Originally Posted by Cheechako
Did this project
ever get completed...?
Yes, our first sea trial was on Sunday. Here are the results:
We took her out for the first time on Sunday, since fixing the tachometer. She performed beautifully!
The information here is limited -- as I need to repitch my propeller
and am experiencing problems with the FloScan meter. I will continue to update this section as I gather more data.
Here are a few observations:
The Perkins 4.108
is much louder at idle than it is at say 1500 RPM's. As the RPM's increase, the clunking noise
common to Diesel
engines smooths out and becomes hardly apparent. The waterlock muffler
is definitely the way to go with respect to suppressing the sound coming from the exhaust
. There is a huge difference compared to when the engine was operated without it.
The fact that the cabin
are well isolated from the engine compartment helps tremendously. And when the door to the cabin
is closed, it is hardly bothersome.
Exhaust smoke and smell
On a cold start, there is a considerable amount of exhaust
that appears for the first 30 seconds. This is non-existent during warm starts.
As the engine warms up, the exhaust subsides and becomes a non-issue.
She was able to hit 8 knots, but it was at very high (3400) RPM's. The propeller's pitch
is too low. There is a considerable amount of cavitation and the engine is attaining high RPM's effortlessly. I'm currently using a 16X9 propeller
. I want to get some base line data before proceeding with repitching it. I ordered a 15X15 propeller to use as a diagnostic tool. Once I am able to gather data from a propeller with an extremely high pitch
(for this hull
and engine), I will have baseline measurements and can accordingly repitch the original propeller more accurately. I had an extensive conversation with Steve from Thomas Marine
Propellers, and he concurred with this strategy.
No data to report yet. I am having a problem with the return sender on the FloScan unit. Will report fuel
usage data when the problem is corrected.
160 degrees F is maintained at idle and lower RPM's. The temperature jumps to 170 degrees F at 2200+ RPM's. This is consistent with the manufacturer's spec sheet.
50 PSI at starting, gradually dropping to 40 PSI upon engine warm up. There is very little difference in oil pressure at varying RPM's. This is common to the Perkins 4.108