ta for that 156D
Re the ref to old engine books any isbn No's
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- Mon Jan 12, 2009 7:32 pm
- Forum: Lambretta Tech
- Topic: Thrust Faces
- Replies: 41
- Views: 12467
- Sun Jan 11, 2009 11:29 pm
- Forum: Lambretta Tech
- Topic: Thrust Faces
- Replies: 41
- Views: 12467
Re: Thrust Faces
the most important thing is to not widen inlet too much ,as this of course leaves less support either side for piston.............. piston holes can only be in line with this.......... have seen pistons that have been cut as a reverse V instead of having windows, this will reduce the support the of...
- Sun Jan 11, 2009 11:08 pm
- Forum: Lambretta Tech
- Topic: Thrust Faces
- Replies: 41
- Views: 12467
Re: Thrust Faces
sean brady scooters wrote:you may both like to read up on" piston pin offset"...................
interesting stuff.
not come across this yet, any references
- Sun Jan 11, 2009 11:07 pm
- Forum: Lambretta Tech
- Topic: Thrust Faces
- Replies: 41
- Views: 12467
Re: Thrust Faces
as far as i understand it.................on power stroke ,the ex side of piston is "major "thrust surface.............this is in effect pressed down (above gudgeon pin)..........and so inlet skirt side is pressed up (below gudgeon pin)...............this has the effect of scraping the oi...
- Sun Jan 11, 2009 10:14 pm
- Forum: Lambretta Tech
- Topic: Thrust Faces
- Replies: 41
- Views: 12467
Re: Thrust Faces
basically dave.........a longer con rod will reduce side thrust..........major and minor...... and for eg ..........a short stroke/short con rod set up will suffer most.......... also i wonder why your interested in this question......and hope your concerns are not confused with excessive bore wear...
- Sun Jan 11, 2009 9:39 pm
- Forum: Lambretta Tech
- Topic: Thrust Faces
- Replies: 41
- Views: 12467
Re: Thrust Faces
Got that :) but here goes again and where i really started to confuse myself as the conrod descends is the thrust on one side totally ie the exhaust side or does the piston tilt slightly so rings exhaust side and skirt on inlet sorry to waste your evening smiffy explaining the basics to a numpty :lol:
- Sun Jan 11, 2009 9:26 pm
- Forum: Lambretta Tech
- Topic: Thrust Faces
- Replies: 41
- Views: 12467
Re: Thrust Faces
God im thick 
but here goes, on the power stroke surely the rod is moving towards the inlet side
but here goes, on the power stroke surely the rod is moving towards the inlet side
- Sun Jan 11, 2009 8:32 pm
- Forum: Lambretta Tech
- Topic: Pistons pls fill in the gaps
- Replies: 2
- Views: 2316
Re: Pistons pls fill in the gaps
Wiseco part no 431 70-72mmralph95 wrote:honda cr 250 78-80
ta Ralph
- Sun Jan 11, 2009 7:45 pm
- Forum: Lambretta Tech
- Topic: Thrust Faces
- Replies: 41
- Views: 12467
Re: Thrust Faces
someone must know, its driving me mad trying to think it out 
- Sun Jan 11, 2009 7:34 pm
- Forum: Lambretta Tech
- Topic: Pistons pls fill in the gaps
- Replies: 2
- Views: 2316
Pistons pls fill in the gaps
Rather a few gaps too fill in im afraid, any other suggestions Model.......Year........Wiseco Ref.........Sizes......Small end......Comp height....Rings......Ports...........Rod RM250......1976...........366................70-72........18..................26.............2...........N.........Yam out...