AM Rings? - Page 4 - ZR-1 Net Registry Forums

A26B · 07-30-2011

One more helpful hint.... Excessive back clearance is not a good thing. Combined with "loose" side clearance, excessive back clearance has a negative effect on ring stability.

LGAFF · 07-30-2011

In reading federal mogel and others .002 to .004 is the recommended value.....several articles noted this is the minimum for allowing gas pressure to seal the ring against the piston wall.

I do not see these as having excessive back clearance.

I do not see ring flutter as an issue..apparently you need 840o RPM for this to happen

A26B · 07-30-2011

I do not know what the back clearance is Lee. You mentioned that it should be a minimum of 0.005" but if it is significantly greater, due to the ring cross section width, then stability does become an issue that will be exacerbated by higher side clearance. I'm more concerned about longevity than flutter.

Have you checked the ring cross section width & compared it to a new stock ring? I can get you that measurement from a new one if you like. This was one of the principal concerns with the Total Seal rings. It would be nice to resolve this.

LGAFF · 07-30-2011

See what you get on the measurement.....I will measure one here

1st ring side clearance is .004
2nd ring side clearance is .003

LGAFF · 07-30-2011

I see a difference of about -.0025 to -.003...

total seal is thinner

LGAFF · 07-30-2011

I will call total seal on Monday; the guy I spoke to was very confident that these would be fine...will send him a note and call. This is where having someone who is truly an expert in rings would help.

There is alot of info out there.....what is true and what is belief are hard to discern

I did send them the OEMs when I ordered them to compare

A26B · 07-30-2011

So happens I will be seeing A couple of real experts on the LT5 next weekend :-)

LGAFF · 07-30-2011

Used a caliper to measure the backspace on the piston, then measured it against the ring width, and check with feeler gauge: .016 on the Stock and .026 on the Total seal

LGAFF · 07-30-2011

I don't see anywhere that references too much backspacing.....the ring is actually pushed out against the liner due to compression.....so not sure what I should be referencing.....

Any clues? I did send a note to total seal on specs

LGAFF · 07-30-2011

Should have just went with a damn 368

07-30-2011	#31
A26B Join Date: Dec 2003 Location: Arcadia, OK Posts: 3,399	Re: AM Rings? One more helpful hint.... Excessive back clearance is not a good thing. Combined with "loose" side clearance, excessive back clearance has a negative effect on ring stability. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.

07-30-2011	#32
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,180	Re: AM Rings? In reading federal mogel and others .002 to .004 is the recommended value.....several articles noted this is the minimum for allowing gas pressure to seal the ring against the piston wall. I do not see these as having excessive back clearance. I do not see ring flutter as an issue..apparently you need 840o RPM for this to happen __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

07-30-2011	#33
A26B Join Date: Dec 2003 Location: Arcadia, OK Posts: 3,399	Re: AM Rings? I do not know what the back clearance is Lee. You mentioned that it should be a minimum of 0.005" but if it is significantly greater, due to the ring cross section width, then stability does become an issue that will be exacerbated by higher side clearance. I'm more concerned about longevity than flutter. Have you checked the ring cross section width & compared it to a new stock ring? I can get you that measurement from a new one if you like. This was one of the principal concerns with the Total Seal rings. It would be nice to resolve this. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.

07-30-2011	#34
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,180	Re: AM Rings? See what you get on the measurement.....I will measure one here 1st ring side clearance is .004 2nd ring side clearance is .003 __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

07-30-2011	#35
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,180	Re: AM Rings? I see a difference of about -.0025 to -.003... total seal is thinner __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

07-30-2011	#36
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,180	Re: AM Rings? I will call total seal on Monday; the guy I spoke to was very confident that these would be fine...will send him a note and call. This is where having someone who is truly an expert in rings would help. There is alot of info out there.....what is true and what is belief are hard to discern I did send them the OEMs when I ordered them to compare __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 07-30-2011 at 04:27 PM.

07-30-2011	#37
A26B Join Date: Dec 2003 Location: Arcadia, OK Posts: 3,399	Re: AM Rings? So happens I will be seeing A couple of real experts on the LT5 next weekend :-) __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.

07-30-2011	#38
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,180	Re: AM Rings? Used a caliper to measure the backspace on the piston, then measured it against the ring width, and check with feeler gauge: .016 on the Stock and .026 on the Total seal __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

07-30-2011	#39
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,180	Re: AM Rings? I don't see anywhere that references too much backspacing.....the ring is actually pushed out against the liner due to compression.....so not sure what I should be referencing..... Any clues? I did send a note to total seal on specs __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

07-30-2011	#40
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,180	Re: AM Rings? Should have just went with a damn 368 __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359