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De-Tuning 850's???

Old 10-12-2012, 01:35 PM
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Originally Posted by sutphen 30
going to the bone yard to find some canidates on saturday.i needed a winter project besides the 1300hp 581ci whipple motors.
Don't take on too much. You're no spring chicken anymore.......old man
Give me a shout if you want to bs.
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Old 10-12-2012, 05:24 PM
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Originally Posted by Young Performance
Don't take on too much. You're no spring chicken anymore.......old man
Give me a shout if you want to bs.
Eddie


Sounds good,I will.
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Old 10-16-2012, 08:33 AM
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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
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Old 10-16-2012, 10:53 AM
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Originally Posted by BONDO10
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.
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Old 10-16-2012, 10:56 AM
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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
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Old 10-16-2012, 11:09 AM
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Originally Posted by BONDO10
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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