PSI/Dyno??

[flippinstick]

Anyone?

[DaveR]

Not quite clear on the question Dyno readings are usually in HP, when you talk PSI and outboards you are usually referring to Cooling Water Pressure. 12-15 PSI is as low a water pressure value as I would ever run a Mercury at WOT (wide open throttle) for any length of time. Maybe water pressure is not up to snuff and worried that overheating will occur, he is smart not to run it. Low H20 Pressure readings are a whole nother issue. if the motor is out of the water it could depends upon the water inlet source, ear muffs water tank? Or maybe the waterpump impeller has taken a set and isn't moving water efficiently or its not working at all. You're not gonna see real high pressure until you give it some RPM. Good Luck and don't dyno a fresh rebuild, let it break in properly first.

[flippinstick]

The motor was built almost a year ago and SOMEONE put this on a dyno and said the PSI was low. THEY said the problem has to be internally and no possible way on the outside. They took the heads off and said it all looks good, it has to be on the outside. Didnt make any since to me and I still have a under powered motor. I was curious to see if anyone else has had any expirence with a dyno.

[DaveR]

I probably missed the mark with my previous post.
I did some searching and found this quote in some literature for a dynamometer.." using a toroid water brake absorber. Loads most high performance engines at any throttle setting or RPM you need to test at - indefinitely! (Requires minimum of 5 g.p.m. @ 30+ p.s.i. for every 100 continuous Hp" ...
So I ain't qualified to correctly answer your question. Cut and paste this link into your browser and if it don't help ya post a question on that board and those guys will get your answer.

http://www.wmi.org/sql_messages_html...ni&num=28508#5