View Full Version : Mutant-Guzzi Build.

10-10-2010, 4:15 PM
So, I've had this basket case 1600cc VW motor cluttering up my shop for a while now, and I just found an old 1973 Guzzi Eldorado that someone wrecked, and left for dead in a cornfield back in 1979-80.


and I've done some research. People have put VW motors in guzzi frames before, but used 120cc motors.

I've discovered that if I shave 3/16" of an inch off the 1600cc block, it will fit in the frame. So I'm in the process of tearing down the corpse of the eldorado, and then I'm going to clean it up.

More pix to follow.

10-10-2010, 4:46 PM
that sounds nuts! im definately interested to see how it pans out.

10-10-2010, 7:21 PM

The front end is salvagable, altho I'm going to have to make a new top to the trees, I think. the old one is bent pretty bad. New headlamp nacelle as well, the old one's pretty much toast. Front fender needs a few dents knocked out, and the wheel is good. forks still actuate smoothly!



Lots of room to install the new engine. I'm machining the changes to the VW block because well, 1600cc blocks are cheap, and plentyful. Salvagable guzzi frames... not so much.


And now we come to the stinky part. You see that curve just past where the rear shocks bolt to the frame? that nice, graceful curve? yeah, that's not supposed to be there. Cant decide wether to work with the damage present, or try to bend it back. I'll think on it, while I'm fixing everything else.









and that's the beast so far. intersting, no?

10-12-2010, 7:56 PM
definately interesting! on one hand its a shame somone let such a cool bike go to tshit like that but on the other its cool to know its in the hands of someone who's gonna resurrect it.

10-12-2010, 8:51 PM
Thanks, I"m doing my best. I"m a bit concerned about rebuilding the drive train. it's been sitting for a long -long- time. The frame, tin and electrics will be easy. Sourcing some of the suspension and drivetrain bits is going to be difficult. I'm having a hard time finding forks parts for it.

insertion of the 1600cc motor is going to require extensive machining.

a quarter inch will have to be shaved off the oil box at the bottom of the block on both sides. I dont think the case walls are thick enough to cope with this, so each case side will be shaved 1/4", and a 1/8" plate welded back in. Since crankcase pressure is minimal, it shouldn't be a problem.

the mounting flange will be shaved 1/4 of an inch, so that an adapter plate can be flush-mounted to the block, making the entire engine/transmission unit fit in the frame.

I'm considering trimming the engine mounting flange to match the size of the guzzi's tranny, and mounting new studs in the block to match the mounting holes in the transmission. it'll also look a lot cleaner without all that excess flange materiel sticking out.

10-13-2010, 4:01 AM
fun project - lots of work but interesting. im sure you have seen this one but its some eye candy if you havent

http://f.imagehost.org/0628/VW_bike.jpg (http://f.imagehost.org/view/0628/VW_bike)
http://f.imagehost.org/0515/Starting_the_VW.jpg (http://f.imagehost.org/view/0515/Starting_the_VW)

10-13-2010, 11:35 AM
Man, that white one is gorgeous. I finally drug this /2 BMVW home a few weeks ago after working for like 2 years to make a deal on it. Haven't had time to make it run yet.



10-13-2010, 12:46 PM
very nice, both of those. I've got a spare 5speed R100 tranny around somewhere, I was thinking about doing this project in a BMW frame, but then the really cheap guzzi frame fell into my lap.

10-13-2010, 9:23 PM
and it's time for new pix.


here's the rear end

it's jammed solid, but not broken. I should be able to de-rust it and get it spinning again. we'll see soon enough.


And here's the frame with the tranny still in it, before I managed to pry it out.


And here it's still stuck. I had to cut one of the bolts on the engine, but the engine case is junk at this point, anyhow.


And here's the tranny on the bench... yay!


Another shot of the tranny, it's not siezed, but does not shift... worrysome.


And here's the frame sans transmission & rear end.


Here's the gear cluster, it's a touch rusty, but all the dogs and gear edges look clean.


The cause of why it does not shift, and possibly why it was left in the cornfield. That's a broken shift lever return spring. it was bouncing around loose in the case.


A shot of the inside of the case... icky, but fixable.


And here's a shot of the potential line-up.

So the round up-

I"m a bit worried that I"m going to have to buy a new tranny, because the contents of the case are a bit funky... we'll see how it pans out.

If anyone knows where a junk tranny/rear end can be found, I'd appretiate it.

10-13-2010, 10:37 PM
This is going to be neat watch. I've seen a VW powered Guzzi once in New Mexico a couple years ago. Dude said it was fast as hell but prone to overheating. Obviously sitting in traffic in the southwest would not be the best for a VW with no fan shroud. Have you considered running a oil cooler with a fan like a baja bug? Ugly for sure but might be handy depending on what your goals for riding are.

10-13-2010, 10:48 PM
the build calls for 'the biggest oil cooler I can find'.

I"m betting that cooling is going to be an issue, so I'm hoping to use an oil radiatior with a least a 1.5qt capacity.

10-14-2010, 12:01 AM
These guys sell a bunch. I'd recommend a cylinder head temp gauge too. That always seems to be the issue when hot.


10-14-2010, 8:31 AM
This guy found a vw-powered guzzi. Maybe the pics tell you some good stuff for your build.


10-14-2010, 2:49 PM
what I'd really like to find is the adapter fittings, so I can copy them, instead of having to figure them out by myself. I can do it, but it saves me some time.

10-14-2010, 7:52 PM
This might be one of the most intersting builds have followed. Keep it up and good luck.

10-16-2010, 12:34 AM
i love vws, and bikes... good combo! following this build for sure

10-16-2010, 5:04 PM
Well, I got the swingarm torn apart today, and there was a small blessing. the rear rim is bent, but the hub is ok, and the final drive seals are intact, and the inside was not rusty, so that's one part I dont have to fiddle with.

The tranny's pretty rough, I'm not sure if I want to shelve it for spare parts, or try to rebuild it. jury's out, until I get a better line on parts for it.

I'm tempted to dump the guzzi drive train, and use a BMW tranny and final. Time, and pricing will determine that.

10-17-2010, 4:18 PM
keeping an eye out on this. there used to be a swedish co that sold a hardtail for vw motors. i always wanted one.


10-17-2010, 7:07 PM
It's official, the guzzi tranny is a sinker. too many corroded/broken/missing parts.

So I'll be hunting for a new tranny, I think. that or going with a BMW tranny. I've got a box of dead 5 speeds with blown out input splines that I coud recut to fit a VW clutch plate.... bears thinking about.

10-28-2010, 6:24 PM
any updated pics man? this thing is interesting as hell

11-24-2010, 4:48 PM
Build is currently on hiatus, due to work and weather. please note, I -will- be back at this, as weather,time and money permit.

07-06-2012, 1:34 PM
Ok I lied. I had to sell the bitch. I had to move, and just couldn't justify it. I am however, still working on a VW powered bike.