427435 wrote:
Medico wrote:
The other problem, which has been mentioned briefly a couple of times, is that a gas motor will have to rev much higher to get up that same hill as a DP. That is one reason why oil change intervals are more frequent with gas engines. They have to work harder to accomplish the same thing. Generally this is not a problem if you do good maintenance and the gas engine has lower miles. That same gas engine, as the miles begin to accumulate might need major work much sooner than a diesel engine.
In addition, as has been mentioned, most gas chassis start out much shorter and need to be extended to accommodate larger coaches. The chassis/gas combo was designed and rated for the shorter chassis. Put a longer chassis on it without changing something else (gear ratio for example) and you will shorten the lifespan of the chassis, including the engine.
You are not very familiar with engines or engine design. A diesel engine putting out 350 hp at 1800 rpm is under a great deal of stress. The cylinder pressures in those cylinders, the load on the piston, the load on the connecting rods, and the loads on the crankshaft and bearings are all very high----much higher than the loads on the same components in the gas engine making 350 hp at 4500 rpm. If you don't believe that, look at the size of a connection rod from each engine.
But isn't this the very reason a diesel will last longer due to the heavy duty structure of the block, heads, pistons....etc. Becasue it has to withstand so much force on the parts it has to be built a lot tougher...and the area of a diesel piston is much more than a gasser.
And the stress on the gas motor will cause it to wear out much faster than a diesel...higher RPM, for example. Spinning it faster is certainly causing more friction. The V10s are probably in a different class as there are more parts to take the stress; 10 pistons vs 8, bigger block. I am just adding what I think....not facts! That is what forums are for, IMO...to l e a r n.......
