Dual air meter FI unit
04-01-2014, 01:56 AM
#1
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Dual air meter FI unit
For those who may be interested in this sort of thing, here is one that I'm finishing up with.
The fuel meter side is virtually unchanged (but ONLY EXternally).
The fuel meter side is virtually unchanged (but ONLY EXternally).
04-01-2014, 06:07 AM
#4
Safety Car
Wow Tom, looks like a tremendous job. Looking forward to more info as you progress.
How did you block off the center stock port on the plenum? It almost looks like it's undetectable in the pictures.
Rich
How did you block off the center stock port on the plenum? It almost looks like it's undetectable in the pictures.
Rich
04-01-2014, 10:08 AM
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It was sent to me by one of the CF members right here.
It had NO starting circuit nor chokes. I fabricated everything for a starting circuit system just like on a 7380 unit (micro switch, 7380 fuel spider/solenoid and the fuel meter lid had to be changed). I fabricated all new main signal lines and rounded up everything to make the chokes work and fabricated vacuum lines for the choke pull off. The car will have headers, thus an exhaust heated choke tube cannot be used, so I installed elec choke covers---------------which work perfect!
The entire left side of the plenum was cut out, the runners were cut down to the floor of the plenum, a 1/2in alum plate welded in, machined, holes were cut in place and new studs installed.
Since there was no starting circuit, I had to fabricate a method of mounting a micro switch from scratch. So here is where I put it. With everything assembled, it's almost completely hidden.
This is the way the unit came to me. No chokes (the choke housing on the front AM is empty) and no micro switch.
It had NO starting circuit nor chokes. I fabricated everything for a starting circuit system just like on a 7380 unit (micro switch, 7380 fuel spider/solenoid and the fuel meter lid had to be changed). I fabricated all new main signal lines and rounded up everything to make the chokes work and fabricated vacuum lines for the choke pull off. The car will have headers, thus an exhaust heated choke tube cannot be used, so I installed elec choke covers---------------which work perfect!
The entire left side of the plenum was cut out, the runners were cut down to the floor of the plenum, a 1/2in alum plate welded in, machined, holes were cut in place and new studs installed.
Since there was no starting circuit, I had to fabricate a method of mounting a micro switch from scratch. So here is where I put it. With everything assembled, it's almost completely hidden.
This is the way the unit came to me. No chokes (the choke housing on the front AM is empty) and no micro switch.
Last edited by DZAUTO; 04-01-2014 at 10:24 AM.
04-01-2014, 10:44 AM
#8
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This is the more common method of building a dual air meter unit. This particular one was on the Grady Davis Gulf Oil racer.
And this is an early style which is on the SR2 that was recently sold by Rich Mason. This is the type that I want to build for the 56
This is one installed on one of Bill Thomas' Cheetahs.
And this is an early style which is on the SR2 that was recently sold by Rich Mason. This is the type that I want to build for the 56
This is one installed on one of Bill Thomas' Cheetahs.
04-01-2014, 05:29 PM
#10
Tom
did you modify the spill plunger/spill valve to compensate for the 1/2 strength main signal, or was that already done?
I know a bushing was installed in the "tack" type spill valve to decrease the id, and the head of the tack was reduced proportionally. Any photos AND dimensions would be appreciated. Bill Thomas supposedly did some special maching to the tips of the nozzles, but was secretive about details because he wanted to MARKET a dual a/m setup. What are the intake runner lengths (plenum floor to valve) on this unit versus a production plenum? As a FI guy (I run a 1963 unit on my 1956) I always enjoy your posts.Keep up the good work, and keep us updated. thanks.
did you modify the spill plunger/spill valve to compensate for the 1/2 strength main signal, or was that already done?
I know a bushing was installed in the "tack" type spill valve to decrease the id, and the head of the tack was reduced proportionally. Any photos AND dimensions would be appreciated. Bill Thomas supposedly did some special maching to the tips of the nozzles, but was secretive about details because he wanted to MARKET a dual a/m setup. What are the intake runner lengths (plenum floor to valve) on this unit versus a production plenum? As a FI guy (I run a 1963 unit on my 1956) I always enjoy your posts.Keep up the good work, and keep us updated. thanks.
04-01-2014, 05:44 PM
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The "thumb tack" style spill valve had already been modified as you mentioned. The Nozzles had been modified and the spring in the enrichment housing had about one coil cut off. All of the above were modifications per Bill Thomas' specs.
Originally, I was tasked to install a starting circuit. One thing led to another, and I did a total rebuild in addition to the other things.
I'm especially pleased with the way the chokes turned out.
Originally, I was tasked to install a starting circuit. One thing led to another, and I did a total rebuild in addition to the other things.
I'm especially pleased with the way the chokes turned out.
