[NSRCA-discussion] was 1.40 L vibrations now DZ170

[Bill Glaze]

Could it be that the 1.70 requires different thicknesses to reduce the 
compression to the degree needed?  And, just how thick are they?  As noted, 
the one I I used in my 1.40 L is .0085 thick.  Presumably, the 1.70 has a 
different bore/stroke ratio than the 1.40, although again, I don't really 
know.  Is the O.D. of the sleeve different or larger than the 1.40?  It 
might stand to reason that it had to be so.  I'd give Verano a call at Y.S. 
services for some guidance on the issue.  He's been quite helpful to me.
Bill Glaze
----- Original Message ----- 
From: "Atwood, Mark" <atwoodm at paragon-inc.com>
To: <nsrca-discussion at lists.nsrca.org>
Sent: Sunday, December 06, 2009 1:08 PM
Subject: Re: [NSRCA-discussion] was 1.40 L vibrations now DZ170


>I would agree but take note that the Shims for the 1.70 are different in 
>thinkness than the other Ys engines.
> --------------------------
> Sent from my BlackBerry Wireless Handheld
>
>
> ----- Original Message -----
> From: nsrca-discussion-bounces at lists.nsrca.org 
> <nsrca-discussion-bounces at lists.nsrca.org>
> To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
> Sent: Sun Dec 06 13:15:08 2009
> Subject: Re: [NSRCA-discussion] was 1.40 L vibrations now DZ170
>
> This is beyond my experience; I had heard that the 1.70 vibrated much less 
> than the 1.40 L.  Maybe I heard something that's not true?  But, if my 
> experience means anything, I wouldn't hesitate to give it a try.  I can't 
> guarantee the same great results that I got with the 1.40 L, however, it's 
> an easy modification that can be put back again if no gains are realized. 
> IMHO.
> Bill Glaze
>
> ----- Original Message ----- 
> From: Jerry Wilson <mailto:jcwilsonjr at comcast.net>
> To: 'General pattern discussion' <mailto:nsrca-discussion at lists.nsrca.org>
> Sent: Sunday, December 06, 2009 12:44 PM
> Subject: Re: [NSRCA-discussion] was 1.40 L vibrations now DZ170
>
>
> My son has a DZ170 on Hyde mount that is also a beast on idle.  Wonder if 
> a shim might help it?
>
>
>
> ________________________________
>
> From: nsrca-discussion-bounces at lists.nsrca.org 
> [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Bill Glaze
> Sent: Saturday, December 05, 2009 1:46 PM
> To: General pattern discussion
> Subject: [NSRCA-discussion] 1.40 L vibrations
>
>
>
> Many thanks to Jerry Stebbins for his suggestion to cure the extreme 
> vibration of my Y.S. 1.40 L.  Richard Verano of Y.S. services was kind 
> enough to send me a head shim for the engine.  The shim was only .0085" 
> thick, but it did the trick.  The engine is now markedly smoother at all 
> rpm ranges, and idles much more smoothly,  The transition to high speed is 
> immediate, with no hesitation or burping. And, it only cost me 200 rpm at 
> top speed, (WOT.)
>
> Should I choose to, or need to, obtain the extra rpm's, I can do so with 
> 30% heli fuel.  I can't believe it's the same engine.  It's gone from 
> being an expensive paperweight, to a viable powerplant.
>
> Many thanks to all who replied; this list is such a great source of help!
>
> Bill Glaze
>
> NSRCA 2388
>
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