Take me to school on blowers!!

Need some info on blowers. 4-71's, 6-71's I understand they originally came on GMC trucks.

Any info on which trucks?

Are parts readily available for these older blowers?

Any info would be great - I know you guys can come up with some!

 

We already have - do a search using 4-71 or 6-71 blowers and you'll find all you need.


Mutt

 

Easy, GMC engines come in multiples of cylinders which measure 71 cubic inches. Thus a 6-71 is a 6 cylinder engine with each cylinder having a displacement of 71 Cubic inches. I'll leave the math to you as this will let you figure the size engine all of the popular blowers being used on top of automative engines.


Frank

 

The inline GMC 2 stroke diesels have been out of production for a long time, but the blowers show up quite a bit still.

There are some books on the market with lots of info on blowers, to satisfy your curiousity. But in the end usually the best approach is to contact one of the many companies that rebuilds them for hot rod use, and builds drives and intakes. They can set you up with what you need, unless you are doing a seriously HAMB engine and you get to build stuff yourself--then maybe they can just do the blower itself and you can build the drive and manifold adapter.

 

What year GMC's wre they run on?

 

Diesel 6-71 blowers need to be modified to work on a gasoline engine. Rotors should be double pinned , bearing plates need to be changed for use at higher RPM as they don't have enough 'meat' around the bearings. I had one and called Weiand on what it would take to use on a 440. They said by the time I got it all the necessary parts it would have been cheaper to just use one of kits. I ended up selling it to a guy who was rebuilding his diesel.
Detroit Diesels had a few variations of 6-71's , one had an odd shape ,kind or diamond shape and no intakes are available for car use as far as I know. The other style is the same as a BDS or Dyer's although these companies probably are making their own instead of using old cores. Can be found on older Terex , Euclid , and various other off highway equiptment.

Josh

 

The GMC diesels were made from the 1930's until the late 1990's...I believe the last one was produced in '99. The last units were most likely used for generators, irrigation pumps and other industrial uses.

Over the years they saw service in boats, ships, trucks, tanks and dozens of other installations. I've probably driven about 500.00 miles in Jimmy-powered trucks since 1972.

You should be able to piece together a blower set-up with a core blower and drives parts/intake for $1200.00 to $1500.00 depending on your scavenging skills and the ebay gods.

Several outfits rebuild the blower cores...I had mine done by Rick Dean @ deanblower@aol.com.

You need a 4-71 OR 6-71 core..NOT a 6V71 or 8V71...inlines engines not v-series..Do your homework and do a Google search...you'll find all the info you need.

 

Ya know what we used to say about blowers at my school? Let's date 'em!

 

Hi!

Google didn't help me much so I made a HAMB-search and found this thread. I've heard rumours of Detroit Diesel 2-stroke Flathead inline-six with some kind of blower and it is said to be in a railroad crane from late 30'ies called Orton!
1. Is this possible?
2. Which blower it might be?
3. Could it be usable in a car?
4. What the does this blower look alike?

5. Thanks for answering.

Mika

 

Any number of diesel trucks and or diesel powered equipment used GMC diesel motors.

I know a guy in CA that has a shelf full of 671 blowers. I think he gets somewhere between 200 and 400 bucks apiece for 'em. He got 'em refurbashed from GMC when they were cleaning out a bunch of obsolste stuff.

 

Brett search here, lots of threads in the last couple months.


Dont do what my boss did though.................type BLOWER in the Google search bar and hit the "I'm feeling lucky" tab It took two of us 3 hours to clean out the hard drive.

 

Damn how good advice this was (and the other one too...)! So it must be 6-71 but does it look the same as all these on the SBC's or will it be somehow different when it used to be in an inline?

 

So am I to understand that GMC produced a 14 cylinder engine, as in 14-71 blower, or is that purely an aftermarket thing?

 

12 and 14-71 are aftermarket. I have been doing research on google for the past few weeks, there is alot of info. DO a search for Detroit Desiel,

I have heard some folks say you have to do some conversion work but it is mostly the bearing.. depends on how you plan to use (true drag racing with lots of boost or underdriven for street and looks.)

I have seen rebuildign services running about 600 -700, you still need an intact and carb adapter and if you want it shiny, expect some more money for that.

 

I once worked on 12V71 motors, which were a V12, twin blowers, but not the same as the straight six blowers, which hang on the side of the block.

I also used to work on 12V149 series diesels, huge great things twin blowers, four turbos. Pumping out 900 horsepower 24/7. Not sure exactly what 'model' blowers they had on, but it was a lot bigger than the 6/71 type.
They were run end to end, down in the V of the motor, couldn't even see them as they were covered in. Driven from one end, there was a connecting rod in the middle to drive the second on.

