stunthanger.com
Engine basics => Engine set up tips => Topic started by: Dennis Holler on March 24, 2022, 04:11:55 PM
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Is this one of those early plain bearing .56's or is it really late. I see it has the carb screws centered on the throat versus the pinch nut I am used to seeing. What else is different between this and the later ball bearing versions? is the liner and piston the same?
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(http://sceptreflight.com/Model%20Engine%20Tests/ST%2056%20page%202.jpg)
(http://sceptreflight.com/Model%20Engine%20Tests/ST%2056%20page%201.jpg)
Far as I can figure , yours s a THIRD series . How many of the earlier four versions were differant / , good question ! .
First had lapped iron piston , and siezed a bit often in good ole U S A Summers , or the ( then ) usual close tolerance
hardened linerm took forever to run in fully . So openingem up early , they locked up .Seeing most people put them
straight in a plane and flew them .
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UNLIKELY its a SINGLE RING . ?
The two ring has the shorter rod . ( same as 51 & first 60 , single ring rods , theres two ' fits ' 51 & 60 , maybe the 56 is the 51 one .)
EARLY 60s & 46's had thinner liners , larger / smaller case bore , to fit . The 56 would be similar perhaps .
The Dual ring being the one with the thinner liner .
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Got parts catalouges , but not currently accessable . From Memory , the 56 parts swap out , B B to P B , bar where obvious ,
Im told the 56 & 60 run differant head bolt pitch circles . Wider head bolt pattern on 60s .
As Super Tigre might vary specs between runs , mikeing up ( Virneer ) check / comparison , even for the " right Part " is adviseable .
sometimes some people put production line reject parts , in the ' spares ' packets , on odd occasions . also .
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(http://sceptreflight.com/Model%20Engine%20Tests/ST%2056%20page%202.jpg)
(http://sceptreflight.com/Model%20Engine%20Tests/ST%2056%20page%201.jpg)
Far as I can figure , yours s a THIRD series . How many of the earlier four versions were differant / , good question ! .
First had lapped iron piston , and siezed a bit often in good ole U S A Summers , or the ( then ) usual close tolerance
hardened linerm took forever to run in fully . So openingem up early , they locked up .Seeing most people put them
straight in a plane and flew them .
==========================================================================
UNLIKELY its a SINGLE RING . ?
The two ring has the shorter rod . ( same as 51 & first 60 , single ring rods , theres two ' fits ' 51 & 60 , maybe the 56 is the 51 one .)
EARLY 60s & 46's had thinner liners , larger / smaller case bore , to fit . The 56 would be similar perhaps .
The Dual ring being the one with the thinner liner .
=========================================================================
Got parts catalouges , but not currently accessable . From Memory , the 56 parts swap out , B B to P B , bar where obvious ,
Im told the 56 & 60 run differant head bolt pitch circles . Wider head bolt pattern on 60s .
As Super Tigre might vary specs between runs , mikeing up ( Virneer ) check / comparison , even for the " right Part " is adviseable .
sometimes some people put production line reject parts , in the ' spares ' packets , on odd occasions . also .
Far as I know , it might be plain head , lapped .
Low finned head , various P/L
Tall finned Head , Dual Ring ( & perhaps later a single ring ? )
Have you that engine in your mitt , or is it a picture picked at random ?
ALSO there may well be the sub piston induction at the ex Port edges , with the piston at the T D C .
Opps . mw~
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I got it now, was out of town for work for a couple of weeks. It is pretty gummed up so I am soaking it now, may toss it in a crock pot if it chooses to stay stucky