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#1
21-04-09, 14:54
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I always thought that any old 94 type carb had an economizer valve. It opens up another passage when the vacuum drops and more fuel is needed. The economizer bit is for when the passage is closed and you get better economy. All Holley carbs use them too. The valve serves the same function as the metering rod setup on Carter and Rochester carbs.
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set 1940 Cab 11 C8 cab and chassis 1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun 1940 Cab 11 F15A w/ Chev rear ends 1941 Cab 12 F15A 1942-44 Cab 13 F15A x 5 1942 cab 13 F15A with 2B1 box 1943 cab 13 F15A with 2H1 box 1943 Cab 13 C8A HUP 1944 Cab 13 C15A with 2C1 box 1943 Cletrac M2 High Speed Tractor MkII Bren gun carrier chassis x 2 
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#2
22-04-09, 04:17
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Holley 94
I always called the valve in question a power valve.
Here is a link to an exploded drawing. http://www.vanpeltsales.com/FH_web/F...rd1938to48.jpg Paul
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#3
22-04-09, 10:23
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Paul and Alex
Paul, I see your "official" picture has it labelled as an "economiser" valve.
Alex. I thought you were akin to God, but it apears you are a mere mortal. If you do a google search, you will find they are commonly called an economiser valve.
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Bluebell Carrier Armoured O.P. No1 Mk3 W. T84991 Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6. Dodge WC55. 37mm Gun Motor Carriage M6 Jeep Mb #135668 So many questions....
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#4
24-04-09, 08:46
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The original Economiser or Power valve used in the Holley 94 Carb opened at 7.5in Hg vacuum. These Power valves are identical to the current valves used in modern Holley Carbs (eg Holley 650, 750 Quad carbs, etc) and are available nowadays in a variety of vacuum ratings, or even as a blank-off valve that doesn't open. They come in 2.5in Hg to 10.5in, and going to a 5.5 or 6.5 is handy to eliminate valve recession and burnt valves with modern unleaded fuels, but fuel economy will suffer, and if you should be running twin carbs on your Ford then going to 4.5 will be necessary to get them to open at all!
BTW, if you should also need Main Jets for your Holley 94, these are also identical to the Modern Holleys (and therefore readily available), and are a .051 size as standard.
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#5
30-04-09, 23:25
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Had to order the carb overhaul kit from Macs autos in the States still need a oil filter and head gaskets dont know if i can source in the UK as yet. Did manage to find a NOS contact set on ebay tho, and have got a quote to refurb the waterpumps.
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#6
01-05-09, 00:49
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head gaskets?
Hi Alan
Are you talking 21 stud engine block AKA pilot/ uk built engine Or Mercury 24 stud. If 21 stud head gaskets come up on Ebay fairly often and not over expensive. Regards stephen. 
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