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#1
11-12-2004, 12:38 PM
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What would be the differences on a carb designated for an automatic and one thats made for a manual transmission? Thanks
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#2
11-12-2004, 12:38 PM
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What would be the differences on a carb designated for an automatic and one thats made for a manual transmission? Thanks
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#3
11-12-2004, 02:29 PM
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There can be many differences. Some which may or may not be present:
(A) As a general rule, a carburetor for an automatic transmission is calibrated 1/2 size to 1 full size richer to compensate for losses in the fluid coupling. Hence lower fuel economy on vehicles with automatic transmissions. (B) The presence of a "dashpot" (slow closing throttle control valve). (C) The presence of a "hot idle compensation" valve. (D) Vacuum ports for the distributor may be ported or non-ported. (E) Throttle linkage may be different. (F) A vacuum port may be present for transmission control. These are general answers to a general question. Best to always know what characteristics are possessed by the correct carburtor, and then compare these to the characteristics of a different carburetor that you may wish to utilize. Jon.
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"Good carburetion is fuelish hot air".  "The most expensive carburetor is the wrong one given to you by your neighbor". If you truly believe that "one size fits all" try walking a mile in your spouse's shoes! Owner of The Carburetor Shop, LLC (of Missouri). Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings. |
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#4
11-12-2004, 03:21 PM
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Thanks Jon, yes very general question.. Specifically I have a 17057202 Qjet on the car right now. Consulting one site that matches the car to carbs that will or should fit states that a 17057203 or 7204 would also be appropriate. The 7203 is for a manual tranny and I have a chance at getting one dirt cheap so I just wanted to make sure that it would suit my needs. Thanks for your time.
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#5
11-12-2004, 03:44 PM
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As a general rule (remember that generals make rules to be broken by us lower ranking personnel
 ) carburetors designed for use with standard transmissions will have idle issues if placed on the identical engine with an automatic transmission (see "A" in my previous post); however, with your 1705 prefix, you are newer than my area of expertise.Jon.
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"Good carburetion is fuelish hot air". "The most expensive carburetor is the wrong one given to you by your neighbor". If you truly believe that "one size fits all" try walking a mile in your spouse's shoes! Owner of The Carburetor Shop, LLC (of Missouri). Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings. |
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#6
11-12-2004, 04:27 PM
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LOL I hear you, I figure it couldnt be any worse than what I have on there now and the way it idles. Thing needs a rebuild so bad its not funny. I ll probably try and get the 2 of them, practically being given to me anyways. Its only to put a carb on so I can rebuild the one on there at the moment.. Figure I ll give a rebuild on my own, if it doesnt work out right. Theres a place in Toronto that will rebuild it totally for 195 cdn including the recoloring and re-bushing.
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