Mintor 170 testing.update

[Koenig, Tom]

I have also just witnessed ( and flown) two Mintor 170 engines this past
weekend, both of which belong to some flying buddies of mine.

I must say..once you get past the 'tightness' as Lance describes and a few
other gremlins that my buddies experienced, the engines do have awesome
potential. It does not seem to turn huge Rpms, but boy this thing loves a
big stick and it does not slow down at all.
I'm a Ys man of many years and I love my DZ, this is the first engine which
could make me consider a two stroker. There is no substitute for cubes!
Sofar I still think the DZ outguns it in the mid-range, that may change as
they run those beasts in, but otherwise I'd say this thing will take on the
Dz'ds easily. I guess the goal posts keep moving.

I'll keep playing with my Ys's but I doubt the 170 will remain a secret for
very long. Hopefully it proves to be reliable.

Tom

-----Original Message-----
From: s.vannostrand at kodak.com [mailto:s.vannostrand at kodak.com]
Sent: Sunday, 30 March 2003 4:07 AM
To: discussion at nsrca.org
Subject: Mintor 170 testing.update


Every moving part is tight initially.  I hope that means long life after
full break in.  This engine is not one of those "run a 1/2 tank through it
and go fly" engines.  It's more like the Saito 180 or a YS120SC.  You have
to take some break in care.  My breakin procedure seems to take a little
longer than some others, so take my experience with a grain of salt.  I'm
breaking in engine #2 now.  It started running pretty normally (able to use
the entire throttle range at one needle setting) after 1/2 gallon and it
ran pretty well after the full gallon.  I like to give it 4-5 cooling
cycles during the first gallon and leave the needle rich, with short bursts
of more lean settings.  All starts are hand starts so far.
    During gallon #2 today I started changing the pipe tuning length using
the standard Mintor CF pipe.  This pipe is a lot shorter than others (only
about 22 inches long) so it's easier to install.  I also switched from 10%
Magnum to 15% Magnum fuel.  I haven't changed the prop from the 17x12N APC.
So as you can see, I changed too many variables to be able to understand
the effect of each one.  In addition, the engine is still breaking in and
improving naturally.  However, the results are exciting.
   At the end of gallon #1 (10% nitro): 7900 rpm  standard pipe setup
  Beginning of gallon #2 (15% nitro): 8200 rpm
  Shortening pipe 3 inches (!! this is a lot, but the rpm's kept going up
each test!!): 8500 rpm

Mind you, it is still running rich and the rpms can be noticeably peaked
with the needle, but I didn't tach it at peak.

--Lance



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