backdating heating questions

[davis911s]

Ok I have already taken the blower out of my engine compartment. I never drive my car in the winter, so heat isn't a big deal. I searched the archives and couldn't find what I wanted.

Should I seal off the hole where the shroud on the drivers side of the fan is, the seal of the holes in the engine tin and finally seal off the holes in the exchangers. Would I get any heat?

OR

Would I be better off replacing the shrouds on the side of the fan with the older ones. ( I have one for the left side from a 70, the right side is the same as my 77, it is solid NO hole)

So should I backdate or seal it all up?

Would the engine run cooler if it is all sealed up? All the fan air would blow over the cylinders that way!?!

Opinions?

Shawn

[wckrause]

If you don't back date it. Then you want to seal both the opening to the engine shroud, and the openings to the heat exchangers. If you leave the openings to the heat exchangers open, you'll get hot air pulled backwards through the exchangers and into the cooling fan, because of the vacuum created inside the engine compartment by the cooling fan.

Backdating the heating system looks like a pretty good idea in terms of appearance (and some weight savings), plus you still get a good supply of heat.

[Superman]

It depends whether you want heat or not. If you do, then backdate. I am about to backdate, and there are threads you can search. If you do not want heat, then yes, your engine will cool just a little better. You will need to seal them off, like with straight plates which are available, and perhaps easy to fabricate. I think I'd also seal off the heater hose system, to be sure you don't get any bad air into the cabin. Cabins often have negative air pressure so they can suck fumes in. You would be free to choose plain headers with no heat exchanger tin. Straight headers look way cooler.

[davis911s]

Thanks guys

Superman yes i would like to keep a little heat.Would i not get any heat by blocking?

Wkrause It is blocked now, I am just wondering if I will have ANY heat?

Shawn

[Superman]

In order for you to have heat, air needs to move from the engine compartment, down through the heat exchanger and forward into your car. So, the system just needs to be working.

[tbitz]

Here are a couple of pics that show the back dated heating. I did this and it has reduced alot of the clutter in the engine bay. Heating is not the best when the engine is idling, but when on the H/W it is blazing hot.

[img]http://www.pelicanparts.com/ultimate/image_uploads/Jam90.jpg
[/img]

[img]http://www.pelicanparts.com/ultimate/image_uploads/Jam94.jpg
[/img]


[img]http://www.pelicanparts.com/ultimate/image_uploads/backdatedheating.jpg
[/img]

[tbitz]

try again for the pics....

[davis911s]

Thanks again

OK SO I have everything to backdate minus the piece that goes on the right side of the fan. I know everyone wants to do this, but someone give me there's!!! Don't be selfish

Seriously if anyone has one or knows if they can be fairly easily fabricated let me know.

Shawn

[Vipergrün]

Here is a the list of items needed to do this conversion. I got the list from a fellow lister. From what I understand, the left-side duct is all metal and the right has a steel cover with a plastic hose;


Left hot air duct, 930.106.321.02, list $148.20
4 plastic nuts, 999.591.592.40, list $.12 each
2 rubber plugs, 999.703.044.50, list $.77 each
Right hot air duct, 911.106.327.00, list $53.45
Right engine cover plate, 911.106.036.00, list $14.89
Right engine cover, 911.106.827.00, list $5.04
Right air duct support, 911.106.331.00, list $1.30

I will be ordering these parts soon myself from a local dealer. Hoping for a nice PCA discount

cheers
-Brad
80SC

[tbitz]

I found mine on the Pelican Classified section. Just ask someone who is parting an older 911 if he has these pieces. I got both ducts for $25US.

[jwetering]

I backdated my system - the left side came from a wrecker and cost me $50 canadian....be careful though, the part is too fat to fit behind the distibutor. An hour or two of careful tapping with a ball peen hammer will bring it into the right shape (I destroyed one duct by being impatient - you're not a Taurus are you?).

The right side was new from Porsche - it's apparantly a stock 930 part. The parts I got were a three piece affair - not too bad, but I've seen one piece setups that are easier to deal with.

Here's a pic of my setup.

[stormcrow]

Shawn,

If you do decide to wait before you backdate your heating system, make sure you close off any temporary openings in the engine compartment.

If you don't there is the possibity of carbon monoxide entering the cabin. Carbon monoxide could be backdrafted through the openings under the vehicle if you remove those hoses. You need to have a positive pressure on all heater hoses or seal them off temporarily.

Steve

[davis911s]

Stormcrow thanks for the advice. Yes I will be backdating, as I was only missing one part I found one here in Canada for $30Cdn, so now it will just be a matter of fitting them in there.
JWETERING- I'll be sure to go slow and take my time, I guess I am lucky I am not a Taurus

Thanks all, I will post pics
Shawn

[CamB]

Fairly full instructions exist over on the Rennlist BBS:

http://forums.rennlist.com/scripts/rennforums/ultimatebb.cgi?ubb=get_topic&f=1&t=000034

Just make sure you come back here

[rstoll]

Heater is backdated! Thanks to Jeff for supplying the needed parts.

[Gunter]

Very nice Robert: Any plans to get rid of the cruise control? And, can the position for the fan clamp screw be anywhere? It seems to me that I have seen that screw more to the left. But??? You must be happy about the extra room.
Jasper: Looks good. I also found it tight around the distributor. After I removed the A/C, Cruise and heater blower, I could actually work in there. Anyone needs parts for A/C?
Shawn: It works really well with SSI's. With SSI's and a Flowtrough muffler, it sounds just right for me.

[Gordo2]

I'm looking at these pictures trying to figure out how this works.

I take it that once you backdate it, your alternator fan then acts like the blower for your heater system?

Wouldn't it take away from air blowing across the heads if that were the case?

Gordo

[david914]

Along these same lines, can you perform the same backdate on an SC with A/C? Looks to me like the right side fan shroud piece would interfere with the A/C compressor. Will it work?

[stealthn]

Good thread Shawn!

I saw some of these types of pictures and wow that sure cleans up the engine. I had the same question about the AC as I'm not ready to remove it yet.

Let me know how it goes Shawn, and how the heat is on those cold Alberta spring mornings

[tsuter]

Does not affect the AC when using the correct cover plates.