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-   -   Donzi 21 Hornet, repowered (https://www.offshoreonly.com/forums/general-boating-discussion/378974-donzi-21-hornet-repowered.html)

Alexanderlindahl 04-19-2023 12:56 PM

Donzi 21 Hornet, repowered
 
Guessing some of you will enjoy these pics.
Apparently my old engine broke last year, i tought only the headers cracked. But it was more. Decided to switch it up a little bit :D

Rerigged the boat myself, 2 full weekends and it was done, electrical, fuel lines, engine assembly etc, my wife was not happy with how much time i spent in the shop those 2 weekends, LOL.

496ho with whipple!
Second run (still adjusting fuelpressure, getting to know the hull at these speeds etc) i have done 74.3 knots, that is 85.5 mph. After 70 knots, it starts to chinewalk badly, so I need some seat-time to get to know the hull, but MAN does it get up and go.. now its a real hotrod! The acceleration is mind-blowing!

Bravo1 xr -2 sportmaster and a Bravo1 30P prop, for now.


https://cimg4.ibsrv.net/gimg/www.off...671668ae25.jpg
https://cimg6.ibsrv.net/gimg/www.off...3cd77f3662.jpg
https://cimg9.ibsrv.net/gimg/www.off...13a36981f7.jpg
https://cimg2.ibsrv.net/gimg/www.off...4ffb3cf751.jpg
https://cimg6.ibsrv.net/gimg/www.off...47ec7d9ea7.jpg

Dave M 04-19-2023 01:33 PM

Nice! Looks like a fun boat.

floatingphil 04-19-2023 02:41 PM

Looks great and all that in just two weekends is pretty impressive.

Smarty 04-19-2023 04:54 PM


Originally Posted by Alexanderlindahl (Post 4865083)
Guessing some of you will enjoy these pics.
Apparently my old engine broke last year, i tought only the headers cracked. But it was more. Decided to switch it up a little bit :D

Rerigged the boat myself, 2 full weekends and it was done, electrical, fuel lines, engine assembly etc, my wife was not happy with how much time i spent in the shop those 2 weekends, LOL.

496ho with whipple!
Second run (still adjusting fuelpressure, getting to know the hull at these speeds etc) i have done 74.3 knots, that is 85.5 mph. After 70 knots, it starts to chinewalk badly, so I need some seat-time to get to know the hull, but MAN does it get up and go.. now its a real hotrod! The acceleration is mind-blowing!

Bravo1 xr -2 sportmaster and a Bravo1 30P prop, for now.


https://cimg4.ibsrv.net/gimg/www.off...671668ae25.jpg
https://cimg6.ibsrv.net/gimg/www.off...3cd77f3662.jpg
https://cimg9.ibsrv.net/gimg/www.off...13a36981f7.jpg
https://cimg2.ibsrv.net/gimg/www.off...4ffb3cf751.jpg
https://cimg6.ibsrv.net/gimg/www.off...47ec7d9ea7.jpg

Awesome!!!

seafordguy 04-19-2023 08:41 PM

Fantastic!!!!!!!

I have a16 Donzi OB, but the 20/21's are really the right size.......

1Zoom 04-19-2023 09:52 PM

Very nice, I am very familiar with the hornet, two good friends had them. I spent many hours on each of them back in the day, great boat. Yours looks fantastic, nicely done.

dykstra 04-20-2023 05:30 AM

I love everything about this boat!!

TYPHOON 04-20-2023 01:48 PM

I have a Donzi 1972 GT that I put a 496 HO in it with a Bravo. It run close to 70 MPH. How much HP do you think it makes more with the Whipple?

Alexanderlindahl 04-20-2023 02:29 PM


Originally Posted by TYPHOON (Post 4865165)
I have a Donzi 1972 GT that I put a 496 HO in it with a Bravo. It run close to 70 MPH. How much HP do you think it makes more with the Whipple?

According to whipple, 625hp, so around 200 more.

However. Its running pretty rich, so its gonna make a little less than that. But ballpark 180-200hp more :)


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