Author Topic: 90 degree V twin engine (my own design)  (Read 27786 times)

Offline gbritnell

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90 degree V twin engine (my own design)
« on: January 03, 2010, 08:41:34 AM »
Gentlemen, here's some progress shots of my current project. It's a 90 degree V-twin engine, 1.00 bore 1.25 stroke, air cooled and pressure oiled. Everything is machined from solid material. The crankcase is 6061 aluminum as are the timing cover and rocker arms. The crank is 1144 steel and the rods are mild steel. The valves, keepers and spring holders are stainless. I designed it several months ago and got started on the build shortly after.
George

Offline gbritnell

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Re: 90 degree V twin engine (my own design)
« Reply #1 on: January 03, 2010, 08:59:22 AM »
Some more pictures.

Offline gbritnell

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Re: 90 degree V twin engine (my own design)
« Reply #2 on: January 03, 2010, 09:00:03 AM »
One last shot.

Offline Bernd

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Re: 90 degree V twin engine (my own design)
« Reply #3 on: January 03, 2010, 10:01:04 AM »
George,

That's some real nice fabrication job.  :thumbup:

Nice finish. I take it that is was done with a grinder, files and sand paper?

Bernd
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Offline S_J_H

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Re: 90 degree V twin engine (my own design)
« Reply #4 on: January 03, 2010, 06:53:27 PM »
Beautiful! Fantastic work!!!  :bow:

Steve


Offline gbritnell

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Re: 90 degree V twin engine (my own design)
« Reply #5 on: February 17, 2010, 06:06:25 PM »
I know alot of you fellows follow the other forums. I haven't been up-to-date on posting the progress on this engine because of the amount or work involved in posting elsewhere. I thought I would post some information on how this project is going. I have all of the major components made. The ignition and exhaust remain along with small odds and ends. I have the engine assembled for fitting the intake manifold and mainly just to keep everything together. As you can see from the photos I have accomplished a lot. With any luck I should be able to see if it will run around the end of March.
George

Offline gbritnell

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Re: 90 degree V twin engine (my own design)
« Reply #6 on: February 17, 2010, 06:09:01 PM »
The next few shots are with the engine assembled and the intake manifold fitted.

Offline gbritnell

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Re: 90 degree V twin engine (my own design)
« Reply #7 on: February 17, 2010, 06:14:57 PM »
Within the last few days I have finished the engine base/motor mount and the carburetor. Although the carb is just a simple air bleed type I wanted it to look like it was made for this engine so I prettied it up by adding dummy pieces to it like the float bowl and upper barrel and cap. The upper cap was made to look like the cap on a motorcycle carb that holds the slide and spring in place. On my carb it is set screwed to the throttle barrel and will serve as the throttle link. I even went a step further and added a dummy cable adjuster to the top.

Offline gbritnell

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Re: 90 degree V twin engine (my own design)
« Reply #8 on: February 17, 2010, 06:16:38 PM »
Here's the final pics of the carb.
George

Offline tinkerer

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Re: 90 degree V twin engine (my own design)
« Reply #9 on: February 17, 2010, 06:39:44 PM »
I love watching you guys building these things. Not to wish my life away, but can't wait til the end of March.
Tink

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Offline Bernd

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Re: 90 degree V twin engine (my own design)
« Reply #10 on: February 17, 2010, 08:21:23 PM »
Nice looking engine George.

Can't wait to see and hear it run.

Bernd
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Offline Stilldrillin

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Re: 90 degree V twin engine (my own design)
« Reply #11 on: February 18, 2010, 03:30:35 AM »
Beautiful work George.....  :thumbup:

David D
David.

Still drilling holes... Sometimes, in the right place!

Still modifying bits of metal... Occasionally, making an improvement!

Offline GArat

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Re: 90 degree V twin engine (my own design)
« Reply #12 on: February 19, 2010, 07:22:49 PM »
Great poject....well done!!! :clap:
Best regards
Mauro

Offline gbritnell

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Re: 90 degree V twin engine (my own design)
« Reply #13 on: February 19, 2010, 08:45:03 PM »
Today's update. I took the manifold off and bored the hole for the carb. It's a snug fit but will also have a small set screw in the bottom. I then made up an air cleaner cover and back plate. I didn't have enough room between the inlet tube on the carb and the head on the adjusting screws so I made the backplate a little bigger and drilled out the holes for the screw. I then relieved the back side around the boss and screw holes. The cover was machined and buffed, after which I drilled all the holes. I did it this way so that the buffing wouldn't round over all the holes. I thought that a shiny piece or two would contrast the finishes on the rest of the pieces.
George

Offline gbritnell

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Re: 90 degree V twin engine (my own design)
« Reply #14 on: February 19, 2010, 08:46:33 PM »
A few more shots.
George

Offline Krown Kustoms

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Re: 90 degree V twin engine (my own design)
« Reply #15 on: February 19, 2010, 08:48:28 PM »
I love it so far and cant wait to see it run.
-B-

Offline Brass_Machine

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Re: 90 degree V twin engine (my own design)
« Reply #16 on: February 19, 2010, 09:45:35 PM »
Wow George!  :bow:

I love the engine! Do you plan to release the plans for it? I would LOVE to build it!

