Quote:
Originally Posted by stillsearching
The question is whether better mileage is possible lugging at 1400rpm with more torque, or whether spinning 2500rpm with high compression more efficiently. I consider it something "not closed" until better researched, and since I don't even know where to find such cams, and they seem to have been rare enough that only a few people even remember or ever had one...
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You need to talk to Dema Elgin at Elgin cams.
http://www.elgincams.com/index.html
There's nothing magic about fast ramp, short duration, camshafts. He has ground some special cams for my race engines, and found my Geo Xfi cam interesting. He has a lot of engine knowledge, teaches classes on the subject (I've taken his 2-day seminar in 2011), he's been an invited speaker at PRI and SEMA. Not much of a website, but he's an old guy who puts his effort into working with customers one at a time, and less on internet marketing hype. I've spend many hour with the man, Dema is the
real deal
There are several software packages out there that allow the curious to ask 'what if' without building that exact engine, that come pretty close to reality. Engine Analyzer Pro is one I've used (cost around $250 I think, a friend owns a copy) Oh, there are some bargin packages out there for $39.95 but those are way too general for 'out of the box' designs, and not worth your time. Be warned, if you have that deep-rooted gearhead gene in your DNA, you'll spend days fooling around with a good program. There are limitations, though, it's only as good as the data you enter. You should flow the head at various lifts, and build a library of cam profiles from which to select.