regalman4925

i have been researching this and decided i would stir up a little ruckus, this is one of those subjects... a little background on my boat, i have a 1989 baja sport 250, 27' with the palteform. i am running a very modified 1998 330 base motor that is guessed to be around 450hp. the previous owner said the boat ran 60ish at 5000 rpm with the stock 1989 330. with all of teh performance stuff i have added i am still running 5000rpm and 60ish on gps with the same 23 pitch mirage prop. i repalced teh old lower unit that had corrosion issues with a newer style lower that happened to come with a nose cone already attached to it. i am not too worried about speed gains with the nose cone, im wondering if it may play a factor in why i am not gaining speed and rpms. i would like to keep it on there if it is not hurting anything but if it is dragging my speed down then its coming off.

Griff

There is no way the boat ran 60mph with a 330hp to start with. More like 56-57. My 24 Outlaw ran 60-61 with a stock 454mag and labbed 23 Mirage plus.
Nose cones really don't help anything until you are over 80. You may have the older style lower, so it may help at 70+.
Nose cones can also slow you down when not needed. I took one off my 28 Pantera and got better bow lift.

regalman4925

well considering it had a good ol water pick up speedo i am assuming a few mph off is a safe assumption. most people dont have gps speedos in their boats. my question is should i bust the thing off of there or is it not hurting me? hopefully by this time next year i am building my 540 so if it is gonna benifit me in the future then i will leave it on.

A.O. Razor

Griff is right, nosecones are usually adding drag. They are only usefull with high x-dim drives and on fast boats where the standard lower is experiencing blow out, due to speed. Why would you leave it on? Looks? There is a big chance that it scrubs speed and mess with the handeling of the boat. Personally I'd remove it, clean up, prime and paint the lower. The Bravo lowers are not a bad design, so usually nosecones are only needed for the before mentioned reasons. This is also why I'd like it if you cuold buy a shortie with standard shape lower. You could buy a used one without it, and sell the one that works the worst.

endeavour32

iTrader: (4)

What kind of exhaust are you running. If your running the stock junk, there is your speed issue!

regalman4925

honeslty i am not argueing either to keep it or not keep it. if it is not hurting me i see no reason to remove it, if it is i am taking it off.

i have gils with hp500 pipes on them, crane 731 cam, air gap performaer intake 750 pro form carb. just to name a little bit of it

fleg1

Is that enough carb for that motor? Did you dyno the engine?

regalman4925

no dyno. i called barry grant and holley and they both recomended a 750, a hp500 which is a 502 runs a 800 so it seems right.

endeavour32

iTrader: (4)

If it were me I would knock off the nose cone. If its doing anything, its slowing you down. Then I would try a 21 pitch Mirage Plus. Your set up sounds similar to my Formula 242. I think you're out of the RPM range of your cam. Try and get it closer to 54-5500 WTO. What do you think Griff, I think your familiar with this cam. As far as the Carb goes, I think an 800 would be better but the 750 will work. Remember the HP 500 uses a single plane and your using a dual plane. Dual Planes require a larger carb.

BDiggity

Damn wish i would have known nose cones no good before i had my trs's painted. i would have had them remove.