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Drop in pressure slight vibration |
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Atomic Dam 
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Joined: May-20-2020 Location: Texas Status: Offline Points: 89 |
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 Topic: Drop in pressure slight vibrationPosted: July-06-2020 at 1:44pm |
The carb was replaced at some point, but when I could not say. It has a Holly 4bbl on it now. It also had an electronic ignition installed. Both the ignition and the carb were professional installs. Outside of that there are no engine modifications. I don't knwo when the last tune up was done. If I remember correctly, the P.O. said either last season, or the previous. |
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OEF/OIF US Army Combat Veteran '75 Southwind 20 Escort 351W |
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GottaSki
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Joined: April-21-2005 Location: NE CT Status: Offline Points: 3359 |
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Posted: July-06-2020 at 1:14pm |
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Like Pete sez.
next steps inspect plugs for any irregular, and do a compression survey |
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: July-06-2020 at 12:47pm |
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John,
Sounds like the RPM drop was from 1 or more cylinders not firing but could also be a fuel issue. When was the last ignition tune up done? Has the carb ever been touched/ As far as the oil pressure goes, here's the: " rule of thumb for acceptable oil pressure is pretty close to 10 psi per thousand rpms." |
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Atomic Dam
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Joined: May-20-2020 Location: Texas Status: Offline Points: 89 |
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Posted: July-06-2020 at 12:30pm |
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Once again in need of all of your wisdom.
1975 Southwind 20, escort 351. I was out this weekend, engine was running strong without issue. Saturday, I noticed that the oil pressure seemed a little low. By little, I mean just below the 40 mark at speed, but it usually is sitting right on the mark. I checked the oil, she was full, and since it was a slight decrease, I decided to just monitor. Sunday, when I went to pull her out of the water I was running about 2200rpm just in plane for about 20 min, when it felt like someone bumped the throttle down and started a noticable a vibration. we dropped out of plane without any change in throttle and the oil pressure dipped even lower. I dropped her to an idle, and she idled fine, but when getting back up to speed the vibration was still present and it was noticeably running with with less power. I immediately put her on the trailer so I could investigate further. Can someone offer me a place to start or even better, a list of of things to inspect that would cause something like this? Currently around 600 hours. |
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Please support The Cystic Fibrosis Foundation
OEF/OIF US Army Combat Veteran '75 Southwind 20 Escort 351W |
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8122pbrainard wrote: