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@xxxxxxxxxxxx> 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 > > > > > > > > Yahoo! Groups Sponsor > > > > ADVERTISEMENT > > > > > <http://rd.yahoo.com/M=259538.3625325.4914071.1261774/D=egroupweb/S=17 > 05 > > 126215:HM/A=1695348/R=0/SIG=11u38u3s2/*http://hits.411web.com/cgi- > bin/hi > > t?page=1374-105951838331032> click here > > > > <http://us.adserver.yahoo.com/l? > M=259538.3625325.4914071.1261774/D=egrou > > pmail/S=:HM/A=1695348/rand=572346768> > > > > To unsubscribe from this group, send an email to: > > DMCForum-unsubscribe@xxxxxxxxxxxxxxx > > > > > > > > Your use of Yahoo! Groups is subject to the Yahoo! Terms of > Service > > <http://docs.yahoo.com/info/terms/> . > > > > > > > > > > [Non-text portions of this message have been removed] > > > ------------------------ Yahoo! Groups Sponsor > > To unsubscribe from this group, send an email to: > DMCForum-unsubscribe@xxxxxxxxxxxxxxx > > > > Your use of Yahoo! Groups is subject to > http://docs.yahoo.com/info/terms/ > > > ________________________________________________________________ The best thing to hit the internet in years - Juno SpeedBand! Surf the web up to FIVE TIMES FASTER! Only $14.95/ month - visit www.juno.com to sign up today! Yahoo! Groups Sponsor ADVERTISEMENT <http://rd.yahoo.com/M=259538.3625325.4914071.1261774/D=egroupweb/S=170512 6215:HM/A=1695348/R=0/SIG=11u38u3s2/*http://hits.411web.com/cgi-bin/hit?pa ge=1374-105951838331032> click here <http://us.adserver.yahoo.com/l?M=259538.3625325.4914071.1261774/D=egroupm ail/S=:HM/A=1695348/rand=117006033> To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> .
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