Since I can't Get help on the Donzi Forum
08-28-2008, 08:26 PM
#21
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Thanks for Serving!
The prop RPM difference is not surprising, I have found many prop oddities in my own boat.
Example I can spin 25 3 blade 5900 RPM
I also have a 26P 4 blade I can spin 6000. RPM and the boat is 1mph slower??? Doesn't make sense- but it is what it is.
As for your rig, low to mid 70's sounds about right.
Someone said earlier your mills may be getting tired - do a leakdown test and see what they are holding. With fresh blocks and some bblades worked props you may see 80.
Uncle Dave
Laveycraft 2750 Ilmor 710
Laveycraft 20.8 Sebring 406 SB
Fleetwod nitrous toy hauler
Yamaha raptor 700/Kawi KFX 450
Nissan Titan
The prop RPM difference is not surprising, I have found many prop oddities in my own boat.
Example I can spin 25 3 blade 5900 RPM
I also have a 26P 4 blade I can spin 6000. RPM and the boat is 1mph slower??? Doesn't make sense- but it is what it is.
As for your rig, low to mid 70's sounds about right.
Someone said earlier your mills may be getting tired - do a leakdown test and see what they are holding. With fresh blocks and some bblades worked props you may see 80.
Uncle Dave
Laveycraft 2750 Ilmor 710
Laveycraft 20.8 Sebring 406 SB
Fleetwod nitrous toy hauler
Yamaha raptor 700/Kawi KFX 450
Nissan Titan
08-31-2008, 05:21 PM
#23
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How to get small blocks to go 80+
Sounds like you might need to change those iron small blocks over to a pair of our LSM550's and really see some real 80-90 mph speeds!
Regards,
Ray @ Raylar
Regards,
Ray @ Raylar
08-31-2008, 07:55 PM
#24
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09-01-2008, 10:04 AM
#25
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Go to Donzi.net and PM "Mr X". I don't recall what his was running but I know for sure he walked away from me at 76 mph 
Ted knows Donzi's in and out and will get you pointed in the right direction.
Dan
Ted knows Donzi's in and out and will get you pointed in the right direction.Dan
09-01-2008, 06:03 PM
#27
My 26 has a pretty similar running surface and it runs in the 90's and does it with authority. But hey, its a single.
09-01-2008, 06:24 PM
#28
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You are correct your 26ZX has the same running surface but the big difference is one engine verses 2. The 26ZX will un with big power the boat is made for one engine big block. The 28ZX runs 2 small blocks weight to hull ratio. Big blocks will not work in a 28ZX to dangerous.
09-01-2008, 07:40 PM
#29
You are correct your 26ZX has the same running surface but the big difference is one engine verses 2. The 26ZX will un with big power the boat is made for one engine big block. The 28ZX runs 2 small blocks weight to hull ratio. Big blocks will not work in a 28ZX to dangerous.
I would like to see some more folks do stuff to the twin ZX. I think that some cool things could be done. A couple of Ray's light screamers might be the ticket. That would be a strong package that you could beat on pretty good. If I had to run in rough water I would have looked pretty hard into that idea.
09-06-2008, 08:37 AM
#30
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