Eric
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Offline gbritnell

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Re: 90 degree V twin engine (my own design)
« Reply #17 on: February 20, 2010, 07:40:02 AM »
Hi Eric, I have a complete set of plans for it. I'm up to 14 sheets now. I won't offer them till I'm finished with the engine, that way everything will be corrected for the next guy.
George

Offline Brass_Machine

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Re: 90 degree V twin engine (my own design)
« Reply #18 on: February 20, 2010, 01:55:00 PM »
Very cool George. I look forward to it

Eric
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Offline gbritnell

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Re: 90 degree V twin engine (my own design)
« Reply #19 on: March 02, 2010, 01:57:50 PM »
Here's an update on the engine. I wanted to built the exhaust from .375 stainless tubing. I didn't have a bender sturdy enough to do the bending so I had to make another one. In my experience bending tubing, even with a good bender I get somewhat of a flat on the outside radius of the pipe. I spoke with a fellow builder and asked if he had ever used Cerro alloy to fill the tubing prior to bending. He said he did and had good luck with it. I ordered a small cube from Ebay (expensive stuff!)
 Once the alloy arrived and I had the bender built I set about bending the tubing. I put the alloy in an old coffee can and put this into boiling water, the alloy I got has a melting point of 154 degrees. I filled the first piece of tubing and when the alloy cooled I took it out to my big shop vice and proceeded to try out my new process. I clamped the tube into the bender, put a 12" adjustable wrench on the lever arm and started bending. It bent much easier than I thought it was going to. I took the piece of pipe out of the bender to check the bend, wow, absolutely perfect, no flat spot whatsoever.
 Now it was just a matter of making up the other bends and slowly fitting everything together. Being that the front exhaust pipe had to pass through the motor mount I decided to make it in two pieces and silver solder it together. The construction of the bender and the radius that I used wouldn't allow me to get two bends close together and beside that I didn't know how many pieces of pipe I would go through trying to get a good one.
 The rear pipe required different bends than the front pipe because I wanted it to stack on top of the front pipe. I think I have about 24 hours in the bender, cutting the tubing, filling with alloy, bending, melting the alloy out, filling and fitting the pieces and silver soldering everything together.
 I must say that I am quite pleased with the outcome. Even with the small connecting sleeve on the pipes I think it looks good.
 The first several pictures show the fitting up of the front pipes. I turned down a piece of aluminum to locate and support the pipe for soldering.






The next pictures show everything polished and assembled.
George














Offline Brass_Machine

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Re: 90 degree V twin engine (my own design)
« Reply #20 on: March 02, 2010, 02:09:16 PM »
 :jaw:


Looking good so far!

Would love to see some on the bender.

Eric
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Offline Darren

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Re: 90 degree V twin engine (my own design)
« Reply #21 on: March 02, 2010, 02:18:27 PM »
Very, very impressive work  :bow:
You will find it a distinct help… if you know and look as if you know what you are doing. (IRS training manual)

Offline gbritnell

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Re: 90 degree V twin engine (my own design)
« Reply #22 on: March 02, 2010, 02:36:35 PM »
Hi Eric, I'll post a separate thread on the bender.
George

Offline Bernd

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Re: 90 degree V twin engine (my own design)
« Reply #23 on: March 02, 2010, 07:00:46 PM »
Holly exhust pipes batman  :jaw:

Nice job George. As I was reading this part of the thread I was about to say that I read else were of a guy doing what you were going to do. Then the bulb went on as to where I'd seen this before.  :doh:  :lol:

Hope to see a vid soon of it running. It's got to sound sweet.  :ddb:

Bernd
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Offline dsquire

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Re: 90 degree V twin engine (my own design)
« Reply #24 on: March 02, 2010, 09:27:37 PM »
George

It is a pleasure as usual watching you carve the swarf off of a chunk of metal to reveal what is hiding inside. You seem to have such a delicate touch and know just how far to go to get the maximum effect. A real work of art in my book. I will be looking forward to you thread on bending pipes as that is something I think will draw a lot of interest.  :ddb: :ddb:

Cheers  :beer:

Don
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