84 GMC C2500, V12 powered

[cayoterun]

Originally Posted by Vernski

Yeah that's a better way to aline it than the eagle eye. I was wondering what you had in mind for exhaust? I vote for dual stacks that would be cool looking on that old truck. Anyway I'm enjoying your thread you have a good holidays now!...Vernski

Thanks, Vernski; Same to you for the holidays.

I know I have two big problems to deal with:

#1: Cooling: I'm almost sure I'll need another radiator in the bed, bigger the better. With that, I need to keep as much heat from under the truck, and have room for the coolant plumbing.

#2: What to do with the exhaust to get the heat away from the truck as soon as possible.

Both problems is probably going to take a lot of experimenting. I've had some ideas, but none of them are very good.

I've considered using something like these stacks I built for another motor. It would work, but be a pain to see around them, too noisy, and would probably cause more problems than help. Cops may even frown on them.

I'm working on trying to get all the sheetmetal in their permanent place, then be able to see what space I have to work with.

Thanks for you interest,
Cayoterun

[cayoterun]

Interesting Bumpers:

Both these bumpers came from '46 Chevy Trucks. Wide bumper was on a 1-1/2/ 2 ton grain truck. Narrow one was on a 1 ton. Brackets are different, but width are the same on both.

Could it be the narrow one came from an early '46 that was used on the earlier models and the wide one was one used on later models?
I'll need to use the wide one on the front, because the narrow one isn't as wide as the '84 GMC frame. Maybe I can use the narrow one on the rear, as it sits under the bed overhang.

I've been able to get several small odds and ends done on "Thumper's truck", but not visable enough to prove in pics. 700R4 switchs and elec. wired finally.
Hope to see it run this year.

Cayoterun

[dammitmitchell]

you are telling me that you cant find a big arse radiator tat will fit behind that grill? you got like 5 foot you can work with ?
or am i not seeing something. you could cut and modify that rad support area to fit a short wide rad in there..

dunno.. Id probably need to see it in person to get off my tangent here on this one.

[cayoterun]

Same bumper back with it's truck. I think it looks better, too, so does my wife, (and Thumper). When the better half approves, ------don't touch it!!

Mitch: I think if you could see behind the grill, you could see the limited space. The inner fenders are funneled to force all the air thru the existing radiator support. I wish there was room to mount a big combine radiator up front.

Cayoterun

[1985-GMC]

It looks cool!

Just stick two radiators in there, a horizontal one right in front of that one down at the bottom then plumb it all together.

[locomotive breath]

Looking good CR,
Glad to hear y'all survived the big snow storm a few weeks back.

[cayoterun]

Thanks, Locomotive Breath:
Had quite a little blow for awhile, but the good side is we got some much needed rain before the blowing snow. Still need much more, but glad we got this much.

Cayoterun

[cayoterun]

Wife and I took some travel trailer time off in sunny Calif. Had dry roads all the way until west of Amarillo, Tx. Got slicker than snot for awhile, but didn't last long.

V-12 cooling questions----again?
Why can't I put expanded metal in the bed floor, draw fresh air from under truck, lay radiators face down/w elec. fans, then if needed, an expanded metal shield over the top of them? Only purpose would be to keep them below top bed level and out of sight. Also have plenty of room to work with.

The propane tank mounted against the cab would be the only other thing in the bed.

Would it work?
Cayoterun

[1985-GMC]

I don't see why it wouldn't work...



http://www.streetrodderweb.com/featu.../photo_17.html

[Vernski]

Originally Posted by cayoterun

Wife and I took some travel trailer time off in sunny Calif. Had dry roads all the way until west of Amarillo, Tx. Got slicker than snot for awhile, but didn't last long.

V-12 cooling questions----again?
Why can't I put expanded metal in the bed floor, draw fresh air from under truck, lay radiators face down/w elec. fans, then if needed, an expanded metal shield over the top of them? Only purpose would be to keep them below top bed level and out of sight. Also have plenty of room to work with.

The propane tank mounted against the cab would be the only other thing in the bed.

Would it work?
Cayoterun

Calif is always nice to visit but I can't wait to get home to Idaho once I'm gone. I don't see why putting the radiators in the bed lain down wouldn't work for you. I'm sending a video you might get a kick out of. Enjoy...Vernski

1960 Peterbilt Hotrod Truck called Piss'd Off...

[dammitmitchell]

now you can definately fill the bed and cover with expanded steel. id make sure you had dang good gusseted ribs in there maby 1 1/2 in tubing would work. or hell round oilfield pipe (the small stuff) would weigh a ton.. but would still look cool..
it would keep up with the farmer motif you have going with it haha.

id be worrid about hosing and making sure the water pump has enough volume to move that much fluid.. youd be looking at 6-8 gallons of fluid.
id even consider a remote oil cooler, a tube type.. or hell you can run small side by side trans coolers in the normal rad spot to have a dedicated cold air cooling for them. (inexpensive coolers also! that's a bonus)

[cayoterun]

GMC: That is sharp. The louvered cover sure masks what it covers. I can see how I could run the cover all across the bed, and have hinges for access and protection.

Vernski: Thanks for the video, BUT, what in the world kind of motor izz zatt!!! Whatever, it's one nice build.
This country boy hates that Cali. traffic. We don't start breathing again until we hit the Arizona line coming back.

