Looks awesome....

Looks very nice. What torque numbers did those motors make? What drives are you going to be running?

love the dash! wish it was clickable

Max torque is 608.1 @ 5000. Has 565.8 @3800 and basically runs high 500 to low 600 all the way through 6200rpm.

The drives I have are TRS. I know these are a little old school and there are a lot of differing opinions on their durability but I also know they took this boat over the century mark before with old school 3 blade props. I'm hoping the Bravo 28's I have will work better.

Thanks all for the words of encouragement. As you can see from the age of this thread, this has been a long labor of love.

Well, if this math works, my 1302 HP should take me 125?! I don't think the curve quite works like that but I like the direction!!!! Shouldn't have any trouble getting well into the 80's I suspect which is my minimum goal. From there, it is gravy.

Thanks Padraig. Really looking forward to getting this thing in the water for the first time this summer/fall.

great to see this project coming together! any reasons why you have chosen white racing engines? motor seems to be amazing

C

From a price / performance perspective, I couldn't find anything close to these engines. Fred was great to work with and actually has a 130mph cat himself so he is a boat guy that builds racecar engines. Knows what he is talking about. I got 652 HP, brand new dart block, all forged internals, AFR heads, full roller valve train, etc... These motors make big power and were affordable.

No others were close and I looked around a lot.

very nice. Really like those combos. been looking for quite some time as well…

Yea.!! You'll be in the 80's easy.! My boats probably heavier than yours, and I'm 550 a side, spinning 28 4 blades, and getting 83... Your lighter, more hp and can turn the props a few 100 more rpms I'd say... Your boat is gonna run good! Love the work your doing.!! Your boat is bad a$$.!!

I agree! My full cabin '90 with stock 502/415's is right at 80 (ok, 79.3)...I think those small blocks will help a lot!

Kenny,
What RPM's are you turning at 83 with those 28's? My math says about 5200 if you have 10% slip. Mine hit the biggest power at 6200. If I can spin them that fast, I'll be dancing but I think that is a stretch? What drives? I think I may have asked that before but don't have it written down. I'm collecting a bunch of different numbers for 30's for comparison purposes. Something to occupy my mind during this long build.

Ziemer,

How about you? What drives? What RPM's at 79.3 and what props are you running?

Thanks,
Tom

Hydro Q-IV 28's... Right in the neighborhood of 5000-5100. Last time out port motor was tickling the rev limiter, which is 5150 (I think) and the stbd right behind that. Turning them in on B-1 drives.

Looks like these boats are very consistant .09 to .12 prop slip. That is really the variable we are talking about here along with the key question of how much prop can your power turn.

Thanks for the data. Here are some examples of 30' velocities and speed numbers.

502's 28", Bravo 1 HP500, 1.5 Bravo XR, 28" 5 blade hydro's HP500, 1.5 Bravo XR, 31" 5 blade hydro's 540 HP 383's Bravo 415hp 502's
RPM 5000 5300 5300 5200 5100
Drive Ratio 1.5 1.5 1.5 1.5 1.5
Prop 28 28 31 28 28
Slip 0.12 0.09 0.09 0.1 0.12
Max MPH 88.38383838 93.68686869 103.7247475 91.91919192 90.15151515
Real MPH 77.77777778 85.25505051 94.3895202 82.72727273 79.33333333

I have bravo drives, 1.5 gears, turning 28 4 blade bravos, I'm spinning them way high, I'm up over 5600 Rpms, my slip is kinda high. We're guessing my HP at 550 a side?(the last owner built the 502's to HP500 specs, but has A/M steel heads, different intake, carbs, crossover tubes and dry exhaust). He had the motors built in 2003 and couldn't find all the paper work on specs, so I'm just guessing on the HP) I think my boat would be happy with a set of 30 bravos. I have a set of 30 and 31 spinillis, but my data is real inconsistent with those props, I need to go out one day and with good conditions and run all the props in both directions.. My boat is a solid 2mph slower with the props turning out... I was hoping my boat would like the spinillis, but I don't think I have the power for the 31's, and the 30's i was told the diffuser rings need cut off to see better top speed with them... I'm gonna try a set of 30 bravos once the boats out for the season... It was my first year with the boat last year, so at top speed I was focusing all my attention to trim gauges, steering my a$$ off, and holding my butthole closed... So the exact rpms I'm not sure, it was defiantly over 5600, into the 5700's. my friend has a GPS app on his phone, the while its taking video the speed is displayed on the screen, and he has a suction cup mount that hold the phone video taping the tac's... I'm gonna use that when I get my hands on those 30's

