.005 of press fit? That seem like a bit much to me. When I was doing machine work general rule of thumb for press fits was .001 per 1" of shaft diameter. .750 shaft would be .00075, but I would have probably made it .001 for a little extra fit. JMHO

 

It was just a guess. Just from pulling them in the past, they are on there pretty tight. You are right, being a small shaft a .001-.002" may be closer.
I've been out of the machinist business for 6+ years, i'm a little rusty.

I like the name on the quote.

 

... key is that the final bore diameter needs to be something that ATI can live with. I am certain they have their own tolerances for the materials being used. It sure would be nice if the vendors were privy to manufacturing tolerances of the shafts coming from either GM or their foundry. Maybe I'm splitting hairs...

Has anybody been able to confirm whether or not the 3/4 ton power steering pumps are the same as the 1/2 tons? Steering racks are completely different... just wondering out loud if the pumps are different.

FWIW, I have not heard of one single issue with ATI's 8rib power steering pulley on the C5's... solid products for sure.

Bill

 

from eye-balling it, it looks like everything will line up where it needs to pulley groove-wise........, just wish I had more confidence in my old micrometer

 

I don't know how that happened, Honest, I didn't do it.

 

using my caliper I measured the shaft OD @ 19mm and the pulley ID @ 18.9mm

 

Hey Grip. Converting the metric to decimal I use www.onlineconversion.com It says that the 19mm = 0.748".
And the 18.9mm= 0.744".
You've got .004" press. Approximately............
This is really nice detail on an often overlooked item. Thanks for being so thorough.

Richard

 

thanks Richard, I need to get a better micrometer, one that measures out to .0000

 

Got a few things done today. Installed the starter, inner fender wells, battery tray, intake box brace, intake box housing, radiator support brace, trannsmission cooler brace, hood latch, and the front bumper.

 

FYI for anyone wanting to run a 6, 8, 10, 12 rib setup:

Got this email from ATI:

"We do make 8" diameter dampers fairly often. We do stock 7.5", 6, 8, 10, 12 and HTD shells though for LS1 applications. And the 8 - HTD are complete kits of pulleys. Our work with the LS1 engines started a long time ago but I have don a lot of testing on the C5R and C6R engines for Katech, and we were also the stock damper on the ASA Series sealed LS1 engines. Most recently Carl Wegner uses our damper and crankshaft pin kit on the New NASACAR Bush East engines."