TH350 Rebuild Thread part i

[SkysTheLimit]

A full manual valve body is not streetable. That doesn't mean you couldn't drive it on the street, its just you or parts won't last long. Full manual is drag strip material.

What about a full manual valve body without compression braking? Would that not ease the downshifts?

Slightly on a tangent, mostly curious.

 

[fireplug]

I was hoping to order the parts, but I guess I'll wait for the book to arrive before I purchase anything.

 

[Speedo]

Automatics don't engine brake as well as a stick due to the torque convertor. some of the automatics will force an upshift at a certain rpm which can be overridden with a shift kit. Just for fun put you truck in manual first bring it up 4000 rpm, or whatever you feel safe with, and let off the gas. The tranny will cause engine braking, your RPM will stay above idle speed.
Just wondering if you could be thinking of something like the engine braking you see/hear on semi trucks, they use exahust braking.

Semi trucks don't use exhaust braking, they use engine braking and there is a difference. A "Jake Brake" releases some of the compressed air in a cylinder of a diesel engine so that there is not enough temp to fire any fuel that is in the cylinder during the compression stroke. Since there is no ignition there is no power stroke. A semi's engine will use up a considerable amount of energy working as an air compressor.

Here is a link: http://www.straightdope.com/mailbag/mjake.html

Gus

 

[LVJimmy]

Since diesel engines lack a throttle valve on the intake manifold, there is no intake vacuum when the engine is not fueling. The intake vacuum creates the slowing effect felt in gasoline engines when they are going down a hill with the foot off the gas. Many different strategies are used on diesels, the least expensive (and also one of the least powerful) of which is the exhaust brake.Exhaust brakes (otherwise known as exhaust retarders) are manufactured by many different companies. The brakes vary in design, but essentially operate by closing off the exhaust path from the engine, causing the exhaust gases to be compressed in the exhaust manifold, and in the cylinder. Since the exhaust is being compressed, and there is no fuel being applied, the engine works backwards, slowing down the vehicle. The amount of negative torque generated is usually directly proportional to the back pressure of the engine. More advanced exhaust brakes have exhaust pressure modulation (EPM) that controls the back pressure which in turn improves the braking performance across a range of engine speeds.
Exhaust brakes should not be confused with engine brakes, which hold the exhaust valves open, although the basic principle of operation is similar.