Very interesting motors: two stroke, piston ported, four valve heads, central injection, seperate head for each cylinder. Shared liners, pistons, heads etc with every other motor in the 149 series. They could be made to run backward with a change in cam gears!

 

sounds like the diesels we have at our plant as back-ups in case we go down in power in emergency. these are v-16's butted end to end one runs clockwise the other counterclockwise with an altenator in between. two stroke, 14 inch bores, 4-3" valves per head for exhaust and the biggest turbo you ever saw which feeds the bottom of the crankcase with holes in the cylinder for drawing in air. they are really marine diesels for tugs and trains made by electomotve diesel for GM. we have five banks of them , each with two engines per bank. instant woody when you fire them up.

 

Something like this???LOL



T.OUT

 

ok guy's teach me about the 6v53..........are there blower drives for sale?

what gear ratio on this blower on a 276 flathead?

 

I think there was a manifold made for the 8V-71 blower for a BBC but I can't remember who made it.

Just a thought but what if you used a large V-series blower like a 12V-92 and geared it down to 1500-2000 rpm and ran it inline with the crank (in front of the engine). It would be a cheap way to put a blower on a digger. Then you don't need any high speed modification of the blower. Machine your own drive components and run some ducting to a standard manifold. Not to mention that the large blowers are almost worthless. I was up at a ship dismantler a little while back and he would sell a good used 12V-92 for $50.

 

About the 6-53.. I am going thorough this right now. The do not have any bearings to speak of in the end plates. not even a set of bushings. The rotors run on a film of oil. You will have to build your own end plates to hold any bearings nobody makes these also there are not any intake manifolds built for em so that will be a home built item also. The closest thing to them that you can buy are the Weiand 144 series The end plates wont fit either I tried...

Dawg

 

I threw a Holley/Weiand 144 on my latest Flattie- 6psi runs great, reliable... A buddy of mine had a bit of trouble trying to get an original 3-71 to run on his, so he ended up running a B&M version of the same size, which ran ok. Another pretty trick idea that we did was to run a McCulloch blower from a T-bird (generator-style mount with the variable drive pulleys) into a set of 84's which made realistically ~3lb of boost, but worked pretty well. (Sorry to irritate the Stromberg-devoted...)

I can give more details on the Weiand path if you're interested, otherwise best of luck. Note this is all on Ford Flathead V8's.

Later- Big Daddy

 

interesting thread.. I know a guy with a gmc v-8 diesel, it was for sale. I could probably get the blower off it cheap, but I didn't know if it was worth messing with. I have no use for a blower myself, but I was figuring it was worth something for trading.

 

is that real?

 

I'm running a 471 Detroit blower on a slant six in my modified. I'm using the stock bearing plates, un-pinned rotors, with high speed bearings installed on a home made intake and I put 15 pounds on it occasionally and have not hurt it in the last four years.
This is turning the motor to 5000 rpms and the blower is 10% overdriven.

 

I just need some help on how to calculate the boost
i mean what ratio blower drive do i need to put on my blower (6v53) to feed my flathead (276 cui)

is there some kind of formula?

does my blower need oilpressure form the motor, or can i put oil in the blower to lube the bearings and the gears?

what oil?

i read someting about highspeed bearings?.........

 

I have seen a couple of marine 6-71's with a funky green coating, or black wrinkle finish that I can get cheap super cheap. Noone wants the ones with the anti-corrision finishes for their cars...

I would run one

What would be required to run one of these on a SBC? Intake and carb adaptor, and blower drive system. but waht else?

What about the rotors? Double pinned?
The gears? If they are cast iron, they have to be changed right?
Bearings?
End Plates?

 

Mr Classics I know a guy with a shelf full of 'em factory reconditioned. They still need to be converted for automotive use, but those parts are easy to get.

I'm pretty sure you can get into one cheap and the guy may even loose the pieces to covert one for ya.

 

figure about 6-8 psi if the blower is for a deisel the same displacement as the engine you're putting it on...

6 x 53 = 318 cubic inches, so you'd need to underdrive it 10% to 15% to keep the boost down to that level.

This is what we engineers call a SWAG (silly wild ass guess), you'd probably want to talk to a blower company to get a better estimate. But at least it's a starting point.

 

The 6V53 doesnt have any real bearings in them they have to be run with positive oil pressure even then I am not sure how one will hold up in a high performance situation. There are not any bushings in the end plates the shafts are a odd size so they have to be turned down to fit a bearing and new end plates also have to be made to mount the bearings. It is a big job to make one work.

Dawg