Diesel V8 Hummer H2T?
By: Mike Levine / KGP Photography Posted:
12-14-07 03:00 PT
© 2007 PickupTruck.com and KGP Photography
#1: 12-18-07 15:05 PT
this partially blocked view of an H2T mock-up from a scan of
H3 (Launch Book) that's posted on the H2 Forums at
A spy shot
of what the boys at Winding
Road say is the future Hummer H2T looks like it also might be
the first half-ton truck from General Motors we've seen running with
GM's new light duty 4.5-liter Duramax diesel V8 under the hood.
I think the 'tell' is.
on the truck (seen in the top picture and middle photo, left)
appears to have a very large aperture - a sign that it's using a serial
double barrel exhaust, with a gap between the two pieces, to quickly
cool its exhaust.
a diesel H2T needs this?
diesel' vehicles require a device called a diesel particulate filter
(DPF) to trap engine soot, so the soot doesn't pollute the environment
in the form of black exhaust clouds that have long been associated
with diesel engines. The
DPF is placed between the engine and the tailpipe.
while the DPF gets gummed up with accumulated soot and has
to be cleaned out. The only way to do this is to inject
metered amounts of diesel fuel into the DPF to burn the soot up, like
a self-cleaning oven, in a process called 'regeneration'.
temperatures can hit 1,100-degrees during regeneration and, as you
can probably imagine, the exhaust gets close to these temperatures
To not burn
nearby vehicles (and people) the gap in the tailpipe creates a 'Venturi'
effect that pulls fresh air through the split to rapidly cool the super
hot exiting gases right before they pass the exhaust tip.
In the middle
picture, you can see a slightly enhanced close-up of the H2T tailpipe
for comparison against the exhaust portal of a 2008 Chevrolet Silverado
Heavy Duty pickup with a 6.6-liter Duramax V8.
6.6-liter and 4.5-liter (when it debuts) have to comply with the same
tough federal regulations that limit the amount of soot that can be
emitted by a 'clean diesel'.
look (bottom) at a Venturi tailpipe, so you can see how the two pieces
fit together straight on.
close-up picture of the H2T tailpipe at 100% resolution:
also find more pics of the H2T over at Jalopnik.