2g pistons dont fit in my 6 bolt block ....help

[91gvr4gsr]

i just picked up a set of 2g pistons on 1g rods and i went to install them in my block and the pistons are too big .........i was told they are the same bore size as the 1g pistons


the number on the piston is 63dtf1 any info ?? what size is the piston

 

[Burnett03]

Maybe you bought oversized pistons?

 

[91gvr4gsr]

Maybe you bought oversized pistons?

yes i think so but is there a way to tell how much over

 

[JusMX141]

Ummmm....measure them. Not with a ruler, either.

Sometimes the oversize spec is cast into the crown of the piston, but not always.

 

[ilco187]

i once heard that 2g pistons were .20 over than 1g stock and have higher compression than 1g pistons

can anyone prove this

 

[JusMX141]

The standard bore dimension is the same for the 1G DSM's, 2G DSM's, and Lancer Evolution 4G63's.

The 1G DSM's have a 7.8:1 compression ratio, 2G's are 8.5:1, and Evo VIII and IX's are 8.8:1. This, of course, doesn't factor in head thickness...if you have the head milled, it obviously will raise the compression as well.

 

[91gvr4gsr]

i once heard that 2g pistons were .20 over than 1g stock and have higher compression than 1g pistons

can anyone prove this

thanks

 

[BkzProblem]

Did you read to what jusmx141 just typed?? 1g, 2g, evos are all 4g63... they all have the same bore size... main difference between them is the compression ratios... You can't go making decisions off of "what you heard"..... smh....

 

[ilco187]

use a Dial Bore Gauge, Stock bore of a 4G63 is 3.347" (85.0mm)

 

[Defiant]

Good god.