I'm sure my info dosnt help much, being I'm cloudy on HP and R's. I'm wondering if as I'm climbing the R's by trimming and tabbing, that maby I'm reaching max speed of 83.1 at like 5400-ish, and then over trimming it to far and pushing the R's into inefficiency? not gaining any, or even loosing speed? everything is hard to see at top speed with a 30' boat dancing around like a bass boat.! I slow down and look at the max speed after.? I know someone else could drive this boat better than I can.. What do you guys do as far as trim and tabs to get it up on the pad? I'm sure it's hard to type but like do you get on plane and throttle up, then bring up tabs and trim till top speed? Or do you get rolling 3/4 throttle with the tabs set, the. Trim and throttle together to top speed?
When the last owner took me on the test drive I coulda drank a cup of coffee at full speed... When I'm running in the 80's my friends are flying around the cockpit like it's a bouncy house.! And I'm steering so hard I look like in doing the chicken dance at a wedding.?!

Oh, plus you gotta calculate in an extra Mph or 2 for "bad ass factor" on your boat.!!! ;-)

I like to get in the 4000-4500 range with the trim set around 5 ish and the tabs around 4. Hammer down and bring the drives up to 7-8 and slowly bring tabs up to optimal position. I can't get the tabs much above 3, as it wants to porpoise with the drives turning in. 3 or so is around parallel with the bottom so that's not a bad thing. With the drives in, the ass will feel a little light and you definitely have to drive it. However, you don't want to "overdrive" it either. If it's starts walking, bring the drives in a bit and start over...

Make sure drives are aligned, and adjust the tie bar if need. I believe I'm sitting around 1/8" toe in (props are 1/8" closer than nose of the drive) Also make sure your indicators match the position of the drives. So when you're at 5 on the indicators, both drives are at the same level. Same with tabs. My drives were out about a 1/2" on the toe and it made a huge difference.

I feel like with my stock power, I've got mine fairly high on the trim almost over trimmed to get the boat out of the water, but with big power, you could probably get away with less trim... maybe 6, 7 max...

Thanks much for the feedback guys. You reminded me that once I get all this work done, I'm still not going to be able to drive this beast!

Is your boat ready to go yet?

Things progressing but painfully slow. Most of the dash is set up now and boat is back at paint shop to have the deck painted. Then, motors in, off to interior.

Progress
 

Ok, moving again. Paint is DONE. Engines are nearly assembled.
https://sites.google.com/site/mitche...=300&width=400
https://sites.google.com/site/mitche...=298&width=400
https://sites.google.com/site/mitche...=300&width=400
https://sites.google.com/site/mitche...=298&width=400
https://sites.google.com/site/mitche...=300&width=400

She is beautiful! Thanks for the update.

Padraig

Very beautiful indeed.

Thanks guys. Got it over to a shop near home so I can start re-assembling! Many questions to come I'm sure.

Some dash progress.

https://lh4.googleusercontent.com/-C...o/IMG_7009.JPG

Looking great. I want to see this boat when done, please.

Padraig

SCREEEEEEEEETCCCCCCHHHHH..........

The sound my project makes when coming to a near complete halt due to other priorities.... Damn. Thought I was gonna get their this year. I'm probably down to about 40 hours of work left.

This thread is likely to expire first! :Whatever:

Let's GET-R-DONE this winter. I want to see it at your dock next summer next to the Thompson.

XT

Looks good! last I saw it the dash was just sitting there for ideas...... I'm with Dave get it goin!!!

Thanks Full Force. Hard to make any real progress at this point since boat is an hour away in Marblehead. I'll be there for a long weekend over xmas breat. Will try to at least get things unboxed and organized.

Some of us OSO guys are meeting at Brew Garden in Middleburg hts tomorrow night at 7 for some drinks and chat if you wanna meet up...

Keep me in mind next time around - Thanks!

How thick is the alum and what type of framing did you use.( Impressive)

The alum is not super think but thick enough that it doesn't flex. Definitely not sheet metal. I don't know how to describe exactally. IF you were to hold a 4X8 sheet of it, it would be significantly thinner than a 1/4 plywood but would not flex in the middle.

The framing is a 1X2 box grid on the bottom side. Tig welded to top so it is all one piece. Very strong.

Good thing I kept with a somewhat retro look because it would definitely have gone through a few style cycles before I get it wet.

Meeting this Saturday for drinks ....looks like fat heads in Olmsted not sure time yet 440-476-4114

Where in Marblehead do you keep it?

Home
 

It is just in my garage out there. Johnson's Island.

Is there a velocity run this year? I'm a new owner to a 89 Steve Stepp 30 out of Monroe MI. Boat looks great. Getting ideas for the winter on mine.

How's it going? Any progress. I forwarded the link to this thread to Scott Smith (Putt-Putt). He said it looks great.