got my ross piston and hotcam

[la400ex]

I just got my ross piston and my hotcam in. On the bottom of the piston, it says 88M. Does that mean 88mm because I wanted an 87. What is the 88, a 426?? Should I send it back? Thanks, Ant.

[YZROOSTINYA]

call them and ask what they sent, it should have a spec sheet.

get it mic'd

[la400ex]

This is what my spec sheet says.
Displacement-blank
bore size- 3.425
clearance .002
dome height .165
comp height 1.025
top ring 1.5
second ring 1.5

[YZROOSTINYA]

my top ring is larger than the second ring on my je

i dont know what the specs are supposed to be, if i remem i will bring in my spec sheet tomorrow

[la400ex]

I just looked at rosspistons.com and the 3.425 bore is what they have listed for the 87mm so I guess its right. I just dont know what the 88M is for on the bottom of the piston. Thanks, Ant.

[wyndzer]

Your spec sheet says the bore size is 3.425 inches, which translates into 86.995 mm. You have the right size piston it seems to me.

[3x440ex]

I ordered the ross 416 and the bore size on the spec sheet is 4.25 but it does say 88m on the inside of the piston....if i remember correctly, it was miced at 4.2334...

[FF1O5]

is that the old style hotcam?

[TC426EX]

88mm is a 426... 87mm is a 416...

[Chanman420q]

mesaure the diamiter of the piston.

[adeptex]

Instead of forging several pistons, they use an 88 for 86,87,and 88mm bores. they just machine them for each application.

[Silverfox@C&DRacing]

Originally posted by FF1O5
is that the old style hotcam?

you are correct, I didn't think any of those were out their anymore :D a company must have had a lot setting on their shelves for quite a while.

[la400ex]

old style? lol.....check the original post date. I got that stuff in 02. Its long gone now. I did finally get an answer on the 88m thing. Only took a year and a half lol. Later, Ant.

[3x440ex]

i was looking for the same answer and did a search:D

[la400ex]

lol, i was wondering how this post came back.