Rochester FI on C3 ?
Thread Starter
Pro
Joined: Feb 2003
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From: Ontario California
Rochester FI on C3 ?
I was just curious if anyone has ever seen a Rochester Fuel Injection
on a C3? I would think if they worked ok with a 327, they should work the same on a 350. Perhaps the throttle body might have to be a little larger for the extra displacement. I had the FI unit on my 64 couple and was happy with it. It would get better mileage then the carburated cars...if you kept your foot out of it. Oh course now, the
Rochester units are considered "collector items" and the prices are out of sight.
Jeff
on a C3? I would think if they worked ok with a 327, they should work the same on a 350. Perhaps the throttle body might have to be a little larger for the extra displacement. I had the FI unit on my 64 couple and was happy with it. It would get better mileage then the carburated cars...if you kept your foot out of it. Oh course now, the
Rochester units are considered "collector items" and the prices are out of sight.
Jeff
Team Owner
Joined: Jan 2006
Posts: 37,637
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From: Crossville TN
Yes. The FI unit would be worth about twice what the car is worth! There are aftermarket FI units that look much like the old Rochester FI and are much more affordable. And, they do the job better with the O2 sensors and such.
Race Director
Joined: Jan 2000
Posts: 12,399
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From: San Jose CA
Agree w/ 7T1Vette.
The Rochester FI is really used to massively increase the value of a car that was originally equipped with it.
It likely has better fuel atomization than a carburetor, but far more specific tuning requirements.
A TPIS MiniRam, GM RamJet, or Holley Stealth Ram will all achieve a decently respectable fuelly "look", and work significantly better.
The Rochester FI is really used to massively increase the value of a car that was originally equipped with it.
It likely has better fuel atomization than a carburetor, but far more specific tuning requirements.
A TPIS MiniRam, GM RamJet, or Holley Stealth Ram will all achieve a decently respectable fuelly "look", and work significantly better.
Melting Slicks
Joined: Sep 2004
Posts: 2,655
Likes: 19
I'll throw this in just for the uber cool aspect of modern efi in a Rochester setup.
http://www.vetteweb.com/tech/vemp_07...te_efi_system/
http://www.vetteweb.com/tech/vemp_07...te_efi_system/
Burning Brakes
Joined: Jun 2009
Posts: 840
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From: Syracuse IN
Most of the (TBI) Throttle Body Injected units were built by Rochester. So, ya I have seen a few in C3's All of the 82's. We are currently running a 650 CFM Rochester TBI in our 350 Chevrolet in one of our Jeep CJ7.
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Yes, i wanted to say the LT1 conversion is a close match but with electrionic FI.
I believe u can convert the LT1 intake to GEN I by drilling out the distributor hole - but i can't recall how they make the thermostat crossover. Maybe they (GEN 3 camaros or C4 vette owners) use a different manifold base. But I have read its been done and maybe a forum search would find one.Good luck and post what u can find,
cardo0
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I was just curious if anyone has ever seen a Rochester Fuel Injection
on a C3? I would think if they worked ok with a 327, they should work the same on a 350. Perhaps the throttle body might have to be a little larger for the extra displacement. I had the FI unit on my 64 couple and was happy with it. It would get better mileage then the carburated cars...if you kept your foot out of it. Oh course now, the
Rochester units are considered "collector items" and the prices are out of sight.
Jeff
on a C3? I would think if they worked ok with a 327, they should work the same on a 350. Perhaps the throttle body might have to be a little larger for the extra displacement. I had the FI unit on my 64 couple and was happy with it. It would get better mileage then the carburated cars...if you kept your foot out of it. Oh course now, the
Rochester units are considered "collector items" and the prices are out of sight.
Jeff
Pro
Joined: Nov 2009
Posts: 667
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From: Milpitas Calyfornua
I have run 65 injection unit on our 71 for many years. Currently is off the car, always had to remove to pass Calyfornua smog inspection, but inspection no longer required on 71's,,, but will be going on again one day. Loved the look, the smoothness of the engine and fuel economy was far better. Engine is a de-stroked 400 ci,,,about 380 inches or so now.
