Double Pulley on a 70GT?

EJprovost · 12-02-2005

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 · 12-02-2005

It's to run an AC compressor.

David McCollam · 12-02-2005

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 · 12-02-2005

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 · 12-02-2005

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 · 12-02-2005

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 · 12-02-2005

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 · 12-02-2005

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 · 12-02-2005

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 · 12-02-2005

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 · 12-02-2005

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 · 12-02-2005

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 · 12-02-2005

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 · 12-02-2005

Trouble is I have not seen that box in 20 years

Otto has been looking for one for almost that long.

EJprovost · 12-02-2005

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 · 12-02-2005

Liz;
The air pump was really something no one wanted

EJprovost · 12-02-2005

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 · 12-22-2005

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 · 12-22-2005

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 · 12-22-2005

(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 · 12-22-2005

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.

12-02-2005	#3 (permalink)
David McCollam Member Join Date: Jan 2004 Location: Texas Posts: 559 Classified Rating: 100% (1)	Double pulley. 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

12-02-2005	#6 (permalink)
GTJIM 4246 Post Club Join Date: Jun 2003 Location: New Zealand Posts: 5,524 Classified Rating: 0% (0) Provided Answers: 4	Ara & Gm 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.

12-22-2005	#20 (permalink)
EJprovost Senior Contributor Join Date: Oct 2004 Location: Utah Posts: 591 Classified Rating: 0% (0)	(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! Last edited by EJprovost; 12-22-2005 at 10:29 PM..

12-02-2005	#2 (permalink)
nobody No Access Join Date: Nov 2003 Location: in transit Posts: 3,873 Classified Rating: 0% (0)	It's to run an AC compressor.

12-02-2005	#4 (permalink)
BQS4 Southern Red Neck Join Date: Mar 2002 Location: Snellville, GA Posts: 5,058 Classified Rating: 0% (0) Provided Answers: 1	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.

12-02-2005	#5 (permalink)
EJprovost Senior Contributor Join Date: Oct 2004 Location: Utah Posts: 591 Classified Rating: 0% (0)	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?

12-02-2005	#7 (permalink)
nobody No Access Join Date: Nov 2003 Location: in transit Posts: 3,873 Classified Rating: 0% (0)	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.

12-02-2005	#8 (permalink)
EJprovost Senior Contributor Join Date: Oct 2004 Location: Utah Posts: 591 Classified Rating: 0% (0)	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.

12-02-2005	#10 (permalink)
jlthunder 1000 Post Club Join Date: May 2003 Location: Salfordville, PA Posts: 1,841 Classified Rating: 0% (0)	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).

12-02-2005	#11 (permalink)
tomking Member Join Date: Aug 2002 Location: SW Missouri Posts: 1,071 Classified Rating: 0% (0)	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!

12-02-2005	#14 (permalink)
Gary Site Admin Join Date: Mar 2002 Location: Swansea, MA Posts: 4,764 Classified Rating: 0% (0) Provided Answers: 2	Trouble is I have not seen that box in 20 years Otto has been looking for one for almost that long.

12-02-2005	#16 (permalink)
BQS4 Southern Red Neck Join Date: Mar 2002 Location: Snellville, GA Posts: 5,058 Classified Rating: 0% (0) Provided Answers: 1	Liz; The air pump was really something no one wanted