GSC s1 cams with problem, should I worry?
Nov 27, 2011, 08:02 AM
#1
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GSC s1 cams with problem, should I worry?
Ok I installed my GSC s1 cams today. I took my time, I was meticulous, ensured timing was dead on etc, I also used a torque wrench on the cam caps, went over them 3 times at 15 foot pounds. Anyways this is what I got.. please take a look at the exhaust cam gear/bolt. Look how it wobbles...
http://s5.photobucket.com/albums/y15...MDA2Lm1wNA.mp4
its hard to tell, but it wobbles consitently 1-2MM. First I thought that maybe bearing clearances. I grabbed the cam gear and used my body weight when the engine was off, and I could not get anything to budge. Not to mention the valvetrain is quiet, and it is normal when revving to 7k. No extra noises or issues. It appears that the cam bearing clearances are fine.
It appears the casting was drilled 1-2MM off from center? Is this normal? how is longetivity with this because it could create some bad harmonics? Possible throw the belt? I am also going to PM Greg at GSC and see if he can chime in what he thinks.
also here is the car at idle..and it does seem to lope alot for GSC S1s at 0,0, not that I am complaining
http://s5.photobucket.com/albums/y15...MDA3Lm1wNA.mp4
http://s5.photobucket.com/albums/y15...MDA2Lm1wNA.mp4
its hard to tell, but it wobbles consitently 1-2MM. First I thought that maybe bearing clearances. I grabbed the cam gear and used my body weight when the engine was off, and I could not get anything to budge. Not to mention the valvetrain is quiet, and it is normal when revving to 7k. No extra noises or issues. It appears that the cam bearing clearances are fine.
It appears the casting was drilled 1-2MM off from center? Is this normal? how is longetivity with this because it could create some bad harmonics? Possible throw the belt? I am also going to PM Greg at GSC and see if he can chime in what he thinks.
also here is the car at idle..and it does seem to lope alot for GSC S1s at 0,0, not that I am complaining
http://s5.photobucket.com/albums/y15...MDA3Lm1wNA.mp4
Nov 27, 2011, 08:13 AM
#3
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ya everything is tight....I thought the cam gear was bent too. However that wouldnt explain the cam gear bolt to wobble as well as it is screwed right into the core of the camshaft.... It certainly appears its not the gear and its something else that has to do with the camshaft...possibly dripped/tapped off center?
Nov 27, 2011, 08:31 AM
#4
The only experience I have with gsc S1s are with a set I installed on my nephews 91 mr2 turbo. After installing them along with aftermarket cam gears set at 0, and valve springs, idle was just like stock. On his car idle has unchanged and vacuum is at around 19 in/hg. Thats a 3sgte engine, not a 4g63, but I should imagine it should be similar results. Seems like a bit of lopey idle for those cams, but they are more agressive for the 4g63 than the 3sgte variant.
Did you make sure the exhaust cam gear is pressed in all the way? tap it in carefully make sure its flush. Examine the hole and the gear itself to make sure there isnt a manufacturing flaw. Can you put back on the oem cam gear and see if it looks better?
Did you make sure the exhaust cam gear is pressed in all the way? tap it in carefully make sure its flush. Examine the hole and the gear itself to make sure there isnt a manufacturing flaw. Can you put back on the oem cam gear and see if it looks better?
Nov 27, 2011, 08:46 AM
#6
Maybe it is because I just woke up or something but I really don't see anything that looks out of place. I watched the video 5 times and I can see the bolt looks like it moves but if there tqed down to spec then I don't really see a problem. As long as you dont hear the cam gears hit, or the cam caps to tight causeing the cams to eat the cam surface I really wouldn't worry about it.
Nov 27, 2011, 08:49 AM
#7
Check the bolt your using--check under the cap to be sure its not off center and then roll the bolt on a flat surface with your hand to see if it somehow got bent, head got bent, or twisted off center--may have been something you didnt noticed before but do now that you are looking at it.. Make sure the pin is all the way in the cam and the sprocket is flush with the cam face.
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Nov 27, 2011, 08:55 AM
#8
Maybe it is because I just woke up or something but I really don't see anything that looks out of place. I watched the video 5 times and I can see the bolt looks like it moves but if there tqed down to spec then I don't really see a problem. As long as you dont hear the cam gears hit, or the cam caps to tight causeing the cams to eat the cam surface I really wouldn't worry about it.
Last edited by vmrevo9; Nov 27, 2011 at 08:59 AM.
Nov 27, 2011, 09:04 AM
#9
I know what he was asking and I agree with everything you said. Thing is it doesn't look like its anything really bad. I mean it could be an illusion being the wear on the bolt head. If the the breaker bar slippted some or whatever it could make a pattern on bolt head. Don't ask how I know about that one hahaha. Had to order new bolts cause I rounded one off by accident tring to get mine off. Not saying that is the problem being I watched it again I just don't seem to think there is an issue. If your really that worried about it, take the valve cover back off and redo all the cam caps one at a time and see if it changes.
Nov 27, 2011, 09:21 AM
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I know what he was asking and I agree with everything you said. Thing is it doesn't look like its anything really bad. I mean it could be an illusion being the wear on the bolt head. If the the breaker bar slippted some or whatever it could make a pattern on bolt head. Don't ask how I know about that one hahaha. Had to order new bolts cause I rounded one off by accident tring to get mine off. Not saying that is the problem being I watched it again I just don't seem to think there is an issue. If your really that worried about it, take the valve cover back off and redo all the cam caps one at a time and see if it changes.
Nov 27, 2011, 09:26 AM
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Check the bolt your using--check under the cap to be sure its not off center and then roll the bolt on a flat surface with your hand to see if it somehow got bent, head got bent, or twisted off center--may have been something you didnt noticed before but do now that you are looking at it.. Make sure the pin is all the way in the cam and the sprocket is flush with the cam face.
Ok lets say the bolt head is bent....with the cam gear flushed it shouldn't wobble either right? The cam gear certainly is wobbling as well. It also doesnt wobble like it was bent...it wobbles like its out of round....I can see why you can only see the bolt...as the video is so dark..but the gear is definately moving as well.
It would be very hard to bend that 12MM bolt..I seriously doubt I am strong enough for that.....but I guess I can check it.
Last edited by mean4g63; Nov 27, 2011 at 09:43 AM.
Nov 27, 2011, 10:15 AM
#15
I know it seems like alot of work but to be safe I would put the stock ones back on and see if it does the same thing. If so then you know it is another issue not the cam gears. I mean for as much as we pay for cams and what nots I think it would be a safe idea that won't cost you any money, but a little of your time. That in itself would be worth it if you wanted to be sure everything is good.