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supercharged V12 2 stroke

Methanol burning beast!!

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Nick_G10/12/2015 10:10:37
1808 forum posts
744 photos


Awesome. .............. Truly awesome. smiley


dean clarke 210/12/2015 21:09:42
155 forum posts
330 photos

Yea me too!!!!!! (can't wait to see the next bit that is,lol)

Thanks for the kind words Nick


Edited By dean clarke 2 on 10/12/2015 21:10:44

Howard Lewis14/12/2015 17:23:49
2585 forum posts
2 photos

INCREDIBLE skill and patience!

To ask a stupid question, how do you plumb four carburretors to feed six cylinders per bank?

On naturally aspirated four strokes, two carbs give equal induction pulse intervals, but often three are used.

So are all four outside the blower, feeding mixture into a common gallery to it?


dean clarke 214/12/2015 18:06:11
155 forum posts
330 photos

All four carbs feed mixture into the intake off the blower, then all six crankcase cavities are feed directly from the blower exhaust through six separate ports. each pair of cylinders in the v configuration is running in a sealed off crankcase cavity with the conrods running on a single big end journal. This gives 5 main center bearings and 6 big end journals. As the blower is one single unit there is an evening out of the mixture internally and therefore an even distribution of mixture to the cylinders.

Hope this explains it clearly?



Skel15/12/2015 22:43:50
12 forum posts
4 photos

This is very cool.

dean clarke 219/12/2015 00:23:10
155 forum posts
330 photos

SUCCESS AT LAST ,,,,,,,,,,, Finally I have been able to get all the pistons lapped in to the liners and ready to run so to speak YAY what a saga that was but all dun now and it's onto the glow plug inserts/combustion chambers, photos below show progress to date

pistons all finished.jpg

pistons all finished2.jpg

here's the glow inserts/combustion chambers....

glo insert 1.jpg

glo insert combustion chamber.jpg

Cheers for now


dean clarke 223/12/2015 08:37:16
155 forum posts
330 photos

Well, having been able to spend a couple more nights in the shed this week I have been able to complete the next stage of the engine build. Tonight saw the completion of the glow inserts/combustion chambers and the final assembly of the cylinder heads. I have also been able to modify the fuel rail and freed up the throttle linkage movement. Photos below show the progress to date............................


glow inserts done on odd side.jpg


glow inserts fitted too even side.jpg


carbs all fitted.jpg


Last photo below is the front view of the engine so far, all that remains to be done is the 4 fuel needles and the ignition rail. I think it will then be time to breathe life into the beast (hopefully)

looking decidedly more business like.jpg


Cheers for now



Edited By dean clarke 2 on 23/12/2015 08:40:12

Michael Gilligan23/12/2015 09:01:43
14570 forum posts
633 photos


I have run-out of superlatives to express my admiration.

... Now just looking forward to seeing & hearing it run.


Ady123/12/2015 10:30:27
3465 forum posts
513 photos

looking forward to seeing & hearing it run

Don't forget, it's a them run, not an it run because he's going to knock out a flat 12 at the same time, scratch built of course, heck, it gave him something to do

Edited By Ady1 on 23/12/2015 10:30:41

Jeff Dayman23/12/2015 13:52:15
1695 forum posts
45 photos

Looking great Dean, good luck on the first startup. JD

Peter Krogh23/12/2015 15:47:02
212 forum posts
20 photos

I just read this whole build log and this has to be one of the most amazing 'model' engines I've ever seen.

Just can't wait to see this monster belching fire!!


dean clarke 230/12/2015 02:39:58
155 forum posts
330 photos

WELL.......... We're getting closer to life. I have now been able to make and fit the two ignition rails and also the four needles. The engine is off the assembly stand and refitted to the running mount, fuel line is all hooked up and I am now just charging up the power unit for the glow plug ignition system and mixing up the fuel. Here are a few more photos of progress to date........

ignition rails done 1.jpg

ignition rails done 2.jpg

almost ready to go.jpg

almost ready to go 2.jpg

top veiw.jpg

Photo below shows us all ready to go with the new dog clutch starter mechanism

ready to run.jpg

Well I'm off to mix some fuel up, see you in a while......

Cheers for now


dean clarke 230/12/2015 22:20:23
155 forum posts
330 photos

Well that didn't quite go as I had planned........ the first attempt to bring the beast to life has ended in failure!!!!

