Originally Posted by bonnie94sse
EDIT: Why do the TDi'* run so slow? I know they run on Diesel but is that the ONLY reason they run like that?
Id like to answer your question
I currently own a new 6.6 duramax also my lincon welder is a diesel and in the past my dad has owned a few 6.5s, one was in a 95suburban and the other was in a 99 tahoe 2door(I wish he sill had this truck).
class is in session
gasoline- gallon= 125,000 BTU (20%(best) energy is used in a litre)
diesel - gallon= 147,000 BTU (33% (average) energy is used in a litre)
gasoline compression- 8.5:1 - 12.5:1
diesel compression -14.5:1 - 25.5:1
A diesel engine uses compression to spark, therefore it has to rev a lot slower.
also they have a longer throw to create more compression.
Its all about torque...
and from that video, isuzu made a really sweet engine (and I like mine)
Now I got you thinking that the TDI should be the best!! but now the down sides
They only run when there warm, so the glow plugs have to be on all night almost (in the winter)
There noisy (exept isuzu'* duramax, its quiet)
The exhaust is black (so it looks like its worse for the enviroment, but its really better)
They rev lower... I think the cummins 6 does 2800ish and my durmax is 3600ish
There expensive to fix, my buddy spent 10,000 on his injector pump for his 02 cummins (the warrenty payed but still, each injector is 400buxx)
constent oil changes... sure the diesel lubricates it but it still needs cleaner oil.
they are heavy (for the I4 in the tdi maybe 700lbs... very out there, but might be true)
they run hotter
If you let a diesel engine run out of diesel and its a a whole new injection system($$,$$$)
-They love to idle, and stay at the same rpm(cruis)...they can do it all day, worse thing for a diesel is starts/stops/ons/offs justs rapes the injection system
-turbo'* (from a simple turbo they can gain 25% power) and twin turbos 50%.
-enviroment (even more for bio-diesel)
... I know more, but I think you got the picture...