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Ring end gap #1000428 05/26/11 07:19 PM 05/26/11 07:19 PM
Joined: Jan 2003 Posts: 3,623 Millinocket, Maine J JonC OP master
JonC OP master J Joined: Jan 2003 Posts: 3,623 Millinocket, Maine	I'm putting my 340 +.040 engine back together. What ring gap should I use? Cast pistons .040 over, Moly rings.

Re: Ring end gap [Re: JonC] #1000429 05/26/11 08:01 PM 05/26/11 08:01 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	top-.016". 2nd-.012" live every 24 hour block of time like it's your last day on earth

Re: Ring end gap [Re: RapidRobert] #1000430 05/26/11 08:13 PM 05/26/11 08:13 PM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Quote: top-.016". 2nd-.012" Current thinking is second ring gap should be wider than top gap... It has been found that the second ring can trap pressure between the rings and cause the top ring to flutter in it's groove losing ring seal.... I'd set the second @ .018.. "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

Re: Ring end gap [Re: 1_WILD_RT] #1000431 05/26/11 08:24 PM 05/26/11 08:24 PM
Joined: Jan 2003 Posts: 3,623 Millinocket, Maine J JonC OP master
JonC OP master J Joined: Jan 2003 Posts: 3,623 Millinocket, Maine	That's a bit of a difference between the two answers.

Re: Ring end gap [Re: JonC] #1000432 05/26/11 08:29 PM 05/26/11 08:29 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Old school was .004 per inch of bore on the top ring and .003 on the 2nd comp ring as the top ring is closer to the fire and will expand more. New thought is the opposite. The old has worked for decades & is my pref live every 24 hour block of time like it's your last day on earth

Re: Ring end gap [Re: JonC] #1000433 05/26/11 08:30 PM 05/26/11 08:30 PM
Joined: Oct 2003 Posts: 3,698 NE Oklahoma V Von master
Von master V Joined: Oct 2003 Posts: 3,698 NE Oklahoma	Id file them the same, 1st and 2nd groove. IMO, ring gap, (as long as its not tight) isnt that big of a deal. 72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72. Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.

Re: Ring end gap [Re: RapidRobert] #1000434 05/26/11 08:33 PM 05/26/11 08:33 PM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Nothing wrong with old school, it's worked well for me in the past also... But learning new tricks from guys that have results to back it up isn't a bad idea either... "The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."

Re: Ring end gap [Re: Von] #1000435 05/26/11 08:34 PM 05/26/11 08:34 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Jonc we're not helping you today are we live every 24 hour block of time like it's your last day on earth

Re: Ring end gap [Re: RapidRobert] #1000436 05/26/11 08:50 PM 05/26/11 08:50 PM
Joined: Jan 2003 Posts: 3,623 Millinocket, Maine J JonC OP master
JonC OP master J Joined: Jan 2003 Posts: 3,623 Millinocket, Maine	Quote: Jonc we're not helping you today are we Ha Ha, but I just want to get it back together. I guess it wouldn't hurt a street car to do it old school.

Re: Ring end gap [Re: Von] #1000437 05/26/11 09:27 PM 05/26/11 09:27 PM
Joined: Oct 2005 Posts: 4,945 WI Dcuda69 master
Dcuda69 master Joined: Oct 2005 Posts: 4,945 WI	Quote: Id file them the same, 1st and 2nd groove. IMO, ring gap, (as long as its not tight) isnt that big of a deal. If in doubt fail on the big side. N/A I would do .016-.018 on both and run it!!

