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how is too much top ring end gap #1749883 02/09/15 02:15 AM 02/09/15 02:15 AM
Joined: Jan 2003 Posts: 499 Gettysburg Pa R roadrunnerreds OP mopar
roadrunnerreds OP mopar R Joined: Jan 2003 Posts: 499 Gettysburg Pa	I'm in the process of assembling short block 318-390 stroker and my file fit ring for the top ring is at .022 i was going to make gap .017. Second ring is .012. When i used speed pro rings in 360 i made ring gaps. .018 top ring .020 second. Hard to get rings for this set up. Thanks Bradley

Re: how is too much top ring end gap [Re: roadrunnerreds] #1749884 02/09/15 02:41 AM 02/09/15 02:41 AM
Joined: Aug 2003 Posts: 43,309 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,309 Bend,OR USA	Quote: I'm in the process of assembling short block 318-390 stroker and my file fit ring for the top ring is at .022 i was going to make gap .017. Second ring is .012. When i used speed pro rings in 360 i made ring gaps. .018 top ring .020 second. Hard to get rings for this set up. Thanks Bradley I wouldn't hesitate at all to use .022 on the tops and .024 to .026 on the second rings, epsecailly if it is a pump gas street motor That is if they piston maker doesn't want the top ring wider to start with than .022 like most Hypertutic pistons want I found out the hard way a long time ago that having some clearances a tiny bit to tight is way worst than having them .001 to .006 to big, especially ring gaps on pump gas street motors IHTHs Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: how is too much top ring end gap [Re: roadrunnerreds] #1749885 02/09/15 02:48 AM 02/09/15 02:48 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: I'm in the process of assembling short block 318-390 stroker and my file fit ring for the top ring is at .022 i was going to make gap .017. Second ring is .012. When i used speed pro rings in 360 i made ring gaps. .018 top ring .020 second. Hard to get rings for this set up. Thanks Bradley .005 isnt gonna kill ya... granted its a bit more than called for... I have been running the second ring larger than the top.. which seems to be a trend the last few years.. reason why is, if it got past the top ring dont hold it in there to cause both rings to flutter

Re: how is too much top ring end gap [Re: MR_P_BODY] #1749886 02/09/15 07:41 AM 02/09/15 07:41 AM
Joined: Jan 2003 Posts: 499 Gettysburg Pa R roadrunnerreds OP mopar
roadrunnerreds OP mopar R Joined: Jan 2003 Posts: 499 Gettysburg Pa	They are diamond flat top pistons on scat i beam rod mopar 4.00 stroke cast crank.yes it will be pump gas engine. Yes i noticed speed pro wanted bigger second ring gap but total seal wants bore x.0035. Thanks guys appreciate it

Re: how is too much top ring end gap [Re: roadrunnerreds] #1749887 02/09/15 03:54 PM 02/09/15 03:54 PM
Joined: Aug 2003 Posts: 43,309 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,309 Bend,OR USA	Quote: They are diamond flat top pistons on scat i beam rod mopar 4.00 stroke cast crank.yes it will be pump gas engine. Yes i noticed speed pro wanted bigger second ring gap but total seal wants bore x.0035. Thanks guys appreciate it Speed Pro has been advicing the larger gap on the second ring for some time, Total Seal probally needs to update thier instructions instead of using the original one from back in the 1970s I use the .0048 per inch of bore formula for the top rings on most pistons with no power adders and .0050/.0053 for the second ring gap Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: how is too much top ring end gap [Re: Cab_Burge] #1749888 02/09/15 04:33 PM 02/09/15 04:33 PM
Joined: Jan 2005 Posts: 12,424 Kalispell Mt. H HotRodDave I Live Here
HotRodDave I Live Here H Joined: Jan 2005 Posts: 12,424 Kalispell Mt.	I run them the same, I figure the top one will get hotter and have a tighter gap once it is running. I am not causing global warming, I am just trying to hold off a impending Ice Age!

Re: how is too much top ring end gap [Re: HotRodDave] #1749889 02/09/15 07:08 PM 02/09/15 07:08 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	A set of 4.000 rings would probably allow you to file fit to your heart's content, although with total seal rings it shouldn't be so critical, right? Years ago I found a set of 0.25mm OS rings for a Toyota landcruiser, almost exactly 0.004" OS, nice file-fit was obtained. R.

Re: how is too much top ring end gap [Re: dogdays] #1749890 02/09/15 10:47 PM 02/09/15 10:47 PM
Joined: Mar 2006 Posts: 9,883 MI, usa dvw master
dvw master Joined: Mar 2006 Posts: 9,883 MI, usa	Ring gap is overrated. Educate yourself here. This is just one of many articles on the subject http://www.diagnosticengineers.org/journal_%20articles/Ring%20Gaps%20vs%20Knowledge%20Gaps.php Cylinder wall finish/ring seal is where the power lies. Doug

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