Squish

[ArmandTanzarian]

Hello all,

I've just got my barrel etc back from JB Tuning after some mild tuning. (mostly just just making sure everything matches and flows right)

I know how to measure squish using solder but what is the best way to adjust it? Is it better to add gasket width to the head or the base?


Cheers

[J1MS]

Replacing just the head gasket with a different thickness will only alter squish clearance and compression where as the base gasket will also effect the port timings slightly.

[ArmandTanzarian]

Cheers.

Since JB has just spent his time and my money on matching them up I guess that the head is the one to adjust.

[davidblythe]

unless he knew the deck clearance beforehand the port timings are an approximation anyway

check these, then you will know where to adjust

[ArmandTanzarian]

He knew it was for a spanish casing which he said had a deck height 1mm more than an Italian one. (as do Indian ones apparently)

[davidblythe]

deck height is measured where the piston finishes at tdc in relation to the barrell 1mm can make a difference of 5 degs on the port timings