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496ho vs 525efi

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Old 08-21-2006, 12:09 PM
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Default Re: 496ho vs 525efi

Warranty has come up several times in this thread. A 5-year Passport Premire policy is available on the 525 through Brunswick Product Protection. Let me know if anybody needs any info.
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Old 08-21-2006, 12:10 PM
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Default Re: 496ho vs 525efi

Wouldnt the CMI's put the 496HO in 500efi territory(which is how much more $$$ than a 496HO from mercury)? What would it take for the additional horsepower needed to get into 525 range.....and keep warranty?
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Old 08-21-2006, 12:19 PM
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Default Re: 496ho vs 525efi

The 525EFI comes out of the factory somewhere between 530HP and 560HP at the crankshaft.

The HP500EFI came out of the factory at 512HP+/- at the crankshaft; 470HP at the prop shaft.

The 496HO would need more than headers to get to 470HP at the crankshaft; and as far as I know, there is nothing else you can do without voiding warranty. Remember your Torque Curve on a 496HO is not going to be the same as a 500EFI once you install headers, even though you may be near the same HP.
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Old 08-21-2006, 01:24 PM
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Default Re: 496ho vs 525efi

I could be wrong, but I'm think'n the black motors are rated at the prop so 496HO's 425 + the documented header gains and you'd be close to the HP500's 470, not sure on the torque but the real speed numbers gained suggest that improved too.

Merc gets a lot of premium for the blue paint, more than the value they deliver. I know the blower I had on my 575SCI was a POS design with puny sealed brgs that went south at 140 hrs- granted the Lysholms they use now are a nice piece.
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Old 08-21-2006, 01:45 PM
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Default Re: 496ho vs 525efi

well maintained 496ho's,500's, and 525's should go at least 500hr's before overhaul.....
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Old 08-21-2006, 06:39 PM
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Default Re: 496ho vs 525efi

An uncorked (unmuffled) 525 can scare/startle unsuspecting people standing near it when started That right there is worth the price of admission!
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Old 08-21-2006, 07:13 PM
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Default Re: 496ho vs 525efi

Quote:
Originally Posted by Sydwayz
The 525EFI comes out of the factory somewhere between 530HP and 560HP at the crankshaft.

The HP500EFI came out of the factory at 512HP+/- at the crankshaft; 470HP at the prop shaft.

The 496HO would need more than headers to get to 470HP at the crankshaft; and as far as I know, there is nothing else you can do without voiding warranty. Remember your Torque Curve on a 496HO is not going to be the same as a 500EFI once you install headers, even though you may be near the same HP.

I know of one CMI 496 HO installation that did not gain anything on top end!
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Old 08-21-2006, 07:34 PM
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Default Re: 496ho vs 525efi

Quote:
Originally Posted by Magic Medicine
I know of one CMI 496 HO installation that did not gain anything on top end!
Yeah, I know that guy too, but he smokes a lot of crack!

Like I said, I think the header is good for the motor, and should increase your HP which will help with SOME setups, but I don't know what it does to the torque curve. The midrange and cruise may improve, but top end may not; or vice versa.



I am fairly confident I will get my boat to 80mph with stock 496HOs one day. It won't be a consistant thing, but I have seen a best of 77.5mph with a heavy load in no current fresh water body of water.

With labbed props, some exhaust tuning, salt water, cooler/low humidity air and a light load, I know she has 80 in her. I still have at least 250 RPMs that I have never seen with the stock 28s.
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Old 08-21-2006, 07:49 PM
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Default Re: 496ho vs 525efi

Brian when you going todo the deal on the offical start and trade the 37 and get some blue motors OR Ilmores and then I can get the 37 from Pat

Last edited by cosmic12; 08-21-2006 at 08:23 PM.
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Old 08-21-2006, 08:27 PM
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Default Re: 496ho vs 525efi

You know, about 5 people are on the "list" if Monsoon goes up for sale. Clark calls me about once every two weeks! I can't imaging not owning my boat.
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