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Author Topic:   Boosting Horsepower of 225 3-liter Merc engine
JimU posted 11-04-2002 10:51 AM ET (US)   Profile for JimU   Send Email to JimU  
Does any one have experience with modifying a 3 liter V-6 Merc/Mariner Engine to get more power? What are the modifications and what is the approximate cost? Do they affect engine life. Thanks. JIM
Clark Roberts posted 11-04-2002 05:14 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Check out the Merc Performance Division products... they make lots of speed/power booster products for the 2.4 and 2.5 liter blocks and most likely also for the 3 liter! The 2.4 can be boosted to around 300hp but this is for racing at 7-8 thousand rpm.. Anytime you boost hp you give up something, low end torque, smooth idle etc.... right off the bat you could move reed stops back a bit (get some Merc bass pro shop advice), install fiberglas reeds, swing timing up a bit and rejet carbs (unless EFI). If EFI you may find a performance chip for the ECM or even a performance ECM replacement! Not a good idea to increase compression ratio!!! Just some ramblin' thoughts. Clark
captbone posted 11-04-2002 05:45 PM ET (US)     Profile for captbone  Send Email to captbone     
I still think its not worth it, but check out SVS system,
Swellmonster posted 11-06-2002 11:22 AM ET (US)     Profile for Swellmonster  Send Email to Swellmonster     
I have the 3 ltr EFI. Let me know what you find. I'm interested in reed plates, maybe a chip.
What do you have the motor on?
How fast are you now?

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