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gbuilder

04-25-2009 12:36 PM

prop questions 272 twin 350's

hey guys i have two new 350 mags and alpha drives on my 1988 272. i have 21 pitch props and i'm not getting more than 52mph, could i get some help?

formula 382 sr-1

04-25-2009 01:54 PM

Quote:

Originally Posted by gbuilder (Post 2852501)

hey guys i have two new 350 mags and alpha drives on my 1988 272. i have 21 pitch props and i'm not getting more than 52mph, could i get some help?

What are the RPM's at WOT ?

gbuilder

04-25-2009 08:06 PM

i'm running about 4900 rpms

FIXX	04-25-2009 08:09 PM

mrfixxall

Quote:

Originally Posted by gbuilder (Post 2852501)

hey guys i have two new 350 mags and alpha drives on my 1988 272. i have 21 pitch props and i'm not getting more than 52mph, could i get some help?

are their vent hole in the props? gps speeds? that boat should have 23 p props on it...

formula 382 sr-1

04-26-2009 12:51 AM

1 Attachment(s)

Quote:

Originally Posted by mrfixxall (Post 2852613)

are their vent hole in the props? gps speeds? that boat should have 23 p props on it...

Ours came with 21's cleavers . Put 383's @ 425 hp and 23's and turned them at 5200rpm 69.9 on gps.

Car Biz

04-27-2009 08:41 AM

Quote:

Originally Posted by mrfixxall (Post 2852613)

are their vent hole in the props? gps speeds? that boat should have 23 p props on it...

Yup my 272 i had i tried 21 Mirage and a 23 Mirage back to back. 59.9999 GPS with the 23's and 39 MPH cruise @3400. I lost 3 MPH with the 21's cruising and 2 MPH on the top side. Only mods were timing locked at 34 MSD coils and K&N flame arrestors. Top end RPMS were 4800

Slick02

04-27-2009 09:28 AM

My 89 272 with 420's(came with 365's in it and had problems the second week out) and Bravo's had 23 mirages on it and at 5200 it was running just about 72 mph(in 3 ft seas)..God I miss that boat.

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