Jag! The Ghostly fleet thread
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- Tenth Dan Tetris Gnu
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Re: Reliable Mazda Engine: a spectral fleet thread
Valve stem seals Im sure will not have a bearing on compression. It's quoted 10% isn't it an ideal to be between acrossthe pots? That's how I've always gone by too. 150 is over the 10% from 175. Try some oil treatment maybe? It did help the reliant last year.
- Junkman
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Re: Reliable Mazda Engine: a spectral fleet thread
Well, that snake oil sure didn't help the Reliant this year now, did it?
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1957 DKW 3=6 Sonderklasse
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- It's S small i C
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Re: Reliable Mazda Engine: a spectral fleet thread
As they made so many of these things and so many rotted, if you ever need to do an engine replacement then it won't cost a lot. Plenty of info on how to do it too.
- Uncle Albert
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- Tenth Dan Tetris Gnu
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Re: Reliable Mazda Engine: a spectral fleet thread
No but it assisted it last year. Only used it twice Wynn's oil treatment. I found 20/50 oil was actually better to run the reliant on though
- Hooli
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Re: Reliable Mazda Engine: a spectral fleet thread
Valve stem seals have nothing to do with compression. Valve seats do however.
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- John F
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Re: Reliable Mazda Engine: a spectral fleet thread
Yep. Valve heads / seats are likely to be the main culprits. Possibly also piston rings, but they usually just give you reduced power at high revs rather than a noticeable drop in compression.
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1998 Disco 4.0 V8 (manual)
1994 Vauxhall Calibra 3.0 V6
Running but need fettling:
1986 Honda CBX750F
1991 Maserati 222 SE
1990 Yamaha XJ900F
Tax & MOT-exempt, woohoo!
1982 Suzuki GSX1100SZ Katana
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Re: Reliable Mazda Engine: a spectral fleet thread
Don't worry till it's down to less than 100 psi or only running on 3 cylinders.
If isn't broken don't fix it!
If isn't broken don't fix it!
- Hooli
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Re: Reliable Mazda Engine: a spectral fleet thread
Ghosty, did you repeat the compression test with a bit of oil down each bore?
If oil improves the readings then the rings are the issue, if not then it has to be valves (or a massive score in the bore but that'd smoke like a tank).
If oil improves the readings then the rings are the issue, if not then it has to be valves (or a massive score in the bore but that'd smoke like a tank).
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