If you've decided to eliminate your heat exchangers or install a sport exhaust where the exchangers need to be replaced, you'll end up with a loss of cooling air outlet.
There's a sort of chute under the cylinders that drains used cooling air, preventing it from being trapped under the engine, all to allow heated cooling air to be exhausted as far as possible.
Heat exchangers largely close off the cooling air duct to the outside, but if heat exchangers aren't present, there's too much space.if heat exchangers are not present, the space is too large and cooling air is partially exhausted to the side instead of being forced backwards. What's more, the exchanger replacements are much hotter than the original heating exchangers, which means even more hot air gets trapped. Another solution will have to be found, for which the guide plate mentioned here is used, it seals the gap.
Volkswagen has also encountered this problem with VW Thing models fitted with auxiliary heating. They were not fitted in the first production runs, but only from 3.1973 onwards, and then only on 1600c engines with engine code AL, which were equipped with auxiliary heating and therefore had no heat exchangers.
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