thisistank

It's on video.

Uncle Dave

That boat should be faster than that with that many beans in it, but Dynos are all different. At the same time the sportmaster lower "cost" my tunnel hull 4MPH compared to the original B1 lower.

An engine on a dyno pushing through car headers usually makes more power than it will in the boat with a marine exhaust- and Ive seen so many dyno cheats to sell a build it's ridiculous- not making any speculation about your guy just telling you what Ive seen.

(when I went to Edelbrock they actually had the room pressurized-! I had to lean my shoulder on the door to get in the room!)

Comparatively the LaveyCraft 39 Evo runs about 105 with 700's and NXT drives. Its probably a lighter boat but not enough to overcome a 2-400HP difference in power and you know it doesn't have a pony more in it or Mercury would name it - the 701

Sorry about your drive problems- that sux.

Video is crappy so switch to high quality and forward to about 20 seconds in.
http://www.youtube.com/watch?v=6NVpj09ejnk

Uncle Dave

LaveyCraft 2750 Ilmor 710
LaveyCraft 20.8 406 SB

Uncle Dave

I see what looks like a CMI elbow top in the dyno room shot- and when I look at the dyno chart I dont see a correction factor on the printout, and that can swing a number a long way - but it sure looks like the guy set up the dyno and ran the marine exhaust.

Uncle Dave

LaveyCraft 2750 Ilmor 710
LaveyCraft 20.8 406 SB

Sean H

you must not deal with mercs too often, 525's make around 560-580, 850's are around 920 and 1075's are pushing 1125-1140.... i would estimate that a merc 700 makes that at the propshaft, easy. merc has a bad habit of under rating thier power levels, but none of that is really the issue here.

and i think Rik solved their drive problems.

getchasum111

the 39 is 8 inces longer to alow a staggered engine set up

Uncle Dave

Actually Ive been buying and using mercury products all my life.

Accepted testing sources that Mercury themselves do not dispute do not back your claim- note the enclosed document.

A 525 makes about 470 propshaft horsepower and the newer blower engines are electronically "bled" or timing retarded- to keep them at that level of power at sea level or altitude -claimed ( for insurance purposes)

Take a look at a series of comprehensive tests by several major magazines and note how when a mercury engine is tested they indicate what boat has in the way of propshaft horsepower instead of whats stamped on the Engine. Custom engines are quoted dyno HP.

My latest purchase is my first new non merc setup Ive bought however- Ive switched to Ilmor and you can look at my 2750 in the Laveycraft forum.

Please post any real comprehensive 3rd party data you have backing up your claim- Id like to see it.

"Because you said so" carries no weight.

Uncle Dave

LaveyCraft 2750 Ilmor 710
LaveyCraft 20.8 406 SB

blume

one of the best running 2003 model 38' Top Guns that I have been in was a 675hp KE motors, Stelling extension boxes, XR uppers and Imco -2" lowers, 1.50 gears and 102mph with 2 fat guys and 3/4 fuel.

Rik

I know. My point is that happened last year sometime so it happened before I was involved with them so I don't have the details of what caused it rather they sent me the video of when it well after it happened.

Rik

They are very very happy. They lowered the HP to make the engines live and they did not loose any speed.

They have kissed their drive problems good bye!

Dunarunner

I suppose if you are going to reach those sort of speeds with this sort of set-up problems can occur. Reliability of the engines and Drive breakages being the norm I assume are minor in comparison to being ejected from the boat at low speed ! Just my 0.2c
The boat accident was this summer in July. and since then has been re-built with new arnesons and the same engine package......
Duna