YS 140 DZ life time

[Del Rykert]

Thanks Troy for excellent well stated facts with the info to explain your
findings.

        Del

----- Original Message ----- 
From: "Troy Newman" <troy_newman at msn.com>
To: <discussion at nsrca.org>
Sent: Saturday, November 15, 2003 4:14 PM
Subject: Re: YS 140 DZ life time


| Top power just like with any other ringed motor will be at about 200
| flights....Once you get over 200 it will loose a little and maintain for
| about another 200-300...The difference is about 200-300 rpm tops....So you
| can get consistent and good power out of the motor for about 300-400
flights
| easy.....After that I have found that the ring is all that needs replaced.
|
| If you want that back to the tip top performance you can stick a new ring
in
| it now...about $20....
|
| This is about the same life as I found with the YS-140FZ's, 140L's and
even
| when I ran the OS 140EFI....
|
| Best power was when things were less than 200 flights....Most people don't
| realize the power loss at the 200 flight mark becasue they have so much
| extra....But I keep really good tabs on what RPM my motors are
| running....Last year I had a couple motors each with over 500 flights on
| them and when I changed the ring, piston and sleeves the power was back to
| amazing....
|
| The difference is really the difference between the restrictor and
not.....
|
| So to answer you question a new ring could be in the near future on the
| motor with about 160 flights...and you are about 1/2 way there on the
other
| motor.....They will last long past still making excellent power...but will
| taper off slowly. This is common on all the ringed motors....
|
|
| Now one thing the DZ has going for it...the new piston doesn't get out of
| round as easy as the early relieved and dished pistons on the 120SC,
140FZ,
| and 140L's
|
| So the piston is much more robust on the DZ....By the way this new piston
is
| also in the 140 FZ2 (USA-Its the FZ Sport)...This new piston will also fit
| in any of the 140's.....
|
| Plus the DZ is not the high compression and super charged setup that the
| 140L is and its better on all the other parts like cam gears and the
| pistons, rings and so on.....
|
| This has been my experience I have 3 motors and been running 2 of them
since
| May 2001.....I have about 800flights on one motor, 600 on another and
about
| 200 on a newer one from this year.
|
| The two older motors have gotten cam gears, bearings, new o-rings,
gaskets,
| and pistons, and sleeves as well as the new rings. But these have mega
time
| on them and have been excellent running motors....
|
| Another place to look for power loss is in your header and pipe. I thought
I
| had a weak motor this past spring...When I changed pipes from a 5-6 year
old
| Hatori I gained about 400 rpms.
|
|
|
| Troy Newman
|
| >From: Mr LUMIA <MARC.LUMIA at wanadoo.fr>
| >Reply-To: discussion at nsrca.org
| >To: "'discussion at nsrca.org'" <discussion at nsrca.org>
| >Subject: YS 140 DZ life time
| >Date: Sat, 15 Nov 2003 07:51:52 +0100
| >
| > I currently use two YS 140 DZ coming from Central Hobbies, no problem ,
| > very nice engines, running with Cool Power fuel 30% nitro, APC 16*12 at
| > 8600 RPM for FAI F3A pattern.
| >First is 160 flights old, second 90 flights.
| >Now the first one seems to loose little power after one year of use.
| >
| >What do you know about the life time of this engine ?
| >Which spare parts have to be changed after which number of flights ?
| >
| >Marc Lumia
| >
| >France
| >
| >
|


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