Piston ring gap? - Team Camaro Tech
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post #1 of 6 (permalink) Old Jan 20th, 10, 07:29 AM Thread Starter
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Scott
 
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Location: MA
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Piston ring gap?

I'm building my first 355 in about 20 years and had a great machine shop help with all the parts and machine work. Everything is spot on (double checking with the crude plasti-gauge). The pistons are manley forged flat tops and we ( my brother and I) had a question about the ring gaps. where should they be? the machine shop said .020 top and .024 on the second. well I filed the seconds a little to far and am about .025-.027ish. should I get another set of rings or go with the largest gap and not worry? Manleys paper in the box says:
http://www.manleyperformance.com/dl/...ston-rings.pdf
Everybody says the larger gap should be on the second ring not the top like on hyper pistons.
I want to get this right and will buy a set of rings if I have to and chalk it up to inexperience.

the engine usage will be weekend blasts and possibly a hit if NOS someday.

TIA
Scott

69 RS/SS X22 51-51 Dusk Blue coupe in resto......still.
69 X11 355 ci M22 3:73 12 bolt...current driver
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post #2 of 6 (permalink) Old Jan 20th, 10, 07:39 AM Thread Starter
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Scott
 
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Re: piston ring gap?

oh yeah the pistons are manley 590530-8 platinum series w/ 1/16 1/16 3/16 rings

69 RS/SS X22 51-51 Dusk Blue coupe in resto......still.
69 X11 355 ci M22 3:73 12 bolt...current driver
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post #3 of 6 (permalink) Old Jan 20th, 10, 11:40 AM
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Don
 
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Re: piston ring gap?

Smaller end gap is normally the top ring, be careful here when running nos.

Don
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Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968

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post #4 of 6 (permalink) Old Jan 21st, 10, 07:05 PM
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TJ
 
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Re: Piston ring gap?

i went by the ross racing papers on my build and put my top compression ring gap to .020 and my second to .026. I was taught to do a smaller gap on the second ring but ross said that the larger gap on the second allows the blow by from the first compression ring to escape easier rather than building up pressure which would unseat the first ring and thus allow even more blow by. It clicked with me and i figure they know what they are talking about so i think you should be perfectly fine... as long as you dont try to spray a large amount. ross recommends this ring gap up to 25 hp gains per cylinder with the bottle, thats a 200 shot. personally i wouldnt spray more than a 150 shot, but thats just me.
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post #5 of 6 (permalink) Old Jan 21st, 10, 10:33 PM
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Butch
 
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Re: Piston ring gap?

.020/.028 is fine, thats what i run some 327/350/400 race engines at

You do want the second ring to have more gap, they are like this in your new GM car too !

It gives a larger escape path for pressure that gets past the top ring (and it does) so it can escape and not build up too much pressure between the rings, the common way to solve this is accumulator grooves AND wider second ring gaps


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post #6 of 6 (permalink) Old Jan 22nd, 10, 03:48 PM
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Re: Piston ring gap?

That will be fine for the second ring. I will bet you a drink that you will never be able to tell.
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