I get it, Danny, but why not? It's a way to pump (and pull*) modestly heated air into the place where the fan will suck it in. Probably not as good as stock but maybe better than doing nothing?

Cardboard tells me it could work as planned, mechanically speaking. Whether it would make any difference to the engine, good or bad, is another matter.

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*my theory is the flap, pulled just beyond horizontal, will cause the fan air to Bernoulli the rising, exhaust tube-heated air up and into the engine bay as well, effectively (or not-very effectively?) transforming the 3-4 exhaust pipes into a cheap and cheesy heat exchanger. 

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edsnova posted:

I get it, Danny, but why not? It's a way to pump (and pull*) modestly heated air into the place where the fan will suck it in. Probably not as good as stock but maybe better than doing nothing?

*my theory is the flap, pulled just beyond horizontal, will cause the fan air to Bernoulli the rising, exhaust tube-heated air up and into the engine bay as well, effectively (or not-very effectively?) transforming the 3-4 exhaust pipes into a cheap and cheesy heat exchanger. 

I'm not seeing how the air would be even modestly heated when the engine is cold.

If the engine is cold enough for any of this to matter, it'll be cold enough for the oil to be bypassing the cooler. The cooler won't have hot oil circulating through it, so the air would be pretty much the same temperature coming out as it was going in.

As for the Bernoulli effect on the exhaust, I suppose that's possible, but I would also suppose the effect to be really, really minimal.

I'm wondering (in a Spyder, especially) why any of this matters. If you are operating the car, it's warm outside. If it's warm outside, and the engine is even modestly hopped up, it'll make more than enough heat eventually. If you are trying to prolong the life of an engine that will certainly see less than 4000 mi/yr of action, then you are worrying that the engine might need to be rebuilt in 2040 instead of 2045 (and that is being generous).

If you want to do it because you want to do it-- then I completely understand that.

Carry on.

Well, Stan, 30 seconds after startup those headers are waaay too hot to touch. Hot air wants to rise. But...

You guys are right: It's a bridge too far and at least a misdemeanor violation of the KISS principle. It's long past time I wrapped this project up. I'll just duct it down and out and let the N.O. worry about not having thermostatic control during warm-up. 

Thanks for your kind and experience-inflected advice. 

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