Thread: Cause of RPM gain?
09-06-2011, 07:09 AM #1
Cause of RPM gain?
O.K., So I decided to try running my 3" Kanaflex "without" my filter. Took it to the lake and, whamo! 80-100 RPM gain. Now "as luck would have it" comes the monkey wrench. The day I tested it with the filter was about 20 degrees warmer than it was yesterday when I tested without the filter.
So..was my gain because of the weather, or running filter free?
BTW ,is it normal to lose abot 50 RPM once everything is hot?
09-06-2011, 07:38 AM #2
I bet a lot of people are going to chime in, but Air temp, humidity, and the fact that there is that much less restriction of air going to the motor will give you that little increase. ive had gains of 160-180 when the air is cooler.
09-06-2011, 08:14 AM #3
95 degree air vs 60 degree air 8980 RPMs vs 8700 almost 300 rpms
09-06-2011, 10:15 AM #4
Wow, I was hoping the air temp wouldn't be that much of a factor. I'll probably just put my filter back on then.
09-06-2011, 10:27 AM #5
09-06-2011, 10:52 AM #6
09-06-2011, 11:42 AM #7
air temp and humidity is a huge factor. both my skis really come alive at the end of the day when it cools down a bit.
09-06-2011, 11:49 AM #8
Humidity plays more into it than air temp. I recently went to Arizona and the air temps where in the 110's, but humidity was very low 20% range or less. My TX was running 8160-8180. Back home with air temp in the high 90's, but with 90%+ humidity I was only see 8020-8040.
09-06-2011, 06:11 PM #9
+1 on humidity, it's a performance killer. The colder, less humid, and unrestricted the air, the more power you make.
09-06-2011, 10:41 PM #10
Yes everyone blames the heat for power loss but it is the hummidity that's the problem. Taking the filter off will gain you 50+ rpms.
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