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This will be my final report on the 60 degree Vee Twin design. Having made 2 engines, one a sideport, the other a conventional shaft induction port and now having had the chance to appraise them with various "experiments" - I can say that the inefficiencies inherent in the plain 2 stroke...

For all you waiting to see if it runs ... YES ... it does !! This morning ran both cylinder/pistons in on No1 position ... No2 gave 6100 and No1 gave 6150 on my rpm meter so give or take both about the same. No1 was a tighter fit than No2, but after about 15 minutes running each, both have...

Finished all the bits today cleaned them in the ultra-sonic twice then assembled what will be No2 cylinder into No1's hole. Mounted it and it was running pretty after about 15 minutes of flicking. Had it way too rich. Interestingly it ran backwards really well for the initial more than a prime...

Woodster, Thought about that but hitting a 1mm target 22mm away right in the middle after going through multiple layers was beyond what I thought was possible. So in the end decided to try the process above which worked surprisingly well. Whenever you hurry a job you always risk an error as...

Managed to break the tip off a tiny No1 HSS centre drill in a piece that had about an hour and a half invested in it. Was the last of the 4 PCD holes for the muff on the 60 degree Vee twin I am building and was within a second or two of withdrawing the drill - always the way. Certainly learnt...

A bit more progress Getting closer, just contras, tommy bars, venturi, muff hold down holes and a few other little jobs to go. Plan is to run it as a single with No2 blanked off to run in the piston/cylinders and to find a reasonable setting as a datum. The photo of the circles is the way I...

Crankcase done - about 30 hours work. The 2 pots are left-overs from my build of the Owen Mate some 12months ago - ones I wasn't happy with at the time. Hopefully my skills have improved and I will be happy with the 2 I make this time around. Plan is to blank off No2 pot and run both No1 and...

Thanks Neils, have asked if the thread name can be changed - a little while ago now I must admit. Ran Sydney Motorsport Park with the Brabham - managed a 3rd and 2 - 4ths with about a 30 car grid, so pretty happy with that. Now back to the serious stuff ! As the photos show have made a start...

OK, here we go again ! As mentioned earlier, the next engine will be based on the Owen Mate, which was the 2nd of the engines I have made. It is a wonderful design by David Owen and I think lends itself to much more experimentation than the Butterfly mainly due to its generous porting and shaft...

Ran the butterfly again today and the inner ball bearing failed, almost locking the engine up. Pulled it apart and replaced it and whilst I had it apart I shortened the crankpin which was about 20thou too long. Reassembled it and had it going without too much flicking - but realize now it really...

Have got a 8 second clip of it now on YouTube ... Go to http://youtu.be/D8FZ26UPFr4 The sound is quite distinctive when its running on both cylinders. I have longer video of it, will edit and load it later. Will also record my thoughts here later for the next design using what I've learnt...

A few more thoughts. Firstly about what happens inside the engine. No.1 cylinder is really supercharged at the expense of No2. When the piston uncovers the transfer port for No.1 - No.2 piston is still decending boosting the gas into No.1's transfer port; however the opposite happens with No.2...

Spent yesterday running the two piston and liners in on the Midge. No.2 would not run consistently but No.1 after 5 minutes was the equal of the Midge. Put No.2 back in this morning and still the same (funny that) :D things really don't heal on the shelf - so as all the components were within a...

The Midge is a typical sideport ... the Butterfly uses the same cylinders one a mirror image of the other ... Exhausts are on the outer sides of the cylinders .. .

Have spent quite a few more hours on the Vee Twin based on the Midge - and have now decided to call it the Butterfly. :) Everything is made now and this is a trial fit up without the pistons and conrods installed. I think I will run the pistons and cylinders in the Midge to start with to get...

A bit more progress ... Pistons and contras next then venturi/carby and drive washer, compression screws and backplate. .

Hi Kadora My grandfather was born in Liptovski Ondrej near Mikulas he went to USA when he was 16 married a Slovakian girl and later my dad was born Newark NJ. Then around 1919 the family went back to Slovakia and 6 years later grandfather came to Sydney Australia - then a year later grandma...

OK back from the GP - On the track everyday but Sat was the best day - 20+ minutes and finally learnt the track enough to have a decent run, weren't many cars left in front at the chequered flag but it was only a demo. ;)The car would have felt at home running in the AGP's 1964, 1965 and 1966...

Have just about got the crankshaft finished along with the crankcase. Next job is to make the conrods and see if I can get them to fit with the space available. Will be very tight as usual and might have to relieve the rear of the cylinder a bit which won't affect the seal. But will come to a...

Had a hankering to build a twin and after recently building an ML Midge thought it would be a good basis to go down this line of thought. There is a horizontally opposed Midge and it is called the Dragonfly, but I could find little about it on the Web. So I thought why not build a Vee. Some...