I was at the junkyard today and Stumbled across thiese detroit motors- I think they are 8-71's with blowers ! They are for sure 8 cylinder motors , The junkyard guy says $100.00 each.... What you think should I get em? Are they 8-71's?
they are 8V. Not quite the same thing. No mounting flange. Also there never was an 8-71 blower made by GMC...the inlines only were 6 cylinders
The 8v-71 and 8v-92 detroits came with L8-72 huffers. No intakes made that i know of to use em, and even then they'd have to be converted to gas.
From what I've observed of inline vs V configuration Detroit blowers, the inlines have straighter downsides vs. the V rounded inward downsides. Detroit offered engines in 53, 71, 92 cid per cylinder displacement in inline and V formations, to include 12 cylinders and maybe more in V versions. Squirrel is correct on the 8-71 answer as Detroit didn't offer an inline 8-71 engine.
Strange they look like 8V-71 blowers, not 6-71 blowers. After all, they are V engines, not inline six cylinder engines, and the blowers are on top, not on the side. Here's what a 6-71 engine looks like, so you'll know
Would that like being tickets to a concert that you paid too damn much for the ticket and don't like the foundation of the band you paid sooo much to see?
8V71 blowers like these are the source for 871 rotors. This is how 871's came to be, blowers bigger than this required pining a cut piece of another rotor to the end to extend them. the 1271 I had on my car was made this way. Now the big buck blowers have billet one piece rotors.
Just fab an intake, or weld a plate to an exhisting 4bbl one, and for the guy who said they are expensive to rebuild, Why??? Just add a pin to the rotars, bigger capasity front and rear covers and a brace around the bearings and run the f'ers
Where do you get blower drives and end plates for these? I saved off of some V8 but the case is lower than a inline case I can't find anything to fit the blower. I,m not concerned with carb mounting or making a manifold but if I can't get drive parts it's junk.
Check out dyersblowers.com. Blowers are alot easier to work on than people think. The biggest thing about converting a standard diesel blower to gasoline configuration is changing end plates for the right bearings and running looser clearances. A 71 or 92 series Detroit typically has a red line around 2400 rpm and we know gas motors turn higher rpms than that. The correct end plates, bearings, proper rotor to rotor and rotor to case clearancing and pressure fed oiling for the drive gears can make the conversion relatively painless.
But ive heard they are 2 to 1 drive, so on a typical underdriven gas engine..... As for parts ive been under the belief they are pretty close on most parts to a plain old standard blower, but i'm no expert, i'm only repeating stuff ive read on here
The easiest way to tell a 871 from a 671 is 871's are on V8 motors and 671 are on inline 6 cyl motors, they are worth the 100.00 each for anyone who wants to play around with blowers.......Also as Oahueli said, Bill dyer is the man to go to for blower info. Dyers made a intake that those blowers will go on, If you want to play with blowers i would buy them. As the rollers are worth the $100.00 a pair for cores.
I have a V 67-1 that Dyers did, looks good just because it's different in a Kool way & makes plenty of boost! Dyers did the snout & drive set & I believe that if your looking to run a street blower then you could do a lot worse than these pieces! Wayne
This is the blower I have .I have never worked with one I pulled this one off an engine mostly buried in a scrap iron dumpster at a shop I worked at that at one time was a big rig/bus garage. Only thing I know is it was on a V engine of some kind ,I couldn't see enough of it to get a make . From seeing the typical blower on cars at the track and at shows etc. I can tell you that the case is about 1/2 as tall as a 6-71 unit.anyone know what it is ? it turns nice and easy with no odd sounds and there are no scores in the rotors or case the engine had been in storage inside a trailer so it was a "Good engine" When put in there I was told by the boss They were "to old to bother with"When I asked why they were junking them but then there was either a 349 or 409 on a massive truck trans in the same load but too buried to get to I could only tell by the rocker covers!I wasn't there when this got loaded or you can be damn sure that motor would be in my shop now!I don't know what if any other "Gold" was in that dumpster! I only got to make the quick grab of this blower at my first break before it left for China.
use that tape measure and this link http://www.fordflathead.com/basic_measurements.html It's not a V or a -71
All I know for sure is it was V engine this came off the top between 2 rocker covers it bolts on with 1 bolt at each corner down through the top. I'd like to use it for a street motor if I can find drive parts for it.Ive emailed these pictures to that links "Contact Us"
Detroit also made 6V-71 engines that use a shorter blower. I remember when all of these blowers had at least a $500 core charge. Not many of the two cycles left. I've worked on 3,4,6,V6,V8 and V16 2 cycle Detroits.
Contact Rick Dean @ Dean's Blower's up in Lillawup Washington. I'm converting an 8v71 now to run on a motor. He's got all the items you'll need. To put carbs on the top, you'll have to do some drilling and tapping to make a standard carb adapter work. You can get drive components from all the major blower shops. As far as intake, back in the day, Dyers did make an adapter - before the blower intakes as we know them now are available. I took a piece of 1" aluminum, and had it machined to bolt to the top of a standard blower intake and then had splayed pockets milled, drilled and tapped for the "V" bolts. Other ideas for mounting are to get a piece of AL, drill it for a dual carb intake, use counter sink hardware to attach it to the intake, and then bolt your blower to that plate.
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