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It did come drop in ready with its own ECM496 vs 502. Not a huge difference depending on how the motors are built the 502 by nature should have more torque than the 496 when the 502 came out it was 502 cubic inches 502 horsepower I know Marine applications are different. I think something in the tune of the engine cuz I don't think the 496 the computer can run the 502 or did you get a new ECM with it
Well since no one bothered to answer my question.....I did some checking.
Your new 8.2 is rated at 430 Horsepower and 505 lbs of torque at 4,000 rpm. Mercruiser for some odd reason doesn't show torque in their specs anymore.
Your old 8.1 (496 Mag) on dynos ran 400 Horsepower and 526 lbs of torque at 4,000 rpm. https://www.marineindustrieswest.com/installation/496_Dyno.pdf
So....without a lot of commentary....that would explain why you are not seeing much of a difference. I have seen this movie before and logic no longer applies when buying an engine ......dyno results are the only way to actually know what is going to happen when you put it in the boat.
I like Mercruiser products but in this case some of the folks who advised you did not do their homework.
A 30 Horsepower difference won't change anything. Torque on the other hand does. Maybe that is the reason Mercruiser doesn't show it anymore.
As to the previous movie.....we see this everyday with go boats. The engines that show up from Mercruiser are monster 1,000 HP engines but if you don't dyno them you won't know that a properly race built big block engine will drive the boat faster with less horsepower.
His old engine hit 4,600rpm, 40mph WOT with 24p props and 2.0 drive ratio.Well since no one bothered to answer my question.....I did some checking.
Your new 8.2 is rated at 430 Horsepower and 505 lbs of torque at 4,000 rpm. Mercruiser for some odd reason doesn't show torque in their specs anymore.
Your old 8.1 (496 Mag) on dynos ran 400 Horsepower and 526 lbs of torque at 4,000 rpm. https://www.marineindustrieswest.com/installation/496_Dyno.pdf
So....without a lot of commentary....that would explain why you are not seeing much of a difference. I have seen this movie before and logic no longer applies when buying an engine ......dyno results are the only way to actually know what is going to happen when you put it in the boat.
I like Mercruiser products but in this case some of the folks who advised you did not do their homework.
A 30 Horsepower difference won't change anything. Torque on the other hand does. Maybe that is the reason Mercruiser doesn't show it anymore.
As to the previous movie.....we see this everyday with go boats. The engines that show up from Mercruiser are monster 1,000 HP engines but if you don't dyno them you won't know that a properly race built big block engine will drive the boat faster with less horsepower.
His old engine hit 4,600rpm, 40mph WOT with 24p props and 2.0 drive ratio.
His new engine hits 4,000rpm, 32mph WOT with 24p props and 1.81 drive ratio.
I guess it's possible the new engine isn't running right but I question the unnecessary change in drive ratio, less torque at the propshaft at any rpm.
Who chose/recommended the 1.81 ratio outdrive?
Yes, no matter what the size of the props themselves, they don't change the amount of torque at the propshaft that they're mounted on. The new XR drive is a 10% reduction of torque at the propshaft, 1.81 vs 2.0. Add that to the possibility the new engine may be making less torque and it simply can't turn the 24" props.I know the props might mitigate the ratio but it's still not the same ratio it's like changing the size of the back tires on a car You can change the ratio that way but you're still not changing the final drive ratio it's always going to be a 373 or 411 or whatever it is
I don't know squat about drive ratios, but my boat came from the factory with 8.2's married to B3 1.81's
None of those prop sets he's tried are optimum rpm wise, he needs to hit 5200 rpm with a regular load.