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09-16-2013, 10:12 PM
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#61
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Name: John Robinson
Title: Too Much Time
Status: Not Here
Join Date: Dec 2006
Location: Weatherford, Tx.
Member`s Gallery
Posts: 2,384
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John , I would love to see You put a stock cam back in & see what happens ... that's he only real way to clear this up .
__________________
"Ask any American Indian what will happen to this country if we dont control immigration."
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09-16-2013, 10:16 PM
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#62
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Name: 6.4 F-350
Title: Too Much Time
Status: Not Here
Join Date: Jan 2012
Location: Sandstone MN
Member`s Gallery
Posts: 1,730
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A picture is worth a thousand words IMHO. I guess a screen shot in this case.
__________________
2012 Mega cab almost bone stock. 
2008 F-350 Sold
Spartan AFE
1998 Dodge someday pullin truck 
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09-16-2013, 11:08 PM
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#63
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Name: WUnderwood
Title: CompD Minion
Status: Not Here
Join Date: Aug 2006
Location: Texas
Member`s Gallery
Posts: 8,418
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Quote:
Originally Posted by John Robinson
John , I would love to see You put a stock cam back in & see what happens ... that's he only real way to clear this up .
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X 2
So the Megatron truck is the only one that making power, Greg? I thought you sold a chit load?
__________________
2011 Ford F-150 Lariat 4X4
RIP BFD99, jponder, and Forrest Nearing
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09-16-2013, 11:35 PM
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#64
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Name: 97dawg
Title: Diesel Enthusiast
Status: Not Here
Join Date: Mar 2007
Member`s Gallery
Posts: 105
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Quote:
Originally Posted by dansdieselp
I just go by what I'm told. If the owner doesn't know what he has I ask the source. Now I'm not going to get into this pissing match, but I will state what I believe. I have Greg's cam in my truck and it makes peak power at 4000rpm and carries it way out to the right side on the graph. It's a 2.6 Duramax so it's not gonna respond the same as a Cummins with the same grind IMO. I like it and won't give this one up. Now when we are looking at four different trucks running into the same problem you have to look at what they have in common. Jason's truck ran awesome last year. Made a few changes over winter and lost all bottom end power. You figure a better head and charger aren't going to hurt ya much so went back to old injectors. Helped, but not enough. Went back to smaller cam and runs like it did last year. So the cam was the culprit. Now does this make the other cam junk? I don't think so, but I believe that it's too big for a 2.6 truck. The best 2.6 charger is only going to flow so many pounds of air per minute and it can't feed these cams where they want to make power. So now you're driving the charger harder and heating up the air more. Also air is moving faster and spending less time in the intercooler. In the logs I'm seeing intake manifold temps in the 180-250*+ range at end of run. I think these Cummins cams would work better in a big twin setup or drag racing motor. The theory of keeping the intake valve open after BDC is not a bad one. If boost pressure is higher than cylinder pressure as piston is coming up air is still flowing in. More air in will equal more power. Hot air however is gonna kill it though. Sometimes less is more. That is all for now. |
You're not supposed to actually use your brain or put an intelligent post on this thread. I don't claim to be a pro n I know theory doesn't always translate into reality but your logic makes perfect sense.
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09-17-2013, 05:22 AM
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#65
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Name: Valair1
Title: Valair Inc. Clutch
Status: Not Here
Join Date: Jul 2008
Location: Crowley Texas
Member`s Gallery
Posts: 2,498
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Here is what my 12v had for a cam
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09-17-2013, 05:54 AM
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#66
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Name: zstroken
Title: For $$$ your name here
Status: Not Here
Join Date: Sep 2006
Location: Western Michigan(by the lake)
Member`s Gallery
Posts: 23,151
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Quote:
Originally Posted by Valair1
Here is what my 12v had for a cam
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That looks like it is upside down. 
__________________
2008 4x4 Megacab, 68RFE
97 Dodge gone....
24V P-Pump Mafia member #1(retired)
Thanks to Mumau Diesel, Goerend Transmission, Northeast Diesel Service!
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09-17-2013, 07:11 AM
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#67
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Name: THATpreston
Title: Brush your teeth.
Status: Not Here
Join Date: Apr 2006
Location: In a van down by the river...
