Need 63-64 FI plenum and runner dimensions

[Duke W.]

I want to set up some computer simulation models for the FI system and need some dimension data:

1. Length of runner measured along flow centerline

2. Runner cross section dimensions - measure them at the starting point inside the plenum.

3. Plenum volume - interior length X interior width X interior average height (including the cover) minus two times the length X width X height of the volume consumed by the two runner quads.

Doesn't need to be done with a micrometer - just a good tape measure that you can pic off within about a 16th or a 32nd. Metric to nearest mm is okay, too.

If anyone has a plenum laying around with the cover off can you give me a hand?

Duke

[Michael H.]

Re: Need 63-64 FI plenum and runner dimensions

Duke, I don't have an FI plenum handy but I think that trying to measure the lower area inside is going to be a bit difficult using measuring instruments, especially in the areas where the angle of the floor changes. Would it be possible, and a lot more accurate, to use liquid for the area below the tops of the intake runners? If a calculated amount of liquid is added to the point of just touching, but not spilling over the tops of the runners, it would give you the exact volume to that point. That amount, in fl oz or CC's, could then be converted to cubic inches. Then, the area above the top of the runners would be easy to calculate manually because the dimensions are consistant without irregular areas. The top cover would also be difficult to measure mechanically as the top or roof is on an angle but it too could be measured using the fluid method. It's a lot of work but I think that it would provide a fairly accurate total volume when all the figures are added together. Should be an interesting number. I'd be interested in knowing what you come up with.

[Duke W.]

Re: Need 63-64 FI plenum and runner dimensions

I only need a reasonable approximation of the plenum volume. This can be done
just by measuring the length, width and average interior height of the
plenum, then subracting the volume of the two runner quads that can
be approximated by two tetrahedrons.

Duke

[Duke W.]

PS

I also need the diameter of the air meter throttle bore outlet - below the throttle valve. I think it's 3", but am not sure.

Duke

[G B.]

Re: Need 63-64 FI plenum and runner dimensions

Duke -

I can't reach your requested accuracy (within 1/16") when taking measurements. I'll loan you a plenum and lid, however, and you can do it yourself.

Are you willing to pay for the UPS shipping involved? It would probably cost about $20 each way.

[Paul Vanderpot]

Re: Need 63-64 FI plenum and runner dimensions

Duke,
Do you go to the Crystal Cove "show" Saturday mornings?
If so, I will bring a '64 380 unit and you can take the measurements.
If not, I will take the measurements for you this weekend.
Paul

[Duke W.]

Re: Need 63-64 FI plenum and runner dimensions

Jerry - I don't know if I can tape any better than you. If you can pick
off the runner cross section dimensions by reading the tape to the hearest
1/16", that's no better than I can do. Runner length to a quarter inch is
okay.

As far as plenum volume is concerned, it doesn't have to be down to the CC,
If I can get within 20 percent of actual that would probably be okay -
interior length, width, and average height minus a reasonable estimate
for the runner quads that extend up above the base.

Between what you can Paul can come up with, I'll probably have a reasonable estimate.

Duke

[Duke W.]

Re: Need 63-64 FI plenum and runner dimensions

Is that the Saturday morning cruise-in south of Newport Beach off Highway 1? I was down there two
weeks ago with (2/7) the Cosworth Vega - parked next to a friend's white '70 911S a couple of spots over from the Grand Sport replica. Lot's of neat hardware, but
not many Corvettes - a couple of solid axles and a nice '67 L-36
arrived about 0900 when people were starting to leave. Were you there?

Don't plan on going down there this weekend. It's a pretty long haul from Redondo Beach, and I don't like getting up at 0500 - looks like it might rain, anyway, so if you can take some measurements, I'd appreciate it.

Duke

[Roger Legge]

Re: Need 63-64 FI plenum and runner dimensions

Might it be possible to measure plenum volume in a similar way to CC'ing a cylinder head, via a liquid? Seal surfaces to the point where measured liquid can be used to fill the plenum?

Roger
#36316

[Michael H.]

Re: Need 63-64 FI plenum and runner dimensions

Now, there's an idea.

[Duke W.]

Re: Need 63-64 FI plenum and runner dimensions

This has already been asked and answered earlier in the thread. I only need a reasonable estimate of plenum volume. Computed volume from taping the relevant dimensions should provide the necessary accuracy.

Duke

[Mike M.]

Re: Need 63-64 FI plenum and runner dimensions

Duke: why not just cc the plenum like you'd do a cylinder to determine comp ratio? i have an empty plenum, could lay it on a piece of glass after greasing the plenum to base plate mating surfaces with wheel bearing grease then just fill the the runners with water via a graduated cylinder or pipette. let me know. mike

[Duke W.]

Re: Need 63-64 FI plenum and runner dimensions

Don't need that degree of accuracy, but if you can tape the dimensions
I mentioned, I'd appreciate it.

Duke