Projects on my new, to me. 1974 914-6 Options

[burton73]

This is wonderful, thank you so much for sharing WOW

Best Bob B

[jerhofer]

Now all of you can see why it is very handy having a son with this skill living only 30 miles from my house!!

[mfor1000]

On to the transmission...The first challenge was to create an adapter that goes from the 911 engine to the 012 bellhousing. So I bought some giant digital calipers and spent a bunch of time measuring. Since there will be a certain amount of error in this, I 3D printed it a couple times to get it dialed in. Then I uploaded it to send cut send and got one cut out of acrylic. Still another could of adjustments and I ordered one from them made from 1/2" 6061 aluminum. It is a little tricky because I needed to step it up past the oil cooler on the driver's side.

According to my measurements, the input shaft on the 901 transmission sticks out 10mm past the face of the bellhousing.

The 012 transmission has the input shaft recessed by 9 mm relative to that surface.

This means you have to cut 19mm plus the thickness of the adapter plate off the bellhousing of the 012 transmission. (31.7 mm).

I did this and leveled it out using a dial guage to within 0.005" relative to the input shaft by hand.

I also cut the hole for the starter and its adapter.

How did you cut the bell housing?

Will the throw out bearing "travel" work with that much cut off?

Nicely done!

I cut it using an aluminum cutoff wheel on an angle grinder. I cut it with about 3mm of extra material so I could block sand it flat relative to the input shaft using a dial indicator.

Later you'll see I had to modify the clutch fork for the throwout bearing.

[jerhofer]

(IMG:style_emoticons/default/welcome.png) Nice introduction and plan. Looking forward to watching this all come together. And you are doing this in an early 911, right? (IMG:style_emoticons/default/beerchug.gif)

It's in the blue 914.

[mfor1000]

Nice job on the harness and dbw set up - very cool. And did you do your own tuning? I'm just starting in on the wiring/set up of a Nexus R5 and PD-16 on my 914 Ferrari build and I'm looking to speak with some Haltech experts. Can you provide any contacts? Thanks and keep up the great work.

Nice to meet you! I've been watching all your Ferrari videos while I work on my car! You do some great work and I can't wait to hear that thing.

I don't really have any contacts. I just did it on my own. I've tuned a few cars in the past and the Haltech NSP software was really easy to use.

[technicalninja]

I cut it using an aluminum cutoff wheel on an angle grinder. I cut it with about 3mm of extra material so I could block sand it flat relative to the input shaft using a dial indicator.

Later you'll see I had to modify the clutch fork for the throwout bearing.

Holy Sheep Shit Batman!

You did it the HARD way!

Finished by hand none the less...

I'm betting "depth" was a MONSTER PIA to get right!

How are you verifying "center line"?

.001 off and shit dies...



I'm truly interested in what you are doing.

I'm provisioning a "High Feature" GM LGX V6 onto a Boxster/Cayman 5/6 speed.

It's the first completely new bell housing pattern for GM in nearly 50 years and no-one makes stuff for it yet.

I WAS planning on cable shifting and am going to have to take a closer look at what you have done. Might be better!

I hadn't even thought about modifying the bell housing before this thread.
Even I would have that job milled which would require a transmission tear down.

You did it RAW!

I LOVE stuff like this!

Seeing how others have solved an issue is the REASON I haunt this forum.
(IMG:style_emoticons/default/ninja.gif)

And, I'd like to know HOW you used a dial indicator to determine depth of cut across a 18" span to an accuracy of .005.

I'd use a surface plate before and after the mill job.

[mfor1000]

I cut it using an aluminum cutoff wheel on an angle grinder. I cut it with about 3mm of extra material so I could block sand it flat relative to the input shaft using a dial indicator.

Later you'll see I had to modify the clutch fork for the throwout bearing.

Holy Sheep Shit Batman!

You did it the HARD way!

Finished by hand none the less...

I'm betting "depth" was a MONSTER PIA to get right!

How are you verifying "center line"?

.001 off and shit dies...



I'm truly interested in what you are doing.

I'm provisioning a "High Feature" GM LGX V6 onto a Boxster/Cayman 5/6 speed.

It's the first completely new bell housing pattern for GM in nearly 50 years and no-one makes stuff for it yet.

I WAS planning on cable shifting and am going to have to take a closer look at what you have done. Might be better!

I hadn't even thought about modifying the bell housing before this thread.
Even I would have that job milled which would require a transmission tear down.

You did it RAW!

I LOVE stuff like this!

Seeing how others have solved an issue is the REASON I haunt this forum.
(IMG:style_emoticons/default/ninja.gif)

And, I'd like to know HOW you used a dial indicator to determine depth of cut across a 18" span to an accuracy of .005.

I'd use a surface plate before and after the mill job.

I wondered who would mention this. Good eye! This was a tough one... The input shaft didn't have any play on the transmission, so I made this fixture to clamp to it.



I clamped this on and rotated it by putting the trans in gear and rotating one of the output flanges. I was able to check both the flatness and the centering by repositioning the dial indicator. The centering was good with no modifications. I spent a whole weekend block sanding it flat. That was very difficult. I wanted to see if I could do it as a challenge. If I had to do it again, I'd take it to a machine shop and save over 24 hours of work!

[ClayPerrine]

Did you use the stock 901 clutch? It's a bit small for a high horsepower engine.

Using the bigger 240mm clutch from the Boxster/Cayman comes with multiple issues, like the fact that the 911 is a pull type clutch, and the Boxster is a push type clutch.

I like seeing how other people tackled the same issues I did. I used a Cayman S six speed and cable shifting.

You can see how I did it in my build thread: http://www.914world.com/bbs2/index.php?sho...79084&st=80

And you can check out how Rick is doing it right now for the Alien: http://www.914world.com/bbs2/index.php?sho...p;#entry3176692

Granted, it's not an air cooled six, but he tackles some of the same issues.