Re: this really sucks?
 

Without knowing exactly what's in your engines, it's really hard to pinpoint the hp you SHOULD be making. But, nevertheless, you should be running faster even with a stock setup. You're just not making any more power than you were before.

Time to start doublechecking EVERYTHING. Your manifold is'nt helping your situation, but I'm sure that's not your main problem.
What does your engine builder say? He should be making some changes to improve your speeds. He's the one that knows what he put in the engines and how everything was installed.
Did you take any plug readings?
Where's your total advance at?
Take the chip out of your revlimiters and try it that way.
I doubt both chips are bad, but that'll eliminate that idea.
Where were the cams installed at? Possibly maybe too much advance, or retard.
What roller lifters are you using? Some styles are designed to be set at 0 plus a half a turn, some are designed to be set at 0 to -.004 If you don't have the lifters set properly, you could be not letting the valves close all the way, and therefore you'll be losing a considerable amout of power at the top end.

I'm sure it's just something real simple that might've been overlooked during assembly, but it's something that's been done to both engines unknowingly.

Re: this really sucks?
 

Briana - talked to Chris at Fountain this week. They didn't have my hull number with the x dimension, however, he said the boat made right after mine had 16 3/4. So he thinks mine shoul be the same. No wonder these new executioneers are running near 80 with the x-dim. at 19. This is why I think that i would benefit from a 2" shortie.

Re: this really sucks?
 

If you are spinning the same 26" props at the same 5000rpm at both before and after the change, you should have the exact same speed to the 1/1000th. Doesn't matter if you have 5 HP or 2000HP. The design of all the parts you put in, heads, exhaust, whatever...was not the cause of your 2mpg gain. You gained the speed from either a loss of weight from the new parts, or the temp/water conditions were different between the 2 runs.

I suggest trying a set of smaller props to check that you can spin the motors faster. If you can, then you don't have the HP to spin 30" props, try 28".

Re: this really sucks?
 

briana - were you over @ Rumrunners on Thursday? I was down on vacation in Ft Myers Beach this past week.

Re: this really sucks?
 

no, was at snug harbour, on fort myers beach last sunday, was over at rumrunners today saturday.

Re: this really sucks?
 

us1 fountain, i always thaught more horsepower, more prop,
now that the motors are set up to run more rpm 5700 rev limiter. do you thing my missing speed increase is somewhere between 5000rpm and 5500 rpms, maybe run 24 bravos, or 22 hydros.

Re: this really sucks?
 

Yes, more HP means you should be able to turn a larger pitched prop. A larger prop will move further forward for each revolution than a smaller prop. BUT, you have to have the HP to turn it. Since you were able to turn the 26" before @5000rpm, you should be able to go up, such as a 28" now that you have more HP. But you have acheived ZERO rpm gains. Are you sure your rev limiters have been increased? The reason we all suggest trying smaller props, 22,24" is to make sure your motors can and will indeed spin more than the 5000rpm you are currently getting. This is the quickest/easiest check if you have access to a couple smaller props. If you can then spin say up to 5400, then we know A) that your rev limiters are not holding you back, B) you need to look at your motor work. I'm just surprised that both motors are on the same playing feild.

Re: this really sucks?
 

well, enough of this crap, just talked to the guys at innovation marine in sarasota, and they are getting me on the dyno schedule within the month and well then see what is going on.

Re: this really sucks?
 

what is the lift and duration on the cam?

Re: this really sucks?
 

i hate tio admit this!!!
dont spend money on old technology!!!
i had early 90's 35 i spent a mint on it,, STUPID!!
Just buy a bout that runs what you want it will be cheaper..
to get my old boat to go what my new boat does i would have had to insert it into the space shuttle.. : )
no but really it makes no sense throwing good money after bad i lost my azz.. just upgrade your program and you will have reale and more fun,, my 02