-2 Imco shorty results on 253 hulls?
01-08-2010, 06:13 PM
#1
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-2 Imco shorty results on 253 hulls?
Anyone running a -2 shorty on their 253 Convincors? Looking for how much speed was gained vs. stock height lower. I am currently running a stock height Xr lower w/28p stock Bravo 1 prop reaching speeds at or above 90 mph gps.(current gps head only goes to 90) Any planing/handling issues? Thanks, Chris
01-08-2010, 06:42 PM
#2
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Anyone running a -2 shorty on their 253 Convincors? Looking for how much speed was gained vs. stock height lower. I am currently running a stock height Xr lower w/28p stock Bravo 1 prop reaching speeds at or above 90 mph gps.(current gps head only goes to 90) Any planing/handling issues? Thanks, Chris
01-08-2010, 06:44 PM
#3
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Im running 253 convincer with a -2 imco lower, I did not gain any speed but my tracking and handling improved. I was told that using a nose cone on boats that run less than 80mph slowed them down, i think they may be right. I turn a BBlades 28 bravo 1 at 52-5300 rpm at 75+. What engine combo are you using to see speeds above 90mph?
Last edited by glen george; 01-08-2010 at 06:49 PM.
01-08-2010, 06:56 PM
#4
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The engine is a custom built 496 Procharged R-tech intercooled gen 6 making 825 hp at 6200 rpms. Running hd coupler to 1.5 ratio XR drive with billet cap and Imco full hyd. steering.
01-08-2010, 10:40 PM
#6
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What is a -2 drive. Does that put it lower in the water or raise it? I feel I have a slipping issue due to my drive to high and trying to educate myself a bit and explore options to correct condition.
01-09-2010, 04:24 AM
#7
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Your problem can be a number of things. Prop shaft height , type and condition of prop, anything mounted under the hull in front of the drive, to name a few that come to mind. If your drive is too high, the fix is an easy one. You can easily add drive spacers. The are sold by most everbody in 1/2" increments.
Last edited by Vinny P; 01-09-2010 at 04:46 AM.
01-09-2010, 08:19 AM
#8
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A -2 lower is shorter lower. It means that it will raise the prop shaft height 2" higher than a standard length lower. Generally, raising your prop shaft height will create more slip, especially trying to plane or turn. So, if you are experiencing handling issues with a standard length lower, adding a -2 will most likely only make things worse. As they say, a picture is worth 1000 words. You can easily see the difference between a standard and a -2.
Your problem can be a number of things. Prop shaft height , type and condition of prop, anything mounted under the hull in front of the drive, to name a few that come to mind. If your drive is too high, the fix is an easy one. You can easily add drive spacers. The are sold by most everbody in 1/2" increments.
Your problem can be a number of things. Prop shaft height , type and condition of prop, anything mounted under the hull in front of the drive, to name a few that come to mind. If your drive is too high, the fix is an easy one. You can easily add drive spacers. The are sold by most everbody in 1/2" increments.
02-04-2010, 04:45 PM
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-2 lower
I had a 2001 checkmate 27br I bought the boat used with a -2 imco lower the boat had a stock 500hp efi I also owned 1996 253 and 1996 22 so I no how to drive a checkmate I hated the imco lower the boat ran 66 on gps I put a bravo lower on the boat with the same prop I it ran 69 on gps at lower rpm
