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Author Topic:   IMPACT 21 Repower
impact21 posted 11-18-2003 09:54 PM ET (US)   Profile for impact21   Send Email to impact21  
I recently purchased a 1994 21-foot IMPACT from a government auction. What size motor(s) should it be rigged with? The previous owner had already removed and sold the twins that were on it. The boat is rated for 230-HP and weighs about 1800-lbs., maybe a little more with the t-top.

Any suggestions would be helpful, twins, a single, two stroke, four stroke? And why would be greatly appreciated!

dead in the water,as always unsinkable!

PMUCCIOLO posted 11-18-2003 10:41 PM ET (US)     Profile for PMUCCIOLO    
Having ridden on the local law enforcement agency's 21 Impact, I'd suggest a 200 or 225 two-stroke engine. That will give you the power to tap the boat's high performance characteristics while keeping the weight on the transom down.

Check into the Suzuki 225 EFI two-stroke. My local dealer is selling them VERY cheap as "clearance" models.

Barry posted 11-19-2003 10:36 AM ET (US)     Profile for Barry  Send Email to Barry     
I like twin engines for their redundancy and the improved handling and maneuverability that they provide. However, the maximum engine weight for the 21' Impact is only 650 lbs. So the only twin engine setup that would work would be a pair of 90 2-strokes.

A 225 single may be the better option.

Tom W Clark posted 11-20-2003 02:44 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     

When the Impact 21 first appeared it was rated for only 200 hp. I suspect that many commercial and government users wanted to put twins on it and a pair of 90s proved to but insufficient for some. The next size up in outboards back then was typically a 115 so a pair would total 230 hp.

This is just my theory but looking at the size and weight of the Impact 21 it is comparable to the 1986 -1989 Outrage 20 which also had a rated maximum horsepower of 200. At 1800 pounds the Impact is over 200 pounds less than the Outrage 22 which is rated for 240 hp. A single 225 on the Outrage 22 will produce a pretty swift boat. I imagine a 225 on the Impact 21 would be a bit much. I would think a single 200 would serve you well. There are still EFI 200's being built and they are not that expensive, certainly far less than any pair of outboards.

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