Member`s Gallery
Posts: 5,179
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Quote:
Originally Posted by zstroken
That looks like it is upside down. |
The cam came from Australia.
__________________
http://www.keatingmachine.com
2006 Dodge Mega Cab Dually - "MOBYDK"
Diesel Performance Converters ~ Pro Street Diesel ~ MCN Diesel
CompD Mod White Dodge Club, member #1.
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09-17-2013, 07:44 AM
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#68
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Name: Craig_C
Title: Resident Smartass
Status: Not Here
Join Date: Apr 2010
Location: Corydon, IN
Member`s Gallery
Posts: 1,714
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Quote:
Originally Posted by dansdieselp
I just go by what I'm told. If the owner doesn't know what he has I ask the source. Now I'm not going to get into this pissing match, but I will state what I believe. I have Greg's cam in my truck and it makes peak power at 4000rpm and carries it way out to the right side on the graph. It's a 2.6 Duramax so it's not gonna respond the same as a Cummins with the same grind IMO. I like it and won't give this one up. Now when we are looking at four different trucks running into the same problem you have to look at what they have in common. Jason's truck ran awesome last year. Made a few changes over winter and lost all bottom end power. You figure a better head and charger aren't going to hurt ya much so went back to old injectors. Helped, but not enough. Went back to smaller cam and runs like it did last year. So the cam was the culprit. Now does this make the other cam junk? I don't think so, but I believe that it's too big for a 2.6 truck. The best 2.6 charger is only going to flow so many pounds of air per minute and it can't feed these cams where they want to make power. So now you're driving the charger harder and heating up the air more. Also air is moving faster and spending less time in the intercooler. In the logs I'm seeing intake manifold temps in the 180-250*+ range at end of run. I think these Cummins cams would work better in a big twin setup or drag racing motor. The theory of keeping the intake valve open after BDC is not a bad one. If boost pressure is higher than cylinder pressure as piston is coming up air is still flowing in. More air in will equal more power. Hot air however is gonna kill it though. Sometimes less is more. That is all for now. |
Why cant all the diesel performance shops be this professional when it comes to this type of debate??
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09-17-2013, 09:06 AM
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#69
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Name: khaoskustoms
Title: Too Much Time
Status: Not Here
Join Date: May 2010
Member`s Gallery
Posts: 1,707
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Quote:
Originally Posted by Valair1
Here is what my 12v had for a cam
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Is that lobe lift? Or valve lift after the rockers?
__________________
94 Dakota, 4BT Twin Turbo Drag Truck
08 F450 TT12V , Tow pig
01 6.7 VP Dually, Tow pig
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09-17-2013, 09:08 AM
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#70
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Name: dansdieselp
Title: Diesel Tuner
Status: Not Here
Join Date: Aug 2009
Location: Marengo, IL
Member`s Gallery
Posts: 221
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Quote:
Originally Posted by khaoskustoms
Is that lobe lift? Or valve lift after the rockers?
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Lobe lift.
__________________
Dan's Diesel Performance
815-245-8548
EFILive tuning for 01-10 Duramax and 06-09 Cummins
www.dansdieselperformance.com
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09-17-2013, 09:11 AM
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#71
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Name: khaoskustoms
Title: Too Much Time
Status: Not Here
Join Date: May 2010
Member`s Gallery
Posts: 1,707
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Quote:
Originally Posted by dansdieselp
Lobe lift.
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That is a lot of valve lift. Can a cummins head even flow enough to take advantage of that much lift?
__________________
94 Dakota, 4BT Twin Turbo Drag Truck
08 F450 TT12V , Tow pig
01 6.7 VP Dually, Tow pig
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09-17-2013, 09:18 AM
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#72
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Name: dansdieselp
Title: Diesel Tuner
Status: Not Here
Join Date: Aug 2009
Location: Marengo, IL
Member`s Gallery
Posts: 221
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Quote:
Originally Posted by khaoskustoms
That is a lot of valve lift. Can a cummins head even flow enough to take advantage of that much lift?
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Depends how good your head flows. The more the valve is put of the way the better. At this point I think it's duration which is hurting bottom end power more than lift.
