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5.9 Magnum MPG

Posted By: Polaraco

5.9 Magnum MPG - 11/16/09 05:59 AM

I been bad. . .Been a member for over a year, come here and get distracted. So I start being a gas bag rambling. But I think you'll get what I need. Unlike some of you, I'm not looking to cut .000001 off my 1/4.

I need some help picking a Cam. I don't want to pester the EBooger any more than I have lately. He's itching to race me for pinks. Think I'll bring my 600 HP diesel and my trailer so I can bring his DAK home. ANYWAY Bear with me

I just aquired a 93 VIRGIN 5.9 Magnum, complete. Since it had a little water in it, with no harm to the cylinders, I figured I woud do the same thing I did to my 5.2.

I have a 72 Dodge Polara, yes a C Body, one of 8 I own + the 08 R/T and the 08 Dizziezle 2500. 3 years ago I installed a 5.2 with the factory pooter, harness and the 518 trans. I get 27 MPG with this car at 70 with the A/C running. I want to try to get the best I can from this motor as well. But I don't know how to select a duration, lift ect. for this application. The cam in the 5.2 was rated for max torque between 1200 and 5200 RPM. 286/292 lift. (See below) I'm not disappointed, but it was just a stab in the dark when I bought it. Lucky guess. The new engine has a brand new stock cam in it. I need to put lifters in it. The water damage was pretty much in the upper vallys and some water in 2,4, and 6. Thank goodness for high alloy blocks. Do you think the stock Cam would be good enough? I also have a Hughes Air Gap intake on the 5.2

So! I want to get better MPG out of a 5.9 without sacrificing the output.

Raising HP helps lower the HP:weight ratio and makes it more economical. Erodynamics are good, much better than a D150! It works in the diesel world.

This is my baby, a daily driver. These pics are from 3 years ago.
http://www.moparfins.com/Polaraco/Polaraco_The_Car.htm

It's the only one like and some have tried to copy it without success.

Any worth while input is appreciated and thanks.

Steve

BTW. . No comments form the peanut gallery

Posted By: patrick

Re: 5.9 Magnum MPG - 11/16/09 11:50 AM

go to www.bulletcams.com. check out their hydraulic roller profiles. I run their HR259/316 lobe for both the intake and exhaust on my 318 with mag heads. runs real strong. I think it would be a great cam for making power and economy (it's got a lot more life and .050 duration than the stock cam, but less advertised/overlap).

I'd get the stock cam reground on the stock LSA with these lobes (should be either 112 or 114 LSA). talk to Tim at Bullet, it should be able to be done. I'd install it 6-8 degrees advanced (ICL ~106).



I'd also in
Posted By: Polaraco

Re: 5.9 Magnum MPG - 11/16/09 04:48 PM

Thanks Pat. . . I'm trying to learn how to do this. Now if I could retain it for more than 5 minutes. . . .

I seem to have a mental block on sizing Cam Shafts
Posted By: 360view

Re: 5.9 Magnum MPG - 11/17/09 01:42 PM

Quote:


So! I want to get better MPG out of a 5.9 without sacrificing the output.
This is my baby, a daily driver.
Any worth while input is appreciated and thanks.
Steve




If you are going to swap in a camshaft that closes the intake valve several degrees later past bottom dead center,
and you still want to get the same or better MPG in daily driving,
you will need to raise the static compression ratio to keep the important 'dynamic compression ratio' from dropping due to the camshaft change.

Discuss this subject of the dynamic compression ratio versus the camshaft spec with the custom camshaft grinder.

A MPG gain of up to 10% in daily driving can be had if you are willing to shift your engine's torque curve into the higher rpm range .. but in lower rpms there may be a bit more sluggish feeling.

more info:

http://en.wikipedia.org/wiki/Atkinson_cycle

middle of this web page

http://www.hybrid-vehicle.org/hybrid-vehicle-ice.html

Good luck
Posted By: HotRodDave

Re: 5.9 Magnum MPG - 11/17/09 03:22 PM

Quote:

Quote:


So! I want to get better MPG out of a 5.9 without sacrificing the output.
This is my baby, a daily driver.
Any worth while input is appreciated and thanks.
Steve




If you are going to swap in a camshaft that closes the intake valve several degrees later past bottom dead center,
and you still want to get the same or better MPG in daily driving,
you will need to raise the static compression ratio to keep the important 'dynamic compression ratio' from dropping due to the camshaft change.

