Top End Rebuild and Turbo Project underway - Page 7

polizei · 02:41 PM

Quote:

Originally Posted by 911st

Again, this seems why Porsche did not put twin plugging on its 8/1 CR 993 TT motor even-though it already had twin plugging on the 964 NA motors. Same for their tt GT2 race motors I believe.

Was the plug hole offset on the 993 TT?

I know I am questioning the norm, and that in an ideal world I would be planning on installing an intercooler. The trouble is that by the time I get a turbo tail and an intercooler, that is going to be another couple thousand. Additionally, I REALLY like the idea of maintaining the complete narrow body look. If I decide to go to a boost level much higher than what I presently intend, I know that I will need an intercooler. I'm just wondering if twin plugging provides any safeguard (though perhaps not AS effective) that intercooling would.

One more question: does the 964/993 dual cap rotor get in the way of the intake piping proceeding from the turbo to the intake manifold?

911st · 06-15-2008, 10:49 AM

I do know that Andial fits dual distributors to 993TT's but do not know what is involved.

I to like the idea of a stock deck w a turbo. It seems that without the A/C condenser one can fit an inter-cooler and I have seen a couple of installs. I also though of just using a shorter condenser and putting the I/C to the right or left side. It would not be as large.

In BA's book he notes that a small I/C on a low pressure supercharged Porsche that even though it was not in the air flow reduced intake air temp from 175 to 125.

That is more power and more safety.

Keep up the good work.

raceman · 06-15-2008, 11:18 AM

great thread,you`ll have quite a road car when you`re done. l say road car because with no intercooler the track will be out of the question. lntercoolers are cheap these days,less the $500- for a universal unit that you can relocate the pathways on,after all the motor work why cook the power out of it? l find there is a huge "porsche tax" on intercoolers and l see no reason to spend the money just because the inlet/outlets are configured for a flat six. l paid less then $500- for my full bay unit (no mods were needed)runs very cool under full boost.

polizei · 07:30 AM

Quote:

Originally Posted by raceman

great thread,you`ll have quite a road car when you`re done. l say road car because with no intercooler the track will be out of the question.

My aim has been to create a turbo road car, so thank you! My many advisers believe I should be safe to run without an intercooler as long as I keep the boost low. I am trying to keep the costs down... My budget has more than doubled since my first conversation with Ben. I ultimately want to have a twin plugged and intercooled motor. I'm leaning towards twin plugging first because it seems like this would be more work with the motor back in the car, whereas adding an intercooler seems pretty straight forward.

Quote:

Originally Posted by polizei

One more question: does the 964/993 dual cap rotor get in the way of the intake piping proceeding from the turbo to the intake manifold?

bump

930gt-40r · 930gt-40r's Garage

Andy, yes the dual cap gets in the way of a stock location single turbo charge pipe. Now what some have done to correct this is make a 90 degree elbow out of the turbo, go up into the fender well and enter the engine bay through the side of the fender well. Some do not like this as it requires cutting a hole in the wall between the engine bay and the fender well, but it is effective. This is the route I am going to take when I get my junker back together with the 964 distributor.

polizei · 12:26 PM

Kris, do you think I could just augment the hole in the engine tin and bring the charge pipe up at an angle? Maybe use a 45 degree silicone bend.

911st · 06-16-2008, 01:13 PM

Look in Bruce Anderson's book at the picture of how RUF made his charge pipe for the 964's for some ideas. I think he just snaked around the distributor.

930gt-40r · 930gt-40r's Garage

It would be difficult, but I guess it is possible. I just know what a pain in the a$$ it was trying to fab up a pipe for a single turbo, 12 pin distributer (JB racing), I can only imagine how hard it would be with a twiin cap as the bottom cap stands even further into the way. However give it a shot, it could be easier with a smaller turbo. The car that I am speaking of has a PT-76 with a 3" outlet on the cold side...

polizei · 06-16-2008, 02:05 PM

I have a Precision 6162 with a 2 inch outlet. Hopefully it'll be easier.

930gt-40r · 930gt-40r's Garage

Might be possible, but its going to be tight.

strokher racing · 06-16-2008, 05:25 PM

I would agree mine looks like a snake to say the least!

930gt-40r · 930gt-40r's Garage

it looks like your piping is doing yoga

polizei · 06-16-2008, 05:42 PM

Quote:

Originally Posted by strokher racing

I would agree mine looks like a snake to say the least!

Would you mind posting a pic? If you could show one from directly above the dizzy, that'd be great.

strokher racing · 06-16-2008, 06:34 PM

If my car was here I would! You would have to ask Kris to take a pic since my car is in his garage right now lol.

polizei · 06-16-2008, 06:35 PM

I'm reading about some single cap twin plug distributors. Is there one that would work for my setup? It would be nice to have only one cap instead of 2...

strokher racing · 06-16-2008, 06:40 PM

I have the JB 12 plug in mine. It is a single cap

polizei · 06-16-2008, 06:46 PM

Quote:

Originally Posted by strokher racing

I have the JB 12 plug in mine. It is a single cap

Where can I get one and how much do they normally run?

strokher racing · 06-16-2008, 08:22 PM

http://www.jbracing.com/

Call and ask for Jim. Tell him Eric Hood sent you

polizei · 07-03-2008, 10:49 AM

I decided to pull the trigger on a 964 twin-plug distributor. Dave from Road & Race hooked me up with a rebuilt one at a decent price. For anyone that's interested, here's a list of the parts I purchased to complete the twin plugging (heads were already drilled):
1. 964/993 Dizzy with new caps/rotors
2. Andial Splitter
3. Extra Coil
4. Two coil mounts welded together
5. Special ordered set of Magnecor spark plug cables for the lower plugs (Same length as the lower plug wires for a 964 but with 911 connectors).
6. 14 gauge wire to connect splitter to coils.
7. Vent kit for 964 dizzy
8. Drilled lower valve covers (yet to be completed)

I haven't figured out how I'm going to run the 14 gauge wire from the splitter to the coils. Any suggestions? I also need to run the wire for the LM-1, so maybe I can have them travel a common path.

The cylinders & pistons are in (again). Probably won't get much done over the holiday weekend, but next week is looking VERY promising

les_garten · 07-03-2008, 12:07 PM

Quote:

Originally Posted by polizei

I decided to pull the trigger on a 964 twin-plug distributor. Dave from Road & Race hooked me up with a rebuilt one at a decent price. For anyone that's interested, here's a list of the parts I purchased to complete the twin plugging (heads were already drilled):
1. 964/993 Dizzy with new caps/rotors
2. Andial Splitter
3. Extra Coil
4. Two coil mounts welded together
5. Special ordered set of Magnecor spark plug cables for the lower plugs (Same length as the lower plug wires for a 964 but with 911 connectors).
6. 14 gauge wire to connect splitter to coils.
7. Vent kit for 964 dizzy
8. Drilled lower valve covers (yet to be completed)

I haven't figured out how I'm going to run the 14 gauge wire from the splitter to the coils. Any suggestions? I also need to run the wire for the LM-1, so maybe I can have them travel a common path.

The cylinders & pistons are in (again). Probably won't get much done over the holiday weekend, but next week is looking VERY promising

YUM! Sounds like a good time would be had by all!!