Lotus Elan

Exhaust fume question

PostPost by: JerryBoone » Tue Jun 25, 2024 1:53 am

I don't own a coupe, but I have a friend who does. I also have a friend who is an aerodynamic expert. I asked the expert to look at photos of a coupe to see if he could recommend any modifications that might reduce the ingress of exhaust fumes. One of the questions he asked is if the problem exists in the pre-airflow design. He also asks if the airflow vents can be closed or if they are always open.

Thanks for a thoughtful response.

-- boone
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PostPost by: nmauduit » Tue Jun 25, 2024 8:48 am

I would bet that most if not all of the fumes could be kept outside with a leak free exhaust system and a properly sealed tunnel and trunk.

I own an S4 FHC which smoked quite a bit during the initial phase of tuning, which ended up lasting quite a while (long story) and I don't think the smell was coming from the side openings.
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PostPost by: gjz30075 » Tue Jun 25, 2024 8:55 am

When I owned a pre airflow coupe, there were no exhaust fumes in the cabin. This is even with a
boot gasket that probably was as old as the car.
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PostPost by: rgh0 » Tue Jun 25, 2024 9:42 am

The exhaust needs to come about 75mm past the rear bumper. I would check that first. Second i would check the bootv seal. Third the rest of the cabin and exhaust system for leaks.

cheers
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PostPost by: JerryBoone » Tue Jun 25, 2024 11:30 am

I neglected to include that the issue with fumes exists only with the windows down.

Thanks again
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PostPost by: Ray419G » Tue Jun 25, 2024 12:00 pm

I have been driving an Elan fixed head coupe with airflow for many years and haven't had any issues with exhaust fumes entering the car. I can only agree with all the previous responses to this query - the problem is most likely to be caused by a specific fault or faults on the car in question, rather than something that's generic to the design of the Elan or its ventilation system.

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PostPost by: Sinbad » Tue Jun 25, 2024 8:12 pm

I drive an airflow S3 FHC and I traced a cabin exhaust fume Ingres I had to a split gear lever gaiter. Replaced and problem solved.
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