What size hole to drill for pyro?
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I just bought one of these taps today at napa (1/8 pipe tap). It says to use a 11/32" drill bit, but the instructions on genos say 5/16" and autometer say to use a 5/16" type R which is right inbetween the other 2. I'm going to try the 5/16" first and see how it goes tomorrow
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caleb. . .go with the 11/32, heck if you can find a 23/64 that would be even better. . .I think I have one laying around the house that I used.
the reason I say this is that the slightly larger size will reduce the material the tap has to go through thus makeing it easier for the tap to cut the threads
the reason I say this is that the slightly larger size will reduce the material the tap has to go through thus makeing it easier for the tap to cut the threads
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I just did this a few weeks ago and if I remember correctly I think it was a 21/64" bit and a 1/8 NPT tap. I drilled a 1/8" pilot hole and it helped a lot. Also be sure and leave the engine running when you drill and all of the shavings will be blown out instead of falling into the manifold. When I was tapping the hole I just put some grease on the tap instead of running the engine (this took a few minutes).
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