Go Back  Offshoreonly.com > Technical > Prop Talk
Scarab 300 help >

Scarab 300 help

Notices

Scarab 300 help

Thread Tools
 
Old 07-24-2014 | 08:34 PM
  #11  
cigboat1's Avatar
Registered
 
Joined: Aug 2007
Posts: 505
Likes: 5
From: Vermilion,Ohio
Default

Might be easier to find the cleavers or the mirages floating around also a lot cheaper ----I have a pair of 23 cleavers you can try on the boat but I do not want to sell them. have to dig them out from one of my old boats.... Call me if you want to try them out ------440-967-6683



Jim



The cleavers will give you more top end but they are tricky to come on plane some times.

Last edited by cigboat1; 07-24-2014 at 08:38 PM.
cigboat1 is offline  
Reply
Old 07-24-2014 | 08:48 PM
  #12  
SB
Registered
20 Year Member
 
Joined: Nov 2004
Posts: 14,104
Likes: 3,692
From: On A Dirt Floor
Default

Those motors are fine, but you must remember several things:

1) Your peak hp will be somewhere around 5500-5800rpm. The cam specs you gave are the Comp Magnum 280H Flat Tappet Hydraulics. Those where used millions of times back in the 80's + 90's. Not in boats much. Not that that means anything, but more that I and millions of other know where they perform up to.

I'd prop for 5400-5500 rpm first. And maybe try a little higher from there.

2) They are 350's. You have a heavy boat that sits/rides in the water a lot. Don't overload them, let them get to the rpm they make most power. They should start to sing nice from 4800rpm and up.
SB is offline  
Reply
Old 07-25-2014 | 09:30 AM
  #13  
Thread Starter
Registered
 
Joined: Jun 2012
Posts: 231
Likes: 0
From: Toledo, Oh
Default

Originally Posted by cigboat1
Might be easier to find the cleavers or the mirages floating around also a lot cheaper ----I have a pair of 23 cleavers you can try on the boat but I do not want to sell them. have to dig them out from one of my old boats.... Call me if you want to try them out ------440-967-6683



Jim



The cleavers will give you more top end but they are tricky to come on plane some times.
Thank you very much for your generosity, I will try to find a set I can buy first then go from there.
Baldie is offline  
Reply
Old 07-25-2014 | 09:31 AM
  #14  
Thread Starter
Registered
 
Joined: Jun 2012
Posts: 231
Likes: 0
From: Toledo, Oh
Default

Originally Posted by SB
Those motors are fine, but you must remember several things:

1) Your peak hp will be somewhere around 5500-5800rpm. The cam specs you gave are the Comp Magnum 280H Flat Tappet Hydraulics. Those where used millions of times back in the 80's + 90's. Not in boats much. Not that that means anything, but more that I and millions of other know where they perform up to.

I'd prop for 5400-5500 rpm first. And maybe try a little higher from there.

2) They are 350's. You have a heavy boat that sits/rides in the water a lot. Don't overload them, let them get to the rpm they make most power. They should start to sing nice from 4800rpm and up.
Yes, I understand most of that, as I can get the same speed out of the props that are on the boat at 4500rpm as I can with a true set of 25P mirages at 3200rpm, but it just seems that there is tons of stearn in the water right now - more than what there should be anyways.
Baldie is offline  
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.