Thread: Need some valve train help.

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2012-12-12 01:32:56

#81

WingmanSR20 Online/offline status of WingmanSR20 is unknown

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Originally Posted by lynchfourtwenty

cams can be a pain in the ass, but they aren't that difficult.. if my dumbass can do it then other dumbasses can too! hehehe

Truth be told.

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2012-12-12 01:33:32

#82

Storm88000 Online/offline status of Storm88000 is unknown

Oh well....

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Oh, I've done them in the SR20 about 8 times. One time was a disaster, the rest good

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2012-12-12 01:34:43

#83

lynchfourtwenty Online/offline status of lynchfourtwenty is unknown

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yeah, i've already told my whoopsy story in the other thread, wont make that boo boo again and atleast it was on my own car an not someone elses.. damn females..

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2012-12-12 02:09:18

#84

Trey2

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Cool beans

Last edited by Trey2 on 2012-12-12 at 02-09-48. Reason: haters...

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2012-12-12 14:58:24

#85

hammerin hank Online/offline status of hammerin hank is unknown

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Originally Posted by Storm88000

Originally Posted by ashtonsser
Most people dont realize how important it is to loosen the cam cap bolts a turn or so at a time and to do it evenly down the line. The cam can bend very easily if you dont do it properly.

THIS!!!!! I am freeing paranoid in loosening and retightening, almost to a level of OCD. Another reason why it says "cams are a pain the ass" under my screen name, they really are, in this motor. Sure it's more difficult in new cars and motors with all the stuff you need to remove first, but still.

I'm pretty confident the way I'm installing and uninstalling is the proper way of doing things (FSM to the tee). If it wasn't, I'd have the same issue with the stock cam. There's something happening here that's out of the ordinary that I'm missing. Since the issue is isolated to only one cylinder, and the cam is not bent, my attention has turned to the #4 HLA not working properly. My theory is it's not getting enough oil pressure to release the check ball inside, thus not adjusting the rocker down to the proper height. Once I get another chance I'm going to blow some air through the oil port in the head and see what happens. I doubt it's the oil pump since the other 3 HLA's seem to be working fine.

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S62...huh?

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2012-12-12 20:15:17

#86

lynchfourtwenty Online/offline status of lynchfourtwenty is unknown

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i would think if it was a problem with the head or HLA it would do it with the stock cam aswell tho?

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2012-12-12 21:25:14

#87

hammerin hank Online/offline status of hammerin hank is unknown

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Originally Posted by lynchfourtwenty

i would think if it was a problem with the head or HLA it would do it with the stock cam aswell tho?

I think what may be happening is the HLA check ball isn't opening because the S3 cam is compressing the HLA when it's being bolted down. Remember it's .012" larger than stock. The pressure in the HLA chamber is more than the oil pressure can overcome, so it never decompresses (ie. adjusts itself). The stock cam base circle is slightly smaller so there's not as much HLA chamber pressure and it opens. That's my current theory, anyways.

This is a good writeup/picture of how the checkball operates: HLA Theory of operation

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S62...huh?

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2012-12-12 21:42:41

#88

Kyle

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Re-install and rotate engine by hand a few revolutions and see what is happening afterwards? I never used to rotate my engine after a cam install. Now, I do all the time.

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2012-12-12 21:53:35

#89

hammerin hank Online/offline status of hammerin hank is unknown

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Originally Posted by Kyle

Re-install and rotate engine by hand a few revolutions and see what is happening afterwards? I never used to rotate my engine after a cam install. Now, I do all the time.

I rotated it a few cycles after i installed it. i also rotated when i was testing for valve leak. That's how i discovered the valves where open on the compression/power stroke.

Last edited by hammerin hank on 2012-12-12 at 21-54-15.

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S62...huh?

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2012-12-12 22:04:32

#90

Kyle

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Curses. I am still highly interested in what is wrong.

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