Correct Airbox for a '70E?

[tom1394racing]

I am restoring a numbers matching '70E Coupe and am trying to make everything "correct".

I know the airbox should be the metal version with the cold start tubes. However, I read recently that all early fuel injected metal airboxes had the letter "E" stamped on top like the one shown in the attached picture.

I have seen several early 2.0E and 2.2E engines with metal airboxes containing the cold start tubes but without the "E" stamped. I do not know if they were original to the engines.

Is version with the "E" stamped the only "correct" version for the 2.0E/S and early 2.2E/S engines?

[tom1394racing]

Can anyone verify that the airbox with the "E" stamping is the only correct type of airbox?

[Zedone]

I have a metal snorkel if you need it.
Cheers,

[304065]

Tom,

Never seen nor heard of that but Einspritzung sure does start with E.

Which brings up a good question. Weber-carbed Ts have accelerator pumps for cold-start. Would they have had the supplemental pisser in the air cleaner as well? Seems counterintuitive (but so does a 73S having a trombone).

Why differentiate T vs E vs S? It must be that the spacing between the inlets is different. We know that the outer tubes of the weber manifold curve inward, so that the spacing between venturis is smaller than that of the manifold. This suggests that if there was an aux cold start, the holes would be in a different place. . . hence stamp an "E" for the E and S models with Einspritzung.

All makes sense but wonder if it's true? A measurement of the hole spacing in the brass tubes for the pisser would be a good place to start.

[xpensivewino]

Tom,
I'm restoring my 69 E, and the air box definitely seems to be the original to the car, and is correct for MFI, but mine has no E stamped in it. My brother has a 70 E with original air box, I will check that this weekend if I can.

[DG58INNM]

The '69T airbox (weber) does not have the "pisser" rails, while the '69 E&S box does. The '70/'71 airbox (zenith) does have the "pisser" rails. The '69 MFI airbox can be distinguished from the '70/'71 because it has only an "L" for the oil breather connection. The 70/71 box has a "T" to provide a connection to the vapor recovery as well as the oil breather. If anyone needs a '69 MFI airbox, I have one I would sell.
Dave

[tom1394racing]

Wow...Very informative. Thanks for the replies and PM's. It looks like my airbox is correct as it has the "E" stamped and it also has the T fitting.

So what is the difference between the 70/71 MFI airbox and the 70/71 Zenith airbox other than the "E" stamping?

[xpensivewino]

Tom,
We checked my brothers 70 E with original air box, and it does indeed have the E in it. He also has had some 69's in the past and does not recall it being on any 69 air boxes, so it may have started in 70.

[M_deJong]

Wow...Very informative. Thanks for the replies and PM's. It looks like my airbox is correct as it has the "E" stamped and it also has the T fitting.

So what is the difference between the 70/71 MFI airbox and the 70/71 Zenith airbox other than the "E" stamping?

Maybe the calibration of the spray bar orifice is different between Zenith and MFI? MFI has a higher pressure fuel pump than carbs so it should spray differently. I believe Ed Mayo wrote that there was a recall to disable the Zenith spray bars due to fire danger.

[DG58INNM]

Just dug out 3 old airboxes tonight (for sale). One was from a '69 MFI car, another from a '71 carb car. I never paid much attention to it before, but the differences in the spray bar are quite apparent. The MFI has 3 tiny orifices, pinhole sized, on each side and oriented above each intake stack. The carb unit has a single nozzle-like opening at the end of each rail, not spraying into the carb openings but apparently just creating a general fuel mist inside the air box. No wonder they were fire hazards!


MFI and pinholes


Carbs and the mister nozzle