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HOW FAST IS YOUR CHECKMATE? EVERYONE!

88 Spectra 188...150 blackmax with shaved heads, intake, CCMS reeds...21 pitch cleaver....68.5 at 6200....going to try a prop with a little more lift to get more of the hull out of the water...but for now....no bitches....runs like a swiss watch and I use it all the time...it sits at the dock behind my condo...I also have a 23 Powerplay I bought with a 450 horse 502 that was blown up, that is now going 548 cubes and 650 horse....that will be a fun one.

Have you ever run this boat when it was all stock? I have the same year and model, with the 150 XR4 and 22p Laser II prop, but haven't run it yet, and wondering what speeds I can expect.

Also, another member mentioned his Spectra chine walking badly at top speed. Does yours do this?
 
81 Exciter 200hp 2.4L 72mph gps with a 2:1 lower and a 23p trophy plus @ 7400 rpm.


Will be trying a 1.87 lower with lwp this weekend. Might mess with my 26p laser 2 also.
 
81 Exciter 200hp 2.4L 72mph gps with a 2:1 lower and a 23p trophy plus @ 7400 rpm.
QUOTE]

Something sounds a little off here. 7400rpm with a 2:1 and 23p is 72 mph with 6% slip. Something is either off or you're putting down some great numbers! Are you spinning 7400 on a stock 2.4?
 
81 Exciter 200hp 2.4L 72mph gps with a 2:1 lower and a 23p trophy plus @ 7400 rpm.
QUOTE]

Something sounds a little off here. 7400rpm with a 2:1 and 23p is 72 mph with 6% slip. Something is either off or you're putting down some great numbers! Are you spinning 7400 on a stock 2.4?


Thats 11% slip with his provided numbers. About par for a trophy. Those things slip almost as much as a chopper. Kind of high on the rpm but some people like it that way.
 
Not sure how you're getting that 11% number. Every prop calc I have used is showing 6%.


Its quite simple actually. The engineering concept is referred to as GIGO. Garbage In Garbage Out. You are inputting a 2.1:1 gearcase. The algorithm references (:1) as the ratio denominator. He has a 2:1 gearcase. When you input the ratio, just put "2" as the gear ratio numerator and the program does the rest.If you were inputting a 1.67:1 ratio you wouldn't put 1.67.1.



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spence it is 2.0 to 1 not 2.1 to 1. also that 200 must have a lot of work done to it. byuboyz did a 2.4 200 and it took a lot to spin that up to 7500 mark. Ive heard of some guys running them up to 6500 but I think it was only on a couple of years that would actually make hp up there. I put a set of 21 pitch props on my boat with the 200's and they hit about 6400 and that was it. I turned around and took the props off since the motor wasn't really designed to run that high.
 
Its quite simple actually. The engineering concept is referred to as GIGO. Garbage In Garbage Out. You are inputting a 2.1:1 gearcase. The algorithm references (:1) as the ratio denominator. He has a 2:1 gearcase. When you input the ratio, just put "2" as the gear ratio numerator and the program does the rest.If you were inputting a 1.67:1 ratio you wouldn't put 1.67.1.
My mistake ... so used to entering 1.87 I just hit 2.1 total brian fart on my part:brickwall:
 
Don't feel to bad. I tried it and it wouldn't work with 2 anything. I'm used to 1.5 and couldn't figure out how you guys where getting any %.
 
spence it is 2.0 to 1 not 2.1 to 1. also that 200 must have a lot of work done to it. byuboyz did a 2.4 200 and it took a lot to spin that up to 7500 mark. Ive heard of some guys running them up to 6500 but I think it was only on a couple of years that would actually make hp up there. I put a set of 21 pitch props on my boat with the 200's and they hit about 6400 and that was it. I turned around and took the props off since the motor wasn't really designed to run that high.


Sorry for not replying earlier guys. I completely forgot I posted here. I had to rebuild this engine last year because I stuck a piston at 7100 the first time I took this boat out on the water. As far as I can tell it's stock but now has 1 steel sleeve and 145psi cranking compression and timing at 25deg. the engine block is a 1983 I have no clue if that's a good year for letting it wind that tight but I haven't found a prop that I like better and can't afford a higher pitch trophy at this time.

According to my buddy I had the tach up to 6800 with a 26p laser2 but I didn't have the gps nor was I able to risk taking the split sec to look at the tach ( was not a easy drive ) so I don't mention that time.
 
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