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Old 12-12-2016, 09:07 AM   #29
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I had never driven anything diesel before getting the MH! I don't think there's that much to learn besides getting used to the size of the rig! I'm certainly no mechanic, so I couldn't work on the engine, diesel OR gas!
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Old 12-12-2016, 11:51 AM   #30
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In general diesel and gasoline engines are basically the same, both both have crankshafts, pistons, valves, camshafts, etc. The main differences are in the fuel delivery and ignition systems.

Fuel delivery in a diesel is done through a fairly high pressure pump and injectors where the fuel is atomized and sprayed into the cylinders. Ignition occurs from heat generated by combustion so timing is controlled by injection to correspond with somewhere near tdc of the compression stroke. Compression ratios in diesel engines run from roughly 16:1 to 23:1 in order to generate the 400+ degrees F (don't remember exactly) necessarily to ignite diesel fuel. Because of these comparatively high compression ratios a diesel engine must be built more robust and with a longer stroke which generates the higher torque at lower rpm's. It is because of this, and the lubricity of diesel compared with gasoline, that they have comparatively greater longevity.

Gasoline engine fuel delivery and ignition have changed greatly over the years with delivery going from carburation to injection, and ignition from points, coil, distributor, and spark plugs to almost everything being controlled by numerous sensors scattered about the engine providing electronic input to a engine control module and that in turn electronically controlling fuel delivery and ignition. Because ignition is provided by a spark plug and the comparatively higher volatility of gasoline engine compression ratios are generally below 10:1 and they can be built with a shorter stroke and less robust. This allows them to turn at the comparatively higher rpm's necessary to produce their torque and horsepower.

The weight of a 5.9 Cummins is nearly 1000 lbs. It is 360 cu. in. By comparison a 360 cu. in. gasoline engine would weight in the ball park of 300 lbs. That is the difference in construction.

That is the way I understand them. Others may differ and I am always open to corrections and learning.

I hope this is of some value to the OP.

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Old 12-12-2016, 12:07 PM   #31
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Originally Posted by dix39 View Post
I hope this is of some value to the OP.
Yes! Thank you.
Charles and Beverly
"The Eagle" - 1991 American Eagle 38J - Cummins 6CTA8.3 300hp DP, Allison MT643 4spd. Trans., Spartan chassis.
Link to our Eagle Thread
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Old 12-12-2016, 12:31 PM   #32
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Originally Posted by cwk View Post
Yes! Thank you.
I don't like to get into posts like this but I'm glad to help. With that being said look for yourself at the interiors, lean against the walls or push on them, open the cabinets in the gasser and compare to a DP coach. Really digest the over all construction differences. Drive both, this is a big step so take the time and really take it all in. Most of the mid to upper range DP's have real wood interiors, that was a selling point to us as the gasser was crumbling when we got rid of it.
We have had both, I modified my gasser to handle better, we went to a DP due to a good deal and our gasser was falling apart, the roads in the US beat that poor coach and we were just at the right place at the right time.
I spent the majority of my career as a emergency vehicle/truck tech and worked at a Ford truck dealer, so I am familiar with the ford chassis, its a good product.
******* Please keep this in mind while shopping ******
The RV industry started to crumble in 2007,this is when the manufactures were trying to maintain their profit margins and they were using cheaper products, on some makes and models to maintain those margins. Cutting corners was what it was all about.
In the engine side this is when the emissions on the Diesel stepped up by Federal law and became a headache for most consumers (and engine manufactures). If you are looking at used keep that in mind, after 2012 most of the emissions stuff had the majority of the bugs worked out but became even more complex on the diesel side around 2010-2011. Before all of that (2006 and older, depends on when the engine was made)they were fairly simple.
You can find some of those good old coaches used that were well taken care and their price points are decent.
Good luck with your searching.
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Old 12-12-2016, 12:45 PM   #33
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You're welcome, and there is a lot more to it. I think if there is a desire to learn all you need are books and the internet. There are also folks on this site that know a lot more about the subject than I do.

I should have added that since, I believe the later 90s, diesel engines also began using electronics to control fuel delivery and emissions.

I do remember growing up in WV in the 50's that most, or all, of the larger trucks were gasoline powered. Also, while in the Navy during 1958-1962 there weren't many diesels. International, Buda, and others made some huge, for the time, gasoline engines that powered trucks and equipment. Widespread diesel use must have come along later. I assumed that your experience with large vehicles occurred later after that had happened. My apologies.

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Old 12-15-2016, 07:17 PM   #34
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What the person was trying to tell the original poster in my opinion or the way I understand it is, that once you drive a diesel, you will NEVER go back to a gasoline motor home. I have had both, and both bought brand new, and the diesel is superior in every category. Ride, heavy duty quality chassis, engine lasts four times longer then gasoline before they need overhaul. Yes they do cost a little more on oil changes, but you also got to consider you do not change the oil as often on a diesel. Most are once a year oil change.
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Old 12-15-2016, 07:32 PM   #35
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Originally Posted by RayChez1 View Post
What the person was trying to tell the original poster in my opinion or the way I understand it is, that once you drive a diesel, you will NEVER go back to a gasoline motor home...
Hmmmm, I went from a DP to a gasser. More than happy with the decision too. Lots more money in the bank is the icing on the cake.
There's always 2 sides to every story.
I don't make it much on here anymore so will not see your reply to my comment. Drop me a direct message and when I come back on I will see it.
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Old 12-15-2016, 07:44 PM   #36
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I had a gas one much newer then the old diesel I have now and would never go back to a gas. I like the diesel much better.
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