Prop experts ideas

custom29scarab · 07-14-2005, 08:15 AM

I have a 29 scarab 1996 single screw.
I have 470hp.
Bravo I with 1.5:1 gears
running a 23 mirage plus at 4900rpm 61 on gps wot
what can I do to get more top end

throttleup · 07-14-2005, 12:31 PM

At what RPM is the 470 HP produced?

What size motor do you have?

Julie

custom29scarab · 07-14-2005, 12:57 PM

I haven't had it on the dyno yet just got the boat.
It is a 502 block.
All custom made. 850 holley,edelbroack square intakes, aluminum crane roller rockers, alm. covers and CMI elbow exhaust. I am estimating the 470 could be more or LESS! I wasa told it has a stock 502 cam?????

throttleup · 07-14-2005, 01:08 PM

We will need to know were the peak HP is produced to prop you correctly. Either by Dyno or an expert guestimation.

Julie

custom29scarab · 07-14-2005, 01:33 PM

OK I will get back to you with that info.
thanks
Bill

bbladesprops · 07-15-2005, 12:11 PM

Your engine configuration tells us your more than likely low on your current WOT. If you can't get the exact dyno sheet, I would prop the boat in the low 5000's.

Lab Finishing your current propeller will get you there.

tssteph · 07-15-2005, 01:19 PM

I met a guy two weekends ago with a 1994 29 with a 502/502 GM crate motor that ran 67 on the GPS if that helps(so he said). I was under the impression that a single engine 29 scarab would run 64-65 stock. Something does not seem right in your numbers. I wounder if the tac is right. Also are these fully trimmed numbers? Mine requires a ton of trim for top speed but I also have twin 350's.