Re: Rings gap - 150 shot
[Re: dart_73_br]
#1566628
01/21/14 11:05 PM
01/21/14 11:05 PM
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Joined: Nov 2003
Posts: 10,384 Upstate NY
Bigcube
I Live Here
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I Live Here
Joined: Nov 2003
Posts: 10,384
Upstate NY
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With a 4.440" bore this is how much I changed them for a healthy shot.
Top ring gap (N/A) .020 Top setting .032 2nd ring gap (N/A) .016 2nd setting .036
Jim
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Re: Rings gap - 150 shot
[Re: Crizila]
#1566631
01/22/14 12:47 PM
01/22/14 12:47 PM
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Joined: Feb 2004
Posts: 6,257 acworth / N. georgia - south e...
cheapstreetdustr
master
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master
Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
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it also depends on piston material. forged aluminum has a different causation than Hypereutectic pistons. i would look into what your piston manufacturer recommends as well..
365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured [image][/image]
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Re: Rings gap - 150 shot
[Re: dart_73_br]
#1566633
01/22/14 01:34 PM
01/22/14 01:34 PM
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Joined: Feb 2004
Posts: 6,257 acworth / N. georgia - south e...
cheapstreetdustr
master
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master
Joined: Feb 2004
Posts: 6,257
acworth / N. georgia - south e...
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i think the hypers end up with top ring gap at 25 i dont have my notes handy on that build... KB will tell you the correct amount for sure.
365" Iron J heads,,3480lbs best 1.39 60ft on SS springs.10.54,124 mph ...6.67 1/8th et.average 60fts 1.46 w/ small cam &.063 no2 pill tagged & insured [image][/image]
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Re: Rings gap - 150 shot
[Re: dart_73_br]
#1566636
01/22/14 07:20 PM
01/22/14 07:20 PM
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Joined: Apr 2009
Posts: 3,415 Toronto
mshred
master
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master
Joined: Apr 2009
Posts: 3,415
Toronto
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Quote:
Found in their hyper catalog...
street nitrous:
TOP ring factor = 0.008 > 3.94 x 0.008 = 0,0315" SECOND ring = 0.004 x bore > 0,0157"
I think thatīs it...
That number for the second ring seems too tight to me, even on motor.
I followed my ring manufacturers instructions when gapping mine for the nitrous, and it recommended a larger ring gap up top then for the second ring...Then I posted about my gaps on another board, and was told by a bunch that the second ring gap should be bigger then the first to allow the trapped gases to escape.
I would say gap them larger then you actually want to spray, because you are going to want more pill size after a while, and the larger gaps really shouldn't hurt anything...but seeing your running hypers, I wouldn't push them too much...I'd be more comfortable spraying cast then hyper pistons, but thats just me.
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Re: Rings gap - 150 shot
[Re: mshred]
#1566637
01/22/14 08:16 PM
01/22/14 08:16 PM
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Joined: Aug 2003
Posts: 43,163 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,163
Bend,OR USA
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Quote:
Quote:
Found in their hyper catalog...
street nitrous:
TOP ring factor = 0.008 > 3.94 x 0.008 = 0,0315" SECOND ring = 0.004 x bore > 0,0157"
I think thatīs it...
That number for the second ring seems too tight to me, even on motor.
I followed my ring manufacturers instructions when gapping mine for the nitrous, and it recommended a larger ring gap up top then for the second ring...Then I posted about my gaps on another board, and was told by a bunch that the second ring gap should be bigger then the first to allow the trapped gases to escape.
I would say gap them larger then you actually want to spray, because you are going to want more pill size after a while, and the larger gaps really shouldn't hurt anything...but seeing your running hypers, I wouldn't push them too much...I'd be more comfortable spraying cast then hyper pistons, but thats just me.
