Hirtenberger .61 (4 bolts head)

HP engines (Hirtenberger, AG Austria) tech support. Owned by RJL Industries since 1990

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Hirtenberger .61 (4 bolts head)

Postby leoplanes » Thu May 07, 2009 6:58 pm

I have an austrian hirtenberger four bolts head , front induction. I bought the engine from ebay , my question is it has a single ring , but i feel it has not good compression . This ring is a little differente , it is not a dikes ring , it is a single ring with a groove around its surface . It looks like lubrification groove . I ckecked it , its is ok , but I feell it is has only a small spring action against cilinder walls . Is it normal ? Somehow when it will be running some adittional pressure will be formed , like a dykes rings?

Thanks for fellows help . Antonio
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Postby MECOA » Thu May 07, 2009 8:54 pm

Try running it and see if the compression comes up.
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