Mitch: I think/hope we'll be ok on water pump capacity, factory manual says water pump moves 117gpm@2400rpm. The restriction of all the crooked plumbing might create a problem for us. However, by laying it/them flat, I can hit the machinery/constuction salvage yards, maybe find a huge radiator and have only one.

At least with this info, I can go back to the barn with a new approach to the problem.
Any other ideas are welcome anytime. Maybe we can someday hear the old dude run down the road. When that happens, I think it might go on e-bay, then this 'ol geezer put the tools away, sweep the shop and turn out the lights.

Thanks,
Cayoterun

[1985-GMC]

Its a Detroit 12v71 852ci 2 stroke Diesel.

Originally Posted by cayoterun

When that happens, I think it might go on e-bay, then this 'ol geezer put the tools away, sweep the shop and turn out the lights.

Now you wouldn't want to go do something like that...

[cayoterun]

Now, it's my turn to see one I didn't know they built. Would really like to, tho.
Being 2 cycle, no wonder it sounded like it was turning 8,000rpm or more. Learn something new everyday.

I drove an 8v71 Detroit in an IH CO4000 road truck back in the mid 60s. Loved driving it, but hated the sound. Company had 11 of them, but about all of them were oil leakers. Mine would run 6,500 miles, add a gallon, bring it home a gallon low for oil change at 10,000. We shifted @ 1,800 and 2,200rpm/w an 15spd Roadranger.

Thanks,
Cayoterun

[1985-GMC]

I love the sound of them. That leaking oil is a very high tech chassis rust preventive designed into the engine...

[cayoterun]

When I lay those radiators horizontal, will I need to have the fillers necks soldered shut, or will new high pressure caps keep them from losing fluid??

Thanks,
Cayoterun

[1985-GMC]

I imagine you would need to, then put your filler neck & cap at the highest point of the system.

[cayoterun]

Originally Posted by 1985-GMC

Its a Detroit 12v71 852ci 2 stroke Diesel.



Now you wouldn't want to go do something like that...

It wouldn't be because I wanted, but Father time has a way of making the headlights grow dimmer, hinges get rusty, plumbing gets corroded, sound reception gets too much static, gyro goes wacky, spend more time at body mechanic shops, and you watch the road fearing a long black enclosed junk wagon is headed your way. Sooo-

Today's advice from an ol' geezer for the younger. Take better care of the power-plants, do more maintenience, don't over-wind the tachs as often, stay below the speed-limit, less booze, more snooze, and stop, smell the roses every day.

Cayoterun

[1985-GMC]

Haha good advise! I'll do my best.

[locomotive breath]

Originally Posted by cayoterun

When I lay those radiators horizontal, will I need to have the fillers necks soldered shut, or will new high pressure caps keep them from losing fluid??

Thanks,
Cayoterun

The radiator caps should work fine, they will also give you an easy place to purge the air out of the system if needed. I wouldn't lay them completely horizontal though, probably 30 to 45 degrees should keep keep the air pockets to a minimum.
Here is an in-line hose filler that may come in handy. http://www.summitracing.com/parts/MOR-63730/

[cayoterun]

LB: OooKaay, Now I understand why the radiators should have some tilt. Those motors are bad enough to get air-locks in the block without more places for air to collect.
Did your motor have a small line from block side of thermostat housing to surge tank/radiator? I knew that was to help let air from the block around the thermostats.

The coolant hoses to the propane vaporizor will air lock, too, and need loosened and bled sometimes.

Did you guys get any of the slick stuff Amarillo got last weekend? Didn't last long, but I-40 was closed thru town because of all the wrecks. It was like your Dallas storms, thin ice with a couple of inches snow on top. Slick stuff!

Thanks for the in-line filler source,
Cayoterun

[locomotive breath]

No, luckily it stayed above freezing until the moisture quit falling. I guess the weatherman said you didn't have to go very far north to get into though.

[cayoterun]

Boy, Ain't I ambitious. Almost 4 1/2 months since I've talked truck. Backed our travel trailer and pu in the shop this evening in case we get hail. Looked "Thumpers Truck" over and hoped to tackle it again. Still have the 2nd radiator to plumb in. Reread the last posts, so still have a question.

Locomotive Breath or anyone who's used a remote radiator: When I slant the rear radiator, Does it matter which way the vertical slope leans. Top leaning forward, or vise-versa?

Side-note: It was great to meet Panel Deland and swap yarns. Was a great way to spend the afternoon. Thanks, PD.
That's was the last time I've cranked it up and rattled the barn walls. Would like to see it "go" under it's own power before long. We have the "gee", "haw", and "whoa" working in good shape.

Temps here has been running over 100 degrees, so wife may want to spend some time in the mountains, and I won't be hard to convince. That may slow truck progress down again.

Cayoterun

[locomotive breath]

The cool mountain air does sound pretty good right now.

As for the radiator, I wouldn't think it would really matter functionally. However I think leaning forward would look better, and that is how I've always seen them done. Just be careful that you don't have high points where air can get trapped and mess up the flow.

[cayoterun]

Thanks to Pappys, (Rap-em-Pappy V-12 GMC), visit here to pickup another V-12, Thumpers truck can now whoa, go, gee, haw, and back. Tomarrow, she may be street legal with lights, turn signal, like a real truck.
Some braggin' pics taken, will post soon.
Thanks, Pappy for the help.

Cayoterun