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HP 500's-Most hours?

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Old 11-18-2006, 09:23 PM
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Default HP 500's-Most hours?

Who has the most hours on HP 500 EFI's? Im @ 430 and they run great, but I hearing refresh soon. Wondering who has run them up and who has refreshed-chose to or had to?

Thanks in advance.


PS- If refreshing, Im thinking of whipples and drive beef up- might as well get some more power while they're out-any feedback on that setup would be cool.
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Old 11-18-2006, 10:11 PM
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Default Re: HP 500's-Most hours?

The Whipple is the best blower out there and you will be very pleased!!
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Old 11-19-2006, 08:06 AM
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Default Re: HP 500's-Most hours?

my 500efi is out for rebuild ( bore/stroke) after 447 hrs by choice. I figure at least 1/2 of those hours are at 5000 rpm or better. Solid piece of performance engineering. Now, if only drives would last that way
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Old 11-19-2006, 10:19 AM
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Default Re: HP 500's-Most hours?

I am around 450 hours changed my valve springs around 350, Did a leak down and mech said the pressure was still like new, in great shape. SO I am going to keep her stock and keep going.

WILL
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Old 11-19-2006, 11:53 AM
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Default Re: HP 500's-Most hours?

Quote:
Originally Posted by BURGER&FRIES
Are they fresh water cooled like the 525's??
No, I don't think so. I'm told that the only difference between the 500's and the 525's are the aluminum heads built for Merc by Edelbrock and the closed loop cooling.
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Old 11-19-2006, 12:16 PM
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Default Re: HP 500's-Most hours?

500 efi is the "Official Engine" of ORL. Affordable , dependable and there are many out there. If you guy's know where some are for sale let me know! Thanks.

www.offshoreracingleague.com
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Old 11-21-2006, 12:28 AM
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Smile Re: HP 500's-Most hours?

Quote:
Originally Posted by 27Fountain
I am around 450 hours changed my valve springs around 350, Did a leak down and mech said the pressure was still like new, in great shape. SO I am going to keep her stock and keep going.

WILL

Just springs and no valve job? I was told Valve job needed motors pulled and might as well rebuild?

I think I'll run leak down first and then see if I can milk em for another 400

Anyone else got high hours w/ no work done?
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Old 11-21-2006, 12:30 AM
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Default Re: HP 500's-Most hours?

Quote:
Originally Posted by UNSANE
No, I don't think so. I'm told that the only difference between the 500's and the 525's are the aluminum heads built for Merc by Edelbrock and the closed loop cooling.

Not closed cooled and yes have been salty 1/2 dozen times-
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Old 11-21-2006, 12:32 AM
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Default Re: HP 500's-Most hours?

Quote:
Originally Posted by Airpacker
my 500efi is out for rebuild ( bore/stroke) after 447 hrs by choice. I figure at least 1/2 of those hours are at 5000 rpm or better. Solid piece of performance engineering. Now, if only drives would last that way
75% of my hours have been under 4500 rpm, do you mind sharing the total cost for your rebuild, roughly?

Lucky for me drives have been solid for XZ's. One minor repair.
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Old 11-21-2006, 12:37 AM
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Default Re: HP 500's-Most hours?

Quote:
Originally Posted by motobri
Who has the most hours on HP 500 EFI's? Im @ 430 and they run great, but I hearing refresh soon. Wondering who has run them up and who has refreshed-chose to or had to?

Thanks in advance.


PS- If refreshing, Im thinking of whipples and drive beef up- might as well get some more power while they're out-any feedback on that setup would be cool.
what make and model boat are they in ? weight ?
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