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04-16-2007, 07:30 PM
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#21
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Name: bdp
Title: beans diesel performance
Status: Not Here
Join Date: Apr 2006
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Posts: 1,730
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A low cr like 12 or 13:1 will need somthing to make up for the loss like 100+psi of boost or lots of nitrous. The lower comp will help with pressures but will make the engine less effecient IMO without alot of boost to bring back the ratio on the top end. I have seen engines like this that never stop white smoking with about 12:1 cr and a single turbo. Even at WOT at the end of the pullin track its got a white/dark grey mix in the smoke, to me thats just not gonna make good power.
I would keep it up in the 16:1 range for a street driver, just IMO.
__________________
www.beansdieselperformance.com
The Smokin' Hot Hooker- 2002 F350-6.7 CRD Sponsored by South Bend Clutch, Woodruff Diesel, Floor It Diesel
bdp Drag Truck- 81 C10 5.9 bdp built- Sponsors-Arrow Engine Machine, BTS Transmissions, Snow Performance, NX, Carrilo Rods, Mahle Pistons
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04-17-2007, 07:02 AM
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#22
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Name: Graphic Man
Title: Too Much Time
Status: Not Here
Join Date: Aug 2006
Location: Mississauga Ont. canada
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Posts: 963
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CC the top of a piston, gasket thickness and deck height and it will soon tell you what you will have for C/R
Scott
__________________
08 Mega cab
SOLD01 Ram sport 4X4, Monster VP , some big injectors, full billet DTT, and big twins etc. etc.
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01-20-2010, 08:26 PM
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#23
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Name: fordcummins
Title: Showoff
Status: Not Here
Join Date: Jun 2006
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Posts: 981
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mine are 15.1 and its a big big pain in the a$$ to start when its cold
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01-22-2010, 07:29 PM
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#24
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Name: markt
Title: Rookie
Status: Not Here
Join Date: Jul 2006
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Posts: 26
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What temperature are y'all calling "cold"?
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01-30-2010, 11:42 AM
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#25
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Name: Crawler
Title: Press the BIG RED button.
Status: Not Here
Join Date: Apr 2006
Location: NE Texas
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Posts: 837
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Holly revived thread Batman!
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01-30-2010, 12:57 PM
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#26
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Name: daithi2
Title: Nevermore
Status: Not Here
Join Date: Aug 2008
Location: Amarillo, Tx
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Posts: 607
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01-30-2010, 05:41 PM
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#27
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Name: PRINCETON_JAKE
Title: Too Much Time
Status: Not Here
Join Date: Jan 2010
Location: Princeton Minnesota
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Posts: 1,125
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How low of compression ratio can you go on a diesel? I have a friend with a pulling truck that says the c.r. of his truck is under 9 to 1. it is a heavily built motor that requires starting fluid unless its 100 degrees out side.
__________________
silver 2006 ram 2500 4x4, crew cab short box, 48RE auto with "stuff" done, 5.9 with more "stuff" done
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01-30-2010, 06:36 PM
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#28
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Name: Jim Fulmer
Title: Too Much Time
Status: Not Here
Join Date: May 2006
Location: Quanah Tx.
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Posts: 5,013
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Quote:
Originally Posted by Crawler
Holly revived thread Batman!
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Were have you been hiding at?
Jim
__________________
01' 12V, S/B, Q/C, 4WD
98' 12V, S/B, Q/C, 2WD
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01-31-2010, 03:16 PM
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#29
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Name: COMP461
Title: Comp Diesel Sponsor
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Join Date: Apr 2006
Location: Aledo
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Posts: 4,009
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There are many variables, I'm going the other way on a high Dollar 2.6 build up. Around 17.5 static, but there is a lot more to it, such as cam timing and intake runners. You also can run a dramatic amount more compression with a Common rail engine. The common rail has the ability to limit power as the engine goes through the destructive peak torque part of the power curve.
