Help me remove Rajay turbo system from 2.7

[jpearson]

Porchcar guy - the post was that I will sell the turbo. Sorry for the confusion. I openly admit that I lack basic knowledge but I'm doing my best to learn.

[ClickClickBoom]

JP,
The 1975 is less desirable, but still a 911. I have that very year, the price was reasonable and well, it drives like a PCar. The 2.7 is notoriously finicky, CIS is everywhere, Craiglist will be your friend, or find a 2.7 guy who is going to carbs, might be cheap. If you are diving into the car to this level, get the factory shop manuals, gonna run about 600.00 on eBay, if you can get a set cheaper, buy them ASAP. The car is not very complex, but requires the right orders and sequences for R&R, it rewards proper processes with satisfying success and thwarts improper process with blindingly expensive lessons. I am an aircraft mechanic and fabricator and wouldn't touch the car without my manuals. Given that a Porsche shop probably charges in excess of $100.00 per hour, the manuals are a cheap investment, read them often and reread them, they seem to be translated from the fatherlands lingo, so a little study goes a long way. Enjoy the process, I haven't regretted my Mid-Year purchase for a minute.
eric

[jpearson]

Thanks - I've got the manuals. Need to use them more.

[911pcars]

Don't go down that slippery slope unless you get a handle on what you have and where you want to go with this. There's a current lengthy engine thread where the owner has been too optimistic on an unknown entity and purchased parts before fully understanding what he's starting with.

Sherwood

[Racerbvd]

Originally Posted by RatBox

I'm curious what model Rayjay Bob (BAE) used on the 911 set-ups. Can you post the numbers on the ID plate.

thx

Here is a picture of mine..




jpearson ,Listen to Sherwood, don't rip it apart yet, cause it might be easier/ cheaper to just enjoy that engine, as is & replace it with a 3.0 or 3.2 when needed..
if it Ain't broke, don't fix it & most old 911s mark their territory

[jpearson]

Thanks for the great info. I will finish sorting out the CIS and once it's back on the car I will look at doing a compression test. Do I need to have a muffler back on the car to do the test? I assume not but I'd like to hear from the experts.

[Packet82]

Originally Posted by Porchcar guy

I'm confused, in post #2 you said you would probably sell it and one day later, you said you wanted to enjoy it long term...Which is it ? Not to be a naysayer but I hope you realize what you are trying to attempt. Your question about the blue cylinder...COIL... shows a lack of knowledge about engines...Anyone into cars for any length of time , knows what a coil is, the shape and function. CDI is a capacitive discharge ignition control box...Good Luck...this project is not for the feint of heart !!

I'm pretty sure he was talking about selling the turbo kit he takes off the car, not selling the car itself.

[tobluforu]

Can I ask, but what did it drive like with the turbo.

[McLovin]

Originally Posted by Targalid

Usually turbo cars have lower compression pistons installed. Check the compression for clues about this. One of the other experts may have a simple way to tell what compression ratio you have.

I don't think you need to check.

Anyone who installs a turbo on a car, using mostly parts from the Ace Hardware plumbing aisle, is not going to have bothered to take the entire engine apart to install lower compression pistons. You can bet on that.

[JohnJL]

I have two complete CIS systems and a complete, non-leaking 2.7 motor if you decide you want to replace either or both.

[GaryR]

Originally Posted by McLovin

I don't think you need to check.

Anyone who installs a turbo on a car, using mostly parts from the Ace Hardware plumbing aisle, is not going to have bothered to take the entire engine apart to install lower compression pistons. You can bet on that.

Yep, move on, nothing to check for....

[tobluforu]

Originally Posted by McLovin

I don't think you need to check.

Anyone who installs a turbo on a car, using mostly parts from the Ace Hardware plumbing aisle, is not going to have bothered to take the entire engine apart to install lower compression pistons. You can bet on that.

So true as it looks like crap, but it also looks like it has been on there a while, so I wonder how well it ran since it never blew?

[gordner]

My understanding is mid year CIS cars are low enough compression that it would be unlikely anyone reduced that compression to satisfy the turbo requirements. People beat up on 2.7's but unless something wrong with it they are a good powerplant. Yes the rebuild costs are hight with case work etc. but if he can manage to run a few years as is he is already winning.
I will have a complete 76 2.7 CIS system coming available in a month or two when I switch to carbs let me know if you are interested in any of it.
Good luck to you, don't let the neighsayers get you down, every one had to learn the function of a coil at one point!

[RetroSC]

I'll throw in my 2cents, which you're more than welcome to ignore.

To me it appears you're opening a BIG can of worms here and are just going to end up with a non running mess. Based on what I can tell of your mechanical ability you should spend your time and effort cleaning up that Turbo install, fix the oil leaks, tie up and wrap wires, etc.. You'll end up with a unique 911 that has a legitimate Turbo, pretty cool if you ask me, and might be worth more than a stock 2.7 if it looks nice and tidy. Probably pretty fun to drive too.

Either way, good luck, I do hope it works out for you.

Bill

[j911brick]

Pretty kewl piece of Porsche "period" history I think. I would think that as weak as the 2.7 case is though, that turbo probably wrecked havoc on the head studs. let me know if you want to sell.

[911pcars]

My cousin Richard (RIP) was contemplating a retail turbo kit a few years ago. He installed it in his test mules; 3.0 and 3.2 for awhile.

I can say from observation and first hand confessions, with even modest boost and a stock engine, life expectancy isn't good. He played with 5 and 8psi boost pressures. His first engine ran like a bat out of hell until the excessive pressure and heat gradually shortened piston ring life.

RFNG'S Turbo Kit

Sherwood

[afterburn 549]

I think you should take it off and just give it to me...LOL
DAM ! make it work !

[jpearson]

Well after a little hiatus I am back for more help/abuse. The shed I was going to spend two weeks building took about two months (see pics) and ended up including a bunch of landscaping and fence moving. Once I got the garage emptied into the shed I installed a natural gas heater and a large compressor. It's funny how these projects quickly spin out of control.

The status of the engine is that the all of the turbo components except for the Turbo Master Control box have been removed. I am slowly piecing the CIS back together. I have included a pic of the current engine compartment.

What I need help with is removing the wiring for the Turbo Master control. The last picture shows the wiring laid out. I will try to explain the pic.

The red, yellow, and white wires coming from outside the car are the wires from the turbo control (the part to be removed). There is a bundle of wires coming from the MSD system. This bundle includes orange and black wires that go to the coil. The 3rd wire from the MSD is a white wire that is connected to the yellow wire coming from the turbo control. The 4th and final wire from the MSD is red that is connected to a red wire from the turbo control and a red wire that I assume is power for the system.

There red wire that I assumed was part of the power supply is accompanied by a blue wire that I assume is the other half of the circuit. The blue wire is connected to a white wire to the distributor and a white wire to the turbo.

I have learned a ton so far but I am clearly still a novice with a lot to learn. What I am hoping for is some specific advice on how to rewire this system. Thanks in advance.

[jpearson]

Anyone? I would appreciate the help. I found the MSD wiring diagrams on their website but I am still not sure what to do with the white wire coming from the MSD unit, it appears that it should connect with the distributor via the other white wire, but I'm not confident. I am still not sure what the blue wire is.
I have some service manuals that I bought in PDF format but much of the wiring info is not legible and that is compounded by my lack of experience reading circuit diagrams. I'd love any general education you can give about this system.
Thanks

[afterburn 549]

I am confused as per usual...what are you asking for?