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#1
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The bypass is meant to open when the engine reaches roughly 3000 RPM's so that the T-stats are bypassed when the engine is running under load. @ strokers tend to need alot of heat at low RPM's to burn the fuel mixture, but under load they want to be run around 100-130 degrees to prevent a piston from sticking. The water pressure that the water pump produces is what opens the bypass on your engine, so a weak impeller will not make enough water pressure to open the bypass. Also the T-stats don't flow enough water at speed to allow the engine to run cool, so the bypasses are a requirement to allow the cooling system to function at all RPM's.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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#2
07-21-2009, 09:17 AM
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I see but the water passages in the t-stat housing were partially blocked by the RTV. Even if the bypass did open I wasn't getting good water flow around the head, no matter the impeller condition.
I'm going out later to see if there is an improvement. The impeller is next on the list. I going to change it anyway.
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'78 Cuddy with '82/'88 Johnny/Rude 150 
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#3
07-22-2009, 10:58 PM
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It might scare ya to see what that impeller looks like. Could be "not too bad", or "HOLY $&%!".
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1985 Wellcraft V-20, Evinrude ETEC 150: SOLD 1979 Marine Trader 44, twin Ford Lehman 120s 2006 Panga 14, Tohatsu 20
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