Tracy Crook wrote:

See answers imbeded:

David Mix wrote:

Hi Paul,
Perhaps you or an ACRE reader could answer some basic questions for

me.

1.) Where do NEW 20b's come from? i.e. U.S. distributor name.

No such thing.  Engine builders like Bruce Turrentine can build them

from

parts though.

2.) Are 20b's available without EFI, as RWS has that base well

covered?

See above

3.) What's the price?

Contact Bruce

4.) Who has - or is developing - a PSRU for the 20b?

We (RWS) make the RD-1B for the 20B engine (up to 300 HP continuous)

6.) What are the overall "box" dimensions from the prop flg - l,w,h?

and

wet

+/or dry weight?

Bare block 20B weighs 247 pounds.

7.)Does anyone have speed/torque curve for 20b's - N/A and turboed -
preferably at the PSRU prop shaft, maybe even overlaid on a LYC

IO540

curve?

This seems like the closest std catagory A/C powerplant for

comparison.

No realistic curves available in our application & configuration.  Your
comparison is a good one.  Think of 20B as an IO - 540 replacement and

you

won't be dissapointed with the power

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

In researching the web for info on the powersports engine, I ran into these
numbers for an Atkin's turboed 20B for a Lancair IV. Looks pretty rational
except the fall off rate at lower rpm seems a bit steep, suggesting some
porting mods, I also plotted half values, which would be a good
estimate for a 13B similar set up . The peak is still at 6000 rpm
with breathing limited fall off above that value. I would have
expected the turbo to push the peak past that point. -= Vance

Perhaps it had a waste gate.

Paul Lamar
 
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