Engine Builders - Hone the Block after 6 hours

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Aug 20, 2005 | 06:40 PM

racecar

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From: Portland Oregon

Engine Builders - Hone the Block after 6 hours

Do I need to hone the cylinders or put new rings in after 6 hours? I am pulling out my motor to tighten up the main bearings. I have about 5 or 6 hours on it since it was built. Most of that has been runs through the country with the scanner on, and one race weekend at the track. I was planning to just re-use the pistons and rings as is, but I just pulled off the throttal body and noticed a lot of oil in the intake from the PCV system. Is that normal, do I have excess blow by? I have not noticed any smoke or oil consumption. Maybe I will do a leak down test. If it is good, can I re-use the rings without a hone job?

Aug 20, 2005 | 11:15 PM

GMPerf

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From: Toronto-Canada

The only way you can re-use the rings is if you don't hone it

Just keep them in the same holes...

Aug 21, 2005 | 12:59 AM

racecar

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From: Portland Oregon

No sweat, pull the piston and put it back. I'm going to check the leak down on Sunday AM. I will post what I find.

Aug 21, 2005 | 11:20 PM

racecar

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From: Portland Oregon

4% - 6% leak down. 4 on some as much as 6 on others. Wow, that does not really sound good, my LS1 that I am selling with 18K had 2%. I'm calling my motor builder tomorrow to see if we need new rings. Maybe these didn't seat properly, what's up with that? Will they get better with time???

Aug 21, 2005 | 11:26 PM

magius231

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well depending on your school of thought, 5 hours really isn't a lot of time to give new rings to seat properly. give it a few hundred miles then check it

Aug 22, 2005 | 03:38 AM

J-Rod

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From: Texas

A motor needs some time to seal up....

Aug 22, 2005 | 10:01 AM

GMPerf

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From: Toronto-Canada

Racecar, your leakdown is fine, I'd re-use them if it we're me.

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Aug 22, 2005 | 02:00 PM

racecar

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From: Portland Oregon

My motor guy said to try to determine if the leak is coming from the cylinder, or the valves. I'm going to pressure it again when I get the intake off and listen to the intake and exhaust ports. If the valve grind is leaking, I will re-grind the valves. Sounds like you guys are OK with the rings. This test was with a cold motor, the ring gap would probably decrease and seal up better if it was warmed up.