H.P to Speeds

HIGH LIFE · 07-13-2009, 10:01 PM

Can anyone estimate I/O H.P. to run 65--70--75 in a MAGNUM SEDAN ? App. weight that I have found is 5,400# . Thanks in advance.......HIGH LIFE

Fast Shafts · 07-14-2009, 12:18 AM

For what its worth, I used to race a 28 Pantera with an HP 500, it was 5300 lbs and it ran exactly 70mph. I would guess 575 to get to 75mph.

27sedan · 07-14-2009, 12:45 PM

I have twin 350 mags w/250pshp.
I have always run a solid 65 on radar.
another 100 hp per side should do it.

h2oboater · 07-14-2009, 01:54 PM

Quote:

Originally Posted by HIGH LIFE

Can anyone estimate I/O H.P. to run 65--70--75 in a MAGNUM SEDAN ? App. weight that I have found is 5,400# . Thanks in advance.......HIGH LIFE

What drive, Merc or Volvo. With 300 hp, Merc Trs 65mph, Volvo 60 to 62mph.

24degrees · 07-14-2009, 11:23 PM

Twin 320 EFIs and Bravos....66mph on GPS with bottom paint.

hallj · 07-17-2009, 12:46 PM

Quote:

Originally Posted by 24degrees

Twin 320 EFIs and Bravos....66mph on GPS with bottom paint.

Last time, you said it was 67 something.............

HIGH LIFE · 07-17-2009, 07:32 PM

The reason I asked the question was to compare I/O to O/B power. For the last couple of years I was running '98 Merc Pro Max 300's, I just bought 4- Merc Pro Max 300X 2003year w/ Sportmaster L/U w/ 1.25" shafts. Only installing 2, selling the other 2. With the 300's boat ran 71GPS @ 6,100RPM, the X motors run up to 6,800 RPM. Have not run boat yet, delays were one thing after another!!! Will keep updates as thing progress. HIGH LIFE