OutDrive, Prop, HP Questions

R

Roman S

Petty Officer 2nd Class
Joined
Aug 1, 2007
Messages
105
Hi, Happy New Year,
Two Questions, bear with me. Will be removing the Alpha one outdrive so I canw ork on the engine. Is it advisable to perhaps stick a couple of rags in the open hole while the outdrive is out? It will be out for a couple of months. When I am finished with the 350 5.7 L engine work I will have 30 to 40 more horses. Will I need to get a bigger prop to handle the extra HP.
Thanks Roman
 
Don S

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: OutDrive, Prop, HP Questions

Is it advisable to perhaps stick a couple of rags in the open hole while the outdrive is out?
Click to expand...
It won't hurt to protect things

When I am finished with the 350 5.7 L engine work I will have 30 to 40 more horses. Will I need to get a bigger prop to handle the extra HP.
Click to expand...

Possibly, run it and check your WOT (Wide Open Throttle) rpm, that is what determines which prop you need.
 
T

TilliamWe

Banned
Joined
Dec 21, 2004
Messages
6,579
Re: OutDrive, Prop, HP Questions

Search on here or at another boat products site for a "Stern Drive Cover" from Stor-It. It's a plastic cover, with a gasket and bracket that bolts on in place of the drive and can support the trim rams too. About $15 plus shipping. Looks better than a cardboard cut out or rags stuffed in it.
 
wire2

wire2

Lieutenant Commander
Joined
Jun 25, 2007
Messages
1,584
Re: OutDrive, Prop, HP Questions

What was your wot rpm before? If it was close to max already, additional hp will put you over. If well under, you'll be ok with present prop.
 
R

Roman S

Petty Officer 2nd Class
Joined
Aug 1, 2007
Messages
105
Re: OutDrive, Prop, HP Questions

My WOT is perfect right now. The boat was propped as when it was first biult in 1987, a Regal. However, with a new engine and a 30 to 40 more horses pushing in the back, it might need a bigger prop. Might?
 
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