Medium duty truck questions

[SuperCab]

Lord, I've been full of questions lately Hope you guys dont mind


So me and one other guy have been looking at getting a mid sized dump rig, single axle, probably 10 - 16' bed.

Older Chevy and Ford gassers are what's in the budget.

We were looking at a 70s GMC 6500 with a blown 350 in it.

And we got to talking... 350 cores are cheap, rebuild kits are cheap...

But when we got to thinking about specs, we came up with some questions.


Why are truck engines traditionally low compression. It'd be easy to bump the compression to 9+:1 during the rebuild, but I read somewhere that that's bad in a truck "because it won't lug"

I have no idea what that means.

Also, do you think a RV cam would help or hurt in a 3-5 ton truck application.

The aforementioned prospect has a 4 speed trans (no OD) and a 2-spd rear axle.

Doin the math, it seems you'll be running 3000 - 3600 RPM to make highway speed with it (55 - 65 MPH)

is that too high for an rv cam?


Thanks!

 

[1985 Ford F-150]

An RV cam would be good for it I have a 268 in my 302 and it quits pullin around 4500. As to the compression thing I think they did it so ya dont have to run premium in it all the time. 9:1 your fine for bein able to run low grade (at least here) when ya get up to 10.5:1 then youll need premium. Ive never heard about high compression not bein able to lug cause my 410 will go down to about 3 or 400 rpm and lug in third gear all day long.

 

[Blue Goose]

Both of these located at Ellsworth AFB, SD 57706

1971 JEEP CORPORATION 5 TON DUMP TRUCK, 6X6, WITH 20000 LB WINCH

57113 MILES, 1889 HOURS, 6 CYLINDER CUMMINS DIESEL ENGINE, 5 SPEED TRANSMISSION WITH HIGH AND LOW RANGE

1969 AM GENERAL 5 TON DUP TRUCK WITH 20000 LB WINCH,

22764 MILES, 892 HOURS

Bidding starts Feb 9, opening bid, $150.00

 

[SuperCab]

No ****? I didn't think of mil surplus stuff...

 

[SuperCab]

Hey Goose or whoever...


Whadya suppose top speed is on one of those army rigs? Would it make an ok construction rig?

Also, my original qestion is still open if anyone has some more input...

 

[Blue Goose]

Those 5 tons (the trucks in that auction) will run 60...

If you're not in too much of a hurry, that .gov auction from time to time has "civilian" dump trucks in it too...

 

[FordF-SuperDuty]

Also check out a website called govdeals.com

 

[FordF-SuperDuty]

1983 F-8000 does not run in Ohio

1989 S-4700 International with 82,170 miles. Color is blue. Manual transmission, firewall rotted, has a high idle, and the clutch assembly is no good, when in service the truck ran but this truck must be towed away. Body condition is fair, dump body and bed and has rust. In New Jersey

1992 INTERNATIONAL 2674 6X4 TANDUM AXEL DUMP WITH 14 CU YD FLORIG BODY.-CUMMINGS 330 H.P D14 DIESEL ENG.-ALLISON AUTOMACTIC TRANSMISSION.-HOURS; 7911.-NEEDS TO BE TOWED.-DOES NOT RUN.-DUMP BODY LENGTH IS 17 FOOT/ 9 INCHES. In PA.

1988 FREIGHTLINER F120 TANDUM AXEL DUMP TRUCK WITH 14 CU YD BODY.-92 SERIES DETROIT DIESEL ENG.-TRANS AUTOMACTIC.-HAS UNDER BODY PLOW.STARTS WITH A BOOST & RUNS in PA