#1
IP: 65.93.38.247
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Engine sound varies
Once the A4 is running and warmed up I get 2 to 3 second changes in engine sound at about 10 to 15 second intervals. The sound seems to become deeper and more 'throaty'. Any ideas?
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#2
IP: 100.36.89.105
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Regulator on the alternator switching on and off, changing the load on the engine?
__________________
@(^.^)@ Ed 1977 Pearson P-323 "Dolce Vita" with rebuilt Atomic-4 |
The Following User Says Thank You to edwardc For This Useful Post: | ||
sastanley (12-24-2017) |
#3
IP: 71.178.81.133
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I agree with Ed's assessment. Do you have a voltmeter or ammeter installed? if not, can you get a voltmeter on the alternator output post while the event is occurring ?
__________________
-Shawn "Holiday" - '89 Alura 35 #109 "Twice Around" - '77 C-30, #511 with original A-4 & MMI manifold - SOLD! (no longer a two boat owner!!) |
#4
IP: 47.156.108.48
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Quote:
TRUE GRIT |
#5
IP: 24.152.132.65
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As a test go for a short run with the belt removed, battery fully charged. Variance goes away and you'll know for sure.
__________________
Neil 1977 Catalina 30 San Pedro, California prior boats 1987 Westsail 32, 1970 Catalina 22 Had my hands in a few others |
The Following User Says Thank You to ndutton For This Useful Post: | ||
sastanley (12-25-2017) |
#6
IP: 74.141.117.175
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Another possibility: a sticking valve. I use a cup or two of Marvel Mystery Oil per tank of gas to prevent this on my boat.
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#7
IP: 76.7.101.46
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If there is no RPM change and assuming that the boat has a waterlift exhaust could this be normal as the water batches?
Dan S/V Marian Claire |
#8
IP: 108.79.1.46
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maybe going thru puberty?
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john '77 catalina 30 #783 the only way to be sure is to make sure |
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