Re: Piston ring clearance
[Re: sixty9bee]
#183763
01/04/09 06:29 PM
01/04/09 06:29 PM
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Joined: Nov 2004
Posts: 3,544 Syracuse,NY
CompWedgeEngines
master
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master
Joined: Nov 2004
Posts: 3,544
Syracuse,NY
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Take a few of those rings and "mic" the thickness of the RING. Last year I had a set of rings that actually were thicker in some spots than other, binding the ring. Never saw such a thing. Also, make sure there isnt a little burr sticking in the ring groove somewhere. That is actually quite common to find in new pistons.Just a small nail file and its gone, and the rings will float and clearance properly. Double check just in case. Good luck.
RIP Monte Smith
Your work is a reflection of yourself, autograph it with quality.
WD for Diamond Pistons,Sidewinder cylinder heads, Wiseco, K1 rods and cranks,BAM lifters, Morel lifters, Molnar Technologies, Harland Sharp, Pro Gear, Cometic, King Engine Bearings and many others.
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Re: Piston ring clearance
[Re: sixty9bee]
#183764
01/04/09 07:05 PM
01/04/09 07:05 PM
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Joined: Aug 2003
Posts: 43,303 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,303
Bend,OR USA
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What temperture are you checking the ring clearances at? If it is real cold, under 50F the clearances may seem tighter, and they are than they would be at 70F or above. The aluminum piston expands 8 more times than the iron or steel rings, warm the piston up in a oven with the rings on it to 100 F and recheck the feel and actual clearances. I made the mistake of checking a set of piston in my shop in SO CA with half of the pistons sitting in the sun coming thru a window and the other half out of the sun. The air conditioner was on and the room temperature inside was right at 70F, the half of the pistons sitting in the sun light where several thousands bigger in the skirt than those that where out of the sun I finally figure it out and moved them all out of the sun light and remeasure them two hours later and all of them where within .0003 of each other. I have had a set of rings like BG has noted, very frustrating, one of the reasons you have to check parts when they don't seem right, when in doubt, check it out BTW, I like tight ring lands(.0008 to .0012) on a race motor in normal room temperatures
Last edited by Cab_Burge; 01/05/09 12:48 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Piston ring clearance
[Re: sixty9bee]
#183765
01/04/09 07:36 PM
01/04/09 07:36 PM
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Joined: May 2004
Posts: 855 Brisbane Australia
572B1
super stock
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super stock
Joined: May 2004
Posts: 855
Brisbane Australia
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Quote:
Ross pistons, sealed power rings. The oil rings and 2nd compression ring have .0025 clearance or more in the groove of piston. the top compression ring is so tight cannot get .0015 feeler gauge in groove with ring. can close ring gap by hand and ring still turns freely but ross calls for .001 to .004 has anyone else experienced this and what to do?
My venolia forged pistons require 3 to 4 thou ring side clearance,going buy there recomendations.
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