v10 torque vrs diesel

uncleluap wrote:

427435 wrote:

uncleluap wrote:
argue till the cows come home but a known fact is this.
A 400Hp 500Lb torque gas engine will not propel a 34-38K lb MH up 7% grade at the same speed and ease as a ISL cummns 400HP 1250 lb torque engine
nor will it be as fuel efficient nor will it run as cool nor will it even last 1/10 what a cummins diesel will and thats why u do not see this happening in this day and age.

Sorry, but you are wrong as far as how fast. Speed will be determined by hp. If the gas engine has enough transmission speeds to keep the engine at or near it's peak hp, it will keep up with a diesel of the same hp. The only caveat to that would be at higher altitudes where the turbo'd diesel would gain an advantage as its hp would not drop off as fast. Of course, many gas car engines (and gas PU engines) are gaining turbos these days, so that caveat could disappear in the future.

I disagree.MH Too heavy and not enough torgue to keep up to the load faction to be equal to the diesel. it would take way too low of a gear ratio to attain what U claim.I suppose in some obscure land of theory(what your in) it may succeed but in my world(reality) there is no way no how and thats why U will not see such a situation as I aluded to in previous posts.SO in theory U may have a valid idea(point) But in REALITY there is no such situation

The determining factor for speed up hill is always weight/hp

see http://www.catrvclub.org/PDF_Docs/Understanding_Perf.pdf

I will agree you need to look at the curve and you need to consider degradation due to altitude for the nonturboed gas engines, but after that the answer is always weight/hp

the physics equations consider mass and they do not change when the mass is larger

HP = torque x RPM (I left out a constant)

both torque and RPM are good and both will increase HP.