Only Getting 4k RPM

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09-04-2012 | 01:55 PM

#11

Muscar311

Registered User

Joined: Nov 2010

Posts: 27

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From: Balto, Md

By the way 365hp and the 420hp - has square port heads with Alium. Manifolds. If someone had switched motors and put the Alium. manifold on the peanut heads, your boat wouldn't run for ***

09-04-2012 | 07:04 PM

#12

Dtile

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Joined: Sep 2004

Posts: 497

Likes: 0

From: Tarpon Springs, FL Winter/LBI, NJ Summers

Quote:

Originally Posted by Muscar311

I think your boat is right on. your in fresh water in a 311 SR1. The 25 will give you a better mid speed and less top end. 23's will give you more RPM and speed. A 4 blade (24) will give you even better mid but is hard on the drive if your jumping waves. My boat with dinged up 23's and 330hp 4400 and 62MPH But 65 in rough water. Small point -- salt water is faster then Fresh

Salt faster than fresh? Guess you don't have tides then...I lose sometimes 5 miles an hour in tidal waters even in slack tide...the post's a year old...wonder how he made out?

09-04-2012 | 07:05 PM

#13

Dtile

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Joined: Sep 2004

Posts: 497

Likes: 0

From: Tarpon Springs, FL Winter/LBI, NJ Summers

Quote:

Originally Posted by Muscar311

By the way 365hp and the 420hp - has square port heads with Alium. Manifolds. If someone had switched motors and put the Alium. manifold on the peanut heads, your boat wouldn't run for ***

"365hp and the 420hp" peanut heads???????

09-04-2012 | 08:50 PM

#14

jiffy292

Gold Member

Joined: Jun 2009

Posts: 546

Likes: 3

From: Ma

That setup will never turn a 25 plus thats basically a 27 p prop. Try a set of 25 mirage non plus and start from there.

09-04-2012 | 08:52 PM

#15

jiffy292

Gold Member

Joined: Jun 2009

Posts: 546

Likes: 3

From: Ma

Salt more bouyant than fresh. It is faster

09-04-2012 | 11:26 PM

#16

bunky1957

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Joined: Jul 2010

Posts: 122

Likes: 6

From: northern nj

My 311 with mags will turn a 25 pitch Mirage (not Plus) 4900 rpm and 68 Gps. Motors are stock except for Gil manifolds. Speeds are in salt water with slight chop.