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Is my 500 efi done for the year? Got hot and now hard to start.

Old 08-27-2016, 09:55 PM
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Since i started flowing and testing injectors as part of my business this year i have seen and heard of at least 5 guys burning up pistons from leaning stuff out from low flowing injectors, every set i tested so far from these instances had 1 or 2 that flowed 20+% LOW, more common than you would think. Makes sense though, hp 500efis and 502 mpis are getting to be 15/16 years old, guys are running injectors that have NEVER been checked for 15+ years, its especially prevelant in stuff guys buy that hasn't ran in a couple years, a couple cans of seafoam is wishful thinking!
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Old 08-27-2016, 10:05 PM
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So it's specific to 502 s. Do the after market blocks have the same issues ?
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Old 08-27-2016, 10:05 PM
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If one quit completely it would be a different story, boat would have dead cylinder vs a critically lean cylinder still firing which destroys piston,bore and sometimes the block!
Attached Thumbnails Is my 500 efi done for the year? Got hot and now hard to start.-20160327_145549.jpg  
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Old 08-27-2016, 10:06 PM
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Originally Posted by articfriends
Since i started flowing and testing injectors as part of my business this year i have seen and heard of at least 5 guys burning up pistons from leaning stuff out from low flowing injectors, every set i tested so far from these instances had 1 or 2 that flowed 20+% LOW, more common than you would think. Makes sense though, hp 500efis and 502 mpis are getting to be 15/16 years old, guys are running injectors that have NEVER been checked for 15+ years, its especially prevelant in stuff guys buy that hasn't ran in a couple years, a couple cans of seafoam is wishful thinking!
Good info. Ty
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Old 08-28-2016, 04:40 AM
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Originally Posted by tommymonza
So it's specific to 502 s. Do the after market blocks have the same issues ?
Not as common to burn an aftermarket block because of leaning out but they will burn through as well. A block will burn through b4 a cometic gasket. I have never seen a cometic burn through.
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Old 08-28-2016, 04:42 AM
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Originally Posted by articfriends
Since i started flowing and testing injectors as part of my business this year i have seen and heard of at least 5 guys burning up pistons from leaning stuff out from low flowing injectors, every set i tested so far from these instances had 1 or 2 that flowed 20+% LOW, more common than you would think. Makes sense though, hp 500efis and 502 mpis are getting to be 15/16 years old, guys are running injectors that have NEVER been checked for 15+ years, its especially prevelant in stuff guys buy that hasn't ran in a couple years, a couple cans of seafoam is wishful thinking!
These marvelous fuel injected motors have kept me buisy all season...
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Old 08-28-2016, 10:04 AM
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Originally Posted by Black Baja
I can get u a Dart Block for around $1800 and you don't have to drive to Ohio. They come out of Philly. Pm me if you need a hand.
I will keep that in mind. Thanks
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Old 09-11-2016, 03:20 PM
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[ATTACH=CONFIG]559298[/ATTACH][ATTACH=CONFIG]559299[/ATTACH][ATTACH=CONFIG]559300[/ATTACH][ATTACH=CONFIG]559301[/ATTACH]

Both engines are fully rebuilt. I still need to get all the attachments installed back on them and get the headers pressure tested. But what a relieve to get this far.
Attached Thumbnails Is my 500 efi done for the year? Got hot and now hard to start.-20160907_141431.jpg   Is my 500 efi done for the year? Got hot and now hard to start.-20160907_134626.jpg   Is my 500 efi done for the year? Got hot and now hard to start.-20160907_134752.jpg  

Is my 500 efi done for the year? Got hot and now hard to start.-20160907_134740.jpg  
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Old 09-13-2016, 08:27 PM
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[ATTACH=CONFIG]559398[/ATTACH][ATTACH=CONFIG]559400[/ATTACH]
Well I'm getting there. Maybe they will be ready to put back in the boat tomorrow.
Attached Thumbnails Is my 500 efi done for the year? Got hot and now hard to start.-20160913_092804.jpg   Is my 500 efi done for the year? Got hot and now hard to start.-20160913_184739.jpg  
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Old 09-13-2016, 08:34 PM
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wow! moving along fast!
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