Quote:
Originally Posted by RoughSilver92
A recent discussion left me wondering if David Vizard, a brilliant man with a long history of making power and teaching others how, had released any information regarding 4 valve engines. Most of his writings pertain to old Detroit iron (v8's), but being the genius he is, he has a great knowledge of 4v engines as well. Now I'll let his writings speak for themselves:
http://www.gofastnews.com/board/tech...r-concept.html
I wonder if this technology can be used by some of those looking to go all out with the EG33. For example, is there enough room in there to utilize valves of different sizes. I assume there is no way to reduce the valve size, so the only way to use different size valves is to go larger? Also, do our ports and combustion chambers lend themselves to the type of modifications necessary to support the "swirl". And I would think that the exhaust valve position in the chamber is kind of stuck where it is. Seems like it would be difficult to recess that any. Is this something that someone with unlimited resources would be able to accomplish on stock heads, or would it require brand new heads (which I don't think we'll be seeing)? |
I have heard of this work before, it is designed to get around the way the inlet ports flow air across the combustion chamber roof and out the exhaust valves, during the overlap period. His work is interesting, and I follow it with interest.
The older two valve chambers had the inlet port angled so that the inlet flow was directed away from the exhaust valve, to spiral down the cylinder.
The question is, why increase the overlap. We have 4 valve 800cc engines reving to 19000 rpm delivering 230 HP, that rely on the sonic system to induct the air.
Harvey.