LIST TOP SPEED, PROP SIZE/DIA., ENGINE, DRIVE, GEAR RATIO!

[DamDonzi]

EVERYONE, LIST YOUR DONZI TOP SPEED, PROP SIZE/DIA, ENGINE MAKE/MODEL, DRIVE AND GEAR RATIO. THIS WILL BETTER HELP EVERYONE UNDERSTAND WHAT WE ARE DOING RIGHT OR WRONG AND GIVE SOME OF US BRAGGING RIGHTS. PLEASE LIST ALL INFO AND NO LYING.
THANKS
DAMDONZI

[Frank Civitano]

Donzi 22 ZX 454/510hp supercharged, Procharger. At 5 boost
Prop= Bravo1 15.25X30pitch Lab Finished.
Boat WT= 3800lbs
RPM= 4800
Slip=15
speed 77mph GPS
This Winter looking at a Merlin 540/650hp then add supercharger with a 32 blade 800hp should hit 90. Hey Geo here we go!!


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Frank Civitano

[Varyak]

2001 Classic 18
MX 6.2L MPI, 320hp
1.5 ratio Bravo One
Mirage Plus 25P prop
72.1 GPS...so far...engine/boat only 15 hours old, no WOT yet.

[Frank Civitano]

My boat when it was stock 454/310hp 15.25x22Bravo1. top speed was 62 mph.

------------------
Frank Civitano

[Scott Elgas]

1995 Donzi Classic 22'
Yellow/White
502 EFI
Blackhawk Drive
31 pitch props
78.3 mph on GPS

This may be a good time to get everyone's attention. Please check out my "Exhaust System Question" post. Thanks

[RickR]

1990 18 Classic (For Sale)
420HP/454
King Cobra 1.43 to 1
Tuned 22 Raker
5300RPM (sure is a sweet sound http://www.donzi.net/ubb/biggrin.gif)
73.4

1995 22 Classic
Stock Merc Mag 454/350HP
1.5 to 1
23 Mirage Plus
4800 RPM
66.7 2wp (two way pass)


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RICKR
mailto:riggerb@aol.comriggerb@aol.com</A>

[DamDonzi]

1997 18 classic 350 mag/ bravo1, 1:50ratio
vengence 137/8-21p 68-71?gps
4400-4600 rpm
not sure if i have the right prop? anybody else have this combination. I cant spin a 21p mirage or a 23p mirage.

[GEOO]

1976 X-18, Small Block Chevy, MPI, Dyno 575hp & 540ftlbs, Stainless Marine Exhaust, Arneson ASD6, 1.31 gear, 14 x 25 Four Blade Rolla, 82 on gps & speedo (one person), have seen up to 87 on speedo, Engine has only been in boat for 9 hours of running. Still fine tuning prop and engine. Hopefully will get close to 90. GEOO

With stock 1982, AQ311 Volvo, 290 drive, 300hp 58mph, Ultra 24 cupped.

With 383ci,approx 400hp(Alum heads, MPI, hydr roller cam, Stainless Marine exhaust) Volvo 290, Ultra 26 cupped, 66mph.

With same 383 add Volvo E:drive lower unit (speedmaster) 75 mph. GEOO


[This message has been edited by GEOO (edited 09-06-2000).]

[This message has been edited by GEOO (edited 09-06-2000).]

[BERTRAM BOY]

1966 2+3 350 Chevrolet 260h.p. 14x24 cleaver prop Volvo 290 drive 1.68:1. 60mph Engine and drive are raised 3 inches.
BERTRAM BOY

[Tony]

1967 16' Ski Sporter
302 Ford, 300hp
Volvo AQ200, 1.59:1
14 x 23 aluminum prop
5000 rpm's, 60 mph

Will soon be trying a 14 x 24 Ultra prop, hoping to run 65 like Forrest's Inca Gold! http://www.donzi.net/ubb/eek.gif (But, probably dreaming...)



[This message has been edited by Tony (edited 09-05-2000).]

[RickSE]

1996 18-Classic
Alpha-1 GenII, 1.47 Gear

350 2-barrel
232 H.P. @ 3700 ft elevation
19 Pitch 14"? Dia. Quicksilver Prop
54 MPH @ 4600 RPM.

350 4-barrel (same engine)
250 H.P. @ 3700 ft. elevation
19 Pitch 14 3/4" Dia. Revolution-4 Prop
56-57 MPH @ 4600 RPM.

21 Pitch 14 3/4" Dia. Revolution-4 Prop
56-57 MPH @ 4200 RPM.

350 4-barrel (same engine again)
255-260 H.P. @ 3700 ft. elevation
21 Revolution-4
57-58 MPH @ 4300 RPM.
Still working on this one, I'm going to get this combination to 60 with tuning and the right prop.


[This message has been edited by RickS (edited 09-06-2000).]