Discuss this subject of the dynamic compression ratio versus the camshaft spec with the custom camshaft grinder.

A MPG gain of up to 10% in daily driving can be had if you are willing to shift your engine's torque curve into the higher rpm range .. but in lower rpms there may be a bit more sluggish feeling.

more info:

http://en.wikipedia.org/wiki/Atkinson_cycle

middle of this web page

http://www.hybrid-vehicle.org/hybrid-vehicle-ice.html

Good luck



Would you explain that please?

My motor picked up real good MPG when I shifted the RPM curve down with a smaller than stock cam and higher compression and a smaller carb (as long as I stayed out of the secondaries). I am not just wondering about other theories
Posted By: patrick

Re: 5.9 Magnum MPG - 11/17/09 04:13 PM

Quote:

Quote:


So! I want to get better MPG out of a 5.9 without sacrificing the output.
This is my baby, a daily driver.
Any worth while input is appreciated and thanks.
Steve




If you are going to swap in a camshaft that closes the intake valve several degrees later past bottom dead center,
and you still want to get the same or better MPG in daily driving,
you will need to raise the static compression ratio to keep the important 'dynamic compression ratio' from dropping due to the camshaft change.

Discuss this subject of the dynamic compression ratio versus the camshaft spec with the custom camshaft grinder.

A MPG gain of up to 10% in daily driving can be had if you are willing to shift your engine's torque curve into the higher rpm range .. but in lower rpms there may be a bit more sluggish feeling.

more info:

http://en.wikipedia.org/wiki/Atkinson_cycle

middle of this web page

http://www.hybrid-vehicle.org/hybrid-vehicle-ice.html

Good luck



well, the cam lobe I suggested actually has the same or slightly LESS adv duration than most stock 360 mag cams, but about 16 degrees more .050 duration. so it shouldn't affect DCR at all, but provide a nice additional kick in the pants.
Posted By: Fury Fan

Re: 5.9 Magnum MPG - 11/17/09 04:32 PM

Polaraco - glad to run into you here. You and I emailed a bit a few years ago via the Drydock.

You'll get a lot of good info from the guys who already responded. I'll mark this thread as a favorite for sure.

And I can't resist this:
A well-tuned carb could get you just as much MPG, and you should put a stroker kit in it for more power. No Moparts thread is complete without those 2 comments!
Posted By: QuickDodge

Re: 5.9 Magnum MPG - 11/17/09 06:29 PM

Polarico, what rear axle gear is in your car to get that kind of mileage? What else did you do to improve gas mileage?
Posted By: Polaraco

Re: 5.9 Magnum MPG - 11/17/09 08:55 PM

Quote:

Polarico, what rear axle gear is in your car to get that kind of mileage? What else did you do to improve gas mileage?



Fury Fan You Cad. . .You're a member of MoparFins too. Time to check in.

I have a Hughes air Gap MPI intake and scrapped the beer barrel. It worked extremely well on my 5.2 so it's getting moved over. I am running a cold air intake with the air filter behind the header. Made a hugh difference. Electric fans (Because I couldn't make the clutch work in there) They save about 15 HP alone. I had a set of the high flow logs, but put a set of Gibson headers in. Not much of a difference. The rear is a 3.55's and 235-75-15 tires. It matches the D150 I had as a donor

Remember, this is in a 72 Polara. The erodynamics are much better than the pick ups. Apparently I was the first to stuff a magnum into an old C Body with the 518 and the complete factory harness.
Posted By: Polaraco

Re: 5.9 Magnum MPG - 09/15/10 03:18 AM

Well I thought I would bring you up to date.



After 2000 miles, The mileage is starting to jump. I went from 12 to 18 and it looks like I am in the 20's now. I haven't been able to run it on a long tank to tank run yet.

I used these pistons and raised the Static ratio to around 9.6:1 from 9.1:1


The heads were ported for street


I used this Cam



The fuel injection was upgraded to the 94 Specs with the larger 5.9 injectors and the Mopar Perf pooter. But I still don't think I am getting the full potential from the engine. As time goes on, it is getting better and seems to be breaking in nicely. The magnetic plug has hardly anything on it after the 1st change.

Posted By: Rollin Hand

Re: 5.9 Magnum MPG - 09/15/10 04:27 AM

I wonder what the mileage at the Demo at the Jorsey Shore would be.
Posted By: 440newport

Re: 5.9 Magnum MPG - 09/15/10 05:22 AM

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