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MG MGF Technical - Ubercompression..beware?

I recently replaced pistons on an 18V engine. Being cheap, I opted for the best deal which happened to be 8.8:1's from the lovely folks at BPNorthwest.

My compression readings now are -evenly- at 180psi. Since that's about 15% over 160 I'm feeling a bit queasy.

I've read that some people have been doing this on purpose with no major issues when using 92octane pump gas.

I'm fine with that, but worried how this will affect my engine. Should I consider trading in my head for a pre 18V version or just lean back and enjoy the power?

Also, should I get new needles with my HS-4's and modify timing differently than before? I'm seeming to have problems getting the engine to run rich enough (may be unrelated to pistons/CR)

thoughts?
philip
Philip

Philip,

Since you're talking about 18V engines I'm guessing this should have been posted in the MGB Technical board rather than the MGF board! :)

Cheers,
Tim.
Tim Jenner

Not many MGFs in NY either Tim...
Rob Bell

Good point well made, Rob, didn't clock that! :) I think that indicates a frightening level of geekness on my part...
Tim Jenner

Would a couple of HS4s give more efficient atomisation than the F's standard injection system?

Chris
Christopher Marshall

Not if they're anything like the 38 year old HS4s I have on my B!
Tim Jenner

LOL! :o)
Rob Bell

oops. sorry about that :)
wrong post indeed.
p
philip

This thread was discussed between 30/09/2004 and 01/10/2004

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