Offshoreonly.com
Page 2 of 2
1
2
Show 40 post(s) from this thread on one page

Offshoreonly.com (https://www.offshoreonly.com/forums/)
-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Twin engine question (https://www.offshoreonly.com/forums/general-q/358840-twin-engine-question.html)

getrdunn 02-01-2019 07:18 PM
Just an FYI. His boat won't go in circles if your wondering. lol

boatnt 02-02-2019 07:42 AM
Originally Posted by getrdunn (Post 4670798)
Just an FYI. His boat won't go in circles if your wondering. lol
lol

getrdunn 02-02-2019 10:24 AM
Originally Posted by boatnt (Post 4670837)
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?

ezstriper 02-03-2019 07:54 AM
Originally Posted by f_inscreenname (Post 4670741)
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.

f_inscreenname 02-03-2019 11:48 AM
Originally Posted by ezstriper (Post 4670942)
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.

Full Force 02-05-2019 05:15 AM
Sleeve it, then they will be the same.... cheap to do..

Full Force 02-05-2019 05:17 AM
Originally Posted by getrdunn (Post 4670857)


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.

boatnt 02-05-2019 08:50 AM
Originally Posted by Full Force (Post 4671225)
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

Knot 4 Me 02-05-2019 09:16 AM
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.


All times are GMT -5. The time now is 04:07 PM.
Page 2 of 2
1
2
Show 40 post(s) from this thread on one page


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