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What are the differences in the Carrera vs 930 heat ducting (1984-89)??

1) I am guessing that the heat exchangers on the 1984-89 3.2L engine are different from the 930 HEs -- based on the used parts ads that stipulate that they are either 930 or 911/3.2 HEs. However, I'm not sure.
Are the two models' HEs different??

2) Which comes to my real question: what does the heat ducting system for a 930 look like (the part that takes the heat from the HEs)?

I'll be installing a turbo in my 87 3.2L, and I want heat. I will be using a stock 930 turbo setup ( stock 3.2 HEs, turbo, IC, J-pipe, and Fabspeed 1-in-2-out), and I can see that the turbo, turbo piping, and intercooler will conflict with the heater blower and ducting in the engine compartment.

I can't find any blow up diagrams or illustrations in our host's catalog.

Can anyone point me in the direction to find a blow up diagram of what heat looks like in a 930?

thanks.

Old 05-08-2013, 09:29 AM
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Crotchety Old Bastard
 
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You will need to back-date the heater ducts. 930 uses the same setup as early 911 where Carrera uses 2 into 1 split.
Yes the J-pipe will bolt up to the Carrera exchangers.
Now about that muffler choice ...
Old 05-08-2013, 09:56 AM
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RL8,
Thanks.
"Back dating the heat" - I've seen that mentioned in other posts over the years, but paid no attention to the details.

There's a Pelican Tech sheet on "Early Heat Exchanger Retrofit" at Pelican Technical Article: 911 Heat Exchanger Retrofit

But I don't have to change HE's, right?

I did a quick search of "back dating, heat, and back date" -- no details regarding what is involved in any of the threads that I checked.

I did find a diagram of a 930 HE and ducting on Pelican (see attached).

Any other sources?
thanks.

PS - regarding the muffler... it came with the turbo kit from another Pelicaner. BUT, while we're on the subject, I'm sure you have some factory rejects laying around your shop -- and I'm not needing perfection where it's not visible, so if you want to give some major discounts for these...??
Old 05-08-2013, 02:09 PM
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Crotchety Old Bastard
 
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Join Date: Jan 2000
Location: Huntsville, AL
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No you do not need new heat exchangers.
Here is a picture of my '78 Euro system with heat tubes attached:





Your Carrera engine will be missing the heater tin at the fan shroud that matches up to these tubes. A short length of aluminum hose attaches the heater shroud ducts to the heat exchanger tubing. You can substitute SCAT tubing as we did in this header installation. You can see the factory length ducting going through the engine tin:





__________________
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 05-08-2013, 06:28 PM
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Quote:
Originally Posted by RarlyL8 View Post
No you do not need new heat exchangers.
Here is a picture of my '78 Euro system with heat tubes attached:
[pic]
Your Carrera engine will be missing the heater tin at the fan shroud that matches up to these tubes. A short length of aluminum hose attaches the heater shroud ducts to the heat exchanger tubing. You can substitute SCAT tubing as we did in this header installation. You can see the factory length ducting going through the engine tin:
Brian,
Thank you very much for the info and pics. That really also helps me figure out how the turbo ducting fits in relation to the heater ducting.

Next 3 questions:
1) Where/how is the blower then mounted? (I guess I need a topside view -- dang, I really just need an all-models manual, huh.)

2) So I do need the two scoops from earlier models that fit on top of the engine by the fan assembly? I guess that's what you were referring to by "...the heater tin at the fan shroud that matches up to these tubes..."?

3) Would 3" aluminum flexible ducting be better than the silicone heater ducting (not the foil stuff, but the more solid stretchable and bendable aluminum)(available in places like HomeDepot -- see below picture). It's 10X less expensive, is flexible, but more rigid, and more immune to heat -- or are there other factors? There must be some other reason, because Pelicaners tend to think along the lines of improv.

Thanks once again for letting me tap your expertise.

Old 05-09-2013, 06:12 AM
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I'm starting a thread which is better titled : Backdating heat for 1987 911 with Turbo.

I roamed thru Pelican's site and found some of the great stuff that is stored there -- and found a section called Diagrams.

Question I now have is, to which year and model am I trying to backdate?

Old 05-09-2013, 09:07 AM
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