Competition Cam with a lope

[SHobbs]

Hope I spelled lope right, lol. Anyway I had a 350 chevy years ago that I bored . 030 over, put in a 400 crank with a full cam and loved the way it sounded with the lope in it. I was at a truck pull one time where the semis were pulling and I heard a truck idling and could hear the lope in the engine.



Is it possible to have a cam in our CTD with a lope in it? Gassers sound great with it, but dang a diesel sounds down right mean with it. Inquiring minds want to know, lol.

 

[JTrantham]

J. R. Adkins makes a number of cams. I have one of his that makes great power and sounds mean. A cam like this requires a bunch of valve clearance. High timing, large injectors, and lower compression contribute to the lope as well. Also, little chargers and small exhaust can conceal the lope sound.



Jonathan

 

[crawler]

Now Johnathan, just how would you know anything about small chargers and exhaust concealing cam lope. :-laf



Johnathan is right though.



Cam

Compression

Timing

Injection Pump

Lines

Injectors



All of these contribute to the lope.



To use a cam that will cause a noticeable lope you will need to have the pistons nothed, flycut, etc... for the valves new lift measurements.



Cams are available from a number of vendors. Only some of them will cause a very audible lope though.



Later,

Wes

 

[KLockliear]

In a gas motor, the cam controls valve actuation which lets in the air and fuel charge. By changing when the air/fuel gets in, out and the overlap between the two, at low RPM (idle) the cam can cause a surge, or lope.



I have not heard a cam only, cause a lope in a Cummins. Because the cam in the Cummins is only affecting air, and not the fuel delivered, I don't believe it can cause a lope by itself. If I'm wrong, someone please chime in with what cam in an otherwise stock truck will cause a lope - that would be interesting.



We have seen large injectors cause a lope. Also, larger fuel lines on a 24v can cause it.

 

[COMP461]

You will not hear a diesel cam cause a lope in the motor, the reason Gas motors lope is overlap and this at low RPM's cause’s reversion. The real facts about diesel cams is the bigger the better if it will clear , and , " will have short enough seat timing to make compression , I have roller many of the new diesel cams thru and most have big numbers at . 050 and even bigger numbers at . 005 , but the real numbers that count are at . 100 , and . 200 this is the meaty and aggressive cams that will move a lot of air and not crack the valve open and keep it open to long and bleed off the cylinder pressure needed to make the basics of a diesel motor work. Now to run an aggressive cam like this you will need to pay attention to other things like valve springs to keep the lifter in contact with the cam.

 

[JoshPeters]

The lope you were hearing at the pull was probably a Detroit 2 Stroke. They tend to do that if the Governor isn't set just right. Heck if they are turned up they are almost impossible to get to idle without that RumpRumpRumpRump.



If you want to make your Cummins do it..... (I don't recommend this) Tighten one of the Governor springs one click to far.



Josh

 

[SHobbs]

Josh,



If I remember correctly I think it was a Detroit. It had two turbos and two superchargers. Not sure how big the engine was V8 maybe could have been an I6.

Like I said it was one heck of a sound.

 

[bgilbert]

Now they want it to sound like a gasser jeez:-laf. . Silly gasser ideaLs. .

 

[Jim Fulmer]

If you get a truck to lope that bad then that means it's going to drive like crap the other 99% of the time when your not on it! It is actually very easy to make allot of power and still have it pur like a kitten down the road. Mine idles fairly smooth and cruises nice the my big injectors and is perfect with 370... uphill, down hill, cruise control on or off.



Cam..... fairly big street..... milled pistons to clear the valves

Compression... . 15. 5

Timing..... nothing radical..... ever

Pump... ... not that big

Lines... ... stock

Injectors... ... fair size



HP!



700... . ish..... 370's

800... . ish..... EDM's

850... . ish..... Big DV's and holders

870+. . ish and counting with Water



Fair power for a daily driver!



Jim

 

[JTrantham]

A big cam may not match the "lope" sound of a gas motor, but it will alter the sound of the motor. It has more of a "chug, chug, chug" sound. Like I said, other motor modifications must be made to fully realize the affect a big cam has on sound.





Wes, could you be suggesting that I have personal experience in how a small charger can conceal greatly altered engine sound!!! I would never run a stock charger on a race motor. If I did do something crazy like that, I was thinking my drive pressure may go a hair over 1:1 at 4,500 RPM :-laf



Jonathan

 

[DPS]

There is no cam out there that works in a diesel that will make it lope. period end of discussion. All the lope or other noises that come from a diesel are the result of the fuel system. Un-balanced delivery valves, quick delivery pumps, massive amounts of timing create the "lope" Fuel systems are where its at, what do you think makes the new common rail quiet? altered injection events and a different injection system. A VP 44 truck with big injection lines and a couple other mods will lope so hard the truck will rock 2 inches side to side with a stock cam.



Josh www.dieselperformancesolutions.com

 

[SHobbs]

Not sure how this one was set up, but he was pulling with it and made a full pull to boot. Like I said that thing sounded mean while it idled. The quote about wanting to sound like a gasser, no way. Like the sound of a diesel and really enjoyed hearing that truck. Just thought I would ask.

 

[TGibbs]

Isnt there a box of some sort that puts a lope in the motor like that. I thought a buddy of mine had one on his ford but at that time he had the power stroke in it, now hes got a 12V



Just a shot in the dark

 

[DPS]

Yes there is an electrical mod that will make a PS lope a little or a lot.



Josh www.dieselperformancesolutions.com

 

[TGibbs]

Not for Dodge?

But they dont make them for a dodge huh? That bites I would love to have one put on my truck

 

[JoshPeters]

Josh,



If I remember correctly I think it was a Detroit. It had two turbos and two superchargers. Not sure how big the engine was V8 maybe could have been an I6.

Like I said it was one heck of a sound.

It was probably a "16v92" which is really 2 V8's bolted together. So they use 2 turbos and 2 superchargers.



For those who don't know Detroits...



8v92... . V8 with 92cubic inches PER cylinder.



Like I said above... they were known to bolt the crankshafts together to make a "16v92" (72, 92, etc... . they had a few sizes)



Josh



Does anyone have the link to the "Bathus Burnout" (spelled 10 different ways) It's the Semi doing doughnuts and walking the truck sideways for 1/8th mile. That truck, if you listen in the beginning, is what I think your talking about.

 

[jtisdale]

If you want a lope, you want a set of these... http://www.haisleymachine.com/PERFORMANCE PRODUCTS.htm

scroll down until you see "fuel injection lines-set of 6"

But, if you go too big, you will have drivability issues, ie stalling, etc.

 

[HoleshotHolset]

It was probably a "16v92" which is really 2 V8's bolted together.

If I'm not mistaken - DDEC did (does?) make 16V-xx blocks...

The Bandag Bullet (Australian-built Class-8 tire smoke creator, tire destroyer... ) is two 8V-92's bolted together (4 turbos/2 superchargers).



Gotta love the 2-stroke Detroit noise... Would I say I'd rather hear a big cubic inch Detroit over a KTA Cummins... ? Never.



Heres a sweet lookin' Detroit 2-stroke... MMMMMmmmmm!



Matt