__________________
Dan's Diesel Performance
815-245-8548
EFILive tuning for 01-10 Duramax and 06-09 Cummins
www.dansdieselperformance.com
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09-17-2013, 09:19 AM
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#73
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Name: DIESEL_POWER
Title: NGM Diesel
Status: Not Here
Join Date: Jul 2006
Member`s Gallery
Posts: 5,178
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Quote:
Originally Posted by khaoskustoms
That is a lot of valve lift. Can a cummins head even flow enough to take advantage of that much lift?
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Too much lift/duration and it will drop velocity. All day every day.
__________________
Proverbs 3:5-6 (KJV)
5 Trust in the Lord with all thine heart; and lean not unto thine own understanding. 6 In all thy ways acknowledge him, and he shall direct thy paths.
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09-17-2013, 09:40 AM
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#74
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Name: khaoskustoms
Title: Too Much Time
Status: Not Here
Join Date: May 2010
Member`s Gallery
Posts: 1,707
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Quote:
Originally Posted by dansdieselp
Depends how good your head flows. The more the valve is put of the way the better. At this point I think it's duration which is hurting bottom end power more than lift.
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It might be both duration and lift. I like to spec a cam where lift matches what cylinder head can flow and duration is picked according to purpose of the engine then lowered just a little bit.
__________________
94 Dakota, 4BT Twin Turbo Drag Truck
08 F450 TT12V , Tow pig
01 6.7 VP Dually, Tow pig
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09-17-2013, 09:49 AM
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#75
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Name: young12valve
Title: teach me everything
Status: Not Here
Join Date: Sep 2010
Location: Parker,Pennsylvania
Member`s Gallery
Posts: 1,113
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that escalated quickly
__________________
Quote:
Originally Posted by jfaulkner
I can add enough fuel/timing with my laptop to show you what the insides look like.
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Quote:
Originally Posted by AHall
What kind of keyboard do you have? Better be willing to race it.
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zf6 lly Lifetime member of the Comp D COAL ORALERS
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09-17-2013, 10:34 AM
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#76
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Name: HIGH TECH RAM
Title: Haters!
Status: Not Here
Join Date: Jul 2007
Member`s Gallery
Posts: 2,857
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Ain't the first time Greg's lied wont be the last!!!!
__________________
08 3500 LMM
Compounds,40's and some other stuff
Tuned by Blackout
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09-17-2013, 10:45 AM
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#77
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Name: UNBROKEN
Title: Ezekiel 25:17
Status: Not Here
Join Date: Apr 2006
Location: TEXAS
Member`s Gallery
Posts: 17,158
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Quote:
Originally Posted by DIESEL_POWER
Too much lift/duration and it will drop velocity. All day every day.
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Thanks Captain Obvious.
__________________
I ain't got no damn diesel
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09-17-2013, 11:00 AM
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#78
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Name: TMONEYDIESEL
Title: Comp Diesel Sponsor
Status: Not Here
Join Date: Jan 2007
Member`s Gallery
Posts: 8,706
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__________________
MANNING MOTORSPORTS
Office +1 (512) 217-7644
YOUR SOURCE FOR:
Camshafts
Pushrods
Valve springs
Custom Turbos
Exhaust Manifolds
Carrillo Connecting rods
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09-17-2013, 12:29 PM
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#79
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Name: outlaw99
Title: Too Much Time
Status: Not Here
Join Date: May 2008
Location: london
Member`s Gallery
Posts: 4,209
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180-250* thats with a water to air system?
__________________
04 QCLB 'OLD WHITEY' 839/1670 100hp tips... 
TOOPS PERFORMANCE
IN HOUSE DYNO TUNING
EFI LIVE/UDC TUNING CUMMINS
03-04.5 efi conversions
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09-17-2013, 12:39 PM
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#80
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Name: dansdieselp
Title: Diesel Tuner
Status: Not Here
Join Date: Aug 2009
Location: Marengo, IL
Member`s Gallery
Posts: 221
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Quote:
Originally Posted by outlaw99
180-250* thats with a water to air system?
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That is correct.
__________________
Dan's Diesel Performance
815-245-8548
EFILive tuning for 01-10 Duramax and 06-09 Cummins
www.dansdieselperformance.com
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