Donze Z 21
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I have a 1988 Donzi Z with a 454 & 23 pitch mirage prop.
I barely get 55 mph out of it and it porpoises (even with trim tabs)
Does anyone have any experience with installing a bigger motor (496 or 502)? I am willing to do this for more MPH, but I am worried about the porpoising.
I barely get 55 mph out of it and it porpoises (even with trim tabs)
Does anyone have any experience with installing a bigger motor (496 or 502)? I am willing to do this for more MPH, but I am worried about the porpoising.
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I had the same boat with a big block, How long have you had it? It takes some time to find the right tab and drive set up but it would ride nice for me. The best I saw was about 60 mph with a 454/330 with a cam and other small changes.
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Originally Posted by boomer
I had the same boat with a big block, How long have you had it? It takes some time to find the right tab and drive set up but it would ride nice for me. The best I saw was about 60 mph with a 454/330 with a cam and other small changes.
To get any speed out of it, I have to raise the tabs, trim out the drive and I get the porposing + low 50's in speed.
What prop were you running?
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Originally Posted by tholland
I have a'97 18 Classic...the dolphin like porposing is just the way donzi's ride unless your going fast. Good luck with it.
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We Make Fast Toys Faster, Cool Toys Cooler and Old Toys New!.. Performance, Custom & OEM Parts & much MORE![/CENTER]