Floorboard <==> Exhaust Pipe clearance and its effect on radiant cockpit heat

[Mark E.]

Re: Floorboard &lt;==&gt; Exhaust Pipe clearance and its effect on radiant cockpit heat

Thanks Terry! I got your sheet A4; I'll print and add to my AIM.

[Patrick H.]

Re: Floorboard &lt;==&gt; Exhaust Pipe clearance and its effect on radiant cockpit heat

All I can tell you is the drawing shows the pipes flattened much farther forward than they were in practice. The OEM 2-inch pipes are hardly flattened at all. I can't defend the drawing. It is what it is.

As you well know what is shown in the drawing often has only a passing resemblance to what the part or installation looked like in real life. Note the mufflers are a separate piece from the middle exhaust pipes in that drawing, and have joints in the usual service replacement location.

Thinking that the AIM drawings are exact with regard to part appearance is folly.

[Terry M.]

Re: Floorboard &lt;==&gt; Exhaust Pipe clearance and its effect on radiant cockpit heat

As you well know what is shown in the drawing often has only a passing resemblance to what the part or installation looked like in real life. Note the mufflers are a separate piece from the middle exhaust pipes in that drawing, and have joints in the usual service replacement location.

Thinking that the AIM drawings are exact with regard to part appearance is folly.

Sharp observation about the mufflers looking seperate. I hadn't noticed that.

I looked at the UPC8 Sheet A4 from 1971 and 1972 this morning and they remain substantially the same. 1971 adds a note about the clearance below the differential that is removed for 1972, but all the rest of the dimensions and notes are the same for all three years. 1972 has a A5 sheet with more information about the tip and bezel, but there is nothing to address your question Mark.

[Mark E.]

Re: Floorboard &lt;==&gt; Exhaust Pipe clearance and its effect on radiant cockpit heat

Thanks for the help, guys.

Under the seats, the floorboard area closest to the tunnel is a fraction of an inch higher than the area more outboard from the tunnel. The transition between these higher and lower horizontal areas is angled at about 45 deg.

Is the purpose of this recessed section of floorboard near the tunnel to provide more space for the exhaust pipes?

It's not clear from the detailed views, but could the dimensions for exhaust clearance be given at 45/50 deg because it's measured along the 45 deg transition?

And I don't see a specified clearance between the horizontal floor and the top of the exhaust pipes. Am I missing that?

[Mark E.]

Re: Floorboard &lt;==&gt; Exhaust Pipe clearance and its effect on radiant cockpit heat

I'd still like to know the proper minimum vertical clearance between the top of the exhaust pipe and the floorboard in the area under the seats. That's not specified in AIM.

Would anyone with an original (if those still exist) or reproduction 1968 - '74 2 1/2"exhaust be willing to share?

[Terry M.]

Re: Floorboard &lt;==&gt; Exhaust Pipe clearance and its effect on radiant cockpit heat

I'd still like to know the proper minimum vertical clearance between the top of the exhaust pipe and the floorboard in the area under the seats. That's not specified in AIM.

Would anyone with an original (if those still exist) or reproduction 1968 - '74 2 1/2"exhaust be willing to share?

I may be able to check in a few days.
After I thought about this some, I am pretty sure nothing of that sort is in the AIM because the exhaust pipes were installed in the chassis before the body was any place around so no such measurement was possible until long after the exhaust system was in place,

[Mark E.]

Re: Floorboard &lt;==&gt; Exhaust Pipe clearance and its effect on radiant cockpit heat

Good point, Terry.

But those funky 45/50 deg exhaust-to-floor clearances are specified in AIM. Maybe it was a post-body drop check that was done. I wish it was clear how those specs were measured.

Anybody know?

[Douglas L.]

Re: Floorboard &lt;==&gt; Exhaust Pipe clearance and its effect on radiant cockpit heat

Just ran out and measured my 68 with a Gardner exhaust. Clearance is around 1"-1.25".

[Mark E.]

Re: Floorboard &lt;==&gt; Exhaust Pipe clearance and its effect on radiant cockpit heat

Just ran out and measured my 68 with a Gardner exhaust. Clearance is around 1"-1.25".

Thanks Douglas! Is that with 2 1/2" pipes?

[Douglas L.]

Re: Floorboard &lt;==&gt; Exhaust Pipe clearance and its effect on radiant cockpit heat

Yes, 2-1/2 pipes.