Piston deck clearance

[MerkXRTurbo]

Hey guys, the guru who's helping me out with ordering my custom pistons has requested factory piston/deck clearance data. Sitting here with a broken thumb it's not too convenient to pull my engine down right the moment, so if anybody can get the measurements I'd really appreciate it.

This is for a 3.2, in case it matters. Anybody have a short block handy? Can someone measure the difference between the crown of the piston and the deck at TDC?

 

[SHO_DOODmorrris]

sorry my sb is at school right now. i can tell you tomorrow though if noone replys.

 

[zak]

Compression height 1.315. Deck height is in Helms, along with rod length which should all help calculate a few thousandths above deck (postive deck height). Let me know if you determine quench distance.

zak

 

[MerkXRTurbo]

Umm, yeah I COULD calculate it, but I'd rather use the more error proof method of measurement. SHO DOOD, I anxiously await your data! Thanks!

 

[sho_sc]

Umm, yeah I COULD calculate it, but I'd rather use the more error proof method of measurement. SHO DOOD, I anxiously await your data! Thanks!

If you don't mind too much, would you share the measurements.

Oddly, in the motorcycle world, you can find all that data and calculate/adjust the quench size with a swap of a gasket.

 

[MerkXRTurbo]

I will definitely do that when I get it. SHO DOOD, where ya at?

If he doesn't get it to me I'll pop off a head and let ya guys know.

 

[zak]

Calculating it is much easier than removing a head . . . do you want the formula?

 

[93rev2sev]

hold the boat.

I have a short block on my bench right now...you will have your measurement tonight.

 

[SHO_DOODmorrris]

yeah mine has the wiesco pistons in it already so i cant really measure it.

 

[93rev2sev]

the dome protrudes .005" above the deck. I used .016" parallels and got a .011 feeler under the straightedge at the sides of the casting flash in the center of the piston.

Considering the edge of the piston displayed a clearance of .005....if the casting flash was removed (along with the raised lettering) the dome would be .010-.011 in height

 

[MerkXRTurbo]

Thank you for your measurements! They are a big help!