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-   General Boating Discussion (https://www.offshoreonly.com/forums/general-boating-discussion-51/)
-   -   De-Tuning 850's??? (https://www.offshoreonly.com/forums/general-boating-discussion/286214-de-tuning-850s.html)

Young Performance 10-12-2012 12:35 PM
Originally Posted by sutphen 30 (Post 3794658)
going to the bone yard to find some canidates on saturday.i needed a winter project besides the 1300hp 581ci whipple motors.:evilb:
Don't take on too much. You're no spring chicken anymore.......old man:lolhit:
Give me a shout if you want to bs.
Eddie

sutphen 30 10-12-2012 04:24 PM
Originally Posted by Young Performance (Post 3794807)
Don't take on too much. You're no spring chicken anymore.......old man:lolhit:
Give me a shout if you want to bs.
Eddie
:lolhit:

Sounds good,I will.

BONDO10 10-16-2012 07:33 AM
Couple more question. Other than the obvious HP,what is the differences between 850's and 1075's? Both solid lifter,twin screw.Are the super chargers larger?Are they the same cubic inch? Maintainance wise,is there any difference between the two.
Searched Merc's site,but not much info on the 1075 now that it's discontinued. Thanks for all the info all ready,got some informative P M's as well. Jeff

ciaoderhead 10-16-2012 09:53 AM
Originally Posted by BONDO10 (Post 3796678)
Couple more question. Other than the obvious HP,what is the differences between 850's and 1075's? Both solid lifter,twin screw.Are the super chargers larger?Are they the same cubic inch? Maintainance wise,is there any difference between the two.
Searched Merc's site,but not much info on the 1075 now that it's discontinued. Thanks for all the info all ready,got some informative P M's as well. Jeff
I had my 850's rebuilt to 1075's. Cam change, new (smaller) blower pulleys and reprogram ECM.

Young Performance 10-16-2012 09:56 AM
The only differences in the 2 are the camshaft (1075 is larger), blower pulleys (1075's are smaller for more boost), and the program in the ecm. The 850 has a little longer top end interval.
Eddie

44MTI 10-16-2012 10:09 AM
Originally Posted by BONDO10 (Post 3796678)
Couple more question. Other than the obvious HP,what is the differences between 850's and 1075's? Both solid lifter,twin screw.Are the super chargers larger?Are they the same cubic inch? Maintainance wise,is there any difference between the two.
Searched Merc's site,but not much info on the 1075 now that it's discontinued. Thanks for all the info all ready,got some informative P M's as well. Jeff
1075's are good for about 110-125hrs before the lifters let go.
You might want to talk to Mark at Precesion Marine. I think he has some solid lifters that they are gettin 200+ hrs out of. This would make the 1075's even more attractive.


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