Author Topic: Cast iron piston for EW 350  (Read 5715 times)

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Offline Edin

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Cast iron piston for EW 350
« on: 07 Feb 2009 at 15:33 »
Hej all.
I need help,- to tell me about clearance between EW 350 cast iron piston,- and cylinder wall,- on my EW 350
The pistondiameter is about 62,4mm
Can some out there please tell me, what clearance I must (have to) use on cast iron piston in this size.
Regards Edin DK

Offline roy

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Re: Cast iron piston for EW 350
« Reply #1 on: 07 Feb 2009 at 17:34 »
Edin,
If you enter "EW engine repair" in the search box you should find an article first raised by Alwyn dated 19/1/2007 containing some very good advice.
For my own part I have a clearance of 6 thou. on my 27 EW and to date have not suffered any problems.

Good luck, Roy.

Offline Edin

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Re: Cast iron piston for EW 350
« Reply #2 on: 08 Feb 2009 at 08:58 »
Hej Roy
Thanks for your reply,- just what I need.
Your piston, is it cast iron?
Kind regards Edin DK




Quote of previous post removed - Dave, 9th Feb 2009
« Last Edit: 08 Feb 2009 at 19:36 by Dave »

Offline roy

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Re: Cast iron piston for EW 350
« Reply #3 on: 09 Feb 2009 at 17:42 »
Hi Edin,
Yes, I do not know how old they are as they were in the engine when I bought her some five years ago. Apart from a decoke they have not been touched.
I use her quite regularly, not only on runs but as a hack doing the shopping.
Best of luck, Roy.

Offline Clive

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Re: Cast iron piston for EW 350
« Reply #4 on: 09 Feb 2009 at 19:41 »
Hi All,
The infomation i have worked to, fitting solid skirt cast iron pistons to air cooled motorcycle engines is as follows lower skirt .0015 per inch of bore
depending on the number of rings
top land                                      .0035 ^^ ^^ ^^^^^
second land                                .0025 ^^^^^^^^^^
third land                                    .002    ^^^^^^^^^^
These figures are taken from an army training manual circa 1938.
The clearance of the  back cylinder in this case due to the lack of cooling is given .001 extra to the total measurement . with careful running in this has given good results in previous rebuilds.
Regards
Clive 
NZ