why is my compression bad? :(

[robw_z@yahoo.com (Robbie Cotner)]

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>From what I've read on breaking in engines, there seems to be two ways:  run it hard for awhile, or run it relatively easy for a longer amount of time.  I broke the engine in on a road trip, for the first 400 miles I would get up to about 65mph, drop down to 40, then mash the gas back up to 70mph.  It has been revved above 5k, but only maybe once every 3 weeks or so!  What exactly do you mean by screwed?  If I did break it in wrong, what are the results of that?  Thanks-
Rob
 Daun Yeagley <vwdaun@yahoo.com> wrote:Robbie,

The wear limit on the JH is 109 psi.

Now as for babying the engine, that's the worst thing you
can do, especially when breaking in an engine. In order to
break in the engine you need to run it h-a-r-d. If it's
been 10k though, you may be screwed. Won't hurt to try
however. Just be sure the oil is up to 80 C or so
beforehand, but then wind it out to redline often, and do
the same on downshifting, i.e. time it so you'll be in the
5-6k range.

Daun


--- Robbie Cotner wrote:
> 
> I ran a compression check on my JH 8v today, 135-140psi
> on all cylinders. Adding some 80w-90 to the cylinders
> raised all readings ~10-12psi. This thing was rebuilt
> 10k ago, immediately after the rebuild I had 150psi on
> all cylinders!? I was hoping compression would increase
> once the rings got seated. From what I've read 130psi is
> the minimum for JH's, I'm not happy. Is this why my
> engine has such low power? I really have babied this
> thing, never revved above 5k, I've changed the oil many
> times and am running synthetic 10w-30. My exhaust smokes
> all the time, but the smoke is white as a ghost and I
> attributed it to the cold... my spark plugs also show no
> indication of burning oil. Any opinions on this? Thanks
> in advance,
> 
> Rob
> 
> 
> 
> ---------------------------------
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<P>From what I've read on breaking in engines, there seems to be two ways:&nbsp; run it hard for awhile, or run it relatively easy for a longer amount of time.&nbsp; I broke the engine in on a road trip, for the first 400 miles I would get up to about 65mph, drop down to 40, then mash the gas back up to 70mph.&nbsp; It has been revved above 5k, but only maybe once every 3 weeks or so!&nbsp; What exactly do you mean by screwed?&nbsp; If I did break it in wrong, what are the results of that?&nbsp; Thanks-
<P>Rob
<P>&nbsp;<B><I>Daun Yeagley &lt;vwdaun@yahoo.com&gt;</I></B> wrote:
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Robbie,<BR><BR>The wear limit on the JH is 109 psi.<BR><BR>Now as for babying the engine, that's the worst thing you<BR>can do, especially when breaking in an engine. In order to<BR>break in the engine you need to run it h-a-r-d. If it's<BR>been 10k though, you may be screwed. Won't hurt to try<BR>however. Just be sure the oil is up to 80 C or so<BR>beforehand, but then wind it out to redline often, and do<BR>the same on downshifting, i.e. time it so you'll be in the<BR>5-6k range.<BR><BR>Daun<BR><BR><BR>--- Robbie Cotner <ROBW_Z@YAHOO.COM>wrote:<BR>&gt; <BR>&gt; I ran a compression check on my JH 8v today, 135-140psi<BR>&gt; on all cylinders. Adding some 80w-90 to the cylinders<BR>&gt; raised all readings ~10-12psi. This thing was rebuilt<BR>&gt; 10k ago, immediately after the rebuild I had 150psi on<BR>&gt; all cylinders!? I was hoping compression would increase<BR>&gt; once the rings got seated. From what I've read 130psi is<BR>&gt; the minimum for JH's, I'm not happy. Is this why my<BR>&gt; engine has such low power? I really have babied this<BR>&gt; thing, never revved above 5k, I've changed the oil many<BR>&gt; times and am running synthetic 10w-30. My exhaust smokes<BR>&gt; all the time, but the smoke is white as a ghost and I<BR>&gt; attributed it to the cold... my spark plugs also show no<BR>&gt; indication of burning oil. Any opinions on this? Thanks<BR>&gt; in advance,<BR>&gt; <BR>&gt; Rob<BR>&gt; <BR>&gt; <BR>&gt; <BR>&gt; ---------------------------------<BR>&gt; Do you Yahoo!?<BR>&gt; Yahoo! Tax Center - forms, calculators, tips, and more<BR><BR><BR>__________________________________________________<BR>Do you Yahoo!?<BR>Yahoo! Tax Center - forms, calculators, tips, more<BR>http://taxes.yahoo.com/</BLOCKQUOTE><p><br><hr size=1>Do you Yahoo!?<br>
<a href="http://rd.yahoo.com/finance/mailtagline/*http://taxes.yahoo.com/";>Yahoo! Tax Center</a> - forms, calculators, tips, and more
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