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Old November 12th, 2009, 05:40 PM   #1
busguy71
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Default 1/2 VW engine

In ultralights they use a custom 1/2 vw engine that is the front 2 cylinders of a vw case and weld (or a full custom case, dont know) the rear face back on, with custom short crank and cam for that short case. Has anyone run a full a full vw motor with just two diagonal pistons removed? I think if you weld up the holes in the crank it would work, I just have no idea about balancing engines. You could make an 800cc motor that would probably get sick MPG if you lightened the car. Comments/pics?
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Old November 12th, 2009, 06:00 PM   #2
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Default Re: 1/2 VW engine

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Old November 12th, 2009, 06:03 PM   #3
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Default Re: 1/2 VW engine

looks like that kit uses the front two cylinders with the custom crank, I wonder if you can do it with all stock VW parts.....
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Old November 13th, 2009, 06:11 AM   #4
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Default Re: 1/2 VW engine

have you seen the VW engine/compressor? they make a custom camshaft and use either the front 2 or the rear 2 cylinders to run the compressor and the other 2 cylinders to run the engine

I read an article in a VW magazine back in the late 80's or early 90's (i have it someplace) but they say that it will run a jack hammer without stopping, so they put out plenty of CFM's to run anything you can think of

if I could get my hands on one of those camshafts I would make one myself, I need a compressor that has that kind of power, I just have no idea about the camshaft, if I could get one or a drawing of one I would make it myself and build a compressor

oh I'm sorry if I started to hi-jack you thread, that wasn't my intention, only the fact that I knew they can run off of 2 cylinders like the compressor I mentioned

a 2 cyl VW engine if you did make a cutom case would be a great little engine, I bet it could power my rail and get great gas milage

thanks for the website as well
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Old November 13th, 2009, 06:17 AM   #5
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Default Re: 1/2 VW engine

At a minimum, you would need bob weights to simulate the rod/piston combo to keep the balance, on the two missing piston positions; assuming you use a std case and crankshaft. It would also be very slow. It would rev slowly due to the extra mass of the rotating assy.

I think a better solution for mpg is to build a long stroke, smaller bore engine. Mild cam and transaxle gear matched for the low-rpm torque the engine would make. Still be slow, not as bad as the 2-cylinder. Would run much smoother, and with some clean-up porting and header all designed to keep the port flow velocity high, it should do pretty good for mpg.

Use small single port heads, port match all the mating surfaces of the intake and exhaust so the flow is not interrupted. Single small carb, again to keep air velocity high. The goal is lower rpm torque and running real efficient. Tall gears so it like an OD, you want less crusising rpms for best mpg.
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Old November 13th, 2009, 06:29 AM   #6
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Default Re: 1/2 VW engine

someone on here was selling a VW built compressor. it ran the driver side cyls as the air pump and the pass sides were the firing cyls. also, people have been using custom two cyl corvairs hacked away. vairs make great low end grunt, about 100 hp at 2500 rpms, prop speed... so cutting them down didnt make it a complete turd.

with the two or 3 extra SP engines i have left in the garage to redo, making one into an air compressor would be a worth while venture.... either all 4 cyls to drive a compressor pump, or the 2x2 method VW used ......
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Old November 13th, 2009, 08:36 AM   #7
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Default Re: 1/2 VW engine

Many years ago on a road trip with my 63 I spun a rod bearing. I called a buddy and he came and picked us up with his race car trailer and took me to his place.

I was 4 hours from home and it was Sunday.

The next morning we went to town looking for a new crank and rod for the 1200. No body had anything and I really needed to get home to get back to work.

So we pulled the engine apart and took the crank down to the local welding shop and had the oil journals for the bad rod and the one opposite it welded up. The welder said it would never work. We said it would. So he told us if we could drive it to his shop, he would give us the money back he charged for welding it up.

We went back and put the engine together with only 2 rods and pistons and we took out the push rods for the two dead cylinders.

It started and ran. It sounded really funny, kind of like a farm tractor, but it worked. And it ran surprisingly smooth!

The trouble was it didn’t make a lot of power. In fact, we had to pull it out of the driveway with another car. But once we got it up onto the road, it drove just fine on the level and going down hill.

So we drove it the mile or so down to the welding shop and we got our money back.

But then we had a problem. It was back up hill to my buddies place and we knew it just wasn’t going to make that ride out of the parking lot at the welding shop. So we left the welding shop and continued on down hill for a few blocks and then cut over and had to tow it back up the next road (so the welder couldn’t see us) back to my buddies place.

We decided NOT to try to make the 4 hour trip home as there were 2 rather large mountains to go over on the way.

I think if we would have had more time to mess with it, we probably would have been able to get it to run better. But we were pretty limited in what we had to work with as far as the distributor and carb was concerned.

But the funniest part of the story was that engine sat in his barn for about 10 years. It was all complete from the outside. Full tin, carb and heater boxes. It’s history had been forgotten in time. But it still turned over and wasn’t stuck.

A neighbor kid of his bought a bug with no engine and more or less helped himself to that engine with out fulfilling his part of the deal. He had promised to do some work in return for the engine, but that work never got done.

He installed that engine in his car and spent several weeks trying to get it to run right. He had all the “experts” in the neighborhood come look at it and no body could figure out what was wrong with it.

