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I have encountered the first issue with my new (at least to me) 1964 FI unit.
When I first removed the lid, I found two large lumps of silicone on the bottom of the plenum, near where the air meter attaches. I removed the silicone at that time, but did not check any further.
I went back in and cleaned the areas this morning.
I found two hairline cracks, each about 2 inches long, one on each side of the area where the air meter attaches at the bottom.
I can see the hairline cracks on both the inside and the outside of the plenum.
They both look like easy repairs by an decent aluminum welder.
But, I thought I would ask for suggestions on repairs.
1. Bare 1964-1965 Plenum, no tag, two feet welded for repair
2. Polished 1963 (dated Dec 1962) base adapter (manifold) with casting numbers removed
3. Chrome 1963 oil fill tube with cap and side vent
4. Good condition 1963 7375 Plenum with no apparent damage or modifications
5. 1963 spider assembly
6. 1963 - 1965 lid and attaching bolts, good condition, most bolts missing the aluminum washers
7. 1963 air meter assembly, good condition
8. 1963-1965 nozzle blocks (4, good condition)
9. 1964 Complete Rochester FI unit with damaged (cracked) 7380 plenum, 1964 1111063 distributor, complete, appears to be fully functional, good condition base adapter (manifold) with 3826810 casting number and dated 10 1 63, complete and appears to be in good condition 1964 fuel meter assembly, complete and appears to be in good condition 1964 air meter assembly, fuel pump to fuel filter fuel line, 1957 air filter assembly, needs rechroming.
So, to summarize
One fuel meter assembly, three air meter assemblies, two base adapters (manifolds), three plenums, one distributor, one air filter assembly (1957 vintage), and assorted parts.
And I do not think that the cracked plenum will impact the bench testing efforts, but the unit will need to be disassembled for repair.
Those 'cracks' look more like casting flaws, and were probably there from day one. Other experts will hopefully chime in....but looking at the rest of the casting, it looks like they have always been there.
Those 'cracks' look more like casting flaws, and were probably there from day one. Other experts will hopefully chime in....but looking at the rest of the casting, it looks like they have always been there.
While I don't consider myself a castings expert, I've seen plenty of casting flaws and I agree that's what those look like to me.
If that plenum were mine, I'm not sure I'd do much about those flaws/cracks. They certainly don't affect the operation of the FI unit.
If you’re not connected to a qualified TIG welder in Huntsville PM me.
Thanks Lotsacubes. Huntsville is an aerospace machinist's Mecca. There are plenty of top quality exotic metal welders, CNC machinists, etc.
But I will keep you in mind.
OK, here is everything that I have related to the three different Rochester FI systems that I have
1. A bare 1964-1965 plenum, with welded feet repairs.
2. A 1963 7375 unit with a polished manifold, nice air meter, nice plenum, nice lid, and a few assorted parts
3. A 1964 7380 unit complete (as best I can tell) with a 1111063 distributor and a 1957 vintage air cleaner
Here is a boatload of pictures of all of these systems.
Everything laid out 1964-1965 plenum with welded feet Welded feet More welded feet No tag on this plenum Bottom of this plenum 1963 7375 partial unit Including an NOS Venturi A very nice lid A polished plenum with the casting numbers removed And assorted parts Nozzle blocks for the 63 unit Air meter for the 63 unit Bottom of the 63 unit with the spider 1964 complete unit 1964 Fuel Meter 1964 Air Meter 1964 1111063 distributor and fuel line Distributor tag Assorted parts included the distributor spacer Nice 1964 manifold 1963 lid fins Underside of the 1964 unit Details of the underside More details of the underside Underside of air meter 1957 vintage air cleaner 1957 air cleaner Date code on the 1964 manifold bottom of lid from the 1964 unit bottom of lid from the 1963 unit flattened fins on the 64 lid Nice 1963 lid Back opening of the bare 1964 plenum Back opening of the 1963 plenum 1964 on the left, 1963 on the right 1964 has hole for PVC 1963 does not have a hole for PVC
My plan is to restore the complete 1964 unit (including welding / repairing the cracked plenum) and install it on the car. This will give me some experience with, and a better understanding of, the original Rochester systems.
The 1964-1965 plenum with welded feet repairs will be used for the Rochester EFI conversion, along with the polished 1963 manifold. I will also use the air meter parts (mostly for show).
Extra parts not needed (but not ready to let go of them yet)
1. 1963 7375 Plenum, in good condition with no damage or repairs
2. Assorted small parts (fuel filter clamp, fuel meter screws
Parts still needed
1. Fuel meter body and lid (just for looks, can be damaged and repaired)
2. The various fuel, vacuum, and vent tubes (just for show)
3. Choke housing and cover (just for show)
4. Throttle lever to adapt from carburetor to FI unit on car (needed for correct operation)
5. Throttle lever linkage and axle unit
I am sure there are more things that I haven't thought about yet.
The car heads to the shop this week for installation of a Vintage Air system, then I will start thinking about the original FI unit.
A little OT but does anyone know the difference in cfm between a C1 and C2 FI? They certainly have the capacity for the air portion compared to the smaller C1 plenum.
64 FI Unit - 1st problem
