Quick heater back-date quesiton...

[redstrosekNic]

Hello Pelicans,

I am in the process of doing a budget heater backdate on the 911. I am using this as a guide...

Quick ‘n’ Dirty 911 SC Heater Backdate

I cannot seem to find the exact sizes needed, but have found ones a bit smaller. Will anything be stressed from using an elbow with an I.D. of about 2.1in, rather than the 2.5 in of the elbow featured in the project? The reducer I can source also has this I.D. at it's smaller end. I don't care if the heating ability of the car suffers, I just do not want to cause any engine cooling issues.

Thanks for any input

[timmy2]

I'm assuming you are referrig to the elbow(s) supplying air to the heat exchangers.
If anything, a smaller size will allow more to be used for cooling for the engine.
Enjoy the backdating, mine works great.

[redstrosekNic]

Thanks guys.

[scotricker]

That's Awesome ! I opened the link, and that way looks simple and quick, but where can I get those parts in the US? Please let us know.

[redstrosekNic]

Originally Posted by scotricker

That's Awesome ! I opened the link, and that way looks simple and quick, but where can I get those parts in the US? Please let us know.

That's just it... I can't find the exact parts, so I'm considering using a pvc coupler (for the reducer) and a PVC street elbow for the elbow. Both parts found easily at the best store for Porsche tuning (Lowes), but a bit smaller in diameter than what the link I'm using calls for.

[scotricker]

I just thought of that, too! PVC. The air going through those connections is cold, well, not hot exhaust anyway, so I think PVC will work!

[cmonref]

Budget from Lowe's. It fits under the A/C compressor mount.

[MongooseGA]

Is the PVC able to stand up to the heat of the engine bay? I think I'd still prefer to use a metal piece. I'm looking around town to find these pieces now, actually. Shouldn't be too hard.

[BobbieShen]

The air going through those connections is cold

[MongooseGA]

Originally Posted by BobbieShen

The air going through those connections is cold

But can it hold up long-term to the ambient temps of the engine bay?

I'm assuming since it doesn't bother anyone else that the answer to the above is: yes.

What sort of tubing was used here (with the PVC items)? Was it sourced at Lowe's as well?

[smshirk]

I just ordered most of those hoses from pelican. They were fairly inexpensive. The only ones that weren't were to heater boxes. The long one that goes under compressor was 12 bucks or so

[jmohn]

I used ABS fittings 'cause they're black (PVC is white), both will withstand the heat found in this part of the engine bay. You'll need to find an alternative to welding to fasten the elbow to the block-off plate, I cut the glue ring from another coupler and used it on the back-side of the block-off plate and fastened to the elbow with ABS cement. Mine has been in there for 6-8 years now with no ill effects.

Jerry M
'78 SC

[redstrosekNic]

Some pics...

I will take a pic of the engine bay later to show the completed backdate.






For about $30 for the entire project, I couldn't go wrong!

[MongooseGA]

Looks like PVC is actually a decent option. What size did you end up with? And what sort of hoses did you go with? I just pulled my blower motor and hoses today. Going to button it back up to finish the back date after I finish all of my other maintenance items while the car is down for a week or two.

[redstrosekNic]

I used a 90* street elbow, 2in in diameter. I used the hoses already in the car, which are an aluminum type hose. They had to be cut down to the proper length. I cut the flare end of the pvc elbow off, and had to grind a groove into the elbow at each end to get everything to fit.

[MongooseGA]

Since you reused the aluminum hoses, would it be safe to assume you simply routed the driver's side hose directly to the heat exchanger?

[redstrosekNic]

I changed nothing with the aluminum hose connections other than connecting them to the outlets on the engine.

For the reducer, I went to a local muffler shop and had them make a 3in to 2.25in reducer, which I painted black to match the other piece.

[MongooseGA]

Looks great. Almost a shame, your blower looks so nice in the engine bay as well.

Thanks for sharing.

[redstrosekNic]

Originally Posted by MongooseGA

Looks great. Almost a shame, your blower looks so nice in the engine bay as well.

Thanks for sharing.

No problem! I might have left the blower in place, but it was not getting power. The heater actually works better now. Thanks for the kind words

[Determined]

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