Extension Box and Shortie on a 26 Scarab???
11-18-2010, 11:18 AM
#2
Registered
The thing you want to do first is find out how deep your drive sits in the water. Measure the distance from the bottom of the boat to the propshaft centerline. If it is deep (7 or 8") raising it up would help the speed. My boat used to be at 8" and I raised the engine and drive up 3", now the prop is 5" deep. The boat handles better and runs flatter and faster.
11-19-2010, 03:02 PM
#3
Registered
Thread Starter
Join Date: Jan 2009
Location: TEXAS
Posts: 265
Likes: 0
Received 0 Likes
on
0 Posts
The thing you want to do first is find out how deep your drive sits in the water. Measure the distance from the bottom of the boat to the propshaft centerline. If it is deep (7 or 8") raising it up would help the speed. My boat used to be at 8" and I raised the engine and drive up 3", now the prop is 5" deep. The boat handles better and runs flatter and faster.
11-19-2010, 08:58 PM
#4
RIPSTA Racing Team
VIP Member
An Imco box is going to raise you up 3" and your gonna have to raise your engine up as well due to the straight shaft the Imco set up uses. A Stellings box which is adjustable in height even raises the X up 7/8" in the neutral position but uses a shaft system to connect to the engine. If I was you I would forget the box and all the work that comes with it and try the shorty lower by itself. Try a -2 and if it's too much you can space it back down 1/2" at a time. My 2ct's
11-19-2010, 09:07 PM
#5
Registered
Join Date: Apr 2005
Location: www.bajaboatowners.com
Posts: 2,957
Likes: 0
Received 1 Like
on
1 Post
Imco makes a neutral box depending on angle of transom if it's equal deeper or higher. Mine raised me a inch. I gain 3" by box and shorty. Tremendous improvement in handling and ride.
11-19-2010, 10:50 PM
#6
Registered
Join Date: Feb 2002
Location: Lake Michigan
Posts: 6,627
Likes: 0
Received 0 Likes
on
0 Posts
I agree with fireboatpilot with trying the shortie lower by itself first. If you have Hyd. steering its going to start costing you going to a box.
Last edited by Back4More; 11-19-2010 at 10:54 PM.
11-21-2010, 01:26 PM
#7
Registered
Join Date: Dec 2000
Location: EASTON MA.
Posts: 6,281
Likes: 0
Received 0 Likes
on
0 Posts
An Imco box is going to raise you up 3" and your gonna have to raise your engine up as well due to the straight shaft the Imco set up uses. A Stellings box which is adjustable in height even raises the X up 7/8" in the neutral position but uses a shaft system to connect to the engine. If I was you I would forget the box and all the work that comes with it and try the shorty lower by itself. Try a -2 and if it's too much you can space it back down 1/2" at a time. My 2ct's
11-22-2010, 10:37 AM
#9
Registered
Thread Starter
Join Date: Jan 2009
Location: TEXAS
Posts: 265
Likes: 0
Received 0 Likes
on
0 Posts
I agree with you, I used a 2'' shortie worked great with it and a carb change I pick up 8mph maybe more but drive was stolen. boxer just put a 2'' shortie on his with a 1'' spacer he went from 4 3/8'' to 3 3/8'' his boat a 31 single sutphen picked up 3 or 4 mph and better ride leveled the boat with the longer nose of the imco.the boats that run near 80 or above pick up more speed it seems. what hp do you have maybe bring it up a little too.
Last edited by goebel1; 11-22-2010 at 10:40 AM.
