Lotus Europa Forums > Garage
Twin cam carburettor cross over pipes plus other noob questions.
berni29:
Hi BDA
Very interesting, so if the car was optioned with headers, and fitted at the dealership I would think, then the crossover pipes would have been binned at that point.
Thank you
Berni
Pfreen:
BDA.
Are you saying the dealer removed the crossover pipes? If so, they are lucky they were not caught since that is very illegal.
I have never heard before that headers were a factory option. That's interesting. I wonder what they looked like.
jbcollier:
Yes, all Federal TCs had the funky pipes fitted.
Nothing to do with carb icing. It's complicated system with an extra throttle plate to divert some of the mixture to the manifold hot spot. The amount of mix diverted depends on the throttle position. Most at idle, none wide open. Reduces the amount of unburned hydrocarbons at idle and low speeds.
They are removed as they reduce performance and drivability.
Originality nuts do refit them. Some people fit the pipes but alter things internally so they are disabled.
BDA:
I bought my car from the Lotus distributor in New Orleans and they did indeed delete the crossover pipes for me. I guess it was technically illegal but I don’t think there were any checks for emission equipment there then. My memory is a bit foggy but I think they commonly did that for the Europas they sold.
Check out this page of the Europa TC parts manual for the Lotus headers: http://lotus-europa.com/manuals/tcparts/s/tcsa.pdf
Ironically, I don’t remember seeing any Europas with headers or any mention of them at the Lotus distributor when I used to hang around there. They did have a few Vegantune motors lying around presumably for sale.
Bryan Boyle:
--- Quote from: BDA on Wednesday,March 27, 2024, 08:09:03 AM ---
***deletia***
Check out this page of the Europa TC parts manual for the Lotus headers: http://lotus-europa.com/manuals/tcparts/s/tcsa.pdf
Ironically, I don’t remember seeing any Europas with headers or any mention of them at the Lotus distributor when I used to hang around there. They did have a few Vegantune motors lying around presumably for sale.
--- End quote ---
I think that the native and ROW cars used the 2-piece header assembly that is in the parts manual, it was only because of our emissions regs that they went with the cast header to allow the cross-over piping to be installed. In theory, they probably could have gotten it to work...but most of the cars that I've seen with the crossovers have them just for 'show' and the functionality has been deleted. I can't use them (unless just as decoration); I modified the secondary body by removing the butterflies and plugging the preheat circuits, butterfly shaft openings and leaving the balance tube in place. Which reminds me...I should put a heatproof gasket in under the plate to seal the out-and-back just as a precaution...;) It could be a source of air leaks...;)
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