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Dodge Competition and Performance General Dodge Competition and Performance Discussion |
02-04-2010, 08:36 AM
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#1
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Name: railhor5.9
Title: cummins racer
Status: Not Here
Join Date: Mar 2009
Location: rio vista tx
Member`s Gallery
Posts: 95
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piston ring end gap?
my buddies are building there motors one a 12 valve and the other a common rail, on the 12v we cant move the piston side to side in the block its real tight. on the common rail we can move the pistons a lil. i pulled the #3 piston out and took the rings off and put them in the cylinder 1 inch down, they all have around 20 thousands end gap. just wondering what the specs were on the cr. and if i am suppost to be able to move the piston around. the cr has std pistons and the machine shop said the bores were still std, but they dont feel right. just seems like there would be some piston slap the way they are.
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1993 single cab short bed! D250, 175 P-PUMP,5X14's, BHAF, 4KGSK,SBC,FASS. mack plug. 26* timing, mahle 155*
1997 2500 4x4, 913 pump, DD
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02-04-2010, 11:32 AM
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#2
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Name: brushpuller
Title: Thinkin...
Status: Not Here
Join Date: Nov 2008
Location: Indiana
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Posts: 630
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Anyone using gapless rings?
__________________
When in doubt....pull it out!!!
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02-04-2010, 01:09 PM
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#3
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Name: cbtoyz
Title: Vaginatarian
Status: Not Here
Join Date: Apr 2008
Location: Fortuna, Ca
Member`s Gallery
Posts: 1,396
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I know of a guy in Oregon who uses total seal rings for the upper rings. Keeps blow by down and your oil clean, I'm not entirely sold on the idea though. He's not much of a hot rodder, just rebuilds motor homes and such.
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Colin. 2wd 12 valve Pro Street 9.88 @ 140mph sold.
Ponci's Diesel Center
(707) 725-3307
Goerend Transmissions Inc.
(563) 778-2719
Hamilton Cams
(512) 778-9418
Dynomite Diesel Products Inc.
(360) 794-5732
...
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02-04-2010, 01:26 PM
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#4
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Name: mondtster
Title: Too Much Time
Status: Not Here
Join Date: Jan 2009
Location: k74
Member`s Gallery
Posts: 1,206
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Why aren't you sold on the idea of a gapless ring?
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02-04-2010, 01:46 PM
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#5
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Name: cbtoyz
Title: Vaginatarian
Status: Not Here
Join Date: Apr 2008
Location: Fortuna, Ca
Member`s Gallery
Posts: 1,396
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Having the extra cylinder pressure should increase hp but how do they expand when they get hot? How loose would you run the piston to cylinder tolerances with those? I wasn't comfortable not knowing the answers to those questions and how they would handle the heat. Maybe I'll try them on my next build, but for now, I just opted for the old fashioned Mahle/Cummins rings.
Out of curiosity, what are your thoughts on them?
__________________
Colin. 2wd 12 valve Pro Street 9.88 @ 140mph sold.
Ponci's Diesel Center
(707) 725-3307
Goerend Transmissions Inc.
(563) 778-2719
Hamilton Cams
(512) 778-9418
Dynomite Diesel Products Inc.
(360) 794-5732
...
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02-04-2010, 02:29 PM
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#6
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Name: Bponci
Title: rookie
Status: Not Here
Join Date: Sep 2006
Location: fortuna
Member`s Gallery
Posts: 2,160
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You would be surprised what stock stuff will do.
__________________
2002 dodge 2500 auto (tow rig)
S10 with a little turbocharged/procharged 12 valve 9.22@157mph
23t altered 12v compounded fuel only 8.30s@166mph
Daughter with a badass 1st gen 12mm VE 11.64@117mph
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02-04-2010, 02:31 PM
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#7
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Name: mondtster
Title: Too Much Time
Status: Not Here
Join Date: Jan 2009
Location: k74
Member`s Gallery
Posts: 1,206
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Quote:
Originally Posted by cbtoyz
Having the extra cylinder pressure should increase hp but how do they expand when they get hot? How loose would you run the piston to cylinder tolerances with those? I wasn't comfortable not knowing the answers to those questions and how they would handle the heat. Maybe I'll try them on my next build, but for now, I just opted for the old fashioned Mahle/Cummins rings.
Out of curiosity, what are your thoughts on them?
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There is room for expansion. At the end of the ring, the thickness goes to half of the total thickness and then overlaps the other end that way. That’s what I found when doing a bit of research on the subject at least.
I don't think piston to cylinder wall clearance would need to be changed to run them either.
I’ve looked into running them in a few different turbo gasoline engine applications, cost caused me to steer clear of them. I don’t think there would be any problems running them as long as the area for expansion was there, just like you would need some area for expansion on a standard style ring.
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02-04-2010, 02:36 PM
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#8
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Name: BigYellowIron
Title: Diesel Tech
Status: Not Here
Join Date: Aug 2007
Location: West Missouri
Member`s Gallery
Posts: 1,400
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I thought on the diesel application the total seals were for the second ring.
__________________
2005 quad cab shortbed 6 spd
95 5 speed
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02-04-2010, 06:11 PM
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#9
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Name: brushpuller
Title: Thinkin...
Status: Not Here
Join Date: Nov 2008
Location: Indiana
Member`s Gallery
Posts: 630
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I realy don't think the gapless rings would be much for a DD or mild performance, but in an all out race only rig...you bet it will be an advantage!!!
__________________
When in doubt....pull it out!!!
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04-07-2010, 02:33 PM
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#10
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Name: stubz616
Title: Too Much Time
Status: Not Here
Join Date: Oct 2008
Location: Brewster, MA
Member`s Gallery
Posts: 1,327
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i looked into the total seal rings for my rebuild but i think ill just be using the regular rings for my truck since its just a DD and occasional weekend racer. if i was building an all out race rig, i would go with the total seals though.
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95 RCLB Farrell Diesel Stage 5 13mm pump,Hamilton Springs,Retainers,Pushrods,Fluidampr,Steed Speed,S467.7/soon to be S488 atmo,Full Billet Trans,DPC 4 disk TC,BD Pressure Loc,Haley Speed 5x.022s,Diesel Pros Custom Cam,O-Ringed,.010 over HG,A1000,Hellman sump,625 Studs, 30*
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