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DIY Classic Mini Piston Articles
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CHECKING COMPRESSION RING GAPS
(Technical Information)
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The following chart shows the SAE recommended Automotive compression ring end gaps. These recommendations are followed for the majority of the ring line unless a certain application requires deviation from the chart. These deviations are noted in the ring section. It is unnecessary to adjust end gaps in most cases. Our ring end gaps are measured in precise gauges that are accurate to .0001" for the diameter for which the rings are intended. Remember -when fitting rings to cylinder bores, every .001" change in bore diameter changes the end gap by approximately .003." Example: A bore .002" greater than the base diameter increases the ring gap by .002" x .003" = .006". Cylinder
Diameter Ring Gap
Recommendations
2.000 - 2.999" .008 - .016"
3.000 - 3.999" .010 - .022"
4.000 - 4.999" .012...
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PISTONS - Favorable Features for Maximum Performance
(Calver's Corner)
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Having determined what sort of material best suits your needs/application, the main design and detail features of the piston now need consideration. The over-riding factor that influences just what is best for an A-Series engine is the block's propensity for flex at higher rpm, and the crank's equal propensity for flex at the same sort of rpm levels. Both combine to require a piston...
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PISTONS - Whys and Wherefores
(Calver's Corner)
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This is another
of those subjects abused for ‘bar stool b*llsh*t’ one-upmanship. Ignorance is
the main problem. Particularly as trying to get any really useful information
out of the manufacturers concerned. Try ‘phoning AE Hepolite technical. Getting
hold of someone takes real perseverance. Having achieved that meagre goal, enquiring
about piston specificatio...
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