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Old 05-28-2006 | 03:39 PM
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From: Bergen, NORWAY
Default RE: OS Max 10 FP raise up from grave with a new soul as dieselengine.

ORIGINAL: Franck

Hello Jens,

I have one 10FP on my bench for conversion. Thought about getting a davis head (im kinda lazy i guess) , but why not make one myself after all.
Question, what did you use as seal for the contrapiston ? A hi temp o ring ?

BEst regards,

Franck
The contrapiston lapped and mounted thight in the sleeve, but can be moved of compression and without leakage.

Also nothing contrapiston in the cylinderhead, the cylinderhead are to hold the sleeve at place in crankcase.


How i did with new sleeve and piston:
The sleeve was lapped first before the piston lapped a bit tight until exhaustport in the sleeve + lapped through sleeve with chrome polish pasta. The sleeve must be tapered to keep compression while piston are raising to top of dead centre.

How to control after lapping are finished:
Without oil the piston moves tight in sleeve and with oil will piston move light in sleeve + loose in bottom of sleeve and tight in top of sleeve.

Jens Eirik

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