[DMCForum] Re: tone L.O.C.

["cruznmd" <racuti1@xxxxxxxxxxxx>]

Jim,

Thanks for helping square me away on the oil pump issue. I was 
starting to get concerned.

I did find the real numbers in the Volvo manual the I borrowed from 
Mike Cohee.

114-156 psi while HOT, and a cranking rpm of 250-300, throttle wide 
open.

I believe that your compression gets better as things heat up and 
seal up. If that's true then I should have adequate compression. 

Consider this;

I think I'm making half the cranking rpm's specified and the engine 
is cold, so if I were able to speed up the engine and had it warm I 
would probably meet or exceed 114 psi.

Someone also suggested a "leak down test". Wouldn't the fact that I 
left the gauge hooked up to the cylinder and saw no drop in pressure 
satisfy this? I stood around for about 10 minutes wondering what to 
do next, and there was no drop in pressure.

--- In DMCForum@xxxxxxxxxxxxxxx, Jim Strickland <ihaveanaccount@xxxx> 
wrote:
> 100 psi is fine, if I were you I would have hoped for closer PSIs 
per
> cylinder, but you take what you can get.  If one was done at 60psi 
(or
> zero), then you have something to worry about.  
> 
> I would not expect your oil pressure to be very high while 
cranking.  I
> recently got the change to check this out- the oil pressure on an 
engine
> we were testing didn't even push 5psi while turning over, but 
pushed over
> 80psi when we got it running.  The pump doesn't need priming, 
consider
> that it's "out of oil" every time you turn off the car.  
> 
> Jim
> 
> 
> On Mon, 04 Aug 2003 00:52:57 -0000 "cruznmd" <racuti1@xxxx>
> writes:
> > --- In DMCForum@xxxxxxxxxxxxxxx, "Dave Stragand" 
<dave.stragand@xxxx> 
> > 
> > wrote:
> > >The speed of the engine, whether you cranked it with all of the 
> > >spark plugs out, and whether you had the throttle wide open will 
> > all 
> > play a part in the reading.  
> > >  
> > > At 100 psi on closed throttle, all other plugs in, you're just 
> > fine.
> > >    
> > > -Dave
> > 
> > Ok, well as I've said, my engine isn't turning too fast and that 
> > reduces the amount of volume so like the exhaust pressure, this 
may 
> > have been somewhat reduced from the best it could be.
> > 
> > I had all other plugs in, and closed throttle. The fuel was also 
> > diabled so there was no fuel in the cylinder to take up space. 
> > Afterwards, I realized that lack of fuel in the cylinder might 
also 
> > slightly reduce pressure.
> > 
> > -However-, Dave you said in your "DeSoto story" that you sent me, 
> > that it took that engine 165 psi before it would run on it's own. 
I 
> > realize we're looking at a world of difference in engines here, 
but 
> > I 
> > didn't think 90-120 psi would be anywhere near enough.
> > 
> > I also want to say that after putting some Marvel Mystery Oil in 
the 
> > 
> > cylinders, and pulling the plugs, I spun the engine to work it 
in. 
> > The engine cranked at -considerable- speed and yet I still have 
no 
> > oil pressure. Could this be related?
> > 
> > The oil pump worked perfectly when I tore the engine down, and I 
> > didn't ever touch it. I never removed it, or it's chain or 
anything.
> > 
> > It may have been totally drained since the oil was totally 
thinned 
> > out by fuel. Would it have to be primed with oil?
> > > 
> > > -----Original Message-----
> > > From: cruznmd [mailto:racuti1@xxxx] 
> > > Sent: Sunday, August 03, 2003 6:08 PM
> > > To: DMCForum@xxxxxxxxxxxxxxx
> > > Subject: [DMCForum] tone L.O.C.
> > > 
> > > 
> > > Some bright soul out there asked if I'd put a compression gauge 
on 
> > 
> > > the car instead of just my thumb.
> > > 
> > > So today, I purchased a gauge from Advance Auto and measured 3 
> > > cylinders before the rain drove me inside.
> > > 
> > > The manual states that this engine runs at an 8.8:1 comression 
> > ratio 
> > > but I don't know how many PSI or kPa that is.
> > > 
> > > I measured cylinder 3 at 100 psi, cylinder 6 at 120 psi and 
> > cylinder 
> > > 2 at 90 psi.
> > > 
> > > Now I -already- know that that is insufficient to support self-
> > > sustaining combustion.
> > > 
> > > So now I know why the car won't start. Now I need to know:
> > > 
> > > a) What is compression -supposed- to be (in psi or kPa)?
> > > b) What are the possible causes of loss of compression?
> > > c) What could I do to get it back?
> > > 
> > > I know some of b) but I want to hear as many answers as I can 
in 
> > case 
> > > I'm skipping something.
> > > 
> > > As usual, thanks.
> > > 
> > > Rich
> > > 
> > > 
> > > 
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