Then finally, someone did a compression check and got a real surprise.
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Old November 13th, 2009, 10:13 AM   #8
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Default Re: 1/2 VW engine

Lot less work to use. BMW boxer motor.
Saw one once with a /7 motor.
65hp 1000 cc. U can find /5,/6 &/7 motors
pretty easy and not priced out of park.
Bullet proof and dependable, which in an
ultralight kind of matters. They go down
real quick.
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Old November 13th, 2009, 01:44 PM   #9
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Default Re: 1/2 VW engine

I built a 1/2 VW engine. A friend of mine has a 37 HP 1/2 VW engine on a Mini-Max, cruises 70 mph and burns 1.6 GPH. Love that sound. http://www.hummelengines.com/ Look at this site. Dan R. ( Pops)
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Old November 13th, 2009, 04:50 PM   #10
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Default Re: 1/2 VW engine

I wouldn't, unless I wanted to get run over.

There are other ways to get improved mileage.
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Old November 15th, 2009, 10:13 AM   #11
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Default Re: 1/2 VW engine

if you want to power a ultralight, why don't keep the 4cyls?
2 firing and 2 as a compressor? they work simultanius more rpms more pressure
so you can make a 2cyl supercharged car..little guestimated as much as stock hps on a 800cc engine

read about it in a motorcycle magazine, a few guys built a 1cyl supercharged bike out of a normal 2cyl bike

you'll need to raise pressure on the 2 compressor cyls and connect them to a barrel wich contains the pressured air
then connect that barrel to the inlet of the 2 firing cyls and find the right tuning for the carb..

who's up for the challenge?

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Old November 15th, 2009, 05:39 PM   #12
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Default Re: 1/2 VW engine

Do you think you could double the output of the two cylinders by supercharging them with the other two enuff to equal the normal output of the engine as a 4 cylinder?... ( long question)
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Old November 15th, 2009, 07:28 PM   #13
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Default Re: 1/2 VW engine

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Originally Posted by busguy71 View Post
Has anyone run a full a full vw motor with just two diagonal pistons removed? ?
It would run but the vibrations wouldbe bad.
It is called a rocking couple.
The vibrations of the opposite cylinders would cancel each other out but the problem would be the distance they are from each other.
It would shake back and forth from opposte ends of the crank.
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Old November 15th, 2009, 07:34 PM   #14
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Default Re: 1/2 VW engine

papa Porsche experimented with two cylinders supercharging the other back during the birth of the vw but it was a two stroke
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Old November 16th, 2009, 01:27 AM   #15
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Default Re: 1/2 VW engine

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Do you think you could double the output of the two cylinders by supercharging them with the other two enuff to equal the normal output of the engine as a 4 cylinder?... ( long question)
Like i said, it was guesstimated, these motorcycle guys had the same output as stock with their half 2 cyl supercharged..

but we'll only know for sure if someone is up for the build
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Old November 16th, 2009, 02:05 PM   #16
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Do you think you could double the output of the two cylinders by supercharging them with the other two enuff to equal the normal output of the engine as a 4 cylinder?... ( long question)
Possible, but what would be the advantage to doing it.

It take fuel to make hp, forcing more air and fuel through 2 cylinders to make the same power as 4 cyl, won't save fuel.
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Old November 16th, 2009, 02:42 PM   #17
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Default Re: 1/2 VW engine

When making a 1/2 VW engine, you have to weld extra counterweights on the crank and rebalance. They can be made to run very smooth. You can build a 45 HP 1/2 VW engine and the big advantage is light weight. ( 78 lbs ) Dan R. ( Pops)
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Old November 16th, 2009, 05:24 PM   #18
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Default Re: 1/2 VW engine

i tried to buy a bradley from this guy once and he had a 2 cyl motor in it. said it was slow to get up to speed but got great milage when it got moving...
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Old November 17th, 2009, 06:09 AM   #19
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Default Re: 1/2 VW engine

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It would run but the vibrations wouldbe bad.
It is called a rocking couple.
The vibrations of the opposite cylinders would cancel each other out but the problem would be the distance they are from each other.
It would shake back and forth from opposte ends of the crank.

You would think that, but when we did ours it was surprisingly smooth. Just didn't have much power and sounded funny!
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Old November 17th, 2009, 11:37 AM   #20
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Default Re: 1/2 VW engine

Since a few months have a car with an 2-cyl air cooled engine. Its almost identical to the 4-cyl VW engine but then half.
Its a DAF 44 from '70 with a 850cc 2-cyl boxer engine.
Build in The Netherlands. Earlier models had a 600cc or 750cc engine.











So why all the work by splitting a VW case in Half when its allready there.
Currenthly have 3 850cc's in the garage to see if I can get some more power out of them. Now they have 40pk.

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Old November 17th, 2009, 01:11 PM   #21
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Default Re: 1/2 VW engine

That is PERFECT for a trike...The whole trike could be built lighter and with less rear heavy overhang and get great fuel mileage..
850cc is enuff for an urban (in town) trike. Big horsepower isnt needed there.
Where and how do I get my hands on one of these engines?..I havent seen a DAF in a VERY long time.. criegslitst?
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