Author Topic: Supercharged V12 2 stroke  (Read 33502 times)

Offline 777engman

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Supercharged V12 2 stroke
« on: October 18, 2014, 04:06:56 AM »
Ok, so i guess I'll start a thread here as well for my V12 build. This project is a V12 supercharged 2stroke Glo engine, running on on methanol and castor oil with some nitro methane added.
here's  some photos of the crankcase from bar to finished engine block.

Offline 777engman

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Re: Supercharged V12 2 stroke
« Reply #1 on: October 18, 2014, 04:14:23 AM »
Here's the front housing, carb bodies, manifolds and super charger parts.
hope you enjoy looking.
dean

Offline 777engman

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Re: Supercharged V12 2 stroke
« Reply #2 on: October 18, 2014, 04:20:42 AM »
Here's the rest of the supercharger parts etc.
cheers
Dean

Offline 777engman

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Re: Supercharged V12 2 stroke
« Reply #3 on: October 18, 2014, 04:25:11 AM »
supercharger parts to date.
Dean

Online sco

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Re: Supercharged V12 2 stroke
« Reply #4 on: October 18, 2014, 06:30:11 AM »
Wow - that is some engine you are building!

Going to sound incredible when it runs,

Simon.
Ars longa, vita brevis.

Offline doubletop

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Re: Supercharged V12 2 stroke
« Reply #5 on: October 18, 2014, 10:38:48 AM »
Dean

Hi

Are you recovering OK? Are you moving over here or just duplicating your log?

Pete
?To achieve anything in this game, you must be prepared to dabble on the boundary of disaster.? - Stirling Moss

Offline Ramon Wilson

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Re: Supercharged V12 2 stroke
« Reply #6 on: October 18, 2014, 12:55:24 PM »
Superb machining Dean  :ThumbsUp: - as Simon says (oops) that's going to sound a bit special too.

As it's a two stroke though I'm intrigued as to how the fuel transfers and differentiates between relevant cylinders in the open crankcase or are they going to be segregated off as pairs? Is the process an expansion on what you have found with your other V layout engines?  - can you enlighten?

Regards - Ramon
"I ain't here for the long time but I am here for a good time"
(a very apt phrase - thanks to a well meaning MEM friend)

Offline Allen Smithee

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Re: Supercharged V12 2 stroke
« Reply #7 on: October 18, 2014, 03:12:11 PM »
I guess I'm being thick - what kind of supercharger is that?

AS
Quidquid latine dictum sit altum sonatur

Offline Admiral_dk

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Re: Supercharged V12 2 stroke
« Reply #8 on: October 18, 2014, 07:58:48 PM »
I'm guessing it's a single vane supercharger (even though I haven't seen the vane) ....

I would personally think it will run a bit uneven that way - more wanes to get a more constant pressure in the crankcase.

Why more carbs ?

Very nice looking - looking forward to see it run.
« Last Edit: October 18, 2014, 10:37:59 PM by Admiral_dk »

Offline Roger B

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Re: Supercharged V12 2 stroke
« Reply #9 on: October 18, 2014, 08:06:03 PM »
That is indeed an ambitious project  :praise2: I look forward to following it through  :popcorn:  :DrinkPint:
Best regards

Roger

Offline 777engman

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Re: Supercharged V12 2 stroke
« Reply #10 on: October 19, 2014, 01:13:22 AM »
Hi guys, here's a bit of an explanation to the questions posed.
1/ Pete I will be running both threads simultaneously.
2/ Ramon thanks for the comments. each pair of cylinders in the v configuration are sealed as a running pair with the front 2 pairs set at 180 deg to each other, then the next set of 4 are the same set up but timed at 120 to the first set of 4 with the last set  the same as the first set but timed 120 deg the other way, if you catch my drift. the cylinders are set each pair to 1 crank journal giving a total of 6 big end journals on the crankshaft. This gives you 12 firings  for every rotation of the crank.
3/ The super charger is a vane type with four vanes. the blower runs at approx a bit more than twice engine speed and delivers a constant pressure flow directly into each crankcase cavity.  The reason for the 4 carbs is that the main drawback of the vane type blower is the internal friction causing excessive heat build up. Being a two stroke engine however means i can put fuel and lube through the blower to remove the heat and friction drawbacks making it almost 100 percent efficient. They also give a much more even fuel mixture distribution to each set of cylinders so I wont have the lean/ rich mixture problems between cylinders which is common to engines with one or two carbs. you can'y see the vanes or slots  in the photos coz i haven't made the vanes yet and haven't machined the slots in the rotor yet....... got a lot sidetracked trying not to DIE!!!! LOL.
4/ Recovering slowly but surely.
cheers for now
Dean

Offline dsquire

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Re: Supercharged V12 2 stroke
« Reply #11 on: October 19, 2014, 01:39:51 AM »
Hi guys, here's a bit of an explanation to the questions posed.
1/ Pete I will be running both threads simultaneously.
2/ .
.
.
.
.
. you can'y see the vanes or slots  in the photos coz i haven't made the vanes yet and haven't machined the slots in the rotor yet....... got a lot sidetracked trying not to DIE!!!! LOL.
4/ Recovering slowly but surely.
cheers for now
Dean

That is 2 excellent reasons why we couldn't see them.  :praise2:

Please continue with your recovery, I'll be here watching.   :)

Cheers  :cheers:

Don

Good, better, best.
Never let it rest,
'til your good is better,
and your better best

Offline gadabout

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Re: Supercharged V12 2 stroke
« Reply #12 on: October 19, 2014, 06:30:44 AM »
Fantastic!
 apologies if I have missed this but what bore and stroke are we talking about?

thanks
Mark

Offline 777engman

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Re: Supercharged V12 2 stroke
« Reply #13 on: October 19, 2014, 08:46:48 AM »
Hey there, the bore and stroke is a nominal 3/4" x 3/4"  giving a nominal displacement of 70cc
Cheers
Dean

p.s. hey Ramon, how do you insert the photos into the thread like you do?

Offline Ramon Wilson

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Re: Supercharged V12 2 stroke
« Reply #14 on: October 19, 2014, 09:29:54 AM »
Hi Dean - thanks for the explanation - I think I've got it  ::) but that hurts my old brain a bit trying to get that process into format.

Thats not to infer anything negative - far be it - given what you've produced so far I have every confidence that you will come up with another outstanding engine  :ThumbsUp: - only thing is what on earth are you going to tackle after this  :o

I store all my images for posting on a Picasa account. I find it exceptionally easy to use (it has to be  :old:) The individual images are stored in respective folders. Once uploaded (from 'My Pictures' on the computer where they are saved initially) it's a simple matter of selecting the image, right click and select 'copy url' and insert into the text box via the insert image icon. I am not aware of any need to re-size - all my images are straight off the camera, into Picasa and onto the page.

Hope that helps.

I was not aware that you have had what sounds like serious health problems. Here's wishing you a good recovery and that you get back on song as quickly as possible.

Ramon

PS Just recalled that I promised you some drawings - gone right off the radar I'm afraid (that's definitely an age thing) I shall deal with this today - promise - but right now I want to get on with that second liner
"I ain't here for the long time but I am here for a good time"
(a very apt phrase - thanks to a well meaning MEM friend)

 

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