Double Pulley on a 70GT?

[EJprovost]

Looks like Christmas vacation from College, the GT gets some help. Hmmm, wonder what this double pulley is for. Any advice is greatly appreciated.

[nobody]

It's to run an AC compressor.

[David McCollam]

Depending on the year of manufacture, it could be for an A/C compressor or the Opel Emission Control System (OECS) air pump. That system was discontinued in 1970 I believe.

Dave

[BQS4]

Liz;
See if there's fittings on the top of each exhaust where it bolts to the head. Those are fittings for the emissions system Dave McCollam was talking about.

[EJprovost]

I knew there were two kinds of pulleys manufactured. The history is great! Also being able to tell the difference between the two would be nice. What year was the air conditioner pulley manufactured?

[GTJIM]

The a/c units were not factory fitted - they were put on by the Dealers and so could be fitted to any year even after the car had been sold.
Early on the so called "ARA" unit was fitted but later (1972ish ?) GM produced their own kit which had much taller air vents.

[nobody]

If my memory is correct this one had AC and the tall center console went to Tim. I've never seen a GT with the air pump in any year.

[EJprovost]

Tim got the air stuff out of the 71. This one is the 70, thats why I was a little suprized. Still don't know if its for air conditioning or emissions yet tho, this car doesn't have remnants of either in it.

[BQS4]

Originally Posted by nobody If my memory is correct this one had AC and the tall center console went to Tim. I've never seen a GT with the air pump in any year.

Dave;
I have one, my 69, had to re-seal the the injector nozzles just to get it timed right, but, it had an air pump on it.

[jlthunder]

The pully in the picture looks like the one I have. Mine is from a '74 Manta with A/C which now resides on my GT(the pully, not the AC).

[tomking]

Well if anyone wants to trade that double pulley for the correct single I have plenty of the singles for you to make it right!

[Gary]

Originally Posted by BQS4 Dave; I have one, my 69, had to re-seal the the injector nozzles just to get it timed right, but, it had an air pump on it.

My '69 had an air pump that I removed in 1977. Still have it in a box.... somewhere....

[EJprovost]

Originally Posted by Gary My '69 had an air pump that I removed in 1977. Still have it in a box.... somewhere....

Cool! So I take it the double pully is one for the air pump. How much do you want for it? Send me an e-mail OK, lets talk.

[Gary]

Trouble is I have not seen that box in 20 years

Otto has been looking for one for almost that long.

[EJprovost]

Originally Posted by Gary Trouble is I have not seen that box in 20 years Otto has been looking for one for almost that long.

How funny! I take it these things are rare then.

[BQS4]

Liz;
The air pump was really something no one wanted

[EJprovost]

Originally Posted by BQS4 Liz; The air pump was really something no one wanted

Except to a true collector of original parts. My curiosity was truly for the historical events and the differences between the pulleys. Most interesting!

[tekenaar]

Originally Posted by nobody If my memory is correct this one had AC and the tall center console went to Tim. I've never seen a GT with the air pump in any year.

True, the air pumps were only used on the '68 models and, even then, somewhat sporadically at best.

[tekenaar]

Originally Posted by Gary My '69 had an air pump that I removed in 1977. Still have it in a box.... somewhere....

Yeah, that's what you said ~2 years ago . . . must be one of those rare 'phantom' air pumps . . .

[EJprovost]

(Quote from Dave on the first page, where he thought the Air Conditioning stuff came out of Kats Car)Then you replied on # 18

Otto; Dave remembered wrong! The air stuff was taken off Lisa's 71GT. This one that the double pulley is on is Kat's GT. Dave never saw either one of these GT's in person. I'm still in question which pulley this one is for? Kats GT has no carbon filter, but does have a bunch of tubes I don't recognize!

[tekenaar]

Originally Posted by EJprovost Otto; Dave remembered wrong! The air stuff was taken off Lisa's 71GT. This one that the double pulley is on is Kat's GT. Dave never saw either one of these GT's in person. I'm still in question which pulley this one is for? Kats GT has no carbon filter, but does have a bunch of tubes I don't recognize!

Pulley function in first post:

Originally Posted by nobody It's to run an AC compressor.

To paraphrase and recap what I said in IM, charcoal canister was only used in '73 GT. '73 GT was only year for electric choke, all the earlier years had water chokes.

In general, most GTs, with a few exceptions, came with mechanical secondary Solexes. All other models, again with a few exceptions, came with vacuum secondary Solexes. '68-'72 CIH Opels came with water choke Solexes, '73-'74 came with electric choke Solexes and all '75 models, 1900s and Mantas, used Bosch L-Jetronic FI.

[tekenaar]

Originally Posted by BQS4 Liz; The air pump was really something no one wanted Originally Posted by EJprovost Except to a true collector of original parts. My curiosity was truly for the historical events and the differences between the pulleys. Most interesting!

Or to someone like me who wants to modify it for an entirely different function . . . convert it to a vacuum pump and use it for crankcase evacuation on my 2.2 SSD engine . . .

[hrcollinsjr]

Why wouldn't you just do what drag racers do and use the exhaust to evacuate your crankcase?

I suggested this to a friend running circle track and he swore it revved quicker. But then again everything he did made him go quicker.

Harold

[EJprovost]

Thanks Guys! I am truly am getting a fantastic education here at Opel school.

[Gary]

Originally Posted by tekenaar Yeah, that's what you said ~2 years ago . . . must be one of those rare 'phantom' air pumps . . .

That box might be at the Ex's. I have never found the NOS torque tube center piece set up that was with it either...