Why remove smog pump off 2.7l?

[the_win]

I have a 76 911S Targa. I've read some threads, saying that they removed the smog pump, from these kind of engines. I don't think it takes much horsepower from the engine, if any, and I would think that it would cool the exhaust gases, keeping the engine slightly cooler. Since the exhaust goes right pass the engine.

So why disconnect the smog pump?

[Adam]

Welcome to the board!

As I understand, it's quite heavy. Seeing that you don't live in CA, it's also a superfluous piece of engine bay equipment that restricts access to the left side cylinder bank.

I'd remove it (mine's gone), but keep it in a box for the next owner.

[john walker's workshop]

adding air to the exhaust just as it exits past the exhaust valve actually makes the exhaust hotter, the object of which is to help burn any unburned fuel that otherwise would be discharged into the atmosphere. cars with air pumps run just the same as those with it removed. they do get in the way of valve adjusts and sparkplugs, and the engine does look better with it gone. emission standards for the engines that had the pumps are fairly loose, so most can be adjusted to pass smog without it, unless there's a visual test required.

[k9handler]

I have a pump for sale if anyone is interested...like new!

[Adam]

K9,

I've got some old warped Magnesium valve covers and a crummy 5-blade fan for sale too...

[makaio]

If you remove it (which I recommend if you don't need for smog), make sure to plug diverter valve. Other wise it will run like crap(ask me how I know). Of course, that's if you don't remove the whole assembly.

[k9handler]

Cool Adam,
I can trade you a slightly used tie-rod end, a half used set of squeaky brake pads, and a broken clock! ha ha

[dtw]

How about the rusty metal boogers I just sliced out of the nose of my new '72? Original, vintage, Porsche sheetmetal; with that "patina" of age.

[Adam]

Hmm. I'm also looking to "unload" my old school-bus sized original steering wheel... I'll swap you for the rusty boogers!

[Zeke]

Win, In the '80s,I had a 2.7 totally rebuilt here in CA at Andial. At first, I ran the pump with the belt off. Then I put the belt on for smog. Then, sometime later, I took the belt off. Pretty soon the pump was almost frozen. I kept asking Arnold at Andial what I am doing to the motor putting it on again, off again. He said no big deal but he also said that he was supposed to tell me to leave it on because of being licensed as an auto repair facility in CA. As far as I could tell, he didn't care if it was hooked up or not and I couldn't tell any difference either. I know this contradicts what JW said, but that is the way it was. In the end, I ran the belt. Owned the car for 15 years.

[dtw]

Originally posted by Adam Chaplin
Hmm. I'm also looking to "unload" my old school-bus sized original steering wheel... I'll swap you for the rusty boogers!

Noooooooo! I seem to have accumulated 3 or 4 of those things...I think they multiply when I turn out the light...each one more scratched, worn, and rusty than the last.

[sbarrett]

I removed the smog pump when I upgraded to Carrera tensioners...and my car runs much better. I keep it handy for my once-a-year inspection.