Author Topic: 90 degree V twin engine (my own design) (Read 36205 times)

gbritnell · « **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

gbritnell · « **Reply #1 on:** January 03, 2010, 08:59:22 AM »

Some more pictures.

gbritnell · « **Reply #2 on:** January 03, 2010, 09:00:03 AM »

One last shot.

Bernd · « **Reply #3 on:** January 03, 2010, 10:01:04 AM »

George,

That's some real nice fabrication job.

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

Bernd

S_J_H · « **Reply #4 on:** January 03, 2010, 06:53:27 PM »

Beautiful! Fantastic work!!!

Steve

gbritnell · « **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

gbritnell · « **Reply #6 on:** February 17, 2010, 06:09:01 PM »

The next few shots are with the engine assembled and the intake manifold fitted.

gbritnell · « **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.

gbritnell · « **Reply #8 on:** February 17, 2010, 06:16:38 PM »

Here's the final pics of the carb.
George

tinkerer · « **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.

Bernd · « **Reply #10 on:** February 17, 2010, 08:21:23 PM »

Nice looking engine George.

Can't wait to see and hear it run.

Bernd

Stilldrillin · « **Reply #11 on:** February 18, 2010, 03:30:35 AM »

Beautiful work George.....

David D

GArat · « **Reply #12 on:** February 19, 2010, 07:22:49 PM »

Great poject....well done!!!

Best regards
Mauro

gbritnell · « **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

gbritnell · « **Reply #14 on:** February 19, 2010, 08:46:33 PM »

A few more shots.
George

Krown Kustoms · « **Reply #15 on:** February 19, 2010, 08:48:28 PM »

I love it so far and cant wait to see it run.

Brass_Machine · « **Reply #16 on:** February 19, 2010, 09:45:35 PM »

Wow George!

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

Eric

gbritnell · « **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

Brass_Machine · « **Reply #18 on:** February 20, 2010, 01:55:00 PM »

Very cool George. I look forward to it

Eric

gbritnell · « **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

Brass_Machine · « **Reply #20 on:** March 02, 2010, 02:09:16 PM »

Looking good so far!

Would love to see some on the bender.

Eric

Darren · « **Reply #21 on:** March 02, 2010, 02:18:27 PM »

Very, very impressive work

gbritnell · « **Reply #22 on:** March 02, 2010, 02:36:35 PM »

Hi Eric, I'll post a separate thread on the bender.
George

Bernd · « **Reply #23 on:** March 02, 2010, 07:00:46 PM »

Holly exhust pipes batman

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.

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

Bernd

dsquire · « **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.

Cheers

Don

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Author Topic: 90 degree V twin engine (my own design) (Read 36205 times)