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 02-17-2017, 11:42 AM
Blackmax123 Blackmax123 is offline
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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
Mark06 Mark06 is offline
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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 02-18-2017, 02:05 PM
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Not to go against the grain but my build wound up with 14/1 forged Arias cause I got some good deals on here for the Pistons , cam , lifters and several other parts from a member that was getting out of the sport. Flirting With Disaster had sold him all the parts I believe . I was a little concerned at first but once I had it all together and running I can say I am very happy with the results . It's very responsive and pulls extremely hard . The only thing I notice is that the engine needs to come to operating temperature in order for it to run its best . It has a white smoke haze till it warms up a bit then it's clean . Tune 1 is clean driving thanks to Mark Broviak. I'm doing 3.42 gears in it in the next month or so to see if I can get it deeper into the 9s on fuel only . Best time to date was on Tune 4 spinning a bit out of the hole . Gentleman at FWD said the lower compression would allow for a better air charge .
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[B][U][COLOR="Red"][FONT06 GMC Sierra RC Full built motor, carillos, 14/1 Arias W/total seal rings, 9100 AF, SCalTit retainers,SCalsprings,ported heads, SCal pushrods, ARP 625 head studs, O-ringed block, keyed oil pump ,Billet Aluminum Lifters, Harland Sharp Aluminum roller rockers, studded rocker shafts, studded & girdled mains, socal balancer, socal flywheel, PPE Dual Fuelers with twin Fleece 10 mm CP3s , FASS Titanium 260 , 3" bridge, , TrRIPLES----2---S369SXEs .88ARs over a Hybrid GTX 4202R--72mm/87mm 1.0 AR Turbonetics 50mm wastegate ,coilovers at 4 corners, 36" ladder bars, BD cooler, Exergys w/185% MS 8 hole nozzles ,FF Dynamics fans, PPE mans & ups , MA mounts & TC Brace ,NOS, Full Billet Trans, Goerend LL 3200, BT lockup box, 18x9 Raceline Assualts Hooiser Drag Radials 325/45/18s TUNED by MARK@DANVILLE. Engine by Jason Walker San Marcus Tx Best 60'---1.44. Best 1/8---6.39@105.92. Best 1/4---9.978@136.39
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Old 02-18-2017, 02:46 PM
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I think the forged pistons expand more when getting to operating temp than cast do. I noticed also that my motor with Mahle forged pistons run cleaner when pistons warm up a little.
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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 02-18-2017, 03:45 PM
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Zap your 100% correct .
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[B][U][COLOR="Red"][FONT06 GMC Sierra RC Full built motor, carillos, 14/1 Arias W/total seal rings, 9100 AF, SCalTit retainers,SCalsprings,ported heads, SCal pushrods, ARP 625 head studs, O-ringed block, keyed oil pump ,Billet Aluminum Lifters, Harland Sharp Aluminum roller rockers, studded rocker shafts, studded & girdled mains, socal balancer, socal flywheel, PPE Dual Fuelers with twin Fleece 10 mm CP3s , FASS Titanium 260 , 3" bridge, , TrRIPLES----2---S369SXEs .88ARs over a Hybrid GTX 4202R--72mm/87mm 1.0 AR Turbonetics 50mm wastegate ,coilovers at 4 corners, 36" ladder bars, BD cooler, Exergys w/185% MS 8 hole nozzles ,FF Dynamics fans, PPE mans & ups , MA mounts & TC Brace ,NOS, Full Billet Trans, Goerend LL 3200, BT lockup box, 18x9 Raceline Assualts Hooiser Drag Radials 325/45/18s TUNED by MARK@DANVILLE. Engine by Jason Walker San Marcus Tx Best 60'---1.44. Best 1/8---6.39@105.92. Best 1/4---9.978@136.39
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