Subject	I've had this problem on my '93 NA
Posted by	OverZealous (CT) on March 01, 2013 at 9:31 PM
	This message has been viewed 308 times.
In Reply To	I am just now reading JWT's spline replacement posted by ae300z on March 01, 2013 at 03:23 PM
Message	Took the heads to the shop. When the machinist took the measurements he said it was pretty obvious and made the necessary adjustments. If you go back through my old posts you will find that I even tried to recognize the problem beforehand using an oscilloscope with moderate success. The CAS measurement itself -- which directly impacts timing -- seemed erratic. Timing is extremely sensitive to CAS inconsistencies! I don't see how the JWT cam has anything to do with this. Your stuff doesn't look that worn. In my case I had a fair amount of rust but not like Woody's picture. Are you sure the CAS isn't in any way moving? How much is timing "moving"? If misalignment is your problem unfortunately you'll have almost no way to confirm that's you problem beforehand and will eventually have to make the call when to dig into the engine. Go in only as a last resort. OverZealous (CT) My General posts (click) My Technical posts (click)
Follow Ups	JWT 500 cam CAS spline problem? - ae300z 13:52:39 03/01/13 CAS is worn out - sometimes caused by cam alignment - Bernie (NoVA) 14:02:22 03/01/13 I would have thought you would have told me the spline - ae300z 14:28:39 03/01/13 CAS looks fine. (n/m) - Bernie (NoVA) 20:23:28 03/01/13 So I just want to clarify this, the cause of the problem - white22sky 14:53:26 03/01/13 Re: So I just want to clarify this, the cause of the problem - Mike TDK (NoVA) 15:20:38 03/01/13 Thank you sir (n/m) - white22sky 15:57:12 03/01/13 Good info! (n/m) - VERTTZ 15:59:01 03/01/13 I am just now reading JWT's spline replacement - ae300z 15:23:41 03/01/13 I've had this problem on my '93 NA - OverZealous (CT) 21:31:47 03/01/13 Unfortunately it seems the misalignment can be either - ZXoltan 17:19:41 03/01/13 No not at all - white22sky 21:21:02 03/01/13 Doesnt look that worn. - Woody75 (Denver) 15:06:02 03/01/13 ouch, that looks nasty. (n/m) - ae300z 15:18:36 03/01/13 Amateur. - Stadsport (Nick@CZP) 13:16:30 03/02/13 You sir.. have no teeth or nothing there.. (n/m) - My300zx 16:33:11 03/02/13 When did you buy your jwt 500 cams? - VERTTZ 15:09:31 03/01/13 Bought them from IPP January 2010. Have you heard - ae300z 15:16:24 03/01/13 Yes there are issues known by a few and the timing of your - Only1Z 12:32:52 03/02/13 Can you elaborate further on the known issues? I have - ae300z 10:19:48 03/03/13 Well... - Only1Z 12:27:07 03/03/13 My issue is centered around the cam and CAS spline wear. - ae300z 14:59:26 03/03/13 I think you're confusing 2 different issues... - Bernie (NoVA) 19:57:32 03/04/13 Yes which is why I said this might not be related at all to - Only1Z 00:23:18 03/05/13 Just curious, are you checking your timing with a - michaell32 (FL) 17:35:54 03/01/13 base timing is what is moving. The ECU does not effect - ae300z 18:02:59 03/01/13 TPS can also affect timing. Did you press the pin yourself? - RevTech 21:31:40 03/01/13 The base timing that is set with the CAS is my problem. - ae300z 09:54:06 03/02/13 Whats TIR? Did the TPS voltage move also? - RevTech 18:59:47 03/02/13 TIR is .016, TPS is good, set timing off #1 cylinder. (n/m) - ae300z 23:35:33 03/02/13 Unfortunately there are bad batches of 500 cams out there. - Only1Z 12:28:31 03/02/13 Thank you! Very true. My Sport 700 Comp. Flange Leaked! - ZinnZ32 17:22:23 03/02/13 Your turbo flange issue has nothing to do w. the topic at - Bernie (NoVA) 19:52:33 03/04/13 Do you have any documention or examples to back this up? (n/m) - Bernie (NoVA) 19:59:09 03/04/13 Someone I know who directly spoke to a more than - Only1Z 00:05:15 03/05/13 We used to play this game as kids called telephone... - Bernie (NoVA) 13:42:17 03/05/13 All I've said is that a popular member here has said to - Only1Z 21:28:03 03/05/13
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