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Cylinder Wall Pics....the Dreaded Bore Wash?


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#46 ACDodd

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Posted 17 February 2013 - 11:13 PM

Come on, be real, no one should have there foot on the floor on a new engine!

I like them running with a hint of lean misfire at part throttle during run in.

AC

#47 mk3 Cooper S

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Posted 17 February 2013 - 11:24 PM

A hint of lean is not stupid lean in my book.That was the description in the post.

What part load AFR do you run them in at ?

#48 ACDodd

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Posted 17 February 2013 - 11:28 PM

0.5 Co% from 1500rpm.

Ac


#49 mk3 Cooper S

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Posted 17 February 2013 - 11:34 PM

About 14,2;1 - lean agreed

#50 Pigeonto

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Posted 18 February 2013 - 08:46 AM

Aha,I hadn't noticed this is back again.I think it's a good thing to do if it may save anyone from the dissapoinment of building a new engine precisely,only to spoil it at the very end.Mine's coming out to sort out these sizes but I'm experimenting with it as is,trying to get a useable carb setting / needle choice ready for initial start up after it's rebuilt so there's no danger of being too rich,but driveable without destroying the engine steadies from being so weak it jumps about.

#51 wrayminis

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Posted 05 July 2015 - 12:11 AM

Oh No I fear I have the same Engine from the same place with the same problem..!!!..as soon as you said SIMON..!!!we have the exact same problem with the exact same engine....we have changed the block..that only leaves the pistons or rings??and after just 2K miles the cam followers and some lobes of the cam were worn out!!






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