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Old 08-09-2010, 03:24 PM   #15
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Sorry. I should have said, certain manufactures require side radiators. That's what I was told. I agree, you cannot get enough power.. It's the cost and could be a big cost.
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Old 08-10-2010, 02:15 AM   #16
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Now I'm getting totally confused. After looking at the charts in the Cummings brochure (http://cumminsengines.com/assets/pdf/4971107.pdf) Seems the max torque for the 400hp ISL develops at about 1300 rpm and declines from there whereas the hp starts at 260HP at 1200rpm and increases to max out at 400HP at 2100 rpm. I assume your "sweet spot" at 1600RPM is the point where they overlap. Giving you the "maximum" amount of "decreasing" torgue at the same time as mximum amount of increasing hp. I THINK
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Old 08-10-2010, 12:33 PM   #17
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our 8.3 isc is 360 hp and 1200 tq
we run right at 29k-31k loaded out, with toad add 8k to that.
towing or empty mileage is 7.9 -8.2 at 66-67 mph
i use 7 for figuring legs of a trip
gobs of tq
and going to nm i do slow like everyone else on the mountains
only complaint so far is off the line get up and go at higher elevations

cummins did a recall to address the off line grunt and egr stuff, it helped some.
it likes to run 70 or faster if i do not use cruise control it will creep up to higher speeds
but i dont like 70 in a big ol bus
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Old 08-12-2010, 11:04 AM   #18
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I find this discussion interesting in that no one has mentioned anything about D.E.F. injection. Availability of urea and the associated on board regenerations, burns, etc. Am I missing something here or is it not a factor?
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Old 08-12-2010, 11:27 AM   #19
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Sounds interesting, probably a new subject start would be good.


Quote:
Originally Posted by MaverickBBD View Post
I find this discussion interesting in that no one has mentioned anything about D.E.F. injection. Availability of urea and the associated on board regenerations, burns, etc. Am I missing something here or is it not a factor?
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Old 08-13-2010, 12:45 AM   #20
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Quote:
Originally Posted by MaverickBBD View Post
I find this discussion interesting in that no one has mentioned anything about D.E.F. injection. Availability of urea and the associated on board regenerations, burns, etc. Am I missing something here or is it not a factor?
totally not a factor!! to the ignorant - ME! unless this was a joke! then I knew it all along.
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Old 08-15-2010, 03:59 PM   #21
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ISl with side radiators. Some coaches have electric fans, is what I recall.

OP - If your total lbs for the engine will be under 39K. Any ISL with 1200 tq, should cover you well. Some ISC's should work well good too.

As mentioned, determine your desired feature - MPG vs Power Reserve. Consider the weights of the rig and toad. Based upon weight and the driving feature that is important to you - choose the ISC-M, as appropriate... Cat's also may fit too.

Be safe, have fun,
Smitty
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Old 08-15-2010, 05:59 PM   #22
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I have a Cummings 370 hp and average a little over 8 mpg (pencil & paper as the trip computer states that I am averaging 8.54 for the life of the coach) I have pulled the Rockies numerous times, towing a Suburban and now a Mini Cooper. I am happy with the engine and the mileage.
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