Good info! In the process of putting a 5.9 CR together and noticed the PTW was only .004. I'm taking it back to the machine shop on Monday to loosen it up to .006 and .0065 on 1 & 6. Tow with it mostly up mountain grades. When I tore it down, compression ring on 1 & 6 were broken in half.
On our blown alcohol engines we have typically run 0.0015”-0.002”/inch of bore diameter. This is a steel block, aluminum piston. And we have data logging with light indicators that help keep us below 1,400 degrees EGTS. I would think this would also work in a diesel as well if you were planning to run a setup with good air and kept your temps down. And then like you mentioned once you start to make more heat then you would be running as much as 0.003”0.004”/inch of bore. Then for ring gap we are in that .008”/inch bore range, making 30psi boost. Again we try to stay below 1,400 degrees, but we have had a couple times where we have hit 1,700+ and tulipped valves and melted pistons, but the rings and ring lands were fine.
@@CUTTERUPROB it should be fine. 6.7 std bore is 4.210 so at .0015”/inch you would be 0.0063” ptw and at .002”/inch you would be 0.0084” ptw. The biggest benefit we have is we only run around 10.1:1-10.3:1 compression instead of the 16.9:1 or even 19:1 that diesels do. I would love to do an in cylinder pressure comparison from a 2,000hp alcohol engine to a 2,000hp diesel.
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Good info! In the process of putting a 5.9 CR together and noticed the PTW was only .004. I'm taking it back to the machine shop on Monday to loosen it up to .006 and .0065 on 1 & 6. Tow with it mostly up mountain grades. When I tore it down, compression ring on 1 & 6 were broken in half.
On our blown alcohol engines we have typically run 0.0015”-0.002”/inch of bore diameter. This is a steel block, aluminum piston. And we have data logging with light indicators that help keep us below 1,400 degrees EGTS. I would think this would also work in a diesel as well if you were planning to run a setup with good air and kept your temps down. And then like you mentioned once you start to make more heat then you would be running as much as 0.003”0.004”/inch of bore.
Then for ring gap we are in that .008”/inch bore range, making 30psi boost. Again we try to stay below 1,400 degrees, but we have had a couple times where we have hit 1,700+ and tulipped valves and melted pistons, but the rings and ring lands were fine.
I am not familiar with the blown alcohol stuff but i know if you run cummins that tight you will have some issues. might has to do with the alcohol
@@CUTTERUPROB it should be fine. 6.7 std bore is 4.210 so at .0015”/inch you would be 0.0063” ptw and at .002”/inch you would be 0.0084” ptw. The biggest benefit we have is we only run around 10.1:1-10.3:1 compression instead of the 16.9:1 or even 19:1 that diesels do. I would love to do an in cylinder pressure comparison from a 2,000hp alcohol engine to a 2,000hp diesel.
Awesome video
A lot of good info 👌
Thanks buddy
What ring gap would you run with a 600hp compound turbo set up?
high end of stock specs
If you have 40 over can i go with stock ring gaps size?
If your staying in stock power range yep.
You you want to turn it up just go to big end of factory specs
How come you don't use a steel piston or a steel dome and aluminum skirt
You can do a steel piston in the 305/325hp 5.9 Cummins. But no one offers a steel pistons for a 12v or a 6.7 ( that I know of )