/R Evo is 156mm

150-156 = -6

6.3 - 6.0 = 0.3mm lower in the cylinder.
0.3mm*(3.14159*42.5^2) = -1.7cc

9:1 CR STD piston = -14cc dish
"9:1" CR 2.3L stroker piston = -21cc dish

Difference is -7cc more dish. + -1.7cc = - 8.7cc less than STD Evo with 88mm stroke

For a 88mm stroke changing the dish by 9cc results in almost a full point of Rc... So by running the combination I was talking about (156mm rod w/2.3L piston) will give me an Rc of approximately 8:1 ¨

So from the quote, the std -21 dish Wiseco 1400 hd piston (from their catalog K627M85) with the rest of std parts on 4g63 will lower the CR too much, power and response wise

Now they have come out with a new stroker piston K669M85 called stroker hd2 with asymmetrical skirts that has lowered volume to -10 dish...that will bump the cr to more desirable value

 

using the EVO compression ratio calculator http://rbid.ru/cr/

We get 9.1 to 1 on a long rod 156mm setup using the all new wiseco pistons (std size) with their new -10dish on a 88mm crank (pn k669m85)