Update...

Turned them in and gained 2 mph.

Motors are turning right around 5k, one slightly under and one slightly over. Had similar conditions, 1' to 2' chop, and 2 aboard, with a little more fuel.

Come on fall weather... I think some cooler temps and it'll push 80.

http://i215.photobucket.com/albums/c...er99/JZ-79.jpg

Not a stupid question at all. Bravo pitch is overstated generally by 2". As I recall the explanation, Merc Bravo rates the MAXIMUM pitch (as it varies within the blade) compared to Hydro and most ever other prop is rated at the AVERAGE pitch.

Sweet:thankyouthankyou:

Steve Stepp & Velocity Pad This was in a 320 Velocity. The boat had more but I didn't.:lolhit:

Labbing the 30's would be quicker then 28's and probably just as much as purchasing a pair would it not?

I sent BBlades a message and am waiting to hear. I don't want to weaken the props too much, if that's even possible, but I'd like to spin them like the 28's and drop my slip into the 5-8% range from the 11% it's currently at.

I used to drive at 3% slip with these drives and engines in an old chris craft and mirage plus'.

I can only wait and see what he says, maybe my goals are just unrealistic.

Any dancing or chine walkin? Mine was a different boat spinning in w/shortys. And just dump your passengers out at the sandbar and run 80:)

Boat handled great! From the old 26's to brand new 28's from Todd was a night and day. I think the full 15-1/2" diameter made all the difference.

I still have one motor tgat is lagging behind 200-300 rpm's so I think once I get that figured out it will definitely break 80.

Stay tuned. ;)

Couple things... Are your engines getting enough air? That engine cover looks pretty well sealed up. Most of the real fast ones have scoops / big air.

Also, can you give some specs on the small blocks? I'm planning a pair in the spring. Dart blocks, dart alum heads, air gaps, 10.5:1....

What exhaust do you have? Carbs? Especially cam. If this is too off topic, you can reply to my 30' redo thread.

Hoping the elusive 80 make is yours!

Air intake was overlooked on my old 30. I got more air into it and got 600-800 rpm. The vents on the side were just not enough. Stick a 2x4 in the hatch, tie it down and go for a rip. Love those 30's!

Mine is stock big blocks. Just a pair of plain ol' 502 MPI's. Stock exhaust too. Kings has the small blocks. I agree with the lack of air though. I had mine vapor lock this weekend at our lunch stop, and my 502's have the later style cool fuel too.

Been watching your posts/pics. This hull is a great design and a blast to drive. Good luck with your project!

Sorry, miss read the small block part.

I like the previous cheap 2x4 idea to test air situation. Learned about the air at the race track. We simply sealed the scoop to carb and improved times by more than the previous thousands spent in upgrades. I will have foam seals between scoops and carbs. If you think about it. You are sucking hot engine room air into motors.

I got my scoops from Teague today (ironically).

Lightning Headers
 

Here is a pic of the new headers. They look great. It isn't clear to me what finishes the tails where the go through the transom....

https://sites.google.com/site/mitche...=238&width=320

Looks nice! This is how my stainless marine's were finished. The tails went through the hull and it had a rubber gasket and polished trim ring.

http://i215.photobucket.com/albums/c...a/IMG_0121.jpg

Trim rings
 

I think this is what I need but the tails are 6" and I haven't seen any. May have to fab them.

Anybody put trannies. In. This. Hull? Kinda. Nice. It does. 70. Stock. With About. 100hp loss. Without. Headers. On. Forged. 454. Mags.
Or would it. Run. Right. If. I. Attempted. To. Drill. The. Stringers. Smoke

Good looking. Hull. Really. Still
Open. Up the. Heads. And. Cams. So. A. 454. Can. Breath

Kinda. Nice. To. Keep. The. Hp down. Which. Keeps. Fuel. Down

I picked up a 30' velocity this fall, only got it out twice befor my ramp was out of water. It's got mildly built 502's, spinning 28 4 blades, 5500 Rpms and best run was 83.1. It's a handful to drive, pretty scared of it... I don't like the R's so high, I'm gonna try 30's in spring and hope to be down by the 5000-5100 range, and Maby pick up a mph or 2... That and the engines were built from scratch with worked carbs, previous owner pulled those and put on regular holleys with chokes because he said they were too cold blooded... Gonna try those and the 30's and hope for a few more mph and less R's..

I'm running 84 w/28s at 5300 80 at about 5k

thats sweet!!! these are great boats! i was specifically shopping for a 30 last year,( 2nd choice was a 95-newer 280, but the ones i liked were outa my price range) im getting anxious to get mine back out!

What type of 28's? Are they spinning in or out? Do you have external hydraulic steering? If not, and your gimbal pins are loose, this will greatly affect handling.

Some things that helped mine when I first got it, was to check the toe on the drives, check the accuracy of the indicators for both the drives and the tabs, and make sure they are the same from side to side.

The drives at the back should be about an 1/8" closer than at the front. Mine were way out when I got it, I ended up adjust about 3/8" of an inch or better.

I also keep my tabs around 3 which is neutral to the bottom of the boat...much higher and it wants to porpoise.

If it starts to chine walk too bad, back off and start over. These boats are a blast to drive, and remind me so much of my Allison.

With the few small adjustments I've made over the winter, I hope to break the 80 mark, with these stock 502's.

They are 28p 4 blade bravo one's, I have them turning in, when I picked the boat up they were turning out, picked up 2 mph switching it.. I have full hydro steering, and gimbles have 150 hours on them. They are tight, I never checked the toe in tho.? When I say it's a handful I don't necessarily think anything is wrong, it's just it takes alot more "driving" then any other LIL single iv owned in the past.. It feels alot like my friends 320, and like you said, too much tab or trim and it gets loose gotta start over, that's how I felt driving it last year.. I'm sure ill get the hang of it..! I hope,! But I am looking for some inside on props.? I don't like pushing the engins that high at all, and want to go bigger props, but not sure how big, labbed or not, or bravo or hydro.?

Tears ago, when I told Steve that my 30 chine walked badly. He admonished me and told me to work the wheel back and forth just a little to keep it on the pad. It worked. If you have full hydraulic steering its hard. Power is best. Either way those boats teach you how to drive.

I'm running a set of 28" Hydro's right out of the box. Many say the Hydro's are a little more stiff than stock bravos so it might be worth a shot to try a set of 28 Hydro's before buying. Also Steve says the Hydro's run the best on these 30's.

I'm turning right around 5000-5100 and its a few tenths from 80.