supercharged V12 2 stroke

Ha ha I just googled the hucks starter and now know what you were on about, that's actually not a bad idea LOL. thanks for all the kind words you guys it really helps to overcome the frustration of stuff not working out as per the plan. I am currently busy trying to get the new starter under way and will update the thread when I have something to show for all my efforts. As for the starter speed query, the problem with the starter i was using is that the internal friction (new engine) and the fact that this engine has 12 compressions happening every crankshaft revolution means there's a lot of load on the starter and it simply didn't have the running torque to handle it for any length of time, so consequently it ended up hand grenading itself into oblivion........hence the requirement of a new starter motor. I am also currently redoing the carbs and intake manifold to increase the airflow into the blower.

cheers for now

Dean

One of my nephews uses a motor bike starter motor (don't know it's origin, but he had an 1100 cc Kawasaki), it's about 150 mm L by 50 / 60 mm dia, he uses it for starting a 15 cc GP engine on a RC Hydroplane, it just needed a small pulley to fit over the helical gear milled on the shaft.

Ian S C

Congratulatiojs Dean, that's a brilliant achievement - finally lived up to the title of the thread!

Perhaps you will shame me into getting my single cylinder engine working

Neil

Hope you share it with us all Neil, love to see it mate.

cheers

Dean

Incredible workmanship and dedication. I don't have the attention to detail or fine skills to do anything like this. I've often said I'm closer to an agricultural engineer than a workshop.

Pity there was so much bickering about whether this is technically scavenge pumped or supercharged early on. Either way, there's certainly no doubt it works!

It seems to have run out of carburettor or is possibly strangled by the supercharger flow rate (pulley ratio?), so hopefully you can optimise whatever it is. You may need to bolt the bench down!

Murray

Absolutely brilliant Dean, an inspiration.

Thank you

Alan

Well it has been a little while since an update, but I have not been completely idle.I have been working away on turning the starter acquired on trademe into a usable model engine starter, photos below show the progress to date

That's all for now

Dean

When I was working as an auto electrician on heavy goods vehicles (all diesel) back in the 1950's, I made a trolley Acc as it was known by the fitters. Any one member Leyland, AEC, Perkins and Gardner , not a foreign make in sight those days. Actually the trolley Acc was 5 large 6 volt batteries connected in series ,all fastened to a 4 wheel trolley, with a pair of very large jump leads, one directly connected to the common Neg with a very large croc clip on the free end. The Pos lead had croc clips on both ends. After an engine rebuild, the engines were very stiff, so a 12 volt starter got 18 volts and 24 volt 30. All the auxiliaries were disconnected and I never had a burnt out starter motor. The same arrangement was used to start some old lorry engines after a frosty night. So you might consider doing the same if your starter is short of grunt, give the starter a few extra volts. I fitted a 12 volt dynamo as a DC motor, using 18 volt on a small hoist, lifting things out of the degreasing tank. Best of luck with your fantastic project. John

Hey thanks for the info John, I reckon this starter will be more than adequate for my engines. Have also started to carry out the mods to the engine itself, starting with the intake for the blower.photo below shows the initial layout change.

will update with photos as things get completed.

cheers for now

Dean

So we are well under way now with the mods and the engine has been completely stripped down. The first thing on the list of must do's is the enlargement of the intake ports and the supercharger exhaust ports which has now been done. Photos below show the progress to date.

The intake ports have been increased by 50% of the original diameter with the exhaust by 25% and also being trued up with the manifold and block holes to make good gas flow. ( bit of a noob mistake that but never mind all fixed now).

Next is to do the toothed belt drive, backplate and cover and to dial in the transfer timing to make sure it is what it's supposed to be and maybee advance it by a few degrees. I will keep you all updated as soon as I have things done. Also I am building my anodising plant so I can add some colour to this engine.

cheers for now

Dean

Just a quick heads up, I have finished modifying the two toothed belt gears I got from belting online to fit on the V12 and am now in the process of making the drive belt housing and cover, these will both be anodized with the two heads, fin blocks, prop driver and spinner nut. I will upload photos later on tonight time permitting.

cheers

for now

Dean

Looking forward to you next instalment Dean.

+1 for that, great stuff!

Ok so here are some photos of the progress to date with the mods etc being carried out on the v12

dismantling after the first few runs to check engine condition and carry out modifications to improve performance, looks etc.

having removed the crankshaft it was discovered that the lubrication of the main bearings was somewhat less than ideal so a bunch of corrective mods were carried out on the bearing shells to allow a greater influx of lubricant to the main journals. The next engine will allow for pressure fed lube straight from the blower to ensure good lube at the mains.

The photo below shows the crank and bearings etc all refitted to the block and the supercharger refitted after the described mods were carried out.

here are the photos showing the progress on the toothed belt drive being fitted at the moment. the drive speed has been increased to 3.47 to 1.........

machining the bottom gear to fit the standard carrier I made previously.

All fitted up the the carrier..........

Now I only need to finish machining the belt cover housing and cover plate....... and by that I actually mean start maching it LOL....

untill next time.

Cheers

Dean

Well here's the latest development for the belt drive cover.........

Milling out the inside of the backplate.........

End of the roughing out stage 1, cover plate next then bolt them together to finish off the profiling.

Cheers for now

Dean

So I have managed to make a bit more progress on the toothed belt drive for the v12, photos below show progress to date...................

cover plate.

cover plate roughed out ready to finish to the back plate outline......

all finished and bead blasted....

Rear view of case.

Idler slash tensioner pully.......

Test fitted to make sure it's all going to turn afterwards lol..........

Better put the cover on to make sure its all still going to turn

Cheers for now........

Dean

So it's been a little while since I last updated this thread so i though it was about time I pulled finger and got something done, here's the latest goings on with the anodising setup.

Now where did I put the acid?

Cheers for now

Dean

Maybe you would have more time for the engine if you did not waste so much time fixing old cars!

Acid is a bit hard to get these days in NZ, I believe someone threw some at someone once. It doesn't matter for pickling boilers since there are readily available alternatives that are better, but of course for anodizing you need the real thing.

John

LOL, Yea but if I didn't fix the cars I'd have no money for anything so its a catch 22 really, Oh well, anyone know a rich donner????? no? bugger I'll have to keep at it then....... Hopefully I'll have the starter back together soon as well. Oh, and i found my acid, got a 20 ltr container of brand new batt acid a few years ago just for a job like this.

Not to long before some colour arrives on the parts i hope

Cheers

Dean

As a recent new member I haven't followed this thread before. I was amused about the 'discussion' of superchargers, turbos etc., because large, slow running marine engines of this type have been around for a loong time. Even high revving diesels heve been in use for around 70 years (3000rpm Detroit diesels as fitted in trucks and tractors, per eg). Everyone should know that they need crankcase compression (in the case of motorcycle engines, per eg) or a forced (blower) feed for others, such as the detroits. The detroits have a poppet valve for exhaust, so are probably easier to turbocharge as well as being blown. The difference is that any turbo engine of that type still needs a blower - turbos give no bost until spooled up whereas Rootes type blowers are positive displacement machines. One reason why the blower speed has to be in a fixed ratio to the engine speed in these old engines. Modern electronically controlled fuel pumps can more easily control the injection fuel/ratio, but most of these Detroits in 'pulling tractors' just inject soo much excess fuel that they smoke more than the proverbial train.

Anyway, I will now go back and read this interesting build. Very well done, Dean. I doubt iwould ever make one as complex as that. A veritable masterpiece. Do you intend flying it? How much power are you expecting?