[CDMA]

'68 18 2+3. Stock 350/260hp. Vovlo 280 with 14x22 Volvo ultra prop with cup added. Solid 57. Hoping for 65+ with 330+ hp new small block.

[GeneD]

When I had a motor...
1966 Donzi 18-2+3
Mercruiser 260
Prop: 14 x 25 Mirage Plus
Drive: Alpha SS
Drive Ratio: 1.5 upper, 1.68 lower (special)
Boat WT: ?
RPM: 4700
Slip: ?
speed 60+ MPH on the Gauge (goes off the scale)



------------------
GeneD
007
Melbourne, Florida

[RickSE]

You know the other thing people should be listing is the drive angle or %up.

Here are some more specs from a good source.

18 Classic
Year:?
Engine: 5.7 GSi 290 H.P. Volvo
Drive: SX
Gear: 1.43
Prop: 22P 14 3/4" Dia.
67.3 MPH @ 4855 RPM, Drive 90% up.

18 Classic
Year:?
Engine: 5.0 220 H.P.
Drive: Alpha-1 GenII
Gear: 1.47
Prop: 19P 14 Dia., Vengeance
53.5 MPH @ 4600 RPM, Drive 60% up.

18 Classic
Year:?
Engine: 5.7 MAG MPI 300 H.P.
Drive: Bravo-1
Gear: 1.65
Prop: 25P 14 1/2" Dia., Mirage+
68.4 MPH @ 5040 RPM, Drive 90% up.

Hey Varyak, you already have 4 MPH over the 350 MAG, sounds like your right where you should be. I bet you've got a few more MPH in her though. When do we get to see pictures of your new boat?


[This message has been edited by RickS (edited 09-06-2000).]

[PaulO]

Now, either my 2 handy boat speed calculaters (which both come up with the same numbers) are wrong or, the slip factor I am using is way off (10% which I thought was probably better than real life) or, there are other factors I am not considering, but, for some reason, many of these speeds don't add up. I am absolutely not accusing anyone of exaggeration. Just wondering why many of these numbers don't work. It was posted here at one point that slip was about 12% for an 18'. I have no way of knowing if this is accurate. Actually, I wanted to back into the slip factor by using these numbers.
PaulO

[Forrest]

Here is the setup on my 1972 16 Ski Sporter:

65.2 MPH on Trimble GPS @ 4700 RPM with 2 people on board 24 gal fuel + beer, ice, etc.

(cut and pasted from previous post)
* 1991 Ford 302 flat-tappet block and cast crank
* Open chamber 69cc heads (intake gasket matched)
* KB116 hyperutectic dome pistons (9.4:1 CR)
* factory 5.09" rods with ARP bolts
* Crane Powermax H-272-2 cam kit
* Edelbrock Performer 289 intake with ARP bolts
* Holley Marine 450 CFM vacuume secondary carb
* closed cooling systen with 160-degree thermostat
* Kodiak center-rise aluminum exhaust and risers
* Mercruiser 215 HP cast-aluminum seven-quart oil pan
* Alpha One SS drive (1.5:1)
* 14 x 23 three-blade Merc outboard motor cleaver prop

Note: The old 16 Donzi Ski-Sport hull differs from the new "Sweet 16" Classic. The inside lifting strakes on the 16 Ski Sporter ends about 16" from the transom, which causes this boat to run very high on the water. On the other hand, the inside lifting strakes on the later model Sweet 16 end about 4-feet from the transom, which make this boat run with more hull in the water producing a more stable and predictable ride than is to be had on the early model 16 Donzi. For this reason, the same setup in the later model 16 Donzi will most likely produce different results than listed above.

------------------
Forrest

[RickSE]

My previous posts included numbers from a very good source, these numbers are from a computer model and based on actual test results. Most boat speed calculators do not consider drive angle as this one does.

Volvo GSi:
67.3 MPH, 4855 RPM, Drive 90% up, 9.0% Slip.
@ 4500 RPM & 70% up, 10.5% Slip.
@ 3500 RPM & 20% up, 12.8% Slip.

5.0L:
53.5 MPH, 4600 RPM, Drive 60% up, 9.7% Slip.
@ 4500 RPM & 50% up, 10.3% Slip.
@ 3500 RPM & 30% up, 11.0% Slip.

350 Mag:
68.4 MPH, 5040 Rpm, Drive 90% up, 9.0% Slip.
@ 4500 RPM & 70% up, 10.5% Slip.
@ 3500 RPM & 20% up, 12.8% Slip.

My Application: Based on Speedo numbers

19P Revolution-4:
3000 RPM, 33 MPH, Drive 100% down, 16.7% Slip
3500, 41.6, 25% up, 10.0% Slip
4000, 47.8, 50% up, 9.6% Slip
4500, 54.2, 70% up, 8.7% Slip
4600, 56, 80% up, 7.8% Slip

21P Revolution-4:
3000 RPM, 38 MPH, Drive 100% down, 12.5% Slip
3500, 45, 25% up, 11.3% Slip
4000, 51.8, 50% up, 10.7% Slip
4200, 56, 80% up, 8.0% Slip

The Revolution-4 has a lot of bite and does not slip much. I believe why this holds in turns and accelerates so well.


