PMC
Well-Known Member
Thanks, I'm listening to this with a preventative ear......Sounds like that fitting was installed on a Friday afternoon.
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I probably had it's idle too low or something causing extra vibration.
600rpmPerhaps this has been discussed before, but what is the recommended idle for these engines?
I started there but wasn't smooth enough. I cranked it up until it smoothed out. I'm at 650. A knowledgeable poster here has his at 675. Another has his at 625.600rpm
I think the engine performance sheet I have somewhere listed it as minimum idle rpm 600.I started there but wasn't smooth enough. I cranked it up until it smoothed out. I'm at 650. A knowledgeable poster here has his at 675. Another has his at 625.
675 for me really smoothed it out.
Do the tachs have a pulse count adjustment? Do you have an optical RPM reader to verify this is what the engine is truly running?I got some new digital tachs as a gift. I hooked up the new tach in parallel to the existing port tach. Was surprised. Current analog tach is on left. Digital tach is on right
700 725
900 957
1100 1178
2000 2105
Now to do the starboard side. Based on this I have been turning 2300 rpm or so when cruising at 2200. And my WOT is most likely well over 2700. Here is a picture with the analog tach at 1100.
Same issue on my port. Is this a quick and easy adjustment? Also how does adjusting one affect your engine synchronizer?
Do the tachs have a pulse count adjustment? Do you have an optical RPM reader to verify this is what the engine is truly running?
I have no idea the answer to these questions. I do know all the experts here (FrankW, My3sons, etc) and Aetna tell me these are precise and reflect exactly what the engines are turning. Hopefully one of them will follow this up as to why it's true. I did have to set some dip switches to match the enginesDo the tachs have a pulse count adjustment? Do you have an optical RPM reader to verify this is what the engine is truly running?
http://clubsearay.com/index.php?threads/rpm-gauge-stopped-to-working.82656/#post-933862Do the tachs have a pulse count adjustment? Do you have an optical RPM reader to verify this is what the engine is truly running?
I have no idea the answer to these questions. I do know all the experts here (FrankW, My3sons, etc) and Aetna tell me these are precise and reflect exactly what the engines are turning. Hopefully one of them will follow this up as to why it's true. I did have to set some dip switches to match the engines
Dip switch on tach is set for 127.Looking on Aetna's website, I found the DIP Switch guide. I don't know if the flywheel is 127, 138 or 158 tooth count
https://www.aetnaengineering.com/wp-content/uploads/2016/01/PPR-Engine-Applications2012.pdf
https://www.sbmar.com/articles/beede-tach-settings-cummins-flywheel-tooth-count/
Yup. I just looked up the flywheel on quickserve, says its a 127Dip switch on tach is set for 127.
Same issue on my port. Is this a quick and easy adjustment? Also how does adjusting one affect your engine synchronizer?