Just doing the valve adjustment on the race car before Monterey and I'm currious. The stamped rocker manufacterer included self locking friction nuts to adjust lash. In the past I've used adjusting nuts with a set screw. Think kool nuts by Crane. In a racing application do we have any opinions on one design vs the other. it sure is easier to adjust the lash with the self locking. jerry
valve adjustor nut, locking vs self lock
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Re: valve adjustor nut, locking vs self lock
back in the day we used self locking nuts BUT we used "PAL" nuts on top of them to make sure they did not move on race engines. the posi locks have one advantage they are tall enough to make the oil from the push rod hit them and run down onto the rocker ball. i have seen if you don't have the "drippers" in the rocker covers the oil will overshoot the rocker ball and will cause them to burn. http://webcache.googleusercontent.co...&ct=clnk&gl=usLast edited by Clem Z.; July 26, 2010, 02:40 PM.- Top
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Re: valve adjustor nut, locking vs self lock
Just doing the valve adjustment on the race car before Monterey and I'm currious. The stamped rocker manufacterer included self locking friction nuts to adjust lash. In the past I've used adjusting nuts with a set screw. Think kool nuts by Crane. In a racing application do we have any opinions on one design vs the other. it sure is easier to adjust the lash with the self locking. jerryLast edited by Joe C.; July 26, 2010, 05:47 PM.- Top
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Re: valve adjustor nut, locking vs self lock
With poly locks i usually get the lash then back the nut off a 1/8th turn then hold the nut and turn in the set screw until it touches the stud. Then I turn them both the last 1/8 turn. This puts a preload on the set screw. Seems to work until I forget to tighten one set screw. This just happened to me at the Portland race. ( bent pushrod and all) You can't make this mistake with the self locking but the concern is that they will walk out. So Clem's old racer trick is the Pal nut. Now I guess I can worry about the Pal Nut loosening and going into the pan. Makes you crazy sometimes.- Top
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Re: valve adjustor nut, locking vs self lock
Just doing the valve adjustment on the race car before Monterey and I'm currious. The stamped rocker manufacterer included self locking friction nuts to adjust lash. In the past I've used adjusting nuts with a set screw. Think kool nuts by Crane. In a racing application do we have any opinions on one design vs the other. it sure is easier to adjust the lash with the self locking. jerry
GM recommends the self-locking type nut over all other types when using with stamped steel rockers arms. I do, too. This applies to both street and racing applications.In Appreciation of John Hinckley- Top
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Re: valve adjustor nut, locking vs self lock
just snug them up and never lost one. don't you have magnets epoxied in the heads to catch the pieces of valve spring that chip off and cause the small scratches you see on the cylinder walls ??- Top
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Re: valve adjustor nut, locking vs self lock
With poly locks i usually get the lash then back the nut off a 1/8th turn then hold the nut and turn in the set screw until it touches the stud. Then I turn them both the last 1/8 turn. This puts a preload on the set screw. Seems to work until I forget to tighten one set screw. This just happened to me at the Portland race. ( bent pushrod and all) You can't make this mistake with the self locking but the concern is that they will walk out. So Clem's old racer trick is the Pal nut. Now I guess I can worry about the Pal Nut loosening and going into the pan. Makes you crazy sometimes.- Top
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