Was the Fuel Injection unit used on C2s much different then the unit used on C1s as it looks different. Were the hard starting and other minor kinks worked out in 63 to 65 Fuelies?

 

Well, they certainly looked different, but the fundamental operating principles remained the same from '57 through end of production in '65. The differences were in the degree of refinement of the cold enrichment mechanism, the increasing sophistication of the idle circuit, and, of course, the greater air flow capability of the later units.


????? There is no hard starting issue with the early units.

The means by which fuel flow is initiated varied over the years, but the early units start and run just fine.

Jim

 

 

..

turn the key and its running,..now that was not so hard...simple 'aye...



http://s238.photobucket.com/albums/f...V62start17.flv

 

Of course I have heard different stories about early FI cars that never ran right and some even took the units off and went to carbs because of problems. One case comes to mind as my Father was service manager of a dealership in Brooklyn for most of his life and my older brother who started on the grease rack at 16 after quitting school tells me of a story of a customers car the mechanics could not get to run right so some big shot from Chevrolet was send down to tweak the car so it would start and run right. My brother tells me that after fiddling around for some time when they went to crank the car over they now had a fire under the hood? This was a new ea rely 60s Corvette? So in part I believe some of the stories I hear. Yet I remember my Dad bringing home a customers car which he did at times to road test and it was a 61 Fuelie and it ran just fine??? I can still remember him showing me how it could burn rubber in most of the gears. I was young but that memory still sticks in my mind.

 

I wouldn't doubt for a minute that these stories are true.

However, with 20-10 hindsight, it's clear the fault lay not with the fuel injection units but with the lack of knowledge on the part of those who attempted to work on them.

The early units work just fine, if they are set up correctly.



Anyone who can't get an early (or late) unit to work well should get out of the fuel injection repair business.

Jim

 

If you UNDERSTAND the Rochester system and its circuits, it is a really simple and reasonably good functioning fuel delivery system. Although, after MANY years of owning and rebuilding FI units, I'm STILL learning!
I have a highly modified FI unit on my 56, but yet each of the fundamental circuits has remained the same as designed (it's more or less the same as a 62 unit).
About the simplest way I can explain an FI unit is that it is like a 1bl Holley carb with a power valve.
As already mentioned, all FI units, from 57 to 65, use the same basic function principles, they just got refined as the models progressed.
The 327 units vs the 283 units did flow more air because of a redesign at the air meter opening, but the throttle valve of all air meters is the same size.
Recently a question was asked about the difference in performance between a 62 360hp unit and a 63 360hp unit. The opinion was that the 63 unit performed slightly better than the 62 unit. The physical appearance of the 2 units is considerably different, but their circuits are nearly identical. So if there is a difference in performance between the 62-63 units, it may be a result of the different design of the 63 plenum/legs.

Tom Parsons