wfb
Part of things
Posts: 191
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I picked up a BMC B series engine last week. I have no idea of it's history so I have taken the head off to get a look at the bores. The bores looked good with no obvious sign of ware. I have put about an inch of diesel into each cylinder to see how well the rings are sealing but what I need to know is how long it should it take to drain away if the rings are good or bad? It has been in there for four days so far and two cylinder still have about 3/4 of an inch in there and the other two are just under 1/2 an inch.
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aaronb
Part of things
Fezza nearly done
Posts: 85 
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Mar 14, 2018 20:21:52 GMT
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Sounds good to me mate. I have used petrol in the past and put about 20mm in and usually if they are bad enough to worry. It's all gone within the hour. Last resort is compression tester when it's all back together.
Hope that helps.
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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Piston ring questionslater
@slater
Club Retro Rides Member 78
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Mar 14, 2018 23:36:17 GMT
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If you really want to know you have to use a leakdown tester rather than compression test but if you're just after a quick 'are they any good' then i think you have your answer.
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wfb
Part of things
Posts: 191
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Mar 15, 2018 17:57:20 GMT
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Thanks for the replies. I have found a good video on youtube of a guy at an MG specialist in America testing the rings on an MGB and according to the video bad rings allow the fluid to start draining away within 15 minutes so I think mine will be good enough as they are are still holding after five days.
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