What is involved in Heater Back dating...?!!

[PeterCarrera84]

If I install SSI's , I also would like to get the heater to work, what is involved in hooking them up? Can I use the same heater hoses I have now on my 84 Carrera ? Please explain this as if you where talking to a 5 year old ! thanks in advance for your help.

Peter

[arcsine]

"Heater backdate" implies the removal of the engine compartment heater blower and lots of extra ducting. In doing so it removes a bunch of stuff from the engine bay and therefore better access to the engine. If you are just installing the SSI HE's and leaving the engine compartment blower in place, you need nothing as your existing hoses should work. If you are going to do a heater backdate, read this thread.

[Jadams1]

These parts get removed.



And it looks like this after

[VA911]

sorry to butt in on this thread but i actually just went out this arvo and bought the dizy side bit today and plan on finding the other side soon.. i hope i bought the right one.. is this one right?





cheers guys

[syncroid]

VA911 has the left side of the heat figured out. You will need the left side air duct (930-106-021-50) to make it work. (or fab your own)

[VA911]

reckon i will be able to get the original heat duct to fit on the left side. I hope anyway. i actually tried it out and fits perfect. clears dizy by heaps. Now all i need is the right side

[Walt Fricke]

Peter

First off, are your SSIs the classic 3 into one, each bank exiting to the rear of the engine into a 2 in, one or 2 out, muffler?

And do you want to keep your engine mounted electric blower motor.

These backdate fanatics are harkening back to 1974 or earlier, when no such blower motor was installed. If you really need heat, you want the blower. But if you live in Florida and don't drive much north of there, I think you can get by with the stripped down (no blower) version nicely.

Either way, if you are converting to the '74 style SSIs (not just identical heat exchangers like you already have, but made of stainless), you will at a minimum need a small piece of tin that goes in the right rear corner (almost) of the tin that rims the engine, so the heater duct tubing can get through the tin on the right side and down into the exchanger opening.

Walt Fricke

[PeterCarrera84]

Thanks, for all the feed back, I would like to leave it like it is, meaning we do go north, , and heat could be needed on those trips to the mountains. Yes its 2 in 2out. This means I do not need to add anything right, what I have will mate with the new headers and heat exchanger ? I guess I was a bit confused. I want to have the benefit of a heater when needed.
thank you you all !!

[stormmaster]

you will need a new muffler....but nothing else for heat....

[ChrisBennet]

I don't see how you 3.2 guys can say that he won't need any extra ducting to use SSI's. Show me a picture of a 3.2 with SSI's that didn't require extra ducting in order to have heat.
-Chirs

[mb911]

Originally posted by ChrisBennet
I don't see how you 3.2 guys can say that he won't need any extra ducting to use SSI's. Show me a picture of a 3.2 with SSI's that didn't requiree extra ducting in order to have heat.
-Chirs

yes me to! I have seen many but if not done right it looks kobled together

This is what my engine looks like

[khamul02]

I would really like to see the right side metal that works with AC for backdated heat. Did any of you guy with ac and backdated heat fab your own? I would explect it would have to have an almost 90 degree elbow going down.

[syncroid]

Originally posted by khamul02
I would really like to see the right side metal that works with AC for backdated heat. Did any of you guy with ac and backdated heat fab your own? I would explect it would have to have an almost 90 degree elbow going down.

I started out with a factory one piece metal outlet for the right side. I took a pie piece out of it and re-welded in an inverted piece to clear the a/c brackets.

[khamul02]

But it seems to me that instead of making a 90 degree turn to the right it needs to go down to avoid the ac bracket.

[syncroid]

Originally posted by khamul02
But it seems to me that instead of making a 90 degree turn to the right it needs to go down to avoid the ac bracket.

You can't go down with the tube or it will go straight into the chain housing. You actually have more room with the 911SC compressor brackets then you do with the Carrera style.

[khamul02]

I guess I meant out and down. Enough to feed air into the hose that is sitting right there to start with. But I guess I need to take a closer look and see exactly how much room is out there going to the right.

[Walt Fricke]

So here's the deal, Peter:

You have switched to a better exhaust/muffler system - more HP. As a result you will have to modify your heating routing.

1) You can leave the plumbing from the outlet on the left side to the fan, and the fan itself..

2) Because the left side sheet metal has a hole for a heater hose to pass through, you should be able to get through there to the left side SSI just fine.

3) Because I have not done it, I don't know just how guys with 3.2s and the good SSIs who want to keep the electric blower motor (which I recommend if you want real heat - when jumping into a cold car with frost on the windshield you want all the air moving you can get to start with) do things.

The SC and 2.7s did it this way: at the blower outlet there is a Y fitting. One hose stays on the left side and goes throug the tin (#2). Another curves around over the top of the alternator/fan assembly, and then down to the other corner, and through the tin there. The problem is the AC stuff (which may be one reason Porsche rerouted things down below). I think the SCs (mine has none of the AC stuff) necked the tubing down to get past the AC bracketry. But I see from one of these posts that that is different. And even the retro (no blower) look requires special fitting of things.

You may be a pioneer, unless someone who has kept the blower on a 3.2 steps forth to say just how to do it.

Walt

[Rot 911]

Walt, the 3.2 has the footwell blowers which do a very good job of pumping heat into the cabin without the engine blower. The SSI's actually create more heat then the standard heat exchangers. I have found the combination of SSI's and the footwell blowers to be more/hotter air than the OEM set up.

[PeterCarrera84]

Walt thanks for trying to explain this to me , with all these threads I have read , I realize how little I know, and how much I have yet to learn about my wonderful driving machine ! ! I wish I had some one on location (Clearwater, St Pete,Tampa area) to assist me with this eventual instalation. Since I joined these forums beguining of Jan07 it has been very informative.!!! thanks again

peter

[PeterCarrera84]

Ben , your motor looks very kool, I bet it sounds super !! I will be talking with you soon. I an still not completely clear on what is involved, when replacing stock system for SSI's, I got lost at the "Y" connection.
cheers
Peter