The Ford Barn

RonLey · 06-03-2016, 08:45 PM

I took the rods over to a local model a engine builder that check them on his connecting rod jig that checks alignment.

George Miller · 06-03-2016, 08:57 PM

With out seeing what you have it is hard to say. But your ring gap is to tight for a Model A. Also in my book you need at least .0035 clearnce on your piston. Again .001 per inch of bore. You Will find that a long stroke engine with a big bore is hard to turn when rebuilt. There is a lot of ring drag and with a long stroke the piston speed is much faster than a short stroke. That makes it hard to turn.

mike657894 · 06-03-2016, 09:46 PM

measure the pistons and the bores. and if you dont have that equipment take it to who did your boring. because it sounds like either your bores or your pistons are not what you think they are.

06-03-2016, 08:45 PM	#1
RonLey Member Join Date: Dec 2012 Posts: 51	Re: Engine Tolerance and Tightness I took the rods over to a local model a engine builder that check them on his connecting rod jig that checks alignment.

06-03-2016, 08:57 PM	#2
George Miller Senior Member Join Date: May 2010 Location: NC Posts: 2,975	Re: Engine Tolerance and Tightness With out seeing what you have it is hard to say. But your ring gap is to tight for a Model A. Also in my book you need at least .0035 clearnce on your piston. Again .001 per inch of bore. You Will find that a long stroke engine with a big bore is hard to turn when rebuilt. There is a lot of ring drag and with a long stroke the piston speed is much faster than a short stroke. That makes it hard to turn.

06-03-2016, 09:46 PM	#3
mike657894 Senior Member Join Date: Oct 2015 Location: Bay City Michigan Posts: 1,050	Re: Engine Tolerance and Tightness measure the pistons and the bores. and if you dont have that equipment take it to who did your boring. because it sounds like either your bores or your pistons are not what you think they are.