Ivan Lawton wrote:
>
> I have a 79 B that has a very low time 18V engine that has a miss
> starting at 2200 RPM to 4200 RPM. The engine will not rev over 4200
> under load. No load, no miss and redline is easily attainable.
> Anyway, after changing the entire electrical system, intake/exhaust
> manifold, carburetor and fuel delivery system with no change I
> decided that the engine might be miss timed so I tried a test from the
> MGB Register page. The test indicated that when the #2 valve just
> started to open the timing mark was at 5 degrees before TDC and not at
> TDC. Well I thought that was it so I disassembled the front of the
> engine and checked the customary marks ect. With everything dead nuts
> “on”, that is all keyways and sprocket marks are dead “on” this engine
> shows TDC to be 5 degrees before TDC!
>
> My question is how can this happen and can a rebuilt engine with
> probably both the head and block planed and an older profile cam
> exhibit this anomaly or is the engine really miss timed?
>
> Thanks for your help,
>
> IKE Lawton Annapolis, MD.
Just a note that MINISPORT, a firm in the UK who sell bits to make your
Mini go like a rocket, also sell OFF-SET keys for the crankshaft and the
camshaft, so you can get the timing correct. It seems quite a few were
like yours, well out!! It is called 'Production tolerances'.
Neil
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