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Old 09-26-2012, 02:42 PM   #29
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Quote:
Originally Posted by RustyJC View Post
You raise an excellent point. On large industrial engines, there's traditionally a "wrinkle-belly" (a flexible expansion joint) required by the engine manufacturer at the turbocharger exhaust flange to prevent exhaust piping stresses and loads from being transferred to the turbocharger.

Rusty
Exhausst system design and fabrication is one of the biggest issues with large industrial engine installations. I spent most of my career in this field and now I see the same issue in my MH. Some things never change. Keeps me from getting bored.
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Old 09-26-2012, 02:59 PM   #30
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Dennis- @ 6.5mpg I'm betting you also have a substantial leak at the intercooler that, if fixed, would yield additional mileage improvement. 6.5 is pretty low for an ISC.
Good point. During this operation, I went over all the piping connections and did not find anything other than the exhaust pipe on the downstream side of the E Brake that was erroded and in dire need of replacement.
After I finished the work on the exhaust, I took it for a test drive with the bedroom cover off and my buddy with his head in the engine compartment. This was mainly to check on the seal of the E Brake but during the drive, he could not hear any "air loss noises" of any kind.
I have talked to others with the same engine and weight combination and I have not run into anyone that honestly gets much better than 7 MPG.
What would you expect from a typical 8.3 ISC weighing in at 35,000+- Lbs?
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Old 09-26-2012, 05:12 PM   #31
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8mpg if yours is electronic. As a 2003 m.y. coach, I was assuming yours was.
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Old 10-02-2012, 04:27 AM   #32
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turbo clamps

one problem i found that i have not heard anyone talk about was a turbo hose clamps breaking. one broke climbing the hill heading west on i-40 coming out of alberquerque. didn't know if i lost a turbo or intercooler or what (was by myself) got 40 ft hose and a gauge. had no boost found broken clamp. went to freightliner (west of alberquerque top of hill north side of i-40). found out clamps breaking is something truckers live with and carry extras. without boost takes a long time to climb a hill. carry extras now and hoses.
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Old 02-11-2013, 05:51 PM   #33
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The best exhaust manifold out there are the life time warntee ones made by steed speed. The they will lower your exhaust temperature quit a bit. The owner machines the manifolds out of solid steel so there was stronger. Steadspeed. Com
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Old 02-11-2013, 05:55 PM   #34
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The best manifold out there are the life time warntee ones made by stead speed. They are not the cast one the factory makes so they are way stronger.
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Old 02-12-2013, 05:36 PM   #35
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I contacted Steedspeed and they do not make a manifold for the Cummins 8.3 yet.
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