Originally Posted by
maxflo777
EXACTLLY!!!
Common maximus
aples to aples dude! reading...
? a stock Ford 5.0 flows nothing, but there are enough aftermaket heads for that engine that flow close to 400 cfm. A ported modern Hemi head flows around that too. And max flow is just one part of the equation! the speed that the poppet valve design allows the valve to open, and after it
stays fully opened for a while, close, will never be attained with - at least - that design, it's just phisically imposible. It's area under the curve what gives you power. That head flows 319cfm for a degree or two, and is the other 90 deg or whatever following a linear curve from 0cfm to 319 and back to 0, not the case at all for apoppet valve, you can use the first 10~15 deg to raise it to the max for full flow, be there for ~60 deg and bring it down to 0 in the last 15 again and sudenlly the head flowed an average that is huge compared to the rotax head.
LOL, almost all modern stock heads do about 315cfm with good porting.
that type of head can ONLY do maximun flow at precisely the cam position that the valve is fully opened, lets give it 5 degrees for example if you make the hole bigger than the port, a poppet valve can be opened at maximum for whatever degrees you want - it not linear!!! And you cant do the holetoo big because it takes degrees to do it because of its linearity, not the casewith poppet valves.
AND again, I'm not saying is imposible, I'm just saying that as long as the valve opens with a linear relation to the crankshaft/camshaft position, the poppet valve will have a chance to shine if done correctly.
But as the wingman said, the big dogs would be using it if it where that good, at least when full blown racing is what you want.
X
With a conventional poppet valve, it can take 34 degrees of crankshaft rotation or more to reach a fully open position, wasting energy and limiting volumetric efficiency. With the CSRV, a comparable port area is exposed in only 2 degrees of crank rotation. The CSRV allows for superior surface flow coefficients from its spherical shape
remeber they made that HP on a bone stock Ford 5.0 from a lincoln.. this is not a race built engine at all, no headers, no high compresion pistons, just a stock motor with this intake technology....Good luck reaching that level of power bolting on just a set of aftermarket heads onto a stock 5.0..
I am unsure where this technology is headed, Coates holds all the patents on it and likely wants some huge money to allow any of the big guns to use it..... I myself wouldn't so quick to write it off, as you have to remeber the testing was done with first prototype heads, not with heads that were developed for racing.... being able to almost double the engines power output and nearly triple its RPM range is nothing to sneeze at..especially considering they are a first generation test head...with proper development this system would by far exceed what they currently are doing...You shouldn't be so quick to write off new technology, as you really don't know anything about it, its limitations or its advantages..... As i say your not going to bolt on a set of aftermerket heads on a bone stock Ford 5.0 from a Lincoln and hit that kind of power, sorry but its not going to happen......I know you can build an engine to hit that power, but this was done on a fully stock Lincoln engine, full emissions, stock pistons, stock exhaust, everything the way it comes from Ford....that is nearly a 100% increase in power and nearly triple the effective RPM ranage.... find me a set of aftermerket heads that can do that please..... then keep in mind this was done on a first generation head LOL you guys seriously crack me up !