Porsche 917 flat 12 engine

[CFLBob]

I also had the same problem with Chrome and also with Microsoft Edge, it would be interesting to log in, but there seems to be a problem, a security and invalid certificates

I've ignored those warnings in the past and never had an issue with it, but I'm being a bit more cautious when I keep reading about big name companies being compromised all the time. If everyone else is going there and it's not an issue, it's probably OK. The fact that you're seeing the same warnings with Edge and Chrome (both of which are on this machine but that I rarely use), but Trevor doesn't get the warning is odd.

 

[Foketry]

Cover camshaft, from design to finished cover via SLA resin 3D printer
I split the cover into 2 parts to use my printer (200x140x200 mm )

Phase of curing with infrared rays to polymerize and harden the pieces after printing

matt black paint

logo painting with rubber roller

 

[Foketry]

Transmission from crankshaft to fan and distributors
Through a series of spur gears, bevel gears and 45 degree gears, a gear in the center of the crankshaft rotates fan and 2 distributors with different ratios.

 

[Foketry]

I designed and 3D printed the fan flange mold , made the aluminum casting and machined

 

[Foketry]

Looked for correct position of the hole for 2 distributors gear, a long time was required to align the engine block to the axis of milling spindle
The 2 gears must have as little backlash as possible

 

[Foketry]

The assembled transmission

 

[michelko]

looking realy nice. is the ventilator scale? it looks a little big in relation to the block.

Michael

 

[johnmcc69]

Amazing work! Bravo!
I really like how those covers turned out!

John

 

[Foketry]

looking realy nice. is the ventilator scale? it looks a little big in relation to the block.

Michael

Hi Michael
maybe my fan is slightly bigger but it fits inside the intake cones as shown in the photo of real engine
my photo, being taken closely, makes the fan bigger, but it is inside the cones

 

[michelko]

Jules,
how long do ou estimate for completing the build?
I realy like to hear and see it running.

Michael

 

[michelko]

by the way now that the summer is gone i will go on working on the Holt.

 

[Foketry]

Jules,
how long do ou estimate for completing the build?
I realy like to hear and see it running.

Michael

Hopefully, I hope to hear the first pops within the year.
After first pops I would like to try to build a mechanical injection system but the insuperable problem is the diameter of the injector holes which, according to my calculations for a piston of 26 mm it must be max 0.06 mm.

 

[Foketry]

by the way now that the summer is gone i will go on working on the Holt.

Holt 75, good memories, the first pops of mine

 

[Alec Ryals]

Beautiful Work !!! did You cut the gears

 

[Basil]

Hi Michael
maybe my fan is slightly bigger but it fits inside the intake cones as shown in the photo of real engine
my photo, being taken closely, makes the fan bigger, but it is inside the cones


View attachment 129957

Nice! Looks like a slide throttle plate.

 

[michelko]

Holt 75, good memories, the first pops of mine

Wow that slow running is awesome. you can nearly count each single ignition.

 

[Thommo]

Hi Foketry. Do you have the holt video in another format? I can’t open this one unfortunately.

 

[Foketry]

Hi Foketry. Do you have the holt video in another format? I can’t open this one unfortunately.

Hi Thommo
I also have Iphone format (.MOV ), but it is too big , it is not possible to share it in this forum, which format would you like?

 

[Foketry]

Distributors
This engine has 2 distributors, each for all 12 cylinders, there are 2 spark plugs per cylinder
I built 2 distributors, one for 6 cylinders on the right, the other for 6 cylinders on the left, in my heads there is no space for 2 spark plugs 1 / 4-32 each cylinder , I also made cost savings.
Instead of making 2 tabs and 2 screws to hold the distributor cap in place I put an Oring, this allows the timing by rotating the cap
The magnets and the Hall sensor will be positioned directly on the crankshaft , any backlash on the gears does not affect the timing.
The central electrode is obtained from an electric motor brush by turning

 

[Foketry]