Hypertitics(SP?) are cast pistons, they are not forged I'll bet you meant forged pistons for all out racing on NOS or any other power adder, yes?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Rings gap - 150 shot
[Re: Cab_Burge]
#1566638
01/22/14 10:43 PM
01/22/14 10:43 PM
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Joined: Apr 2009
Posts: 3,415 Toronto
mshred
master
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master
Joined: Apr 2009
Posts: 3,415
Toronto
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Quote:
Quote:
Quote:
Found in their hyper catalog...
street nitrous:
TOP ring factor = 0.008 > 3.94 x 0.008 = 0,0315" SECOND ring = 0.004 x bore > 0,0157"
I think thatīs it...
That number for the second ring seems too tight to me, even on motor.
I followed my ring manufacturers instructions when gapping mine for the nitrous, and it recommended a larger ring gap up top then for the second ring...Then I posted about my gaps on another board, and was told by a bunch that the second ring gap should be bigger then the first to allow the trapped gases to escape.
I would say gap them larger then you actually want to spray, because you are going to want more pill size after a while, and the larger gaps really shouldn't hurt anything...but seeing your running hypers, I wouldn't push them too much...I'd be more comfortable spraying cast then hyper pistons, but thats just me.
Hypertitics(SP?) are cast pistons, they are not forged I'll bet you meant forged pistons for all out racing on NOS or any other power adder, yes?
No, I meant what I said cab lol...As far as I know, cast and hypers are made from slightly different processes...I know both are touchy, but have always been warned that hypers are even more so and when they let go, it's a little nastier (although at that point, pain is pain lol).
Of course, I could be all wrong...I have only ever sprayed a forged motor- it was a safety net for an idiot like me lol
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Re: Rings gap - 150 shot
[Re: Cab_Burge]
#1566639
01/22/14 10:45 PM
01/22/14 10:45 PM
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Joined: Oct 2007
Posts: 3,978 Hilltown Pa
1967dartgt
master
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master
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
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Hyper and moly rings not best choices for nitrous.
Brett Miller W9 cnc'd heads STR Chassis fabraction
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Re: Rings gap - 150 shot
[Re: 1967dartgt]
#1566640
01/22/14 11:02 PM
01/22/14 11:02 PM
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Joined: Nov 2004
Posts: 4,330 Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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150 is not that much... But, most people who intend to run 150 end up with more.
NO WAY IN HADEES I would run that gap on a second ring. But, that said I do not follow the flock with the larger ring gap on the second ring. The idea is whatever gets below the top ring should have extra room to get by the second. Ring flutter comes from pressure between the rings. Keep it up and eventually you put so much pressure between them with a little heat in the valve pocket and you lift the land. The top ring will always see more heat than the second. Which equals more ring expansion in the top ring. I set my gaps the same but, ran fairly large gaps.
Leon
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: Rings gap - 150 shot
[Re: dart_73_br]
#1566643
01/22/14 11:40 PM
01/22/14 11:40 PM
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Joined: Apr 2009
Posts: 3,415 Toronto
mshred
master
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master
Joined: Apr 2009
Posts: 3,415
Toronto
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Quote:
Guys, this juice stuff might be addictive but I know this hyper are crap for large nitrous shot so thats why I'm limiting it to 150. And thats what I have now.. So... Will put it together and have some fun....
Correction: not MIGHT be addictive but WILL be addictive.
Take it from me, especially if you have the pistons out and have not balanced them yet...Sell your pistons and rings, get a forged piston and non moly rings and put them in with a gap that is sufficient for say a 200-250 hit....When the addiction kicks in, you'll be glad you did it
Just my ...good luck and have fun with it regardless !
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Re: Rings gap - 150 shot
[Re: Crizila]
#1566645
01/22/14 11:55 PM
01/22/14 11:55 PM
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Joined: Oct 2009
Posts: 1,267 North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
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I used to run the KB hyper pistons in a 360 back in the 90's. I gapped the rings for nitrous like the instructions said . I never ran less than 150 shot and ran 175 some times. I had the kb 107's and J-heads. I always ran about 28* timing and 93 octane fuel.Never had any problems...
1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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