Piston to Wall Clearance - Dodge Cummins Diesel Forum
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post #1 of 4 (permalink) Old 01-31-2012, 09:28 PM Thread Starter
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Piston to Wall Clearance

I am in the process of rebuilding my 12v and was wondering if it would be alright to run extra piston to wall clearance if i am only planing on 400-450hp. I know that this is a common thing to do to high horse engines but am unsure if it is a good idea with only moderate hp increase. As I understand it, the amount of boost you are pushing plays a big role in how much extra clearance to bore for. How much boost would I need to make to still get the proper ring pressure? Currently my bores are sitting towards the high end of spec and I was planing on using standard sized pistons. I guess the biggest thing that I am concerned about is having too much clearance and then having a ton of blow by.

Any advise is appreciated


1995 2500 RCLB, Complete Overhaul at 268k, 4K GSK, 2095 Rack plug, AFC Tuning, 60HP Tork Tek OFV, AirDog DF 100, DDP Stage 2 Injectors, Colt Cam Stage 3, O- Ringed Head, ARP Head Studs, ARP Main Studs, S300GX, BHAF, 5 Speed Swap, South Bend DD, 3.54's, KDP, 17* Timing
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post #2 of 4 (permalink) Old 02-01-2012, 11:23 AM
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meh... slap it together and run it.... least you dont gotta worry about a loose motor blowing up on ya...

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post #3 of 4 (permalink) Old 02-01-2012, 01:30 PM
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What does the bore measure? front to back & side to side , do it at the top and bottom. the most important thing is round and straight. If you can hone it with a ridged hone and make it round in the same .002. So if the smallest is 4.016 and the largest is .018 hone it to .018 The .002 side clearance wont matter and the rings will like the bore better.


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post #4 of 4 (permalink) Old 02-01-2012, 09:09 PM Thread Starter
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The bores are within .0005 roundness so i am not concerned with that the only thing wrong with the bores is there is a ridge worn by the rings. I might try just honing till that disappears- probably only .001 bigger than spec.

1995 2500 RCLB, Complete Overhaul at 268k, 4K GSK, 2095 Rack plug, AFC Tuning, 60HP Tork Tek OFV, AirDog DF 100, DDP Stage 2 Injectors, Colt Cam Stage 3, O- Ringed Head, ARP Head Studs, ARP Main Studs, S300GX, BHAF, 5 Speed Swap, South Bend DD, 3.54's, KDP, 17* Timing
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