Originally Posted by Cricco
My Monarch has an 8.1L gas engine. It has an engine break.
What style of engine brake, exhaust or compression release? Just wondering, because the way the 4-stroke gas engine works, neither would be much help. Any gas engine effectively has an 'intake brake' in the form of the throttle plate, diesels don't have a throttle plate or any other way to regulate air into the engine. The exhaust brake does the same thing as a throttle plate in a gas engine, it blocks the flow of air thru the engine and causes restriction to rotation of the crankshaft. The compression release brake, commonly referred to as the Jake Brake ever tho' Jacobs Manufacturing makes exhaust brakes and one gets poo-pooed if you call your Jacobs exhaust brake a Jake Brake, actually uses a seperate valve in the cylinder head to release the product of the compression stroke, making a vacuum on the unpowered power stroke, resulting in resistance to rotation in the crank. I'd be AMAZED if you had a compression brake on a gas engine.
If you're talking about the Allison Grade Brake, which downshifts the tranny automatically as you descend, they are wonderful. An engine brake itself will not downshift anything, it just does as I discussed above, causing resistance to rotation in the engine. My Allison has it, and will downshift itself all the way to 2nd as the rig slows if you let it.