Dtank wrote:
JRscooby wrote:
I would still like to see a side by side comparison of engine braking, same displacement gas/diesel exhaust brake. I know the diesel without the add-on has almost nothing, so it would be the difference restricting the air in compare to restricting air out.
Gas = downshift. You will still need to use brakes on and off to maintain speed.
Diesel = You need to take a test drive! "Back when" with my 1985 Ferd diesel - there was no compression braking. A downshift to a lower gear was necessary.
Exhaust brakes were optional on RAM trucks with manual transmissions in 2005. With automatic trans in 2006. After that, like the poster says - standard equipment.
No need to use the (hydraulic) brakes on a downhill - except for a complete stop.
BTW - HDTs (Heavy Duty Trucks) have had "Jake Brakes" for years - including 3 stage. Yes - a Jake Brake (HDT) and an EB (LDT) -some mfg by "Jacobs"- are two different animals that achieve the same excellent results.
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Sometime in the mid '80s I swore I would never by another gas engine if I expected to gross over 50,000 lbs. About the same time I decided I would never put a bed on a truck that did not have a jake. I do have a understanding of the abilities of the engines.
My 1693 Cat had more go and more whoa than any 855 CID Cummins I was around. My 3406E had more go and whoa than the N14s I worked with. All of them, the driver had to downshift to keep jake slowing. But none of the diesels ever would slow a load if the jake was off.
Gas engine, normal operation, you control the amount of air going in. Load pushing engine, close throttle, restrict air into engine, the load slows.
Diesel, a add-on restricts the exhaust, air flowing out of engine. Load push engine turn on exhaust brake, the load slows.
What I have never seen is to like sized engines, same load, same gears, same grade, compare the whoa.
