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Is there info in
the archives, or another site that would provide diagrams or photos of what is
done to the ports to improve breathing?
Here's a page that
shows various ports, and describes what to expect. Most folks with
ported engines have something along the lines of a "street port", generally
using the Racing Beat template. I believe that's what Bruce T did to
mine, and Tracy's (now removed) 13B.
.
I am
rebuilding my 20B as a normally aspirated engine to install in the RV-10 I am
building, and the 240 HP from stock is a little less than I would like.
Any input would be greatly appreciated.
Phil in
Willowbrook, RV-10 #40220
As Al
mentioned, you should be able to do much better than that, particularly if
you're willing to run a C drive, and the RPM's necessary to make
power. Tracy documented over 200 HP from his 13B in the very low
7000 rpm range, and I expect to do the same. That would give you 300
HP for a 20B if you could duplicate that level of
development. I would consider that about the limit of what
you could expect from a NA engine though, and it will require porting, high
compression rotors, a good intake, exhaust,
etc.
Cheers,
Rusty (ordering parts
to rebuild the Kolb SlingShot)
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