Plug to piston clearance?

art leong · 12-05-2012, 07:12 PM

How much clearance should I have? Minimum? This is a hemi style chamber with the plug inthe center of the chamber. Pent roof piston, top of dome is under the plug.

pmrphil · 12-05-2012, 09:07 PM

I would think (depending on RPM, bearing clearance, etc.) .035 -.040 should be plenty. At .030 I have seen a bit of contact at higher RPM (7200-7400)

Mike Taylor 3601 · 12-06-2012, 10:17 AM

usaully if misses without gasket (.039) will be fine,I always make sure plug is'nt shrouded
by piston, probaly won't be on hemi style.
Mike Taylor 3601

12-05-2012, 07:12 PM	#1
art leong VIP Member Join Date: Dec 2001 Location: Richmond Hill, Georgia Posts: 2,003 Likes: 0 Liked 1 Time in 1 Post	Plug to piston clearance? How much clearance should I have? Minimum? This is a hemi style chamber with the plug inthe center of the chamber. Pent roof piston, top of dome is under the plug. __________________ Art Leong 2095 SS Last edited by art leong; 12-05-2012 at 09:49 PM.

12-05-2012, 09:07 PM	#2
pmrphil Member Join Date: Aug 2010 Location: CT Posts: 454 Likes: 1,782 Liked 345 Times in 149 Posts	Re: Plug to piston clearance? I would think (depending on RPM, bearing clearance, etc.) .035 -.040 should be plenty. At .030 I have seen a bit of contact at higher RPM (7200-7400) __________________ Phil Molski PMR Performance S/C 1623

12-06-2012, 10:17 AM	#3
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,362 Likes: 337 Liked 279 Times in 96 Posts	Re: Plug to piston clearance? usaully if misses without gasket (.039) will be fine,I always make sure plug is'nt shrouded by piston, probaly won't be on hemi style. Mike Taylor 3601