[This message has been edited by RickS (edited 09-06-2000).]

[BillG]

1966 18 2+3
285 HP 351
Volvo 250 1.61-1
Ultra 14 X 24
4900 RPM
58 mph on GPS

Bill G

[RickR]

PaulO
Some of the props have been reworked, like the one on my 18.

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RICKR
mailto:riggerb@aol.comriggerb@aol.com</A>

[BERTRAM BOY]

Hey Forrest,
That Trimble stuff is pretty high end. What model are you using?
BERTRAM BOY

[Varyak]

RickS,
Pictures coming...(scanner problems).Check my listing in the Registry in a couple weeks (Laszlo - 18)

[Owen]

Come See! Help to make calculations for prop from friend in Russia. http://www.boat.vladivostok.ru


[This massage has been ebbited by Owen (ebbited 09-07-2000).]

[Forrest]

BB, It an old hand-held Ensign XL, but it works great, especially now that SA is gone. It has a 1993 copyright when you first turn it on, and cost over a thousand whne it was new. I bought it used a couple of years back for $85 to verify my Furuno GP30 in my Magnum and to use on the Donzis. These days, any new $120 GPS will do the same and more, and will be easier to use. Trimble no longer makes consumer grade GPS systems, just the high end stuff for marine, aviation, survey, agraculture, construction, etc., as well as GPS engines for other GPS manufacturers.

Owen, that's a neat site!
------------------
Forrest

[This message has been edited by Forrest (edited 09-07-2000).]

[Spitfire Dave]

1981 18' 2+3 Classic
408 ci sb chevy
Alpha ss 1.5 ratio
Mirage 23p 75.5 mph @ 5800 rpm
Merc Clever 23p 76.4 @ 6000 rpm
Spinelli 25p 77.6 @ 6000 rpm
Readings are gps with 3/4 to full
tank of fuel on a 90 deg. Michigan evening.

[Spitfire Dave]

1981 18' 2+3 Classic
408 ci sb chevy
Alpha ss 1.5 ratio
Mirage 23p 75.5 mph @ 5800 rpm
Merc Clever 23p 76.4 @ 6000 rpm
Spinelli 25p 77.6 @ 6000 rpm
Readings are gps with 3/4 to full
tank of fuel on a 90 deg. Michigan evening.

[Barry Phillips]

1998 Classic 18 with 350/250 HP,
Brovo 1, spinning a 23pitch Vengeance.
65mph confirmed by radar with one
passenger and 3/4 of a tank of fuel.
67 mph on speedo running alone
light chop.

[Kevan Donzi Ski Sporter16]

1972 Ski Sporter with a 302, build late 80's with a Edelbrock Dual-plane manifold, Holley 650 Dbl-pumper, original H/M stuff, 4 large people (other two weighed 425 between them), 23 gal gas, crappy aluminum 14-3/8x21 prop with prop burn almost thru the blades turned 50 on GPS, my guess with just my wife an I, the good Michigan/Spinelli Bros 14-1/2 X21 would be an honest 55. Am I about right?

------------------
Kevan in Vermont.
Way in the near future, Southeast of disorder

[Emmo]

Kevan- Try a 450 CFM carburator on your 302. The trick to making a 302 run is intake velocity. You can get more volume out of a bigger carburator but it also slows the flow up, the 450 is all it needs. I saw 5,000 rpm on Forrest's tach (he could only read the GPS below 4700 or so and he still got 65.2 mph@4700) right before the interior blew out and he has a 450.

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Emmo mailto:emmette@emmette.comemmette@emmette.com</A>

[Barry Phillips]

Need to check my drive for ratio and
prop diameter, I am sure it is 1.5.1.
will get back to you.
SO-SLO

[Stromer]

1972 18 2+3 (Red hull / White deck)
1999 Volvo Penta 5.7 GSi 307CSHP/280+PSHP
4" thru -hull exhaust (no mufflers)
Volvo Penta SX Drive 1.45:1
21"PLUS RAKER SS(approx. 23")LH

NOTE: Following off boat gauges only:
WOT RPM 4850-4900
TOP SPEED 72-74MPH (moderate trim)
Custom 40 gal fuel tank
New engine installed at 14 5/8" X-dim.


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[mehaynes]

1979 22' Criterion w/ 8:1 454 and Gale Banks setup w/twin turbos; 8-10 lbs. boost @ 5500 rpm; TRS OD and Merc. II trans; approx. 550 hp. Prop is a Merc. 25p. I've recently replaced all gauges w/Faria's and am running a water pressure spedo. Running in cool weather I can bury the 80 mph spedo @ 5700-5800 rpm, so I'm assuming 80+.

Mark