Duramax Diesels Forum Truck of the Week
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Old 02-17-2017, 08:45 AM
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Default Compression ratio

What's everyone's thoughts on compression ratios for a full blown sled pulling engine dedicated puller. Been doing lots of research this topic seems to be lots of mixed answers. Some say high compression is free horse power but hard on parts others say stay low and run more boost. I know statics and dynamic compression ratio play a big part in this. I was thinking 15:1 would be good. Open to suggestions
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Old 02-17-2017, 09:34 AM
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I would say since it's a dedicated pull truck and you'll be limited by turbo I would run high compression.
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Old 02-17-2017, 09:45 AM
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I like em higher also. 16:1 is lowest I've gone so far.

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Old 02-17-2017, 10:04 AM
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What class?


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Old 02-17-2017, 11:25 AM
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its a 2.8" class I run a gt55 bushed down charger bushed down.
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Old 02-18-2017, 02:49 PM
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Quote:
Originally Posted by Frankin_truck View Post
its a 2.8" class I run a gt55 bushed down charger bushed down.
No protrusion required? Does the bushing need to be against comp wheel?
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Old 02-26-2017, 06:06 PM
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Quote:
Originally Posted by 04jimc View Post
No protrusion required? Does the bushing need to be against comp wheel?
Sorry I forgot about this. My turbo is protrusion style with a Forward facing map groove
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Old 02-26-2017, 06:33 PM
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Quote:
Originally Posted by Frankin_truck View Post
Sorry I forgot about this. My turbo is protrusion style with a Forward facing map groove
I see. Still would make good power being clipped

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Old 02-17-2017, 11:42 AM
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Mine is 15.5:1. That's what Mark Brovaik recommend when I built my motor. I did loose 40hp gained a little torque over my stock motor with air and fuel the same. That's was also with a stock appearing Danville 2.5 vgt charger.

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Old 02-17-2017, 11:58 AM
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15:1 would give you most reliability at high boost levels.
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Old 02-17-2017, 01:56 PM
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Talked to a few reputable people in the duramax community 15-16:1 seems to be the general consensus. Turbo size seems to have a lot to do with
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Old 02-17-2017, 04:04 PM
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I run 16.5:1 with around 85-90#'s boost from the triples. Blew headgaskets with standard H11 studs. Went to 625's and Oring heads, no problems for the last 10k miles
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Old 02-17-2017, 06:33 PM
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Quote:
Originally Posted by Harbin_22 View Post
I run 16.5:1 with around 85-90#'s boost from the triples. Blew headgaskets with standard H11 studs. Went to 625's and Oring heads, no problems for the last 10k miles
How do you fit those in your pants??
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Old 02-17-2017, 08:28 PM
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Quote:
Originally Posted by Dan@PPE View Post
How do you fit those in your pants??
Haha, I honestly just beat on it all the time and hope for the best lol. This motor has made it a rough 15k miles and still going strong.
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Old 02-27-2017, 05:32 PM
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Quote:
Originally Posted by Harbin_22 View Post
I run 16.5:1 with around 85-90#'s boost from the triples. Blew headgaskets with standard H11 studs. Went to 625's and Oring heads, no problems for the last 10k miles
Great just what I wanted to read. same comp, same boost levels, didn't do the 625's fml.
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