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ckissick's Avatar
 
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Mystery hole in floor pan

Just curious; what's the hole in the floor pan for? It's a '66 912, built in late '65. It's about 1.5" in diameter and right in front of the plate that holds the pedal cluster. It's the hole that has yellow showing through it, showing some rust damage. Not the hole for the master cylinder.

I did some research and found some pics of a few earlier 911 undersides, and none of them have this hole. The replacement piece from Restoration Design has a dimpled area in the same location, but no hole. The dimpled area with no hole suggests it's an optional thing. I'm planning on welding a plate over it, but want to make sure I don't need it when I re-assemble the car.


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Charlie
1966 912 Polo Red
1950 VW Bug
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Last edited by ckissick; 12-18-2020 at 04:36 PM..
Old 12-18-2020, 04:34 PM
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Rust, maybe trimmed at some point? Under the pedal cluster is a fine place for water to accumulate if it gets in the cockpit? Nothing like it on my '68 912.
Old 12-18-2020, 07:24 PM
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It was clearly cut with a circular bit. Perhaps to create an escape for water. But it's also a good way to let water in from below. I can't imagine what I would need it for, so it's getting closed up.
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Charlie
1966 912 Polo Red
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1983 VW Westfalia; 1989 VW Syncro Tristar Doka
Old 12-18-2020, 09:38 PM
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My 88 has a capped and sealed hole in the same spot (I think). Couldn't figure out why when I had the pedal box out.

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Old 12-19-2020, 05:04 AM
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Good original pan photos here:
FS: '73 911 Floor Pan Section


The hole in photo above would be on wrong side.

Was your car switched from right hand drive to left hand drive?

I have heard of one Targa owner cutting a drain hole in his floor pan so it would not fill up with water.

Perhaps this owner did the same to allow dripping brake fluid a path out?
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Last edited by kach22i; 12-19-2020 at 05:33 AM..
Old 12-19-2020, 05:27 AM
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A/c

Not sure if your M/Y had AC, but it looks like a drain location for the evaporator.

Gerry
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Old 12-19-2020, 06:05 AM
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Quote:
Originally Posted by kach22i View Post
Good original pan photos here:
FS: '73 911 Floor Pan Section


The hole in photo above would be on wrong side.

Was your car switched from right hand drive to left hand drive?

I have heard of one Targa owner cutting a drain hole in his floor pan so it would not fill up with water.

Perhaps this owner did the same to allow dripping brake fluid a path out?
My pan has the same hole on the passenger side. I don't know what that's for, either. The hole I refer to is at the location of the circular offset area just in front of the bracket for the pedal cluster. In my car, it's been cut out.

My car never had air conditioning.

My car was originally a Swiss car, left hand drive.
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Charlie
1966 912 Polo Red
1950 VW Bug
1983 VW Westfalia; 1989 VW Syncro Tristar Doka
Old 12-19-2020, 07:32 AM
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my 76 911 has same punched out section on both sides however it is only open along part of it. Assume is to allow water out or act as a 'breather'? Mine looks factory.
Old 12-19-2020, 08:19 AM
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On early cars... that is where the master cylinder bolts too..
Old 12-19-2020, 09:00 AM
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Quote:
Originally Posted by 991gts6s View Post
On early cars... that is where the master cylinder bolts too..
That's not what I was asking about. It's the hole that's facing straight down behind the master cylinder hole.
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Charlie
1966 912 Polo Red
1950 VW Bug
1983 VW Westfalia; 1989 VW Syncro Tristar Doka
Old 12-19-2020, 04:40 PM
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911 floor pan tooling really never changed much over the years. This whole or dimple could have been related to the Webasto gas heaters found on some 65 - 68 911s. Again, with the pan design not changing much.

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Old 12-21-2020, 12:05 PM
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