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  #1   IP: 69.156.145.59
Old 08-04-2018, 07:54 PM
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GregH GregH is offline
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Well She Works!

Finally was able to take the boat out for it's first test. The engine overall worked beautifully is what it felt like !

There are of course some tweaks and mods to be done to help it along.

Running a 2 bladed prop but I forget it's dimensions. The top speed is about 5.4kn at 1500 rpm. Any more throttle and there are no changes.

Moving along at 1500 the temp creeped up to about 190F. At about 1000rpm temps hovered between 160-180F.

Oil pressure hovered +/-40 PSI from cold start up to running hot.

My thoughts are

- need to close off more of the water bypass to thermostat so more flow to block?

- the oil pressure, the system needs a good oil change, will that affect the oil pressure? I admit I did not monitor the oil as much as I did the water temps. Should the pressure be changing more than it did ?

Feedback more than welcome !
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  #2   IP: 155.186.126.158
Old 08-04-2018, 08:41 PM
Dave Neptune Dave Neptune is online now
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Greg, those oil numbers are excellent indeed.

The temps depend on the set up. What kind of water are you in, raw water cooled or a HX?

If you are messing with a "bypass valve" be sure the t'stat is removed and/or the correct type of t'stat. Many variations out there. How is yours set up?

Dave Neptune
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  #3   IP: 24.152.132.140
Old 08-05-2018, 12:40 AM
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ndutton ndutton is offline
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In addition to Dave's questions I'd like to know more about the prop. 1500 RPM max is below the recommended minimum RPM for hull speed (1800 is minimum, 21~2200 is sweet).
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  #4   IP: 192.186.122.174
Old 08-07-2018, 08:55 AM
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Quote:
Originally Posted by Dave Neptune View Post
Greg, those oil numbers are excellent indeed.

The temps depend on the set up. What kind of water are you in, raw water cooled or a HX?

If you are messing with a "bypass valve" be sure the t'stat is removed and/or the correct type of t'stat. Many variations out there. How is yours set up?

Dave Neptune
Well bit of confusion here on my part - I have the bypass valve off the old engine but apparently I did not put it on this engine - so right now there is no adjusting valve. Easy swap out but didn't do it. Must have gotten my "to do" list and my "finished" list mixed up!

The T-stat is a 160 '3 spring" one that worked nicely in the pot of boiling water. I'll see if I don't have more info on it or pics. And I'm running raw water.

I'm in Fresh water of Lake Ontario.

The prop I'll have to get back to you; I have the notes somewhere but I think it is 13 x 9 (2 bladed) on an Alberg 30
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  #5   IP: 71.178.80.4
Old 08-07-2018, 10:19 PM
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13 x 9 sounds too big. That may account for the low engine speeds. You are probably faster than you'd like to be at idle forward too.

glad to hear she runs and pushes the boat..all the other stuff will come in time!
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  #6   IP: 192.186.122.174
Old 08-15-2018, 08:59 AM
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Last Sat had her out in calm (can you say glass?) conditions and at 1500 rpm and she was pushing 6.4kn. did a run around the bay for an hour and the temp never went over 180 (haven't replaced the bypass valve yet that is stuck). So will be doing that replacement this weekend and the thermostat removal as well - just have to make sure I have an extra gasket or some permatex handy just in case.
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  #7   IP: 72.69.36.126
Old 08-15-2018, 09:00 PM
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This would be a good time to install a vacuum gauge on the intake and take a bunch of measurements at various RPMs and speeds so you can tell when your prop or your bottom starts to get fouled up.
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