Go Back  Offshoreonly.com > Technical > General Q & A
Twin engine question >

Twin engine question

Notices

Twin engine question

Thread Tools
 
Old 02-01-2019 | 07:18 PM
  #11  
Registered
15 Year Member
 
Joined: Feb 2009
Posts: 8,356
Likes: 1,515
From: NW Michigan
Default

Just an FYI. His boat won't go in circles if your wondering. lol
getrdunn is offline  
Reply
Old 02-02-2019 | 07:42 AM
  #12  
Thread Starter
Registered
20 Year Member
 
Joined: Jan 2005
Posts: 4,822
Likes: 376
From: IL
Default

Originally Posted by getrdunn
Just an FYI. His boat won't go in circles if your wondering. lol
lol
boatnt is offline  
Reply
Old 02-02-2019 | 10:24 AM
  #13  
Registered
15 Year Member
 
Joined: Feb 2009
Posts: 8,356
Likes: 1,515
From: NW Michigan
Default

Originally Posted by boatnt
lol
I couldn't help it. I use to always concern myself with "identical" twins but realized their rarely identical anyway. Some cases you can dyno two of the same exact builds and be off 10-15 hp at any given rpm. Have him refresh the ugly ginger and be good to go. Like rookie said it would be a plus to be on the power steering side. I would imagine he will be doing a complete refresh including valvetrain inspection etc. As long as it's out might as well give it a complete bill of health.

Maybe pull its mate mate next season and refresh. Did he mention the hours by chance?
getrdunn is offline  
Reply
Old 02-03-2019 | 07:54 AM
  #14  
Registered
 
Joined: Nov 2005
Posts: 4,554
Likes: 3
From: Fredericksburg, Va
Default

Originally Posted by f_inscreenname
Had a Jasper motor that had 3 different size pistons in it. Really pissed me off trying to do a refresh.
years ago jasper was good..then they turned to crap..and I mean crap,had a engine few years back acted like blew a head gasket, pulled it down to find they had welded the head in the combustion chamber and weld came out ! Talked with jasper and was told they have to use about everything they get back due to availability on cores, stopped used them.
ezstriper is offline  
Reply
Old 02-03-2019 | 11:48 AM
  #15  
Registered
 
Joined: Jan 2005
Posts: 3,570
Likes: 127
From: Pasadena, MD
Default

Originally Posted by ezstriper
years ago jasper was good..then they turned to crap..and I mean crap,had a engine few years back acted like blew a head gasket, pulled it down to find they had welded the head in the combustion chamber and weld came out ! Talked with jasper and was told they have to use about everything they get back due to availability on cores, stopped used them.
Mine came with a boat I bought. The seller pointed out the tag on the motor "Jasper" as a selling point. The boat was a wreck and I got it for a song anyway but was shocked on how a simple refresh turned into a nightmare.
f_inscreenname is offline  
Reply
Old 02-05-2019 | 05:15 AM
  #16  
Full Force's Avatar
Gold Member
20 Year Member
Gold Member
 
Joined: Oct 2005
Posts: 11,688
Likes: 216
From: Olmsted Falls,Ohio Marblehead,Oh
Default

Sleeve it, then they will be the same.... cheap to do..
Full Force is offline  
Reply
Old 02-05-2019 | 05:17 AM
  #17  
Full Force's Avatar
Gold Member
20 Year Member
Gold Member
 
Joined: Oct 2005
Posts: 11,688
Likes: 216
From: Olmsted Falls,Ohio Marblehead,Oh
Default

Originally Posted by getrdunn


I couldn't help it. I use to always concern myself with "identical" twins but realized their rarely identical anyway. Some cases you can dyno two of the same exact builds and be off 10-15 hp at any given rpm. Have him refresh the ugly ginger and be good to go. Like rookie said it would be a plus to be on the power steering side. I would imagine he will be doing a complete refresh including valvetrain inspection etc. As long as it's out might as well give it a complete bill of health.

Maybe pull its mate mate next season and refresh. Did he mention the hours by chance?
if built right they will be the same, my Mistress engines were 1HP and 3ft lbs apart.. same dyno, same day.
Full Force is offline  
Reply
Old 02-05-2019 | 08:50 AM
  #18  
Thread Starter
Registered
20 Year Member
 
Joined: Jan 2005
Posts: 4,822
Likes: 376
From: IL
Default

Originally Posted by Full Force
Sleeve it, then they will be the same.... cheap to do..
Yep already done that, but unfortunately when you sleeve a cylinder you take the chance of distorting the cylinders next to it and in this case it did ,so That is the reason I’m thinking about boring it so I don’t keep repeating the sleeving process
boatnt is offline  
Reply
Old 02-05-2019 | 09:16 AM
  #19  
Knot 4 Me's Avatar
Registered
20 Year Member
 
Joined: Jun 2005
Posts: 8,407
Likes: 797
From: Central IL
Default

My 496 MAG was bored .030 over when I had it rebuilt a couple years ago. Otherwise everything put back bone stock. Dyno'd at 390 HP fully dressed with wet stock exhaust. You shouldn't see any difference.
Knot 4 Me 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.