347 ci piston ring gap??? nitrous motors
Thread Starter
Launching!
iTrader: (8)
Joined: Mar 2004
Posts: 265
Likes: 0
From: milwaukee wisconsin
347 ci piston ring gap??? nitrous motors I'm finally starting to re-build my motor. My question is what does or has everyone filed their piston ring gaps for their nitrous engines?
My info was
.007" x bore for the top ring
.008" x bore for the second ring
top ring
second ring
oil ring
The info I got told me minimum of .015" on the oil rings. the wave ring right now has ZERO clearance. Does that Wave ring need that .015"? The rings that go above and below the wave ring have the spec'd .015" clearance.
Thanks
JEFF
My info was
.007" x bore for the top ring
.008" x bore for the second ring
top ring
second ring
oil ring
The info I got told me minimum of .015" on the oil rings. the wave ring right now has ZERO clearance. Does that Wave ring need that .015"? The rings that go above and below the wave ring have the spec'd .015" clearance.
Thanks
JEFF
What kind of rings are they? My Childs and Albert Dura-Moly rings came with a sheet on recommend end gaps for different uses.
The recommend end gap was .0045 per inch of diameter bore for nitrous use on the top ring (that was the MINIMUM recommend gap, so Im guessing for a really big shot of nitrous 500+ you should go bigger?). I cant remember what the second ring was. The wavy one should not need to be gapped but you should double check with the manufacturer. The other two oil control rings (3rd groove) should have a minimum and maximum gap supplied by the manufacturer that must be checked with a feeler gauge.
Best thing to do would be to call the company that makes your rings and see what they recommend. Measure twice, file once. then measure again.
The recommend end gap was .0045 per inch of diameter bore for nitrous use on the top ring (that was the MINIMUM recommend gap, so Im guessing for a really big shot of nitrous 500+ you should go bigger?). I cant remember what the second ring was. The wavy one should not need to be gapped but you should double check with the manufacturer. The other two oil control rings (3rd groove) should have a minimum and maximum gap supplied by the manufacturer that must be checked with a feeler gauge.
Best thing to do would be to call the company that makes your rings and see what they recommend. Measure twice, file once. then measure again.
Don't worry about the oil ring as long as the scrapers are at recommened.I believe on my old 346 nos motor i was at .26 top .28 on the lower.Your better a little bigger when it comes to nitrous.
I'm finally starting to re-build my motor. My question is what does or has everyone filed their piston ring gaps for their nitrous engines?
My info was
.007" x bore for the top ring
.008" x bore for the second ring
Thats .27 on the top and .31 on the second.
My info was
.007" x bore for the top ring
.008" x bore for the second ring
Thats .27 on the top and .31 on the second.
Thread Starter
Launching!
iTrader: (8)
Joined: Mar 2004
Posts: 265
Likes: 0
From: milwaukee wisconsin
Originally Posted by tuff
I'm finally starting to re-build my motor. My question is what does or has everyone filed their piston ring gaps for their nitrous engines?
My info was
.007" x bore for the top ring
.008" x bore for the second ring
Thats .27 on the top and .31 on the second.
My info was
.007" x bore for the top ring
.008" x bore for the second ring
Thats .27 on the top and .31 on the second.
the .027" and .031" is what I'm set at now. I spray 150 before, now planning on more. Just lookin' for someone to back up my thoughts
first LS1 buildJEFF
Trending Topics
Id go .28 .30.I like just having a .02 spread between the two rings.Your better a little more loose on the end gap if you plain on spraying a big dose.Last thing you want is to have them to tight on the bottle.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Teching In
Joined: May 2006
Posts: 31
Likes: 0
From: dallas
i just filed mine last night.
347 with je 3.905 pistons and total seal gapless top ring
the rings were supposed to come pre gapped and the machine shop guy said just throw them in and don't worry about it. the seconds showed close at .024 on every cyl so i left them alone. the tops were way tight at .023 instead of the suggested .031.
i filed the tops to .031
i plan on using a 200 shot as well.
sounds like were gonna have the same setup, which cam you going to use?
i can't decide. it's a DD and i want my g/f to be able to drive it so i can't go with a huge lope :-/
347 with je 3.905 pistons and total seal gapless top ring
the rings were supposed to come pre gapped and the machine shop guy said just throw them in and don't worry about it. the seconds showed close at .024 on every cyl so i left them alone. the tops were way tight at .023 instead of the suggested .031.
i filed the tops to .031
i plan on using a 200 shot as well.
sounds like were gonna have the same setup, which cam you going to use?
i can't decide. it's a DD and i want my g/f to be able to drive it so i can't go with a huge lope :-/
