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Big cam Cummins 1800 vs 2100 rpm differences

Posted By Mclean Sunday, September 23, 2018 6:17 AM
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Mclean
 Posted Sunday, September 23, 2018 6:17 AM
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All, I've got a dump truck with an 1800 rpm big cam 4
And a grapple truck with a 2100 rpm big cam 4

The 2100 truck has 5.29 rears.
The 1800 truck has 4.44 rears.

The 2100rpm motor seems to enjoy the hwy more.. can the 1800 setting be easily changed (pump shop)
? Or is the cam different between the 2?

Much worse mpgs, or loss of engine life with 2100rpm engines?

Thanks
Geoff Weeks
 Posted Sunday, September 23, 2018 8:15 AM
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A pump shop can change the max RPM, there are no internal differences that I'm aware of.
I had a CPL 838 set at 1800, made a whole new truck when I changed to CPL840 (350 hp) and 2100 gov speed. Mileage increased with the change!
1800 was a fleet setting to try and cut down on the "cowboys" rawhiding them.
Sunday, September 23, 2018 8:18 AM by Geoff Weeks
Newto
 Posted Sunday, September 23, 2018 12:35 PM
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What Geoff said!

A fuel shop can recalibrate your pump to 2100RPM.

There are no internal engine differences, just the pump calibration.

The majority of highway engines were set at 2100rpm....the lower rev units were supposed to give better fuel mileage.....not many did!!!

Newto

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