Scott, I have a similar quandary, I can't decide what crossover line to use, a factory hardline or a piece of flexible line. How much clearance was there between the scavenge fitting and the exhaust tubes on the side of the case? What fitting did you use there, a 30mm 90degree?

Any additional info would be much appreciated.

John-
The fitting at the sump is the 90 degree, 30mm one seen in the photo a couple of posts up. I have stock heat exchangers. The hose just clears between the heat exchanger (near the heater outlet) and the gearbox. I had to re-tighten the fitting a number of times before the hose ended up traveling at just the right angle. Other than that, I did not encounter any clearance problems. By exhaust tubes, do you mean those coming from the exhaust ports?

Scott, thank you for the reply.

I am wondering whether the port heat exchanger will have to come off to change the case fitting and whether a 90 degree fitting will work. But if your M30 one worked OK, that gives me confidence that there is enough room to get the hose in there.

The factory crossover line is so convoluted I was wondering whether a 90 degree could be made to fit.

Did you remove the heat exchanger to fit everything?

http://forums.pelicanparts.com/uploa...1201531066.jpg

Thanks in advance, I am probably going to go through the kick panel beneath the seat with a bulkhead fitting to get the lines into the cockpit. That makes more sense than going over with the crossover pipe and then up through the fender well and into the engine compartment and then forward.

John-
I did have the heat exchanger off. You can't get a wrench on the fitting with the heat exchanger in place. Just to be clear, my line does not go back into the engine compartment. It goes into the wheel well to the late type thermostat.

By the way, in a similar thread on the S Registry board (not started by me) two people claimed to have used the hard crossover line with the 911 gearbox. This still confuses me, as there is no way the one I have (shaped like a ?) would fit.

Scott, that is very helpful, thanks. I have the "early" hardline from '71 installed, nice to know that the later (74+) one with the 30mm fitting won't fit BEFORE I bought one to go that route.

Hmm, I think I better start soaking the heat exchanger hardware in PB blaster now . . .:)

Well, I ordered a 74- hardline, I am going to see if I can make it fit. I have the 71 style hardline on there now, so I wonder where the interference is? Grady said the early cars with a 911 gearbox can ONLY use the soft line, so I'm wondering whether my box has been modified or the line bent to fit? I guess I'll find out when I'm under the car covered in oil.

John-
The conflict is with the boss that retains the end of the clutch cable. I'll be interested to hear if you have an issue when the new crossover line shows up. Note that the '70 line for cars without front coolers went up over the gearbox, just as my custom line does.

Hmm, I'm looking for a photo of that exact area, this is the only one I can find.

http://forums.pelicanparts.com/uploa...1202411547.jpg

Here's my current 71-style hardline.

http://forums.pelicanparts.com/uploa...1202411915.jpg

http://forums.pelicanparts.com/uploa...1202412234.jpg

http://forums.pelicanparts.com/uploa...1202412663.jpg

A photo from the FWM (thanks Grady, (c) Porsche)

Yep, the thing you labeled as "Boss?", hidden by the heat exchanger.

Hmm, I wonder why my current hardline doesn't hit that? I can't wait to get under and find out. Maybe it's the diameter? But the difference in radius of the line is only like 1mm.

The world according to PET- everything you wanted to know about scavenge crossover lines until 1974 (the world, for all practical purposes, ends then)

64-71: soft rubber line 901 107 331 12 EXCEPT sportomatic, which used a hardline to flex hose combo 901 107 720 01 (same hose in 1973 sporto)

72: hardline to long flex hose 911 107 720 11 to oil filter console (Sportomatic had this same hose)

73: hardline to flex hose 911 720 724 10 to thermostat on oil tank with upward pointing fitting EXCEPT 911t, which used a conventional hardline to flex hose to the tank 911 107 722 00

74- Hardline to flex hose to 30mm fitting near oil cooler 911 107 739 10

So the hose I have is either the sporto or the 911t.

Guys,

I think the issue here is the clearance between the end of the clutch cable and the oil pipe if under the bell housing. Porsche chose to solve the problem with the oil hose going above the transmission.

Below are images of the ’70-’71 transmission with the end-of-cable support. I think there are two issues; first is the clearance between the end of the clutch cable and the oil pipe. Any contact can possibly puncture the pipe. Second is the ability to service the clutch cable. With the oil pipe in such close proximity, you can’t change the cable (and the clip to the transmission 'ear').

I think the solution that Scott did is the best. I’m afraid that the under bell housing pipe will eventually have problems with contact with the end of the clutch cable. John, you need to look and see if the pipe is contacting the cable end.

Here are some images. First is one posted above with arrows showing the oil pipe and hidden ear.

The next two are a type 911 transmission with a '73.5 case and oil pipe. Note the lack of clearance between the pipe and transmission 'ear'. Remember, the end of the clutch cable extends several mm forward toward the pipe. That 'ear' is peculiar to only '70-'71 911 transmission castings. If broken, it can be replaced with a custom steel part.

Best,
Grady

http://forums.pelicanparts.com/uploa...1202499281.jpg

I have the other images on my laptop. I'll have to post them sepertly.
G.

OK, look what came in the mail today. . .

http://forums.pelicanparts.com/uploa...1202564131.jpg

This is all aeroquip startlite, -16AN, the silver sheath is an insulator. Seven hoses of about 90" each should do the trick.

Most NASCAR teams aren't using long hoses anymore, they are using hardlines with short flex hoses (hello Porsche, circa 1967). Also, all the pro teams with the exception of one use ICORE hose-- it's lighter, has a tighter bend radius, and is $45.00 per FOOT. The one remaining team uses Goodridge, but only because Goodridge supplies it gratis.

Note the crimped-on fittings. All the pro teams use crimped fittings, more positive and lighter weight. Rather than reusing the hose ends after a season the whole hose is surplused (which is why these are in my living room).

Interesting that those are almost the perfect length for an "up and over" line. Do they have 90 degree fittings on both ends?

Scott, they are mostly straight fittings. I sent one to Chuck to have him put a 30mm fitting on one end. I decided that under the car, jamming to get this completed along with a dozen other projects before race season begins, was not the time for experimentation with the factory lines.

Scott, did you clamp the line to the transmission at the top like the old factory flex hose? Or did you just lay it on top?

John-
I used a rubber coated clamp, just like the factory except larger in diameter. I used the stock L bracket to attach the clamp to the gearbox per original configuration.

Grady,

Chuck now has the crossover pipe for this application. I am wondering if the trans needs to come down ti fit this, or just the heat exchanger?