23066 SLP Smooth Bellow Kit Corvette
This section will detail the how and why of intake system design. It's based on a simple formula for calculating what should be a "close to proper" intake tract length. The formula is 90/rpm (in 1000s) = intake tract length in inches. Don't ask me where the number 90 comes from, I don't know, it's a constant quoted in several engine tuning books. You divide 90 by the desired rpm in 1000s, for example 3000 rpm would be 3. For the 2001 race season it looks like the CD-1a (or perhaps I'll call it the CD-1b now) should be able to reach about 14,000 rpm reliably once the new clutch is installed. Using this formula would generate an intake tract length of 6.42 inches. Ok, lets back up, although I want the motor to run well at 14,000 rpm I do not want it to ONLY have power at that rpm. I also need some power at lower rpms. I came up with a figure of 11,000 rpm as the point where I want to produce the most reliable power. It's a compromise, if I tune the motor for 11,000 rpm it should run reasonably well at 14,000 and as low as 8,000 First of all the length of the intake tract is measured from the actual intake valve head, to the very end of the carb inlet. One aspect we cannot effectively change is the measurement from the valve to the outer edge of the intake port on the cylinder head. That measurement will be about 2.5 inches on almost all honda 50 and 70cc motors. Actually it's a little longer if meaured along the outside of the port's curve and a little shorter along the inside of the port's curve, the average is about 2.5 inches. So, there's nothing we can really do to change that, we must start with 2.5 inches.
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