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September 29th, 2008
Q & A: Compression on 1971 MGB
Wednesday January 04th, 2006
John,
I just took compression readings on my 1971 MGB 1800V engine.
My readings show 110 PSI across all piston cylinders (engine warm). Absolutely no variance between cylinders.
My question:
I believe that 130 PSI is the proper compression pressure for my engine. Is 110 PSI acceptable compression or would you suggest replacing the piston rings.
Is it a requirement to take the engine out to replace the piston rings?
I am also planning on replacing the current head with a new one. Will a new cylinder head improve the compression pressure also?
Sincerely
Doug
Doug!
You have no need to fret! The imperative here is that the cylinders have consistent compression. That they do, so you're in great shape. The maximum variation suggested by most good engine tuners is 10%.
No... read more
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Tip of the Day
It makes no difference how quickly your MG will accelerate if it cannot
stop! The proper functioning of your brakes must ALWAYS be at the
top of your list of priorities. You owe this degree of safety to yourself,
your passenger, and all others on the road.
John H. Twist (Fall, 1980)