Author Topic: 917 180 degree V 12  (Read 85018 times)

Offline Admiral_dk

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Re: 917 180 degree V 12
« Reply #345 on: September 23, 2020, 12:27:36 PM »
Hi Dave

Thank you for your reply. I should have mentioned that I have Schillings Book, so I know how it's assembled - but great drawing to show all who hasn't seen it.
I hadn't thought of a pot chuck, but it makes very good sense as a 'fixture' that ensures parallelnes. It still doesn't explain the holes that you must 'drill' - will that then be a job for the Rotary Table and the mill, in order to be excatly 120 degrees apart and perfect 90 degrees to the disks ...?

Great CAD work  :ThumbsUp:  and even better news about Ava  :cheers:

Best wishes

Per

Online Vixen

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Re: 917 180 degree V 12
« Reply #346 on: September 23, 2020, 01:03:54 PM »
Hi Dave

 I should have mentioned that I have Schillings Book,

Best wishes

Per

Per,

You are lucky. I've been trying to obtain a copy of that book for years. It's out of print and I have not been able to find a used copy or even find a download.

Mike
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Sometimes, it can be a long and winding road

Offline Admiral_dk

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Re: 917 180 degree V 12
« Reply #347 on: September 23, 2020, 07:36:34 PM »
Mike - I bought it second hand in German 10-15 years ago on eBay.de - a good read with great examples.

Online Vixen

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Re: 917 180 degree V 12
« Reply #348 on: September 23, 2020, 08:03:54 PM »
Per,

A very kind and helpful person sent me a PDF copy. It will be a slow read, I wish I had paid more attention during my German language lessons way back when I was at school. The the drawings need less translation and as you say many great examples.

Mike
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Sometimes, it can be a long and winding road

Offline JonC

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Re: 917 180 degree V 12
« Reply #349 on: September 24, 2020, 12:46:53 PM »
Dave,

I notice that your crank drawing shows the needle rollers for the big end bearing are a pretty snug fit on the width. Did you alter the cylinder stagger to match this or just get lucky with the bearings that were available?

Jon
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Online steamer

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Re: 917 180 degree V 12
« Reply #350 on: September 24, 2020, 01:16:10 PM »
I just got lucky on spacing    im not convinced on the needle roller con rod bearing yet either.   
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Offline AlexS

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Re: 917 180 degree V 12
« Reply #351 on: September 24, 2020, 06:55:13 PM »
Thanks for the explaining and Cad views Dave!

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Re: 917 180 degree V 12
« Reply #352 on: October 06, 2020, 07:00:43 PM »
Much going on with the 917...

Going to set up and run with methanol. or even E85  Easier all around

Wanted to go with 1/4 -32 plugs so I could also do glow plug...but really there just isnt room for them...In their place I am working the 10-40 plug solution.

It's crowded in there......

See below.

Valves are to scale.... 7/16 intake, and 3/8 exhaust on a 0.846 bore........they are manhole cover size!!!!!!...Im going to reduce them a bit, to improve response of the engine

Ignition systems
Spoke with Roy Sholl at CNC engines and I'll be purchasing 2 of his magnum CDI kits    I'll set this up as two 6 cylinder engines using both distributors....

Roy and I had a great conversation and I learned a lot!!!   

For instance, he recommends running the hall switch off the crank if possible, and it keeps it away from the high voltage.    Plenty of opportunity for me to do that so I'll probably go that way with 3 magnets and 2 hall switches....

Dave
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Online Roger B

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Re: 917 180 degree V 12
« Reply #353 on: October 06, 2020, 07:58:31 PM »
Unless you are planning to run at a scale Le Mans I suggest that you reduce the valves to around 60-70% of the original size. The bigger the plug you can get in the better the reliability.
Best regards

Roger

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Re: 917 180 degree V 12
« Reply #354 on: October 06, 2020, 08:15:54 PM »
Echo, echo

Mike
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Re: 917 180 degree V 12
« Reply #355 on: October 06, 2020, 08:59:43 PM »
8mm valves

10-40 plugs

Dave
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Online Vixen

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Re: 917 180 degree V 12
« Reply #356 on: October 06, 2020, 09:08:56 PM »
Getting better, now you need to find room for a bigger 1/4 x 32 plug, you only need one to run the engine.

Mike
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Sometimes, it can be a long and winding road

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Re: 917 180 degree V 12
« Reply #357 on: October 06, 2020, 10:10:31 PM »
......MAYBE.....


open wide........
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Re: 917 180 degree V 12
« Reply #358 on: October 12, 2020, 02:11:05 AM »
Some progress today....1/4 plugs are in, I have a pair of distributor gears in as well as the hardware to mount the cam boxes. 

Looking for some smaller helical gears....looking for a source.    These are from PIC Design

64 DP   20 and 40 tooth

 A 15 and a 30 would be great!

Dave
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Online crueby

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Re: 917 180 degree V 12
« Reply #359 on: October 12, 2020, 03:40:48 AM »
Holey swarf, this an intricate design!  What size are you planning to build it at?  Wow.

 

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