350/255HP Help please

[Alan Roehrich]

Originally Posted by Mark Ugrich

Alan, could you describe how the Dwyer gauge works?Is it basically installed like a vacuum gauge? I've never heard of one.Looks like there are several different calibrations.Which is correct to use to measure ring seal as you described? Thanks,Mark

Mark, if memory serves correct, you want one that reads 0-10 scfm. The 12" tall model is probably the best.

What you do is connect the gauge to the only outlet where any crankcase pressure can escape from the engine, everything else must be completely sealed. The easiest way is to connect the gauge to a breather with a tube outlet, such as the one used in a crank case evac kit. The gauge must be mounted perfectly vertical.

You then make dyno pulls as you normally would. We normally use our vacuum and or evac system for a while to seal the engine up, then after we've got it where we want it and tuned, we make a couple of pulls with the Dwyer gauge on it to make sure it is sealed up.