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Wales
by Joske Vermeule, September 1
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Forums39
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Jun 14th, 2026
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Joined: Mar 2011
Posts: 217
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Mar 2011
Posts: 217 |
I wonder if anyone here can help,
Last week I made a rash decision and added a 1952 mk 6 Bentley to the Morgan garage, it has had a good life and well looked after up until 10 years ago from which it has travelled approx 500 miles, I have used it for a week but it was running lumpy, today it has been tuned and serviced and runs lovely and smooth but it now breaths very heavy from the engine vent, much more than before, question is can a tune cause extra engine venting ?.. It was running very rich before, now seems to run on correct mixture but runs a few degrees hotter .
Thanks. Alan.
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Joined: Aug 2011
Posts: 898
Talk Morgan Regular
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Talk Morgan Regular
Joined: Aug 2011
Posts: 898 |
Temperature increase would suggest weak mixture.
The increase in breathing suggest someone messing about with oil breather tubes or a breather mesh filter missing.
Lets assume no more piston blowbye that previous to the tune up.
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Joined: May 2014
Posts: 2,780 Likes: 5
Talk Morgan Expert
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Talk Morgan Expert
Joined: May 2014
Posts: 2,780 Likes: 5 |
If it wasn't doing it before the service then I'd go through the basics that may have been altered. Retarded ignition will also give higher temperatures too.. Check vent pipes as anything kinked or blocked will increase crank pressure and blow by ending up as heavy breathing.
Steve
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Joined: Dec 2011
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Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Dec 2011
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I owned a Bentley 'R' Type 1954. Even a Leak Down test did not indicate problems (not so sure mechanic knew how to do a leak down test). In any event when taken apart just about all the piston rings were broken. Bentley/Rolls install a stainles something liner in the top of the cylinders. With mileage the cylinders turn into an hour glass breaking the piston rings. A good Bentley Mechanic can help You. Suggest talking to Norman Gleeson (English) and well known and get some guidance. He helped Me.
Button
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Joined: May 2014
Posts: 2,780 Likes: 5
Talk Morgan Expert
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Talk Morgan Expert
Joined: May 2014
Posts: 2,780 Likes: 5 |
Broken rings would certainly cause heavy breathing but it ought to have been noticeable the week you used it before it was serviced.. But Button is right to suggest talking to someone that knows these engines well, certainly before pulling it all down.
Steve
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Joined: Feb 2010
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Learner Plates Off!
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Learner Plates Off!
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Good for you Alan, a brave decision and a motor car I have always fancied owning but never been rash enough. The later 'big bore' models like yours seem to be the ones to go for - a proper top quality motor car! Hope you get it sorted out and good luck. 
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Joined: May 2012
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Talk Morgan Enthusiast
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Talk Morgan Enthusiast
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What a beautiful car Alan. Perhaps now that its running hotter and leaner it has just had a chance to burn off some carbon.
Roger
2011 Plus 4
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Joined: Dec 2011
Posts: 1,943
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Dec 2011
Posts: 1,943 |
I wonder if anyone here can help,
Last week I made a rash decision and added a 1952 mk 6 Bentley to the Morgan garage, it has had a good life and well looked after up until 10 years ago from which it has travelled approx 500 miles, I have used it for a week but it was running lumpy, today it has been tuned and serviced and runs lovely and smooth but it now breaths very heavy from the engine vent, much more than before, question is can a tune cause extra engine venting ?.. It was running very rich before, now seems to run on correct mixture but runs a few degrees hotter .
Thanks. Alan. norman.geeson@virgin.net English Bentley expert that helped Me. Button
Button
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Joined: Mar 2011
Posts: 217
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Mar 2011
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Thanks for replies, will contact Norman,
Expert said use it for a 1000 miles it may improve as its not been used for so long, but in my experience I have never known improvement , if I need an engine rebuild will need to sell house.
Alan.
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Joined: Dec 2011
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Talk Morgan Enthusiast
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Talk Morgan Enthusiast
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Thanks for replies, will contact Norman,
Expert said use it for a 1000 miles it may improve as its not been used for so long, but in my experience I have never known improvement , if I need an engine rebuild will need to sell house.
Alan.
I spent $10,000. Lower end did not need machining but did need cleaning. 150 fasteners in the crank shaft alone. says Machinist. I did not recoup when I sold the Bentley. We did have several elegant trips to Banff, Alberta, Canada, and Sun Valley, Idaho. 11MPG US gallon. My Wife loved it. I hated it.
Button
Seattle
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