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At 03:56 PM 5/31/2005, you wrote:
I must say I agree with Tracy on this, after looking at both, the only difference been power seems ( to me) to be as a result of the complex porting. As this will be scrapped for a 'home-brew' port arrangement, I believe the 4 port will be a lot easier to work on - for the average builder!
The two extra ports get you 40 extra HP with no additional weight.
This is a 20% increase in HP for the trouble of building two more runners on the intake.
The top speed for an RV-7 with 247 HP could be 240 MPH, perhaps even more with a skinny cowling. (I realize this is beyond the 230 mph Vne, but I was just making a point.....)
Regardless, it's fun just to think about a 75% cruise speed of 213 mph.
Bill Dube'
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