Porsche 917 flat 12 engine

[Foketry]

After completing the external milling and drilling of the 2 engine half-blocks , I had to bore the crankshaft seat
The motor block is 320 mm long (12,6 inch), it is not possible to do the boring with my milling machine.

I therefore made a jig for lathe , with a boring tool between spindle and tailstock

 

[Foketry]

I aligned the jig by a bar between the spindle and tailstock

 

[Foketry]

here's the boring bar while boring the seats

 

[FTX]

Very acurate job. Loock perfect.

Ftx

 

[Foketry]

roughing the seats for pump shaft and distributor shaft with ball nose end mill

 

[Foketry]

 

[Foketry]

now the 2 engine half-blocks are ready for reaming shaft seats , I extended a commercial reamer to go through the whole block

 

[Foketry]

gear assembly test

 

[michelko]

Man do you sleep some times?
Just a couple of weeks and it will run.

 

[a41capt]

Wow!

 

[dnalot]

Nice. I will be following your build.

Mark T

 

[Foketry]

Man do you sleep some times?
Just a couple of weeks and it will run.

it is the lockdown that makes me work in my shop, we are not allowed anything else but it will soon end , i hope

 

[Willyb]

Great project. Looking forward to seeing and hearing it run.
Cheers
Willy

 

[ajoeiam]

it is the lockdown that makes me work in my shop, we are not allowed anything else but it will soon end , i hope

Good luck with covid ending soon - - - - dunno where Italy is at but here we are starting the 3rd round.
My guess is that there is at least one if not a few more.

Wonder what our societies are going to look like when this is done?
(Our economies are already is real trouble and more - - - - well - - - - I' stopping there!)

 

[Foketry]

Good luck with covid ending soon - - - - dunno where Italy is at but here we are starting the 3rd round.
My guess is that there is at least one if not a few more.

Wonder what our societies are going to look like when this is done?
(Our economies are already is real trouble and more - - - - well - - - - I' stopping there!)

Next week we will be free again, restaurants, bars, cinemas, museums open until 10pm, but respecting all safety regulations, distancing, masks and limited number of people
I hope this is the last time, we are proceeding with vaccinations..

 

[Foketry]

in these days I finished the connecting rods ,12+1
material: 7075 aluminum, end mill 4 mm

 

[Foketry]

My cylinders: bore 26 mm, stroke 21.4 mm, displacement 11.35 cc, total displacement for 12 cylinders :136 cc
Material: cast iron G25
The original cylinders: Bore 86 mm (3.4 in), Stroke 70.4 mm ( 2.8 in), compression 10.5:1 , displacement 4907 cc , 299.4 cu in
Note that the stroke is much less than the bore, it is a competition engine

my drawing , the seal whit the head is guaranteed by a viton o-ring

 

[Foketry]

12 + 2 machined cylinders

 

[Foketry]

the first phase of turning, 2 cylinders joined together to save some material

 

[jack620]

I just found this thread. Very impressive work! I drove through Modena on my way to Bologna. I visited the Ducati factory which was excellent.

Enjoy your freedom next week.