Rebuild time on HP500's?
#2
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Re: Rebuild time on HP500's?
Originally Posted by miamioffshore
After how many hours is it recommended that you rebuild HP500's?
Thanks,
M
Thanks,
M
Last edited by JCPERF; 01-24-2006 at 07:58 PM.
#3
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Re: Rebuild time on HP500's?
I still think 300 is the magic number, new rings, springs, gaskets, bearings & lifters. The 500 Carb's seem to be able to make it to 500 hours but I dont like to push things. It dont have as agressive as a cam as a 500EFI
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Re: Rebuild time on HP500's?
It is very common on HP 500's to have broken valve springs at 200-250 hrs.
Mike
Roccard Marine Engines
www.roccardmarineengines.com
[email protected]
570-956-2840
Mike
Roccard Marine Engines
www.roccardmarineengines.com
[email protected]
570-956-2840
#6
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Re: Rebuild time on HP500's?
I would agree 300-350 is a good number of hours for freshen. Of course everything has to do with like JC said how hard your are on them. And how good is your maintenance program.
Dean Gellner
Dean Gellner
#7
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Re: Rebuild time on HP500's?
Do a leak down test to check the health of the engine. A general rule for average use would be top end refresh at 200-250hrs and full rebuild at 400-500hrs.
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Re: Rebuild time on HP500's?
I replaced my valve springs at around 370 hours already had a inner spring broken, no damage though. I am around 450hours now and don't plan on replacing my lifters until 550-600 hours. Very little time running WOT. I was told by multiple builders that these motors babied could get 1000 hours before a full rebuild?? Oh well I had the leak down test done at 370hours and the mech said it was still with in tolerences of a new motor? what ever that meant
WILL
WILL
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Re: Rebuild time on HP500's?
Mine made it to 400 hours, with new springs @ 200.
Then, lost a valve seat in one cylinder. But that was the result of leaking headers. Unfortunately, both motors had leaking headers, so both needed complete rebuilds.
If it weren't for the headers, I think the motors had many more hours in them.
Then, lost a valve seat in one cylinder. But that was the result of leaking headers. Unfortunately, both motors had leaking headers, so both needed complete rebuilds.
If it weren't for the headers, I think the motors had many more hours in them.