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07-11-2019, 11:25 AM
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#1
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Name: SCHMITTY
Title: Not enough time
Status: Not Here
Join Date: Jun 2012
Location: K beach, AK
Member`s Gallery
Posts: 1,183
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Should I run a wider gap on the top ring than the 2nd ring ?
I’m seeing that people run the top ring tighter than the 2nd and the other way around.
What would you guys recommend for a .020 over block that’s going to be driven by an older guy ? Just a cruiser 5 speed power wagon, 5x12s, 4k springs, ats3000
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stock 94
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07-11-2019, 12:11 PM
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#2
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Name: Rich dzl
Title: 12v guru
Status: Not Here
Join Date: Mar 2011
Member`s Gallery
Posts: 741
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i have ran oem Cummins rings several different ways long as cyl. walls are good they will seal .. long as gap is in Cummins spec run it
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07-18-2019, 09:39 AM
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#3
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Name: Destroked 450
Title: Too Much Time
Status: Not Here
Join Date: Mar 2015
Location: Harned,Ky.
Member`s Gallery
Posts: 340
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Cummins recommends around .006 more gap for top ring than 2nd
.016-.028 top
.010-.022 intermediate (2nd)
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Mine: 04 F-450 sc 4x4 fb drw 5.9 12v 215 ppump, zf6, kdp fixed, 3k gsk, AFC Live, super b single, pusher intake, d-celerator ebrake
Hers:2018 F-150 sc 4x4 5.0
Farm trucks: 01 Z71 ext cab, 95 S10, 93 F-800 8.3 Cummins, 87 AM General 5 ton
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07-18-2019, 12:00 PM
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#4
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Name: SCHMITTY
Title: Not enough time
Status: Not Here
Join Date: Jun 2012
Location: K beach, AK
Member`s Gallery
Posts: 1,183
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Perfect. That’s what I did the oil rings got filed into the upper teens. Trying to locate a better piston ring compressor than my old school one
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stock 94
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07-18-2019, 03:06 PM
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#5
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Name: Destroked 450
Title: Too Much Time
Status: Not Here
Join Date: Mar 2015
Location: Harned,Ky.
Member`s Gallery
Posts: 340
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I bought one of these years ago, after a few uses I threw my old band type away.
Don't do enough engine work to justify the cost of the tapered type.
__________________
Mine: 04 F-450 sc 4x4 fb drw 5.9 12v 215 ppump, zf6, kdp fixed, 3k gsk, AFC Live, super b single, pusher intake, d-celerator ebrake
Hers:2018 F-150 sc 4x4 5.0
Farm trucks: 01 Z71 ext cab, 95 S10, 93 F-800 8.3 Cummins, 87 AM General 5 ton
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07-18-2019, 06:32 PM
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#6
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,412
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Stay on the loose side of spec, even over. And run ptw on the loose side if that's still an option. Just makes these things so much more reliable if the old dude ever runs it hard and hot. Being a power wagon I assume some kind of toy
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07-18-2019, 06:54 PM
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#7
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Name: SCHMITTY
Title: Not enough time
Status: Not Here
Join Date: Jun 2012
Location: K beach, AK
Member`s Gallery
Posts: 1,183
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The machine shop I use sold me an adjustable tapered ring compressor for 35$
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stock 94
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07-18-2019, 07:39 PM
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#8
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Name: SCHMITTY
Title: Not enough time
Status: Not Here
Join Date: Jun 2012
Location: K beach, AK
Member`s Gallery
Posts: 1,183
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Quote:
Originally Posted by jasonc
Stay on the loose side of spec, even over. And run ptw on the loose side if that's still an option. Just makes these things so much more reliable if the old dude ever runs it hard and hot. Being a power wagon I assume some kind of toy
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It’s a toy / car show rig. The ptw might be a little looser than .005 but not much.
The top ring is mid to upper 20s , the 2nd ring is lower 20s and the oil ring is upper teens.
His main concern is zero leaks and not smoking at idle lol
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stock 94
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