Thread: ring gap

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The Icons send out a chart and it depends on use

well yes but more will not hurt 005x bore size is fine on a street rod yes i go by the chart and pat mccarthy chart as well bigger gap never hurts .but less will...watch the problems you will have. on bore its Pie or very close but fast way is to think 001 more wall clearance = 003 ring end gap most guys will not put the pistons in at low end spec.. so adding more piston to wall you end up with more gap so file rings many times are a wast of money if you still need more end gap then you can file the drop in rings

That makes sense, Pat. When he told me to add more gap my first thoughts were that you would get leakage past there, but he said no way. He also said they see only about 3 hp difference between tighter gaps and more gap. Aside from the obvious fact that drop in rings call for no filing normally, what makes them different so that you don't need to do that?

Don

well post 13 should tell you why there a need and how it works? there not a drop in ring s you should check all ring gap i do this on every engine stock and race. the drop in are pre gap for lets say 4.000 bore and = 016 end gap .if the bore is smaller by 0001 then the gap will be about 013 to small now if the piston to wall been open up lets say 4.001 your pre gap rings will about 019 i buy pre gap rings and cut them if need for the intend use blower . nos . drag race .there no one size fits all 005 over rings are for fitting the rings if bore s are bigger and most race rings only come this way so you end gap them to what ever size you want .agood wast of time i spent most of the day cutting 030+ off a set of race rings and ...020+ off the second ring on .043 thick rings in a engine that will see over 500HP of Nos so heat make s them grow and i do not want to see them butt . there is no EZ way out i check evey hole if need i cut rings to the gap i what.. this is the way i build the stock and race

Thats the chart I used gary, it work out .028 min at the top, .017 2nd conpress ring min, so I called KB they said go .030 on the top and .019 on the 2nd ring, just in case it gets to hot. they said .038 would be the max top ring gap. .030 over 454= 4.280 X 0.0065=0.02782 or .028 for the top and .004x4.280= 0.01712 or 0.017 for 2nd ring.