Before you do anything irreversible, please know that on our 1966
Sprite, we have a single exhaust pipe coming out about that same
distance. It looks a little goofy because we have no rear bumper, but
it is that long. And no fumes come in to the car with the top off. Our
1969 Sprite, that we used to have, looked just like yours, with the twin
pipes and the bumper, and we had the same problem you do with fumes. I
never solved it.
Is it possible that the bumper causes some undesirable turbulence?
Robert wrote:
> Hi Bob,
>
> I've been over the system and all possible entry points through the
> firewall and everything is sealed. I have a new fresh air hose, etc..
> I think I'm having the problem you're describing below of return flow.
>
> I just went out and took two quick photos of back of the car and the
> exhaust:
>
> http://www.woozy.com/midget/images/exhaust_01.jpg
>
> http://www.woozy.com/midget/images/exhaust_02.jpg
>
> It looks like it is a good deal further back than what you ended up
> with. Hopefully shortening the exhaust pipe and moving it forward will
> do the trick.
>
> Thanks,
>
> Robert
>
>
> Robert E. Shlafer wrote:
>
>> Hi, Bob.....
>>
>> first of all, be sure there are no leaks anywhere in the system, of
>> course.
>>
>> There is a certain low pressure area behind
>> the car which will "return" air flow. You've
>> probably noticed this when you drive top down in a shower....the
>> inside of the windshield gets wet! You can actually
>> see "return flow" in terms of water droplets
>> coming off the trunk towards the cockpit.
>>
>> I had this problem with my BE using an MGB ANSA rear section with
>> double outlets.
>>
>> We shortened the exhaust pipe by a couple
>> of inches as we fettled with different exhaust hangers, etc. to
>> reduce chrome pipe length beyond the rear body to no more than 2" and
>> brought the end chrome
>> pipes vertically closer to the body.
>>
>> Solved the problem though I occasionally
>> have to use gasoline to remove exhaust
>> system staining (minor annoyance) from the
>> left rear bumperette however.....
>>
>> no more "reverse flow" of exhaust gases into the cockpit. Life is
>> good! :)
>>
>> Cap'n. Bob '60 :{)
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