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A few weeks ago I replaced the shifter rod bushing in my Vintage Speedster and noticed the inspection plate covering the front of the tunnel opening was missing or never installed.  I thought Bingo, this is probably why I always felt a good amount of airflow coming from the emergency brake boot (though the driver's side slit for the heater lever) when driving the car on the highway.

So I sourced used original inspection plate ($3) and installed it with the gasket when I completed my shifter rod bushing replacement.  I thought great, now on those cold days I just removed a source of cold air entering the cabin to make the anemic heating system better.

Wrong, driving the car today I felt the same airflow coming from the emergency brake boot as before.  Installing the tunnel inspection cover made no difference!

Are there other sources where air can pretty freely enter the pan tunnel to cause such airflow.  I have Goggled and looked at the pan and cannot see any obvious entry points.

If this is not normal, I would like to try to correct it, and any input would be greatly appreciated.

Thank you, Grant

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Thank you Gordon:

So while I may have tackled one source at the front of the pan, these other ones may be providing a source of air into the tunnel from the rear of the pan.  If Kirk didn't bother to install the tunnel front inspection cover, odds are that any other source will likely be open game.

Any idea where I could purchase the boots for these other connection point if they are indeed absent ?

Thank you, Grant

Yeah, CIP1, SoCal Imports, CB Performance - they all have them.  They are a PITA to install after-the-fact because you have to release the throttle and clutch cables at the engine and then fit the boots down the cables to the chassis, but once done, Voilá!  Much less air infiltration. (notice I didn't say 'no more'?)

IIRC, there is a boot for the clutch/Throttle and maybe another for the heater cables, but I don't know if you have a swing-arm chassis or an IRS one - the different years require different boots.  You could also check Bugcity.com for the year pan that you have - they  should have OEM German ones in stock.

Good luck, and post if you have questions.

GTman posted:

Thank you Gordon:

So while I may have tackled one source at the front of the pan, these other ones may be providing a source of air into the tunnel from the rear of the pan.  If Kirk didn't bother to install the tunnel front inspection cover, odds are that any other source will likely be open game.

Any idea where I could purchase the boots for these other connection point if they are indeed absent ?

Thank you, Grant

I'd take it back over to Kirk and have him do it. You're not too far from him.

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