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Unregistered
Join Date: Aug 2000
Location: a wretched hive of scum and villainy
Posts: 55,652
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Just remember, there ain't nothing like positive intake manifold pressure.
A big powerful engine is nice, but as soon as the manifold pressure goes positive it turns into a wild, scary beast.
I was darned near scared to death the first time I hit the throttle on the hemi after I put on the supercharger.
The boat jumped completely out of the water and the prop went dry, the engine over-revved, and when it came back down and hooked up it violently tried to flip. That was at around 3/4 throttle from a rolling start, prolly 20 mph.
Prior to that I considered the down pedal on the cavitation plate just fluff.
After that I became intimately involved with the up and down pedals because they were the only things that kept the top of the boat from being the bottom of the boat.
I had been driving boats since I was 12 but with that one everything was like the first time.
Oh, another thing that is totally cool: blower surge.
The idle fluctuated from around 500 rpm to about 1500 rpm about every second.
That sounds wild but make it kind of a beotch to take off. On a flat deal you start the engine in gear so as soon as it catches it jumps forward and then backs down. Do that too hard and you have a wave of water that will spill over the back of the boat into the engine area. Not gud.
I had to set the idle kind of high to compensate for the surge so even at idle I was kicking along pretty fast. No such thing as a 5 mph no wake zone for that boat.
Last edited by sammyg2; 07-28-2010 at 09:50 AM..
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