Firewall eyeball penetration dimension question

[Dean Pichon]

Would anyone know the hardware spacing for these firewall penetrations:



Thanks!

[Raymo]

They come with a small piece of paper that tells you how large to make the center hole and where to put the screw holes. The dimension for the center hole is wrong (too small) and it is best to just use the metal as a pattern, rather than the paper pattern.

That said, I do not recall the dimension in question but I can take a measurement this weekend.

[Dean Pichon]

Originally Posted by Raymo

That said, I do not recall the dimension in question but I can take a measurement this weekend.

Thanks! I'm fabricating a part to interface with this penetration, but don't have the part in hand.

[rzbill]

A tip.
These eyeballs do not create a gas tight seal by themselves. They need some goop to seal them up. If you want the goop on the engine side of the firewall, vs the cabin, make sure to point the eyeball face shown in the above image towards the cabin side.

[BillL]

Originally Posted by Dean Pichon

Would anyone know the hardware spacing for these firewall penetrations:



Thanks!

1.000 inches Square for the 4. 1.625" for the span of the two. 1.079" dia hole.

I made a test piece from aluminum first. Made it perfect, 063 and it became the drill guide.

[Dean Pichon]

Originally Posted by BillL

1.000 inches Square for the 4. 1.625" for the span of the two. 1.079" dia hole.

I made a test piece from aluminum first. Made it perfect, 063 and it became the drill guide.

Bill,

Thanks so much! This is just what I need.

Regards,