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FC (Forward Control Unique Issues) If you have a unique issue with your FC model coach and it can't be answered in one of the other forums here, then this is where you can list it.......List your FC Parts here too.

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Old 01-09-2018
Rick's Avatar
Rick Rick is offline
Senior Member
Join Date: May 2009
Location: Bellefonte
Posts: 13,218

Originally Posted by JP Green View Post
Greetings, Could you talk some more about this 4 speed Jake? I was under the impression jakes couldn't be used in V8 configs. Is it possible this is a retarder and not a compression brake? Thanks
Your impression would be wrong. Many 8V and 6V Detroit engines are equipped with Jacobs engine brakes. The V8 cats did not have a true jake but did have a Thelma drive line retarder marketed as a Jake.
Rick Shawver
1SG Ret
2000 LX
Vise Grips
Bellefonte, AR
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Old 05-09-2018
kg4rrx's Avatar
kg4rrx kg4rrx is offline
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Join Date: Feb 2018
Location: Fayetteville
Posts: 606

Thinking back to my drive home last week. We hit the biggest hills going from Johnson City Tn to Asheville, about 80F outside. Grades were 7-8% up and down. Engine water never went above 195-200, Engine oil 220-240. Transmission temp only rose downhill with the retarder on. I generally would hit the fan override as soon as I saw what I had coming.

My only concern was EGT- which would run up to 1100 in not too much time at all. It few times I was down to 15-20 mph to keep the pyro down. It also seemed that the bus was happier (and kept the pyrometer temperature down) when I locked 2nd out of the ZF to keep the RPMs around 2200-2300 instead of lugging in D with the RPMs 1800-2000. Driving up in D was making the transmission hunt more, too. I wasn't a fan of shifting up and down on the same grade.

Am I doing anything wrong or anything I should be checking into? It just seems like a bad idea to sustain 1000+ degrees EGT while everything else seems fine.
Chris Henry
Fayetteville, GA
kg4rrx@gmail.com 404-547-1951
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