Guest Loose_Screws Posted July 13, 2004 Share Posted July 13, 2004 I sort of have dumb question, being that I have actually built and run a turbo Z. I replaced my stock N47 head with a P90, but either way, how does the valve guides contain turbo pressure? I just realized the other day that pressure could easily and most likely does escape around the valve guide seals. Anybody have any comment on this? Is this how everyone's setup is done? I guess I figured there would be something else there besides the valve guide seals. Quote Link to comment Share on other sites More sharing options...
Doug71zt Posted July 13, 2004 Share Posted July 13, 2004 That's one of the reasons that Max-effort turbo cars have breather catch-cans. J/K - There really isn't all that much area for the boost pressure to act on the bottom of the valve seals, so the net force is very small. Doug Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted July 14, 2004 Share Posted July 14, 2004 That plus the oil lubing the stem. If it weren't for the oild it would be worse. Definitely need good guides...A kot of guys like silicone/bronze, but I'm a big fan of cast iron for turbo apps... Quote Link to comment Share on other sites More sharing options...
Guest Loose_Screws Posted July 14, 2004 Share Posted July 14, 2004 Thanks for the info...now I understand the need for the catch cans! Quote Link to comment Share on other sites More sharing options...
Doug71zt Posted July 14, 2004 Share Posted July 14, 2004 I was planning on using ferrous guides in my new engine, but Dave Rebello told me to stay away from them in the Z head, he said that they have never worked right for him in that application. He recommended standard old off-the-shelf stuff for my P90. I've never had any problems with the bronze guides in the Z head, but I have never built a 400+ hp L engine before. I guess I will see... Doug Quote Link to comment Share on other sites More sharing options...
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