Classic cars forum & vehicle restoration.
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Rollmop
Joined: 23 Dec 2016 Posts: 14 Location: Market Drayton, Shropshire
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Posted: Mon Oct 26, 2020 12:39 pm Post subject: Mayflower compression |
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Has anyone had a compression test done on a Triumph Mayflower engine?
I tested mine to check the cylinder head gasket and get a reading of 73 to 75 psi across the four cylinders. None of the Triumph technical manuals I have seen give a pressure value, is around 75 psi about right for a low mileage engine? Any info/experience would be much appreciated. _________________ Failure is not an option - in my case it is usually a feature.
1971 Herald convertible
1952 Triumph Mayflower |
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Ray White
Joined: 02 Dec 2014 Posts: 6312 Location: Derby
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Posted: Mon Oct 26, 2020 2:37 pm Post subject: Re: Mayflower compression |
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Rollmop wrote: | Has anyone had a compression test done on a Triumph Mayflower engine?
I tested mine to check the cylinder head gasket and get a reading of 73 to 75 psi across the four cylinders. None of the Triumph technical manuals I have seen give a pressure value, is around 75 psi about right for a low mileage engine? Any info/experience would be much appreciated. |
I would think that is a bit low but the main thing is that they are all more or less equal. |
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Sid
Joined: 20 Sep 2017 Posts: 76 Location: From whence cometh the mighty Lagonda
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Posted: Mon Oct 26, 2020 10:04 pm Post subject: |
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To calculate the compression in PSI, and if you know the compression ratio, multiply the first figure by 14.
edit....which is 6.8:1, therefore a compression of 95psi. |
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22446 Location: UK
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Posted: Tue Oct 27, 2020 12:43 pm Post subject: Re: Mayflower compression |
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Ray White wrote: | Rollmop wrote: | Has anyone had a compression test done on a Triumph Mayflower engine?
I tested mine to check the cylinder head gasket and get a reading of 73 to 75 psi across the four cylinders. None of the Triumph technical manuals I have seen give a pressure value, is around 75 psi about right for a low mileage engine? Any info/experience would be much appreciated. |
I would think that is a bit low but the main thing is that they are all more or less equal. |
Agreed, if it runs and drives ok I wouldn't be concerned.
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ukdave2002
Joined: 23 Nov 2007 Posts: 4104 Location: South Cheshire
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Posted: Tue Oct 27, 2020 3:59 pm Post subject: |
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Sid wrote: | To calculate the compression in PSI, and if you know the compression ratio, multiply the first figure by 14.
edit....which is 6.8:1, therefore a compression of 95psi. |
The test need so be completed with the throttle wide open, otherwise it will read low.
Dave |
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Rollmop
Joined: 23 Dec 2016 Posts: 14 Location: Market Drayton, Shropshire
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Posted: Fri Oct 30, 2020 12:43 pm Post subject: |
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Thanks for the CR formula. Once you see it it is a very obvious calculation, atmospheric pressure x compression factor. I will leave it for now but next year may have the head off to check the pistons, bores etc _________________ Failure is not an option - in my case it is usually a feature.
1971 Herald convertible
1952 Triumph Mayflower |
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