Show whole topic
Jan 28, 2008 6:22 pm
Jan 28, 2008 6:22 pm
Subject: Re: 2L engine problem
All very well, but none of you have offered a real explanation for the petrol spit-back problem. And if I myself, after much thought, come up with the very plausible answer that it might be the combination of downdraft carburetter/valve overlap/camshaft profile, all I get from one of you is: "I would be surprised if, on its own, changing the cam profile would solve this problem". I already knew that and it is not what I said.
The fact that we all agree on the merits of the downdraft head is not the issue. What we are discussing and concerns us now is applying this cylinder head the correct way, with the right camshafts, valve overlap etc. and getting the most out of it without creating a modern mongrel. I have tried to help those who have the same problems (H45 John). And to be honest, with all respect for Arnold, he doesn't "set it out clearly" at all; actually he hardly mentions it in his new book. He only claims that none were produced at the time and that the picture is a mock-up. However, I myself know the location of an original 1930 Lagonda downdraft cylinder head.
Anyway, Colin - I'd love to have your answers to my qustions above.
All very well, but none of you have offered a real explanation for the petrol spit-back problem. And if I myself, after much thought, come up with the very plausible answer that it might be the combination of downdraft carburetter/valve overlap/camshaft profile, all I get from one of you is: "I would be surprised if, on its own, changing the cam profile would solve this problem". I already knew that and it is not what I said.
The fact that we all agree on the merits of the downdraft head is not the issue. What we are discussing and concerns us now is applying this cylinder head the correct way, with the right camshafts, valve overlap etc. and getting the most out of it without creating a modern mongrel. I have tried to help those who have the same problems (H45 John). And to be honest, with all respect for Arnold, he doesn't "set it out clearly" at all; actually he hardly mentions it in his new book. He only claims that none were produced at the time and that the picture is a mock-up. However, I myself know the location of an original 1930 Lagonda downdraft cylinder head.
Anyway, Colin - I'd love to have your answers to my qustions above.