I am adding 20 degrees to the intake-closing event
The cam will have a 115 intake lobe center line, and a 125 lobe separation angle, along with a .450 lobe lift
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02-07-2010, 09:07 AM
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#30
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Name: 99Binder
Title: Diesel Enthusiast
Status: Not Here
Join Date: Sep 2006
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Posts: 202
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i know more tractor pullers (at the 3.0 inch) are sticking with a closer to stock compression ratio
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Cummin Gitcha Sum
"Im spittin in your face cause im a dominating you" -Hank 3
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02-07-2010, 10:52 AM
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#31
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Name: Dalpilot
Title: Joe Nobody!
Status: Not Here
Join Date: Apr 2006
Location: Austin, Texas
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Posts: 11,373
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I'm right at 16.5 : 1.
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2017 White f-250 COMPETITIONDIESEL.COM Bringing the best together
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02-09-2010, 09:58 PM
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#32
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Name: BigDamnCummins
Title: Diesel Enthusiast
Status: Not Here
Join Date: Jan 2010
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Posts: 110
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Somewhere in the 18 to 19:1 range for my cr!
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02-18-2010, 10:27 PM
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#33
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Name: BigDamnCummins
Title: Diesel Enthusiast
Status: Not Here
Join Date: Jan 2010
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Posts: 110
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18.6:1 to be exact, and somewhere between 850 and 900rwhp with a 2.6 inlet.
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02-19-2010, 05:50 PM
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#34
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Name: pwrstrokenstang
Title: oil burner pulling team
Status: Not Here
Join Date: Mar 2009
Location: staunton, va
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Posts: 355
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my new motor will be 15:1.
__________________
'96 F-250- just another 2.6 7.3l turd with way too much money under the hood.
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02-19-2010, 09:53 PM
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#35
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Name: CR785
Title: Too Much Time
Status: Not Here
Join Date: Jan 2008
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Posts: 302
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I dont know why some people would want the 12 13 or 14:1 for dd vehicles, i run 12:1 in my 3.0 truck, i struggle each and everytime to start that thing, plus a street ruck isnt going to need that much relief, cause you arent going to be making that much power. I would go no lower that 15:1 on the street, and at that i would think that cold weather starting would be hard sometimes, i think you are on the right track, being aroun 16 16.5:1.
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02-20-2010, 10:36 AM
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#36
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Name: BigDamnCummins
Title: Diesel Enthusiast
Status: Not Here
Join Date: Jan 2010
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Posts: 110
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Is 16.5:1 to low for a motor that runs down the track at 3300rpm?
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02-20-2010, 04:52 PM
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#37
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Name: COMP461
Title: Comp Diesel Sponsor
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Join Date: Apr 2006
Location: Aledo
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Posts: 4,009
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you need to turn it harder the 3300
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02-20-2010, 05:04 PM
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#38
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Name: smokin1997
Title: I Know Nothing
Status: Not Here
Join Date: Dec 2007
Location: Idaho
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Posts: 899
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around 14.5:1 on a 12v 3.0 puller
let it sit for a week, or if it gets below 60* overnight, it needs a little assistance to start.
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'12 Dodge 6.7 g56. Deleted and tuned
1997 Dodge Super Street puller "Never Ending" SOLD
TurboPerformanceProducts.com
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02-20-2010, 05:57 PM
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#39
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Name: daithi2
Title: Nevermore
Status: Not Here
Join Date: Aug 2008
Location: Amarillo, Tx
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Posts: 607
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15/1 on my 12v with 13mm and II race twins. its damn hard to start in cold weather no heater grid and no fuel warmer. It hazes no matter what.
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02-20-2010, 06:10 PM
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#40
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Name: dieseljunky2500
Title: Rookie
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Join Date: Feb 2010
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Posts: 5
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compression ratio in hot motors really varies with boost. i am running 40 lbs on stock compression. i would start to lower after 55 to 60 lbs, but not a whole lot.
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