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What have you done today with your Austin Seven
Further investigation of the Pytchley engine showed that the centre stud is sound but I do remember having trouble with it in the distant past.   My problem seems to be that I had fitted a low comp head which had been milled at an angle.  This was not sitting comfortably on the block.
To cut a long story short, I decided to change the cylinder head.  Looking in the spares department, my options were as follows:
Standard low comp head - several but all needing fettling before use
Standard late Ruby  head - tried this before, engine suffered plug oiling.
Dante aluminium head - new unused - virtually no combustion chamber!
Aluminium Ricardo head - very tempted but it didn't want to slide easily over the head studs (The head is right, my head studs obviously are not!)
Bronze Ulster head - previously fitted on the RL - not too high a comp ratio, bearing in mind that the engine has a standard crank.

I opted for the bronze Ulster head, tightened it down and fired the engine up.  Whereas before the engine sounded quite sedate it is now a snarling monster, despite having a civilised exhaust system with an Austin Metro silencer.
I need to do some work on the radiator drain tap before using the car.   I am a bit worried that the exhaust note might attract undue attention!
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Messages In This Thread
Peak District well dressing - by Tony Griffiths - 31-08-2019, 05:00 PM
RE: What have you done today with your Austin Seven - by Malcolm Parker - 07-08-2020, 02:32 PM
Genuine old and imitation new - by Tony Griffiths - 01-07-2021, 03:37 PM
Crankcase machining - by Chris Garner - 29-08-2023, 08:59 PM
Massed ballon landing and A7 - by Tony Griffiths - 03-09-2023, 08:27 PM
Popping and not pulling well? - by Biddlecombe - 10-04-2019, 03:37 PM

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