ring end gap/ how much is too much?
#1775264
03/09/15 08:46 AM
03/09/15 08:46 AM
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Joined: Jan 2008
Posts: 2,248
ILLINOIS
volaredon
OP
top fuel
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OP
top fuel
Joined: Jan 2008
Posts: 2,248
ILLINOIS
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putting together a .030 over 360 for a daily driver Ramcharger, LA block, Magnum heads, 4 barrel carb, Speed Pro Hyper pistons,(#405CP)
Mahle Moly ring set. Out of the box, the rings were tight/ .013-.014 was typical, file fit them, instructions with rings said that .016 was minimum allowable, though I had read somewhere (here, I thought) about having to run a larger ring gap with hyper pistons than stock cast.
Got all of them to .022/.023 except for one ring, had my son helping me measure and file, I let him file the last few cylinders' worth of them while I measured, and we have one top ring that he over did a bit, somehow that one wound up at .032. Are we screwed, having to buy another set of rings to replace that one?
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Re: ring end gap/ how much is too much?
[Re: volaredon]
#1775265
03/09/15 10:57 AM
03/09/15 10:57 AM
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Joined: Jan 2003
Posts: 9,826
las vegas
70AARcuda
master
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master
Joined: Jan 2003
Posts: 9,826
las vegas
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the larger top ring gap is for KB hyper pistons due to the location of the top ring...as being higher on the pistons...
the speed pro or seal power pistons use standard ring gaps for their bore sizes.
Tony
70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: ring end gap/ how much is too much?
[Re: volaredon]
#1775266
03/09/15 04:25 PM
03/09/15 04:25 PM
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Joined: Aug 2003
Posts: 43,207
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,207
Bend,OR USA
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I've seen many NOS racers use .050 or larger on top ring gaps with no problems  Is that ring a top or second ring? If second I wouldn't be a bit concerned on it  If it's a top ring put it in the #7 or #8 cylinder, they run the hottests of all the cylinders  Either way it isn't a deal breaker in either location
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: ring end gap/ how much is too much?
[Re: volaredon]
#1775267
03/09/15 05:17 PM
03/09/15 05:17 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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You can get 1 set if you call the company... .010 is a bit much on the top ring... if your not in a hurry to put it together I would call for a single set... that would put your mind at ease... JMO 
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Re: ring end gap/ how much is too much?
[Re: volaredon]
#1775270
03/09/15 10:40 PM
03/09/15 10:40 PM
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Joined: Mar 2006
Posts: 9,846
MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,846
MI, usa
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Quote:
interesting read. It is a top ring, and according to the box the top rring is "steel" not listed as "cast" like most. 2nd ring is moly in the set.
Most sets will be a moly top, cast second. The moly ring will have a semi shiney silver face, the cast will be dark gray.
Doug
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Re: ring end gap/ how much is too much?
[Re: dvw]
#1775271
03/10/15 08:38 PM
03/10/15 08:38 PM
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Joined: Jan 2008
Posts: 2,248
ILLINOIS
volaredon
OP
top fuel
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OP
top fuel
Joined: Jan 2008
Posts: 2,248
ILLINOIS
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Quote:
Quote:
interesting read. It is a top ring, and according to the box the top rring is "steel" not listed as "cast" like most. 2nd ring is moly in the set.
Most sets will be a moly top, cast second. The moly ring will have a semi shiney silver face, the cast will be dark gray.
Doug
Yup when we initially put them in, we switched the 1st and 2nd rings, going by the cross section views provided with them, did not initially see the markings on the box end tabs/ we did get all the dots "up" motor still on stand, short block not quite complete, my son is buying parts as his CC will allow ("student card" not much of a ceiling) between Summit and feebay. just got the cam today via the Brown truck, We are going with a COMP 260H, but I made him spend the extra to buy it "nitrided" because of todays (commonly available) oils.. an off the shelf cam suddenly becomes a "custom" because of 1) the nitride treatment and 2) It's a mopar not a Shivvy or Furd.
Summit carries already nitrided "commonly sold" COMP cams for the other 2 companies but not for Mopar. $180 cam n lifter kit becomes a $330 cam n lifter kit... for Furd and Shivvy it would have been only $30-40 more NOT $150.
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Re: ring end gap/ how much is too much?
[Re: MR_P_BODY]
#1775273
03/11/15 03:28 AM
03/11/15 03:28 AM
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Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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Quote:
You can get 1 set if you call the company... .010 is
a bit much on the top ring... if your not in a hurry
to put it together I would call for a single set...
that would put your mind at ease... JMO
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Re: ring end gap/ how much is too much?
[Re: Diplomat360]
#1775277
03/17/15 10:50 AM
03/17/15 10:50 AM
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Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
Rapid340
top fuel
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top fuel
Joined: Sep 2004
Posts: 2,093
oberlin, Ohio
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Pay close attention to installing the second ring correctly, if just one is upside down and everything else is correct, your oil consumption will almost DOUBLE. (I saw this in a test Hastings mfg had published). BTW,a bit more gap on the second ring is actually beneficial. Don't be too hard on your son, the additional top ring gap on one cylinder will likely cost you under 2HP, maybe less than one on a mild build.
1971 Factory Appearing Duster 340 11.000 @ 122 mph
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