3M Mintor 170 questions

Mon May 5 10:25:33 AKDT 2003

Hi Dean,

I cut 1.0" off the 3M stock header, used a ¼" gap on both the 3M 140 and
170.  I noticed an increase in performance in both engines.  

3M 140:  15% cool power, two OS A5 plugs, 16.5 x 12W apc, 8380.  With  only
1.5 gallons through the engine, I've not totally leaned the top end.
Throttle response is excellent on the ground.  In flight, there are no
hesitations, pops, or other lack or running.  Tight inverted pushes like the
bottom of the center humpty bump, ½ roll down full roll up exhibit excellent
throttling.

Jim W.

----Original Message-----
From: Dean Pappas [mailto:d.pappas at kodeos.com] 
Sent: Monday, May 05, 2003 11:23 AM
To: discussion at nsrca.org
Subject: RE: 3M Mintor 170 questions

Hey Eric,

The 17-13N on an O.S./Bolly EQ140 wanted a 27-1/4" length for tractability,
but a 26-1/2" length for good horsepower and minimal richening in W.O.T.
level flight.

With the Hattori #900, the length was 25-1/2".

My experience with the 3M 140 and its stock carbon pipe is that it wants ~1"
between it and the stock header. I don't know, off the top of my head, where
that puts the first baffle, but it looks short. If the 170 runs like the
140, what you will discover is a pipe length that is very little compromised
(lengthened) for mid-range, and carburetion that makes the midrange behave
despite this. You might even hear a hit of short-pipe "strangle" on the
ground. I suspect that the second baffle plays an important part too.

Call me here at work ...

Dino

-----Original Message-----
From: Henderson,Eric [mailto:Eric.Henderson at gartner.com]
Sent: Monday, May 05, 2003 2:08 PM
To: discussion at nsrca.org
Subject: RE: 3M Mintor 170 questions

I noted a 2" difference in the 1st baffle position in the Bolly pipe to the
OS and OS clones. Do you have tuning distances for the 17 x 13 APC and the
Bolly pipe, by any chance??

Regards,

Eric.

 -----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On
Behalf Of Tom Collins
Sent: Friday, May 02, 2003 9:45 AM
To: discussion at nsrca.org
Subject: RE: 3M Mintor 170 questions

I currently have spare bearings/pistons/sleeves/O-rings/cyl-heads for the
3M140 and will be stocking the same for the 3M170. So, getting spare parts
should not be a problem.

Tom Collins

www.BuyRC.com <http://www.BuyRC.com> 

-----Original Message-----
From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On
Behalf Of GW
Sent: Thursday, May 01, 2003 9:35 AM
To: discussion at nsrca.org
Cc: Don Kanak; s.vannostrand at kodak.com
Subject: 3M Mintor 170 questions

For those in the know regarding the 3M 170::

1: I notice the rear bearing is a double back ball bearing, I do not know
what this truly means, but will Boca or the US based 3M retailers  have the
replacement bearings available? Any other substitutes? Don't want to be
needing a bearing in the middle of the season and be waiting for a bearing
from Italy!

2. Same question as above but regarding rings? Do the retailers like BuyRC,
PlanesPlus, AeroSlave, etc, have replacements in stock, or plans to?  Again,
I do not want to be without use of an engine waiting on a ring or bearing
from Italy!

3. Will the 170 be a drop in replacement for the OS 140? I have heard the
bolt patterns are the same, but what about the position of the nose ring,
exhaust,etc? Completely interchangeable with no refitting needed?

Many Thanks

GW

cc: Don Kanak, Lance at Areoslave

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