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I have a 21 ft. xs Lightning custom boat 2006, open bow with a 502 chevy marine power with 500 hp. The engine model is a 500x engine. The manual says it should spin 5,200 rpm mine only spins 5,000 rpm at wot. It has a dominator set back pump with a droop, ride plate, place diverter, and a a/b impellor with an inducer, and blue print. The motor also has lightning headers. Is this normal or is somthing not right. Everything is factory set. Before inducer and pump mods it only spun 4,900 rpm. Also having some problems with engine temp never seen it above 115 degree is that normal. One other question does anyone know somewhere that does good gel coat detailing or able to get flaws out of gel around the San Francisco bay area namely east bay or semi close. Any help would be apreciated.
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200 RPM is nothing. That could just be tach calibration. Also, if you ran it on a cold morning in December near sea-level, you would probably run way past 5200.
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I pull a B to 6100 on an average day, but for a trip to the lake I couldn't get over 5600. I checked the timing, random plugs, jetting, still 5600. I went home and pulled all of the plugs and one was white, basically looked new. All the rest were dark brown. I checked the plug with an ohm meter and it would not conduct from the electrode to the plug wire end. Put new plugs in and it pulls 6100 again. Autolites , should have ran NGK's.
I thought I have heard that every 100 rpm takes like 25 hp to turn. So a 100 hp NOS plate will get you 300-400 rpm increase.
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Your right 200 RPM, not 2,000.
Here's a picture of the boat. Trying to think of a name for it. It throws a very nice roost. Thought about "rain maker" but that could cause bad weather, or "purple rain" but that too princey. Any Ideas.
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I think you should see >5200. 500hp with an A is 5400 and B 5700, so you would be more like 5600 with that kind of power.
Each pump is different but from my experience I have a Dom S w/A and it spins 4800-4900 w/390hp 454.
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Your right 200 RPM, not 2,000.
Here's a picture of the boat. Trying to think of a name for it. It throws a very nice roost. Thought about "rain maker" but that could cause bad weather, or "purple rain" but that too princey. Any Ideas.
Or go with my personal favorite name for a jet / ex girlfriend "Pump and Dump"
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you need to call it the NOCKER ROCKER!!:D :D