04-02-2014, 08:50 AM
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It's not my unit. It belongs to one of the CF members here. As I understand, he has a 63 race car that it will go on. We'll have to wait until he gets it installed to see how it does.
04-02-2014, 09:55 AM
#14
Melting Slicks
Attaboy
Hats off to you guys with the skills to make these things happen. My skill level is pretty much limited to changing parts out, and I have great admiration for the experts.
04-02-2014, 10:58 AM
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Tom,
A guy in Columbus , Ohio had a C1 dual air horn unit on Craigslist a few years ago.
Very cool.
I just couldn't afford it at the time.
Bruce B
A guy in Columbus , Ohio had a C1 dual air horn unit on Craigslist a few years ago.
Very cool.
I just couldn't afford it at the time.
Bruce B
04-02-2014, 03:10 PM
#16
Drifting
The "thumb tack" style spill valve had already been modified as you mentioned. The Nozzles had been modified and the spring in the enrichment housing had about one coil cut off. All of the above were modifications per Bill Thomas' specs.
Originally, I was tasked to install a starting circuit. One thing led to another, and I did a total rebuild in addition to the other things.
I'm especially pleased with the way the chokes turned out.
Originally, I was tasked to install a starting circuit. One thing led to another, and I did a total rebuild in addition to the other things.
I'm especially pleased with the way the chokes turned out.
Very interesting looks killer!
rustylugnuts
04-02-2014, 03:22 PM
#17
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) but it looks like they come up a little short. Don't know whether this Gulf Oil dyno sheet is for a 327 or a 377 engine. It says 327. I have always heard, they don't run worth a crap over the whole rpm band!http://www.racingicons.com/gs/004/gulf.htm
Last edited by MikeM; 04-02-2014 at 03:33 PM.
04-02-2014, 05:18 PM
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St. Jude Donor '07
Hold yer fire. I'm merely the messenger() but it looks like they come up a little short. Don't know whether this Gulf Oil dyno sheet is for a 327 or a 377 engine. It says 327. I have always heard, they don't run worth a crap over the whole rpm band!
http://www.racingicons.com/gs/004/gulf.htm
) but it looks like they come up a little short. Don't know whether this Gulf Oil dyno sheet is for a 327 or a 377 engine. It says 327. I have always heard, they don't run worth a crap over the whole rpm band!http://www.racingicons.com/gs/004/gulf.htm
) your chart seems to support that theory...Bill
04-02-2014, 05:40 PM
#19
Burning Brakes
The "thumb tack" style spill valve had already been modified as you mentioned. The Nozzles had been modified and the spring in the enrichment housing had about one coil cut off. All of the above were modifications per Bill Thomas' specs.
Originally, I was tasked to install a starting circuit. One thing led to another, and I did a total rebuild in addition to the other things.
I'm especially pleased with the way the chokes turned out.
Originally, I was tasked to install a starting circuit. One thing led to another, and I did a total rebuild in addition to the other things.
I'm especially pleased with the way the chokes turned out.
04-02-2014, 05:43 PM
#20
Burning Brakes
It was sent to me by one of the CF members right here.
It had NO starting circuit nor chokes. I fabricated everything for a starting circuit system just like on a 7380 unit (micro switch, 7380 fuel spider/solenoid and the fuel meter lid had to be changed). I fabricated all new main signal lines and rounded up everything to make the chokes work and fabricated vacuum lines for the choke pull off. The car will have headers, thus an exhaust heated choke tube cannot be used, so I installed elec choke covers---------------which work perfect!
The entire left side of the plenum was cut out, the runners were cut down to the floor of the plenum, a 1/2in alum plate welded in, machined, holes were cut in place and new studs installed.
Since there was no starting circuit, I had to fabricate a method of mounting a micro switch from scratch. So here is where I put it. With everything assembled, it's almost completely hidden.
This is the way the unit came to me. No chokes (the choke housing on the front AM is empty) and no micro switch.
It had NO starting circuit nor chokes. I fabricated everything for a starting circuit system just like on a 7380 unit (micro switch, 7380 fuel spider/solenoid and the fuel meter lid had to be changed). I fabricated all new main signal lines and rounded up everything to make the chokes work and fabricated vacuum lines for the choke pull off. The car will have headers, thus an exhaust heated choke tube cannot be used, so I installed elec choke covers---------------which work perfect!
The entire left side of the plenum was cut out, the runners were cut down to the floor of the plenum, a 1/2in alum plate welded in, machined, holes were cut in place and new studs installed.
Since there was no starting circuit, I had to fabricate a method of mounting a micro switch from scratch. So here is where I put it. With everything assembled, it's almost completely hidden.
This is the way the unit came to me. No chokes (the choke housing on the front AM is empty) and no micro switch.