Author Topic: 1/4 scale Porsche 917 180 degree V12 Build  (Read 57507 times)

Offline jcge

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Re: 1/4 scale Porsche 917 180 degree V12 Build
« Reply #615 on: April 01, 2023, 11:28:50 PM »
Great work on such a tiny assembly !

Offline steamer

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Re: 1/4 scale Porsche 917 180 degree V12 Build
« Reply #616 on: April 02, 2023, 12:55:52 AM »
Not particularly happy with the cutter I made....I'll remake it tomorrow.....but making progress...

Vixen's experimental gears in the foreground....for size comparison.....   I'll get there.....but I'm bushed right now....

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

Offline steamer

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Re: 1/4 scale Porsche 917 180 degree V12 Build
« Reply #617 on: April 02, 2023, 09:17:32 PM »
Key way cutting attachment set in the lathe to finish the keyway in the pump gears.  I ground up a better HSS single edge cutter to cut the keyway, and I've mounted it in a 1/2" shank holder and I'm waiting for the loctite to kick off.
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline steamer

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Re: 1/4 scale Porsche 917 180 degree V12 Build
« Reply #618 on: April 15, 2023, 12:54:35 PM »
3D printed the engine.blocks yesterday and gave it a whirl   worked nice!

<a href="https://www.youtube.com/watch?v=I965XWwQRZw" target="_blank">http://www.youtube.com/watch?v=I965XWwQRZw</a>


https://www.facebook.com/100008022455617/posts/pfbid09kCQYLxiFbcHdhNhJwnstxmB4r3JspfG4iXYcti4vZxYdvfub7Exw8qfWTSsZYrTl/?app=fbl\
« Last Edit: April 15, 2023, 01:41:10 PM by steamer »
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline steamer

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Re: 1/4 scale Porsche 917 180 degree V12 Build
« Reply #619 on: April 15, 2023, 01:19:14 PM »
Next step now that the dbit grinder work head is done is to get the grinder running and make a keyway broaching tool that is accurate........fixing a tool to mKe a tool...

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

Offline crueby

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Re: 1/4 scale Porsche 917 180 degree V12 Build
« Reply #620 on: April 15, 2023, 02:06:04 PM »
Is the printed block just a test piece or is it going to be used for casting from?

Offline steamer

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Re: 1/4 scale Porsche 917 180 degree V12 Build
« Reply #621 on: April 15, 2023, 03:00:22 PM »
Just a fit check, and a bit of inspiration for next steps

I will hopefully get the pump done shortly.....from there the "throttle" on the 917 project will probably lift a bit to take advantage of the next 4 months of decent weather and get my boat back in the water.....    During that time, I'll be in the shop on the wet weekends and evenings if I'm not trying to get Rushforth back in.   

One of the key tests I need to complete though is to confirm the pump performance up to 4000 rpm or half engine speed ( expected anyway)  this will confirm the pump drive gear ratio, and that will help finalize the block halves.     The material for the blocks is in the shop  ( 6061-T6)  and they will be machined from billet and then line bored on the lathe.

The finishing of the grinder workhead was the first line boring job I've done on the SouthBend since I rebuilt her.   It proved that she bores DEAD straight....like I'm incapable of measuring any variation in the 1.25" bore over nearly 3 inches...so less than 0.0002" taper ....as I can't measure a bore anymore accurate than that.....so that was a good validation for the engine block work that is coming

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

Offline Kim

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Re: 1/4 scale Porsche 917 180 degree V12 Build
« Reply #622 on: April 15, 2023, 05:35:20 PM »
That's pretty cool, Dave!  Nice to see all your work fitting together, even if only for demonstration purposes!  :popcorn:

That will be fun to see your boat back in the water with its new engine.  Make sure and let us know how it goes.

Kim

Offline steamer

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Re: 1/4 scale Porsche 917 180 degree V12 Build
« Reply #623 on: April 15, 2023, 06:05:03 PM »
That's pretty cool, Dave!  Nice to see all your work fitting together, even if only for demonstration purposes!  :popcorn:

That will be fun to see your boat back in the water with its new engine.  Make sure and let us know how it goes.

Kim
Thanks Kim,   the boat hasn't been used much in the last 7 years after my daughters first diagnosis.     The engine conversion started just before the second diagnosis and right before the pandemic...so it will be nice to get the boat back into use again!

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

Offline steamer

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Re: 1/4 scale Porsche 917 180 degree V12 Build
« Reply #624 on: April 29, 2023, 09:21:31 PM »
OK   fix a tool to make a tool to go in another shop made tool to cut a little keyway...........yup....

Fix the 265 grinder to make a .05" keyway broach, to go in my lathe mounted keyseat cutter

The grinder did a nice job!   Super easy to grind that....that would be really hard to do by hand....the shank of the tool is 0.125"

I'm setting back up to finish the keyways in the driven oil pump gears.

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

Offline Kim

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Re: 1/4 scale Porsche 917 180 degree V12 Build
« Reply #625 on: April 30, 2023, 01:18:51 AM »
Looks like your rebuilt 265 did a nice job grinding that tool!  :popcorn: :ThumbsUp:

Looking forward to seeing it make the keyways now!

Kim

Offline steamer

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Re: 1/4 scale Porsche 917 180 degree V12 Build
« Reply #626 on: April 30, 2023, 05:34:31 PM »
Cutting the keyways in two gears
Bore is 1/8"

https://youtube.com/shorts/amzrIlNX7nc?feature=share


« Last Edit: April 30, 2023, 06:09:42 PM by steamer »
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

Offline Kim

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Re: 1/4 scale Porsche 917 180 degree V12 Build
« Reply #627 on: April 30, 2023, 07:01:52 PM »
That's great, Dave! Love seeing your keyway cutter in action!  :ThumbsUp: :popcorn:

Kim

Just as an aside - if you don't want your video to come out as a Youtube Short, try recording it in landscape mode rather than portrait mode.  I found that makes it less likely to be a short.

I also have learned that if you use some other recording device than a phone it won't come out to be a short.  But phones are what we all have that do videos.  Luckily, my camera also happens to have a video mode and those videos never get converted to shorts!  Just my experience.  And personally, I don't like the shorts because you can't embed them in the forum posts.  Just link to them, as you've found.  I find their stupid 'short' thing very frustrating. But I think it's just YouTube trying to compete with TicToc... go figure...  But maybe it isn't something that bothers you, which is fine too!

Offline steamer

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Re: 1/4 scale Porsche 917 180 degree V12 Build
« Reply #628 on: April 30, 2023, 07:16:14 PM »
Yeah it's a bit of a pain in the ass, but it works for what I'm trying to do ....other than the embedding part....
IThe gears are done, and next is the keys and I need to tap a few holes and I also have a cross pin slot to cut in the drivegear to the pump.     Fussy part with a lot of ops     I also need to get the cross port holes drilled.

Tonight I need to make a few parts for work....so that has me distracted at the moment......and it's about to start raining cats and dogs

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

Offline steamer

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Re: 1/4 scale Porsche 917 180 degree V12 Build
« Reply #629 on: June 09, 2023, 11:14:20 PM »
Well    I've worked 27 of the last 32 days, near 80 hour weeks....and I'm off this weekend....finally.

Unfortunately long hours wasn't working on this project!

I may get some time in the shop tomorrow, and I'll try to pick back up on the pump....and try to finish it.

Dave
« Last Edit: June 10, 2023, 12:01:56 AM by steamer »
"Mister M'Andrew, don't you think steam spoils romance at sea?"
Damned ijjit!

 

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