ryanmcclaran

I have a HP500 carb with a Blowershop 250 (4psi) and a demon carb in a 25 Daytona. I am wanting to put a different cam in it and run 5psi and not turn it over 5400rpm. Any ideas please let me know... Trying to hit 100mph....

getrdunn

What cam do you currently have? Also I would perhaps look into Mercs cam specs for the 600 sc and pulley accordingly. Their are a lot of Blower guys on the board and will hopefully answer your question a little better. Also PM Griff, he seems to be pretty blower savvy.

ryanmcclaran

here are my factory cam specs
Crane Gen VI#169611 Grind#HR-284-2S-10IG
Adv 284, 292 at .004” Lift with 1.7 .576 / .598
At .050” 222, 230
ICL 105, ECL 115
LSA 110

And if anybody knows where I can find the factory cam spec for the merc 600sci or the 700sci please send me the info or the link

Thanks

Griff

What speed and rpms are you at now????? A cam change and another 1 lb of boost may not be enough unless you are already in the upper 90's.

ryanmcclaran

it runs right at 90mph at 5200rpm on a stock 4blade 30. I want to upgrade my drive also and I have read that you can gain a few mph from a 1" shorty?? I have a really reliable boat but the motor has 400hrs so Im gonna have the heads done and I want to get some more power but still want the reliability...

Strip Poker 388

prob will be a custom grind to keep the peek at 5400,come on now just buz that thing,that wil get ya the 1 lb.

what size carb? Dom?

Rob

ryanmcclaran

its a 1090 King Demon Marine.

Strip Poker 388

cool

ezstriper

that does not look to be a good blower cam, need a wider lope seperation for the boost to work well, call Bob M.

Griff

You are definately going need more than a cam and a pound of boost. You will need about 150hp more to hit triple digits. Really, you need a better set of heads, cam and more boost.
I would do AFR aluminum heads, custom cam from rmbuilder, and up the boost to about 6#.