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Jan 27, 2008 10:44 am
Jan 27, 2008 10:44 am
Subject: Re: 2L engine problem
Well, the engine is now being rebuilt and we'll see if these new camshafts will solve the problem. Everyone who is working on it says it will. I too believe it is the logical answer. In the 1930's, flat-lobed camshafts would not have been a problem with side draft carburetters and the standard valve overlap for the 2 Litre engines being only 9 degrees. However, I'll keep the Forum posted. Meanwhile, here is a picture of the two types of camshafts - with flat and rounded lobes.
Personally, apart from the spit-back problem, I find much valve overlap and high engine revving on a long stroke Lagonda 2L when it is only used on the road quite unnecessary and it is not good for the engine. Also it makes the car less original and increases petrol consumption. I seldom rev my engine as high as 3500 and the car very nicely keeps up with modern traffic. At 3100 revs in forth gear (wonderful relaxed cruising) it does just over 70 MPH - quite fast enough for me! (And indeed the law).
If one races the car it's a different matter and these modifications make sense. Besides, everybody has his own idea how to use or alter his car - I respect that.
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Well, the engine is now being rebuilt and we'll see if these new camshafts will solve the problem. Everyone who is working on it says it will. I too believe it is the logical answer. In the 1930's, flat-lobed camshafts would not have been a problem with side draft carburetters and the standard valve overlap for the 2 Litre engines being only 9 degrees. However, I'll keep the Forum posted. Meanwhile, here is a picture of the two types of camshafts - with flat and rounded lobes.
Personally, apart from the spit-back problem, I find much valve overlap and high engine revving on a long stroke Lagonda 2L when it is only used on the road quite unnecessary and it is not good for the engine. Also it makes the car less original and increases petrol consumption. I seldom rev my engine as high as 3500 and the car very nicely keeps up with modern traffic. At 3100 revs in forth gear (wonderful relaxed cruising) it does just over 70 MPH - quite fast enough for me! (And indeed the law).
If one races the car it's a different matter and these modifications make sense. Besides, everybody has his own idea how to use or alter his car - I respect that.
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