|
|
Posted by clueless [201.202.24.94] on Tuesday, December 27, 2011 at 22:57:24 :
In Reply to: is this possible posted by clueless [201.202.24.94] on Tuesday, December 27, 2011 at 22:30:40 :
Posts Coming Out in Encyclopedia Form Soon
Active Member
12,926 posts
Posted November 2, 2009 at 10:46 pm
There was this misconception back in the days that thought intake and exhaust size didn't matter, but like now, size does matter . Between the valves being close in size, that intake increase could be equivalent to an easy 98hp engine becoming 140hp or more, and that's a good thing. My idea is to basically switch the intake and exhaust shaped ports, so the exhaust are merged together and the intakes are individuals. Will talk more later, gotta do something else, but will look into this some more.
As it turns out, the intake and exhaust are larger in the DeSoto than the Dodge or Plymouth. As as matter of fact, the intakes are the same as the exhaust valves, so save those DeSoto valves, they fit in the Plymouth/Dodge block (that's the good news).
I wonder if you could find a company that can cut a new camshaft. My main idea that would make this all the easiest would be to cut the intake and exhaust lobes opposite location they are in. In other words, each intake becomes an exhaust and each exhaust becomes an intake. The lobes switched accordingly, to which it could be done, then you are talking (this is the cool part). Since the DeSoto intakes are much larger than the D/P intakes, but the DeSoto exhausts are the same size as the D/P intakes, simply bore the exhaust ports to the new DeSoto intakes, which are about two tenths of an inch larger! Then, a nice three port header, MPFI on all six cylinders, a cautious shave of the head to improve the compression a little, possibly having to relieve the intake (ex exhaust opening) in the head to clear this new larger valve where a much smaller valve was, and you are looking at a very unique and much more reliable engine, just blow the competition away with it as a matter of fact. The camshaft recut would be the best part, and there are old flathead cam cutters out there, saw them when I found the intake manifold pictures I needed to understand what was going on.
Do you have an aluminum head you might be able to do a little filling on to raise the compression a little bit? That might be a fun addition on top of all this stuff so far. Need to see if you can attach a couple pictures of the piston top/valve pocket, and if you do tear apart the DeSoto, do a few extra measurements to ensure what I am talking about this time is correct, and then find that flathead cam cutting guy for a radically calm cam and EFI!!!
Edited by dana44, November 3, 2009 at 12:09 am.