Bugger! there isn't enough grunt in the power supply to light up the glow plugs!!, Now where have I heard that before..... (grumble, groan, quietly swearing) worse than that though is when I removed the glow plugs to check things I found they were all dry as a bone!!!! that means no sucking in of the fuel and transferring to the combustion chamber........ double bugger and more groans and grumbles (and a bit louder swearing!)

Ok so why is it not transferring? Simple answer.... no pressure in the pressure in the crankcase equals no pumping from the blower...... Umm how can that be ? it worked well when I tested it!!!!! Hopefully the simple answer is that the vanes have become gummed up in the slots and the starter simply isn't spinning the engine over fast enough. When I first tested the blower there was no other engine components fitted and the turnover speed was very high with the starter and the blower was freshly assembled and could be heard very clearly working. A good friend of mine has suggested the addition of a leaf spring arrangement behind the vanes to keep them in contact with the case.... I may have to follow this idea up if I can't get it to work otherwise.,, Blast!!! More work!!! Oh well I guess if it was easy then everyone would be doing it right??? Oh yea and the other little bug in the system was a slight fuel leak at the fuel rail from a split hose, funny how these things always wait until the last moment to show themselves, just to let you know they aren't going to make it easy!! So its off to the decompression chamber for me ( a few bourbons should do the trick quite nicely I think)

and then I may look at trying to resolve some of the tribulation issues with giving this engine life...IGOR YOU FOOL WHERE IS THAT EXTRA POWER!!!!!!!!!

Cheers for now


Jeff Dayman31/12/2015 03:16:45
1695 forum posts
45 photos

Did you prime the cyls a bit thru the venturis Dean? You do need a good glow on the plugs of course but you may also need a little raw fuel right down the pipes to get it primed to run, at least at first.

Looks great by the way, well done. Good luck with first startup. JD

Danny M2Z31/12/2015 05:27:24
769 forum posts
282 photos

Dean, you are nearly there, just teething probs.

As you appear to have each bank of glow-plugs in parallel, the whole 12 at 1.5V would require about 36A from your power supply (about 54W). More if flooded

An adjustable (voltage regulated to 1.5V tweakable) supply that can handle that sort of current may be required. As the plugs are in two banks, twin power supplies rated to about 30A each @1.5V may be the go, one to each rail.

As for the blower, how is it lubed? Light leaf springs could be the answer but once its up to speed probably redundant and just extra wear.

What about a metered (miniscule) prime through each plug hole just to get the blower up to speed.

I have looked at your other engines, very impressive! **LINK**

I think that many people are awaiting the video and the sound once the beastie runs.

* Danny M *

David Colwill31/12/2015 09:22:22
595 forum posts
32 photos
Posted by Danny M2Z on 31/12/2015 05:27:24:

I think that many people are awaiting the video and the sound once the beastie runs.

* Danny M *

+1 for that.



dean clarke 207/01/2016 03:56:01
155 forum posts
330 photos

IT LIVES YESSSS!!!!!! Well it has finally breathed its first breath of life yay.......... still a bit of work required in the fine adjustments and finishing touches etc but the beast lives.....

here is the youtube link to the first run video

dean clarke 207/01/2016 04:04:48
155 forum posts
330 photos

So its a big thankyou to all of you who encouraged me and also to those few who told me it couldn't be done. Nothing fires up the determination more than being told it won't work or can't be done. While I admit there is still a lot of work to be done in the fine tuning department and no doubt a few more modifications to a few things to deliver peak performance, but there is now no doubt that you can in fact supercharge a 2 stroke engine. For those keen or mad enough to keep following my complete breakdown of all sane thinking the next project is a follow on development of the theory used in this v12 engine only slightly different. The next project is a twin blown w 24 glow 2 stroke.

Cheers for now


Peter Krogh07/01/2016 05:34:16
212 forum posts
20 photos

Wow, that's just great! I had my doubts when I first read your early posts, then as I followed the build seeing the attention you were putting into the details.....

I've seen glow engines. I've seen supercharged engines. I've seen two cycle engines. I've seen V 12s. But I've never seen, or heard about, all of those together in one engine. And a small one too boot!!

Geez that's wonderful! Congratulations Dean!!!


thaiguzzi07/01/2016 05:57:34
601 forum posts
131 photos

Buloody Hell Man! What a noise! Stupendous. Orgasmic. Brilliant.

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