Thread: ring gap questions

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Pat's got a good proceedure. Torque plates are hard to beat especially when used with temp compensation for round and straight bores.

I worked in the Ford diesel plant for a while and ran the hone that did the 6.0 blocks. One block per minute. The first step is about .0040 from final size, one stroke in and out takes out about .0025. Stage 2 is the medium stones and takes out about .0010. About 15 strokes. The final sizing .0005 puts the final bore finish and size. Held to around .0001/.0002 for all 8 cylinders at a given temp. Cylinders were round and straight within about .0002 as I recall. The machine was nearly 200 feet long and fully computerized. It would do these all night long and not require adjustment. Bore sizes were done with an air gage accurate to .00002 4 zero's with 2!! Temp compensated. Finish was also checked top middle and bottom at the same time and all 8 were the same and to spec or something was wrong and the line shut down. no torque plate but the main girdle was on and torqued. Not bad for a production motor.

It took about 8 hours to get the machine temp stabilized so it was not shut down except for a good reason.