[NSRCA-discussion] was 1.40 L vibrations now DZ170

[Archie Stafford]

Keep in mind, how soft your mount is can also affect this.  Mine shows
vibrations much worse with the new LR series of mounts, since at idle the
engine is almost hard mounted if I get the idle too low.

Arch


-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Bill Glaze
Sent: Sunday, December 06, 2009 2:46 PM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] was 1.40 L vibrations now DZ170

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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