Anyone measured the squish angle of a Thunderstorm piston before?
I always thought they had a 15 deg squish angle:
From - http://www.nrhsperformance.com/tech_thunderstorms.shtml
Quote:
the squish band shelf in the Thunderstorm head is 15 degrees, and in fact the factory Thunderstorm piston has a matching 15 degree dome angle.
From - http://www.nrhsperformance.com/tech_squish.shtml
Quote:
Buell Thunderstorm heads and matching pistons are set up this way, with a squish angle of 15 degrees.
http://xlforum.net/vbportal/forums/arch ... 22842.html
Quote:
The Thunderstorm piston has a 15 degree dome angle and gives 10:1 when placed under a 67cc chamber. The Thunderstorm chamber is 67cc and has a matching 15 degree squish band cast into it.
So to put a Thunderstorm piston under a Lightning head, you'd need to cut the squish band out to 15 degrees.
So to put a Thunderstorm piston under a Lightning head, you'd need to cut the squish band out to 15 degrees.
but when I actually measured one (out of a 2002 PBS X1):
The part number itself doesn't tie up with the part number in the parts book for Thunderstorm pistons (which come with rings), however I think I remember asking Ursus a similar question when I last had a Thunderstorm top end, before I sold it, and (I think) he looked on HDNET and it said it was the PN of the piston only and was listed as part of the set.