Simple installation,,,you must set up for using a cable connection,,,65's use a rod,,,for the accelerator,,,,simple custom mounting bracket is required for the cable. You must use either an LT-1 or big block hood for clearance,,,and you must devise an air cleaner.
***** out performance will be down a bit as Rochester is only 625 CFM or so, whereas with a 700 Holley double pumper or 780 vacuum carb, engine had more air and fuel to work with.
Simple installation,,,you must set up for using a cable connection,,,65's use a rod,,,for the accelerator,,,,simple custom mounting bracket is required for the cable. You must use either an LT-1 or big block hood for clearance,,,and you must devise an air cleaner.
***** out performance will be down a bit as Rochester is only 625 CFM or so, whereas with a 700 Holley double pumper or 780 vacuum carb, engine had more air and fuel to work with.
Last edited by Sxrxrnr; Oct 2, 2012 at 01:21 PM.
Team Owner
Joined: Jan 2006
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From: Crossville TN
Air/fuel flow from that Rochester FI is a bit disappointing, if your 625 CFM estimate is correct. I would have thought it would have more capacity than that. Any Q-Jet can do 750 CFM; some can flow 800 or more.
But, that doesn't change how cool the Rochester unit would look on a C3. I've thought about it myself....then I woke up and realized the $$$ involved.
But, that doesn't change how cool the Rochester unit would look on a C3. I've thought about it myself....then I woke up and realized the $$$ involved.
Thread Starter
Pro
Joined: Feb 2003
Posts: 715
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From: Ontario California
Duel Throttle Bodies
Back in the 60's on the Bill Thomas Cheetah...they took a Rochester FI unit and modified it with two throttle bodies mounted on top. I assume this was to get more air flow into the engine.
Le Mans Master
Joined: Oct 2002
Posts: 7,098
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From: Las Vegas - Just stop perpetuating myths please.
TPI to LT1 conversion.
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
Well the easier route would be the Holley Stealth Ram or TPIS mini-ram (as mentioned) and probably make more power too. Even GM performance has a 350 "ram" FI for sale too.
And Edlebrock. Just all those manifolds have the throttle body and air cleaner stuck on the end which takes from the vintage look.
I think all are an improvement over the carb or vintage FI but the C3 just looks better with the air scoop sticking upwards rather than forwards. Yeah that cheetah is bad azz looking.
cardo0
And Edlebrock. Just all those manifolds have the throttle body and air cleaner stuck on the end which takes from the vintage look.I think all are an improvement over the carb or vintage FI but the C3 just looks better with the air scoop sticking upwards rather than forwards. Yeah that cheetah is bad azz looking.
cardo0
Last edited by cardo0; Oct 5, 2012 at 03:56 PM. Reason: missing adverb
Pro
Joined: Nov 2009
Posts: 667
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From: Milpitas Calyfornua
I am not certain if I am remembering correctly, but think that I've seen a Rochester unit with 2 air meters on the left side of the dog house. Likely someone will correct me if I'm remembering wrongly.
Instructor
Joined: Mar 2014
Posts: 110
Likes: 10
Rochester Fuel INJECTION ON C3
I have run 65 injection unit on our 71 for many years. Currently is off the car, always had to remove to pass Calyfornua smog inspection, but inspection no longer required on 71's,,, but will be going on again one day. Loved the look, the smoothness of the engine and fuel economy was far better. Engine is a de-stroked 400 ci,,,about 380 inches or so now.
Simple installation,,,you must set up for using a cable connection,,,65's use a rod,,,for the accelerator,,,,simple custom mounting bracket is required for the cable. You must use either an LT-1 or big block hood for clearance,,,and you must devise an air cleaner.
***** out performance will be down a bit as Rochester is only 625 CFM or so, whereas with a 700 Holley double pumper or 780 vacuum carb, engine had more air and fuel to work with.
Simple installation,,,you must set up for using a cable connection,,,65's use a rod,,,for the accelerator,,,,simple custom mounting bracket is required for the cable. You must use either an LT-1 or big block hood for clearance,,,and you must devise an air cleaner.
***** out performance will be down a bit as Rochester is only 625 CFM or so, whereas with a 700 Holley double pumper or 780 vacuum carb, engine had more air and fuel to work with.
Love the looks, since my '62 was a factory fuelie, I was rather hooked.