supercharged V12 2 stroke

[Jeff DaymanParticipant @jeffdayman43397]

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

[Peter KroghParticipant @peterkrogh76576]

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!!

Pete

[dean clarke 2Participant @deanclarke2]

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……..

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

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

Cheers for now

Dean

[dean clarke 2Participant @deanclarke2]

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 crankcase………no 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

Dean

[Jeff DaymanParticipant @jeffdayman43397]

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 M2ZParticipant @dannym2z]

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 ColwillParticipant @davidcolwill19261]

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.

Regards.

David.

[dean clarke 2Participant @deanclarke2]

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 2Participant @deanclarke2]

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

Dean

[Peter KroghParticipant @peterkrogh76576]

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!!!

Pete

[thaiguzziParticipant @thaiguzzi]

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

[thaiguzziParticipant @thaiguzzi]

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

[Ian AbbottParticipant @ianabbott31222]

What's a "two cycle" engine?

Ian

[David ColwillParticipant @davidcolwill19261]

Well done Dean!!!

David.

[Danny M2ZParticipant @dannym2z]

Goodonya Dean – not bad for a kiwi.

* Danny M * (from the western island)

[doubletopParticipant @doubletop]

Dean

Jeez that's fantastic!!

It the control line ME109 going to happen? You are going to need to eat plenty of spinach to keep that under control!

or is it a case of moving on to the W24?

Pete

[Michael GilliganParticipant @michaelgilligan61133]

Posted by dean clarke 2 on 07/12/2013 04:12:58:

here is the first stage of the block.

[Ady1Participant @ady1]

Well done Dean, great to see her running

[V8EngParticipant @v8eng]

Wow, that is amazing!

Well done Dean, great to see and hear it running.

Edited By V8Eng on 07/01/2016 14:39:05

[dean clarke 2Participant @deanclarke2]

Thanks for the good comments guys, really appreciate it. It's been a bit of a long haul but we got there in the end. I do have a smallish problem still though…….wondering if any of you guys have anything to offer on the starter front. I am finding that even though i am using a "heavy duty" model engine starter it simply doesn't have the grunt needed to turn the engine over fast enough. What I need really is one of those gokart starters and was looking for any info on buying or building one.

cheers

Dean

 

PS. although the engine is running it is by no means completed. blower drive needs to be finalised and  I think the carbs are a little bit agricultural and will be updated soon. also there is a bit of finishing details still to be done.

Edited By dean clarke 2 on 07/01/2016 22:46:46

Edited By dean clarke 2 on 07/01/2016 22:47:27

[Nick_GParticipant @nick_g]

.

Could you not adapt a motorbike engine starter. Ebay must be awash with them.

Nick

[WindyParticipant @windy30762]

Posted by dean clarke 2 on 07/01/2016 04:04:48:

Nothing fires up the determination more than being told it won't work or can't be done. .

Cheers for now

Dean

I've been there and when you succeed the feeling you get is fantastic to quote again my deceased friend she was told by her Mother there's no such word as can't join the try club.

A grand piece of engineering and well done.

Paul

[dean clarke 2Participant @deanclarke2]

here is the second test run after dismantling the blower to see why it wasn't pumping again, vanes gumed up with the castor oil, cleaned and reassembled

sorry about the rear end view I forgot the camera was there! LOL

Cheers

Dean

PS I have a toothed belt system to fit once the final drive speed has been decided.

[Neil LickfoldParticipant @neillickfold44316]

Dean, can I call by and see it the engine ?

Just send me a PM if you want.

Neil Lickfold

[Russ BParticipant @russb]

Nick G beat me to it!

My CBR 1100XX (inline 4, well balanced/counter balanced) is a big bike but it doesn't have a big starter and is noticeably steady on turn over. Perhaps this is due to its limited current from the small battery, I don't know.

I wonder if something from a big twin or single might have more grunt (- something without decompression mechanisms maybe??)

It sounds a bit like a "suck it and see" job

Edited By Russ B on 08/01/2016 07:19:24

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