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8.3 cummins increase hp steve f 9-15-02  
I have a 1989 rockwood 350 xl MH with
the 240 hp 8.3 litre cummins and a 4 spead Allison tranny I have been told that I can increase the hp to 300 by changing the injector pump and injectors. Does any one have any experience with this ? are there better ways to go about it ? will the tranny be ok ? The coach has 59k miles and runs great.
Re: 8.3 cummins increase hp Joe 9-15-02  
If it is an 1989 and never been overhauled, I would be reluctant to get more power from an old engine. Even though the milage is low, the parts are old and time and sitting are sometimes as hard on an engine as constant use.
Your engine has run an average of 4,500 miles a year since new. That is barely enough to change the oil once a year. That is probably about average, but you are going to increase the output of your engine by 25% and that's a lot for any used engine. It will work, you will be happy with the increase, but you will shorten the life of your engine drastically.
Again I will stress the fact that it is not the milage, but the age of your engine that would make me reluctant to make such a drastic change. If your engine were only 3 or 4 years old I would tell you to jump on it.
Re: 8.3 cummins increase hp Ken 12-2-10  
Say you do decrease the life expectancy of the engine by as much as 50%. To me that means you still have hundreds of thousands of miles left, the engine will STILL outlast the RV.

Of corse with this being said I am assuming at the 300 HP mark you have adequate cooling, a intercooler, free flowing exhaust and gauges to make sure everything stay cool and within proper parameters.
Re: 8.3 cummins increase hp Ken Cook 9-20-02  
Steve go to the turbodieselregister and ask your question. The guys there will be able to answere any questions regarding your diesel "Cummins". As for the fellow that answered earlier, that motor is a 400,000 mile on average to rebuild motor and will take at least 10K - 15K of hard pulling to just break it in. I think you get the idea, that engine will outlast 2-3 of your rv's. remember diesels are made much different than a gas engine and are deigned to pull.

I am a diesel specialist 25 years experience.
Re: 8.3 cummins increase hp Sharon 9-25-02  
A mystery to me...... we have a 1999 Dodge one ton Diesl with a banks turbo pack and pack brake--- Mystery is..... everytime we turn on the pack brake and we have not had it on with the 5th wheel in tow. We seem to have a heating problem --- in otherwords the temp gauge goes to like 210 or 220..this is flat or slight up hill climb...Have any of u out there had similar problems ??? I am not sure I know how to get answers to the question so if u can please send your answers to the e-mail direct.....thanks for your Help in advance.... Sharon...
Re: 8.3 cummins increase hp Joe 9-21-02  
I disagree...in the 30 years of running my diesel shop, I have had enough experience to witness what I told you. Your choice.
Re: 8.3 cummins increase hp tony Craig 2-8-03  
HI I OWN A 8.2 DETROIT IN MY fORETRAVEL DO YOU KNOW ANY HISTORY ON THE 8.2 DO THEY HAVE ANY PITFALLS OR PROBLEMS ? iM A AIRCRAFT MECH BUT NO EXP ON THE 8,2
Re: 8.3 cummins increase hp Billy 11-17-10  
I have a runner with low miles 8.3 cummins 210hp I need to get about 250hp to run my bus. Could I put the old injector pump off my old 8.3l cpl 1262 250hp to increase the ponies?
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