Author Topic: 917 180 degree V 12  (Read 42967 times)

Offline Vixen

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Re: 917 180 degree V 12
« Reply #195 on: June 12, 2017, 11:49:19 PM »
A scale model 917..........a dream well worth waiting for.

You will get to start soon enough

Mike
It is the journey that matters, not the destination

Offline steamer

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Re: 917 180 degree V 12
« Reply #196 on: June 13, 2017, 01:56:29 AM »
Thanks for looking in Mike!

Dave
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Offline steamer

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Re: 917 180 degree V 12
« Reply #197 on: April 08, 2018, 11:01:28 PM »
Hey Mike    what do you think about a slide valve throttle like the original?
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Offline b.lindsey

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Re: 917 180 degree V 12
« Reply #198 on: April 09, 2018, 01:02:41 AM »
Glad to see you haven't forgotten about this incredible project Dave. Hope your knee lets you gat back to the shop soon.

Bill

Offline Art K

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Re: 917 180 degree V 12
« Reply #199 on: April 09, 2018, 02:14:01 AM »
Dave,
Looking at the video it has a standard hemispherical combustion chamber, how hard can that be. :mischief:
Art
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Offline Vixen

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Re: 917 180 degree V 12
« Reply #200 on: April 09, 2018, 09:53:43 AM »
Hey Mike    what do you think about a slide valve throttle like the original?

Hi Dave,
The twelve inlet stacks with the slide valve throttle block are as iconic as the central cooling fan. They are what makes the 917 road-race engine so exciting to look at. Unfortunately the full size engine had fuel injection and our model will require carbuterrors. Making twelve carbs will be difficult. Making four carbs, each feeding three cylinders may be a little easier.




As an alternative you could consider the twin turbo CanAm engine. You could fit a single carburettor in place of the twin turbos. That would be somewhat easier to achieve.







But for me that would not have the excitement and visual appear as the Le Mans winning configuration

Design the engine first and worry about the fueling later.

Go on with it, get started. You hear!!

Mike    :zap: :zap: :zap:


It is the journey that matters, not the destination

Offline Jasonb

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Re: 917 180 degree V 12
« Reply #201 on: April 09, 2018, 10:29:05 AM »
Would there be enough height to make round slide valves rather than flat, much like you get on high end RC Car engines? A lot easier to seal and you could have one rod with the six holes in it per side.

Offline Roger B

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Re: 917 180 degree V 12
« Reply #202 on: April 09, 2018, 10:30:41 AM »
I think that fuel injection may be possible  :stir: Manifold injection requires a lot less pressure than cylinder injection.
Best regards

Roger

Offline steamer

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Re: 917 180 degree V 12
« Reply #203 on: April 09, 2018, 12:29:32 PM »
I think that fuel injection may be possible  :stir: Manifold injection requires a lot less pressure than cylinder injection.


Taking Mikes advice    get on with the design       but you're talking mechanical or electronic fuel injection?

Dave
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline steamer

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Re: 917 180 degree V 12
« Reply #204 on: April 09, 2018, 12:32:18 PM »
Would there be enough height to make round slide valves rather than flat, much like you get on high end RC Car engines? A lot easier to seal and you could have one rod with the six holes in it per side.

That's a solution worth a layout    perhaps with 4 carbs and 8 dummy stacks......
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Offline Roger B

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Re: 917 180 degree V 12
« Reply #205 on: April 09, 2018, 12:52:15 PM »
Dave, I was thinking mechanical like the original.
I've run mechanical fuel injection into the inlet port of my 25cc engine with success. Now the weather has improved I can re-open my R&D department and carry out some more trials with the helix controlled injection pump. In the video the carb is just being used as a throttle.

http://www.modelenginemaker.com/index.php/topic,4906.0.html

Best regards

Roger

Offline steamer

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Re: 917 180 degree V 12
« Reply #206 on: April 09, 2018, 01:52:30 PM »
Perhaps...though I think getting it running with  carb at least initially would be less traumatizing.... :toilet_claw:

Hmmmm   getting on with the guts first

.812 more 1 stroke
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Offline steamer

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Re: 917 180 degree V 12
« Reply #207 on: April 09, 2018, 02:08:08 PM »
The 12 inlet stacks is the look I want....
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Offline Vixen

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Re: 917 180 degree V 12
« Reply #208 on: April 09, 2018, 02:26:34 PM »
Perhaps you could get one injection pump to squirt all 12 stacks simultaneously.

But first you need to get the engine designed.

Mike :noidea:
It is the journey that matters, not the destination

Offline steamer

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Re: 917 180 degree V 12
« Reply #209 on: April 09, 2018, 02:43:47 PM »
 
Perhaps you could get one injection pump to squirt all 12 stacks simultaneously.

But first you need to get the engine designed.

Mike :noidea:


Absolutely.
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!