Down hill pull question

Me Again wrote:

Turtle n Peeps wrote:

To make a long story short; compression. It takes a lot of energy to compress a 16 to 22 to 1 piston. And if your foot is off of the go pedal there is no bang in the cylinder so your trying to compress a lot of air and the down hill grade energy is doing that.

When my dad bought his 93 diesel he was going to take a trip to Alaska and was freaked about doing it because of the same old tired stories he heard about diesels. When he got back he said that those people don't know what they are talking about. He said it held back better than my old truck. (Which was a gas small block with 3 speed auto). Remember, this is with an old 4 speed diesel with no TH or anything like that.

In short, you have nothing to worry about. Stick it in TH and drive it how fast or slow you want to go.

And that energy to compress the cylinder is almost all returned when it un-compresses on the down stroke. Until you have owned a Dodge/Cummins people do not seem to get it. The V8's seem to hold back better.

Chris

Sorry, but nothing un-compresses on the down stroke. The valves are closed on the power stroke.

Take a syringe and draw in a bunch of air and then put your finger over the hole and compress the air and then leave go of the plunger. It will spring back about 50% and then it will take a lot of energy to draw it out to the original position.

So you tell me; why does the V8's seem to hold back better? Why is the Cummins special, or not so special in this case? I have owned over a half a dozen diesels V8's and in lines and all have held back just fine.

Like I said, my 6.5 with 4L80E holds back better than my gas SBC with T400. My Dmax with VV turbo and TH is no contest in hold back power. It will kill any gas engine I have ever owned on hold back power.