Lotus Europa Community
Lotus Europa Forums => Garage => Topic started by: Lyngeled on Monday,March 18, 2019, 11:33:31 PM
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Hello
I have 2 dcoe 45s and was searching after what people was talking about of this sound weber have. I did not notice any impressive sound. Now I've found a YouTube video which I think is comparable to my engine: https://youtu.be/-EIrl4-tTDo. The sound of my engine is no as distinctive as these. I was thinking that there is a problem with the the adjustment of valves and timing. Maybe if these are very wrong it could make the weber sound weak?
Regards Lars
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... It's not the most important thing with the engine. But it may be a another sign of the that the engine is not adjusted right.
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Are the carbs set up properly? Most engines run very rich at idle to compensate for cold start, a more lean engine does sound kind of “weak”. Get a lambda/ air fuel ratio sensor or find somebody who has one. That’s the easiest way to tell.
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The intake and exhaust sounds an engine makes depends on many things. I wouldn’t tune an engine to get a certain sound. Tune the engine to optimal settings and then the sounds are just what you get. So, start with checking that the valve clearances and valve timing are correct. Then do a compression test to see if there are internal issues. Next check the ignition timing and advance curve. Then, and only then, set up your carbs.
My former boss and I have Ducati singles. His is a 450 with a straight pipe. Mine is a 250 with a megaphone stuffed with fiberglas batting. His actually sounds pretty quiet and restrained. Mine barks and howls like a mad thing. The real difference is that he has a stock cam and I have a full race cam.
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My former boss and I have Ducati singles. His is a 450 with a straight pipe. Mine is a 250 with a megaphone stuffed with fiberglas batting. His actually sounds pretty quiet and restrained. Mine barks and howls like a mad thing. The real difference is that he has a stock cam and I have a full race cam.
And a cylinder with half the displacement.
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Like JB said there is more to the intake and exhaust note than webers. I had a mini with little intake ducting with and SU carb, it sounded pretty sweet. I think what happens more often with Webers as a performance upgrade people install higher flowing air filter set ups, more air in also means more sound waves out especially if they don't have any piping or air system to flow through. That is the weber sound I think people look for, unmuffled intake noise. You also get pulses off the back of the intake valve that will sound different with individual runners versus an intake that consolidates 4 or 2 ports into 1.