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06-03-2020, 03:18 PM | #1 |
Scooby Guru
Member#: 82745
Join Date: Mar 2005
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SCIC
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Vehicle:2005 Subaru STI 2003 EJ207 S204 Wagon |
Flex hone and new rings on old block?
What are people's thoughts of using a flex hone and new rings to clean up cylinders that do not need to be bored? How well will it seal?
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06-03-2020, 03:26 PM | #2 |
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Fine assuming PTW is still within spec and you gap the rings right. Seal would be just like a fresh bore/hone assuming things are still round and other stuff is in spec.
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06-03-2020, 04:38 PM | #3 | |
Scooby Specialist
Member#: 13530
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I'll just leave this discussion here: https://www.ultimatesubaru.org/forum...cylinder-hone/
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06-03-2020, 07:07 PM | #4 | |
Scooby Guru
Member#: 82745
Join Date: Mar 2005
Chapter/Region:
SCIC
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Vehicle:2005 Subaru STI 2003 EJ207 S204 Wagon |
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06-04-2020, 12:04 PM | #5 |
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
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SCIC
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Vehicle:2004 WRX wagon silver |
is your engine alredy giving out on you? its a cheap way to get around honing your block. its like brakes why resurface your rotors. so your pads can embed into to rotors. same concept with the cross hatches. bt yeah I guess it would work. Ive seen one of the shops I frequent use them/ but it was a cheap fix cause the customer didnt have the money to do it the right way. Personally I would rather get a new block cause there is a good chance your cylinders are out of round.
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06-04-2020, 12:58 PM | #6 | |
Scooby Guru
Member#: 82745
Join Date: Mar 2005
Chapter/Region:
SCIC
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Vehicle:2005 Subaru STI 2003 EJ207 S204 Wagon |
Quote:
I'll give Total Seal a call and see what they say about the ideal cylinder finish for their rings. |
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06-04-2020, 02:32 PM | #7 |
Scooby Guru
Member#: 82745
Join Date: Mar 2005
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Vehicle:2005 Subaru STI 2003 EJ207 S204 Wagon |
I called Total Seal and they were very helpful. They said that a 280 flex hone can work to produce the correct finish on low mileage engines, but for motors that are 50K+ miles, honing with stone is ideal. Also, the life of the gapless ring should be similar to factory and only used for the top ring and not the second for our application.
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06-04-2020, 05:16 PM | #8 | |
Scooby Specialist
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Quote:
If in doubt, ask a Subie engine builder or machinist, of which I am neither. More discussion: https://www.ultimatesubaru.org/forum...omment=1406764 |
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06-05-2020, 02:39 AM | #9 | |
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06-05-2020, 03:00 AM | #10 | |
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06-05-2020, 03:36 AM | #11 |
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I flex hone the motors I freshen up (subarus and others) when putting in new rings, if they don't need a full rebuild. If the walls are totally flat it will increase drag. The tiny hone markings on the wall retain oil and the rings just touch the raised portions, with a thin layer of oil in the valleys reducing friction.
Last one I did was my own 99 forester about 6 months ago. Runs perfect and has not used any oil between oil changes (2000 miles & 5000 miles so far). |
06-05-2020, 10:29 AM | #12 |
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+1 if theres no lip that can be felt by the fingernail then a light stone bore hone using a light oil or brake cleaner being sprayed while doing it should be perfect with new rings. i have done this in both professional settings and personal builds with great success, if its able to be felt should be bored and measured to ensure ptw isnt excessive. i know a few people that dont bother to re-ring it and they do ok from what they tell me...
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06-05-2020, 03:50 PM | #13 | |
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Quote:
That excerpt was published in an engine building manual, Chevrolet Power (5th Edition), the cover is inset in the photo. If you read the entire paragraph, they do indeed discuss the particular finish you describe above, suggesting to use a 400-500 grit stone, "establishing a good cross hatch pattern in the bore." They follow that bore finishing advice by saying that unless it's absolutely necessary, don't do it (the red underlined passage). Honing a bore with a dingle-ball hone or even the spring-loaded square stones is incredibly imprecise and should be done with appropriate equipment. If you don't care about the engine and just want to experiment, then by all means, go for it, enjoy yourself and prosper! Any engine I put in any of my vehicles would go to an engine machinist, since they have the equipment, training, and experience to do it properly. For my money, there just isn't a good reason to use post-apocalyptic engine machining methods if you don't absolutely need to. |
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