Big Ben

Can anyone point me to where I can find some various technical specs for the F20C?

Specs. such as:

Volume in CC's of each cylinder head chamber
Max flow of intake and exhaust of the head per cylinder
Valve diameters
etc, etc, etc.

Thanks for any help

Ben

Big Ben

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Big Ben

No one knows? I have searched all over the net and all I find is crap that isn't hard to figure out like the bore and stroke, displacement in exact cc's, weight, etc.

But I need more technical specs such as listed above. Does no one know where to find them. Are they in the shop manuals?

Sideways

The intakes are 36mm and weigh 51 Gm , exhaust 31mm and weigh 47 Gm. My chambers are 56.0cc but I didn't measure before altering.

At 8" H20 and 0.450 lift the intake flow is 164.21 cfm and the exhaust is 110.70 cfm

Reported results may vary with the pressure used. 8" H20 is on the lower side of reported testing pressures. I had to pay big bucks for this info so enjoy.

Big Ben

Thank you very much. I figured this info would be on some website somewhere. That flow is much higher than I originaly thought it would be. But I guess it has to be very high for such a small motor to make such big power. What did you have done to your heads? Did you have the ports enlarged? And how was the improvement?

Again, thank you very much for the info, it is greatly appreciated.

Sideways

Porting and unshrouding the slightly larger valves increased the intake flow 8.3 cfm and the exhaust flow increased about 18.5 cfm! I have not installed yet.

Big Ben

[QUOTE]Originally posted by Sideways
[B]Porting and unshrouding the slightly larger valves increased the intake flow 8.3 cfm and the exhaust flow increased about 18.5 cfm!