articfriends

iTrader: (1)

StillHaulin,in no way were my coments directed towards you (although after re-reading my post it may appear that way). I'm not very familar with your hull as there are a ton of 24 and 25 outlaws,272's and a few 252's aroound here but no 232's so I have nothing to base a opinion on as to how fast your boat actually is,although based on its size I would expect it to be a few mph faster overall than the other boats I listed.What I was going off on a tangent about is I have read post after post in other threads where some guy has a 24,25 or 272 baja and it runs in the lower to mid 60's with a 502 and has it propped about the best its going to get then someone chimes in about how there bone stocker that is identical runs low 70's and the poor sob can't figure out how his boat could possible be 5-8 mph SLOWER when actually its not,thats all. A mid 60 mph baja with a 502 is very respectable for these hulls. I apologize if it seemed like it was meant towards you,it wasn't,Smitty

Kidnova

Speedometer and gps speeds can be worlds apart. My 80 MPH speedo is buried+ when my gps is reading 70 MPH.

I think the 20hp rule is really broad brush. I went from a 7.4/330 to a ZZ502/502. The 330 gave me about 56-57 MPH. ZZ502 gives me 68-69 MPH any day. Flat water about 68.5. 1-2 foor chop +,-70. Best so far is a tad over 73 on GPS cool dry day and 2.5 foot chop. So, the 20hp rule is not at all acurrate for all boats.

I'd guess LS1 would see 63-64 with a 502/415

cuda

My buddy had a 98 Outlaw with a 454/310. It ran 59 on gps. He put a privately made engine that was supposedly built to 500 hp specs, and it ran a touch above 70. I know that because I was running beside him in my Formula, and had my gps on. He had nothing but trouble with that engine, had to tear it down at least twice, then ended up selling the whole thing, and took quite a beating on it. He's an outboard guy now.

He should have stayed with the 454, it ran everyday the summer he bought it with not one whit of trouble, then lost a whole summer of boating with the bigger engine.

mats

I made that same upgrade on the same boat, a 1988 Baja 235 Force. With the 7.4L, 300 pshp it made 55 on GPS. Same boat with a 502 MPI, 415 pshp it makes 60 on GPS,. I think I have seen 62 running on fumes.

If I remember it correctly, another colleague here, baddog, made a post about a similar upgrade. Same boat, made 58 on speedo with the 7.4L and 68 on GPS with a stock 502 cratemotor with maybe 425 hp, unclear if it was prop or crank hp.

Interesting difference, can´t really explain it. However, I do have some layers of bottom paint on it.

BadDog

Mats, stock wore out 330 in my Force 235 was 57/58 on a good day. Crate motor 502 with stock exhaust and single plane intake 66/67. Added headers and prop tweaking got 67/68 everyday. Added B&M 250 got 80. The hull is what was limiting me. The faster it went the more the bow sank so speed was really depended upon water conditions and wind to carry the bow.

Budman has a Force 235 and never quite got the speeds I got with but his is an 89 we suspect some differences in the lamination schedule making his bow heavier. Unclear what HP Budmans Force has. He did have the hooks shaved off but at 60 it does not seem they came into play a great deal. Again the props ability to carry the bow on those hulls is the key. You really have finesse the trim on that hull. Sort of over trim to get the RPM up then lean it over just a touch and straighten it back up. Then trim down to get a bit more bite, this has the effect of setting it up on the pad just a bit.

bcarpman

Yep, I know everyone always likes to come up with simple rules-of-thumb for everything, but like someone once said "For every complicated problem there is a solution that is simple, direct, understandable, and WRONG."

The big factor here that makes the 1mph = 20hp irrelevant is what HP level you are at. In a 4000lb average V-bottom if you are starting at 250 shaft HP (worn out 330) 1mph only requires 9hp. If you've already got 400hp, 1mph requires 12hp. At 600hp 1mph requires 14hp.

However, in a 10,000lb boat at 1200hp, 1mph requires 31HP.

Think of the extreme example of a small fishing boat with a 10 hp trolling motor. Don't tell me it takes anywhere NEAR 20hp to pick up 1mph.

Back to the original question: From what I've heard, most 330's came from the factory with around 285 pshp. Assuming a loaded weight of 4350lbs we calculate a hual constant of 220. If the new motor has 415pshp the new combination should run 68 mph proped right. If the new motor has 415 crank shaft hp, the new combination will run 65mph PROPERLY setup (big if)

StillHaulin@63

Smitty
Gladly Accepted ..... and Thank You.
I too regret my overreaction and got a bit carried away.

It just seems that many in OSO have decided that in lieu of simply sharing their wealth of knowledge with those would like to learn more, they have decided to become the offshore "world police" and demand that, unless they have personal knowledge the information posted, it just cannot be true.

It gets a bit annoying when wanting to share what you have learned for others to consider, you are immediately branded as a liar and "uneducated" in performance boating by those considering themselves as "holier than thou"!

Bill

Kidnova

StillHaulin - It does seem to get a bit pissy at times does it not? But I figure it this way...without hearing a tone of voice, seeing a facial expression, or body language, sometimes it can be difficult to understand exactly how someone means to come across. I'm a tad hot headed sometimes, so now I try and remember to count to 10 And keep my big mouth shut

StillHaulin@63

It does, and sometimes we get too involved!
My problem is ... that as we get older ... it's harder to keep our mouths shut

kennyo

I've found that I have to really try hard to sound like a smartass when i write something, when it seems to come so natural in person.