cummins 5.9Ldiesel swap into my 89 3/4 ton suburban

[84_Chevy_K10]

Cats are so well respected and liked, it'd be awesome to see one in a pickup.

Unfortunately they're ungodly expensive so I doubt you'll ever see the factory do it.

 

[mcinfantry]

my 4bt is governed at 2500rpm. im getting by just fine at that rpm.....
a frito lay/bread van cummins 4bt should be almost bolt in. cummins made the motors in th400 and sm465 configurations. it was designed and built to replace the 350's that were put in the late 70/early 80 p-30 chassis.
105hp/286tq if its turbo only. aftercooled is 120/300+.
you can get 250/500 reliably.

at 105/286 i get 24mpg at 70mph. im running 4.56 gears, nv4500, and 38.7" tires in a 6500lb vehicle that is literally flat across the front. i geared the fuel efficiency aroubd 55-60mph, NOT 70. it should get 30mpg if i kept it at 55-60. NOTE: 145 total miles =60 miles highway (65 to 70mph)/85 miles stop and go town driving
24.16 mpg!!!!!!!!!!!!!!!!!!!!!!

 

[tarussell]

In answer to your question about the ISB's in the Dodge's they will turn up to 3200 or 3400 RPM's . Although in stock form they start de-fueling at 2700 RPM's .
Tom

 

[BlueBlazer]

[ QUOTE ]
I wonder if it would stay together at 3,000RPM's

[/ QUOTE ]

Uh, yea they will./forums/images/graemlins/thumb.gif

This is a marine application with a 2800 rpm rated speed, so the overrun probably goes at least over 3000 rpm.



3126 Marine

 

[rjfguitar]

Sweet, it would be nice to have one governed at 3,000RPM's in a pickup. Maybe one day if I ever have that kind of money and time. /forums/images/graemlins/whistling.gif
Hey blueblazer62,
I know you work for CAT so you would probably be the best to ask....How many RPM's can the C12's and older 3406's take safely? How about the 60 series detroit and M11/N14 motors? Curious because all of our motors in the trucks are governed at 2100RPM's.

 

[BlueBlazer]

Dont know about the Detroits or Cummins, but the Cat super truck with a C12 I think makes peak hp around 2500 or so, but of course that engine is not very stock. Marine and industrial 3406s can run safely at 2300. The thing is, there is no reason to make them rev higher because their usable power is all in the 1200-1800 rpm range. The engine also lasts a lot longer the less time it spends at higher rpm's. A lot of work goes into optimizing these engines for the road so obviously if higher rpm's would help, then our engines would be built to run faster, but they dont need to and are in fact optimized to run in the 1200-1800 rpm range.

 

[Stomper]

[ QUOTE ]
used to email back and forth with one of the design engineers for the Duramax back in 1999 before the engine's specs were even released or anyone even knew what the Duramax was.


[/ QUOTE ]

How did yo know one of the engineers? Wouldn't you have been 14 in 1999?

 

[rjfguitar]

[ QUOTE ]
Dont know about the Detroits or Cummins, but the Cat super truck with a C12 I think makes peak hp around 2500 or so, but of course that engine is not very stock. Marine and industrial 3406s can run safely at 2300. The thing is, there is no reason to make them rev higher because their usable power is all in the 1200-1800 rpm range. The engine also lasts a lot longer the less time it spends at higher rpm's. A lot of work goes into optimizing these engines for the road so obviously if higher rpm's would help, then our engines would be built to run faster, but they dont need to and are in fact optimized to run in the 1200-1800 rpm range.

[/ QUOTE ]
Yeah, I know, I was just curious what they would turn.