Re: Ring end gap [Re: Dcuda69] #1000438 05/26/11 09:57 PM 05/26/11 09:57 PM
Joined: Aug 2005 Posts: 11,543 chicagoland,usa B buildanother I Live Here
buildanother I Live Here B Joined: Aug 2005 Posts: 11,543 chicagoland,usa	That'll work

Re: Ring end gap [Re: buildanother] #1000439 05/26/11 10:29 PM 05/26/11 10:29 PM
Joined: Apr 2008 Posts: 301 California C court9155 enthusiast
court9155 enthusiast C Joined: Apr 2008 Posts: 301 California	I go with the .0045 and .0035 all motor rule and .006 and .0045 for nitrous or low boost. http://www.totalseal.com/TechPage.aspx#trTSFAQ 67 charger

Re: Ring end gap [Re: court9155] #1000440 05/27/11 12:39 AM 05/27/11 12:39 AM
Joined: Apr 2008 Posts: 301 California C court9155 enthusiast
court9155 enthusiast C Joined: Apr 2008 Posts: 301 California	Wow did some research and I dont believe everything I read but: http://blogs.hotrod.com/piston-ring-gap-194.html 67 charger

Re: Ring end gap [Re: court9155] #1000441 05/27/11 12:58 AM 05/27/11 12:58 AM
Joined: Jul 2008 Posts: 30,424 Florida STAYcation dOrk ! The village idiot's idiot
dOrk ! The village idiot's idiot Joined: Jul 2008 Posts: 30,424 Florida STAYcation	Quote: Wow did some research and I dont believe everything I read ...and you should REALLY question ones who are Really TemperMENTAL JC ...what do you have for ring gap now? uNless you bought specific OVERsized rings .... normally - very little filing will be necessary.

Re: Ring end gap [Re: dOrk !] #1000442 05/27/11 09:54 AM 05/27/11 09:54 AM
Joined: Jan 2003 Posts: 3,623 Millinocket, Maine J JonC OP master
JonC OP master J Joined: Jan 2003 Posts: 3,623 Millinocket, Maine	Quote: Quote: Wow did some research and I dont believe everything I read ...and you should REALLY question ones who are Really TemperMENTAL JC ...what do you have for ring gap now? uNless you bought specific OVERsized rings .... normally - very little filing will be necessary. I never thought to measure the old rings, I'll do that today.

Re: Ring end gap [Re: JonC] #1000443 05/27/11 10:34 AM 05/27/11 10:34 AM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	Also in this case I believe in the old adage too much is better than not enough. Read this. http://www.kb-silvolite.com/features.php?action=read&F_id=62

Re: Ring end gap [Re: MoparforLife] #1000444 05/27/11 12:20 PM 05/27/11 12:20 PM
A Anonymous Unregistered
Anonymous Unregistered A	That "flutter" deal may be true for a full out high RPM RACE engine--but for a street unit old school is still a great way to go--doing an 8500RPM Drag small block go the other way. Get the rings on right side up and no matter what you do it will be fine

Re: Ring end gap [Re: JonC] #1000445 05/27/11 12:32 PM 05/27/11 12:32 PM
Joined: Jul 2008 Posts: 30,424 Florida STAYcation dOrk ! The village idiot's idiot
dOrk ! The village idiot's idiot Joined: Jul 2008 Posts: 30,424 Florida STAYcation	Quote: I never thought to measure the old rings, I'll do that today. THAT would be an interesting # to see ... but what I am talking about is the NEW rings .. in the NEW bore. And like was said above .. it is BESTer to have the gaps a tad fat .. than toooo tight. NASTY things can happen if the ring ends butt and then break.

Re: Ring end gap [Re: dOrk !] #1000446 05/27/11 07:04 PM 05/27/11 07:04 PM
Joined: Jan 2003 Posts: 3,623 Millinocket, Maine J JonC OP master
JonC OP master J Joined: Jan 2003 Posts: 3,623 Millinocket, Maine	Old top ring is .025, new top ring is .016. Old second ring is .027, new second ring is .017. The engine bore has not changed in this rebuild, all I did was have it balanced.

Re: Ring end gap [Re: JonC] #1000447 05/27/11 07:09 PM 05/27/11 07:09 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	You have 016 and 017, I'd run em. OT; Jon What did you do to the bore finish? live every 24 hour block of time like it's your last day on earth

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