Plenum questions

[VetteMed]

I picked up a spare plenum many months ago, and haven't really looked at until today. It is identical to the plenum in my '91, with the exception of 2 holes - one on each underside of the runner pairs, for the 2 passenger side rearmost cylinders. It is smooth, about 3/8" diameter. Any idea what this might have been for? Also, how far up do the "walls" between the runners normally go, from the mating surface for the injector housings?

[Jeffvette]

Pictures?

Runner wall goes up maybe 1.5" into the port.

[VetteMed]

Pics:

http://i680.photobucket.com/albums/vv163/agchoset/IMG_2196.jpg

http://i680.photobucket.com/albums/vv163/agchoset/IMG_2195.jpg

http://i680.photobucket.com/albums/vv163/agchoset/IMG_2197.jpg

http://i680.photobucket.com/albums/vv163/agchoset/IMG_2198.jpg

[GOLDCYLON]

Pre production test Plenum?

[Jeffvette]

Extremely raw casting, as the mating surfaces have not been machined. I would not figure those to be casting holes, but they are unfinished. A drill would have left a nice smooth surface.

[tccrab]

Seems to have imperfections on the bottom left side.
Might just be shadows, but kinda looks like a dent above the A and another just to the left of the 4.
My guess would be that it's a prototype with holes for special sensors (can't imagine why) or a failed casting that didn't get thrown away.

The holes are too far up the runners for "NOS" nozzles, but it would be a cool way to hide 'em away from prying eyes...

TomC
'Crabs

[A26B]

I think its a used plenum that has had the crap sand-blasted out of it. A raw casting wouldn't make the coolant & vacuum tubes look like that too.

[Pete]

I think its a used plenum that has had the crap sand-blasted out of it. A raw casting wouldn't make the coolant & vacuum tubes look like that too.


Exactly what i was thinking and they blew thru those little round castings.

No biggie,just weld them up.

Pete

[Jeffvette]

Those castings plugs are not that close to the radius bend going to the main body.

[Pete]

Those castings plugs are not that close to the radius bend going to the main body.


Could be drilled out for a "Sneaky Pete" Nitrous Kit :-D

Pete

[Jeffvette]

Could be drilled out for a "Sneaky Pete" Nitrous Kit :-D

Pete


Doot de doot? Or however the hell you spell it?

[VetteMed]

THis was not a raw casting - there's a few traces of paint - so at one time it was probably completely painted/powdercoated.

[Jagdpanzer]

Left to long in a caustic soda hot cleaning tank?

[-=Jeff=-]

Doot de doot? Or however the hell you spell it?

:sign10: :sign10:

[flyin ryan]

Somebody started to drill for 'Fogger' nozzles, I'm guessing. Only thing that makes sense.

[billybaloneey]

Pics:







http://i680.photobucket.com/albums/vv163/agchoset/IMG_2198.jpg

Re: Plenum questions
Somebody started to drill for 'Fogger' nozzles, I'm guessing. Only thing that makes sense.
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That hole looks like it was cast...not drilled.

[VetteMed]

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That hole looks like it was cast...not drilled.

That's what I thought. :dontknow:

[bdw18_123]

That hole looks like it was cast...not drilled.

Or it was drilled first, and then had the crap sandblasted out of it which made it look like a cast hole.