PTV checking with VVT cam
#22
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#23
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Cleaning up my post since most of it was completely wrong.
1) Apparently my Cam Card is already adjusted for the Base 7deg Advance. The L99 phaser degree'd to the Cam Card when installed straight up and no wedges.
2) Contrary to the CompCams warning, there's NO pin offset between my L92 and L99 phasers. The L92 phaser comes up 17deg Advance base on my L99 cam. It was exactly 10deg advanced from the L99 phaser.
It's definitely a different phaser (L92 vs L99), so the warning may be related to the LY6 phaser ???
1) Apparently my Cam Card is already adjusted for the Base 7deg Advance. The L99 phaser degree'd to the Cam Card when installed straight up and no wedges.
2) Contrary to the CompCams warning, there's NO pin offset between my L92 and L99 phasers. The L92 phaser comes up 17deg Advance base on my L99 cam. It was exactly 10deg advanced from the L99 phaser.
It's definitely a different phaser (L92 vs L99), so the warning may be related to the LY6 phaser ???
Last edited by 85MikeTPI; 06-15-2012 at 08:16 PM.
#27
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Called CompCams and they couldn't give me any info on my finding and even suggested that the COMP4-133 Technical bulletin was given to them by GM and was never verified? Anyone have a verifiable 12585994 phaser they'd like to donate to the cause, I'll pay shipping?
I've read conflicting information about the early 6.0l VVT (LFA?) actuator, the early 6.2l VVT actuator, and the late model 12606358 actuator that all the 5.3l, 6.0, 6.2l engines use now. It leads me to believe that there are actually 3 types, but no part numbers to back it up.
The problem is more confusing because my original 2007 L92 phaser has NO part numbers on it.
The 3 phasers I've found references to, have:
- 62 degrees of authority, from 17deg Advance to 45deg Retard
- 46 degrees of authority, from 17deg Advance to 29deg Retard
- 52 degrees of authority, from 7deg Advance to 45deg Retard
I've read conflicting information about the early 6.0l VVT (LFA?) actuator, the early 6.2l VVT actuator, and the late model 12606358 actuator that all the 5.3l, 6.0, 6.2l engines use now. It leads me to believe that there are actually 3 types, but no part numbers to back it up.
The problem is more confusing because my original 2007 L92 phaser has NO part numbers on it.
The 3 phasers I've found references to, have:
- 62 degrees of authority, from 17deg Advance to 45deg Retard
- 46 degrees of authority, from 17deg Advance to 29deg Retard
- 52 degrees of authority, from 7deg Advance to 45deg Retard
#28
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TSP VVT2 cam
Finished my PTV checks. My Mahle L92 pistons have Intake valve reliefs (.220) and slightly deeper Exhaust reliefs (.150) compared to stock Exhaust relief (.120). I locked my unsprung L92 phaser at 15deg retarded. I used my L99 phaser for the 7deg advance base.
Base Cam timing of 7degrees Advanced:
Intake: 0.295
Exhaust: 0.260
Cam timing fully retarded to limiter block (22deg ) of 15degrees Retarded:
Intake: 0.335
Exhaust: 0.195
-----------------
These would give approx stock results:
Base: I/E 0.075/0.230
Full Ret: I/E 0.115/0.155
Which seem kinda tight on the Intake side, though Intakes chase the piston and don't usually have PTV issues. Also my pistons are 0.016 out of the hole and stock pistons may gain additional clearances there.
At least I know I can go with a much bigger cam if I decide to..
Finished my PTV checks. My Mahle L92 pistons have Intake valve reliefs (.220) and slightly deeper Exhaust reliefs (.150) compared to stock Exhaust relief (.120). I locked my unsprung L92 phaser at 15deg retarded. I used my L99 phaser for the 7deg advance base.
Base Cam timing of 7degrees Advanced:
Intake: 0.295
Exhaust: 0.260
Cam timing fully retarded to limiter block (22deg ) of 15degrees Retarded:
Intake: 0.335
Exhaust: 0.195
-----------------
These would give approx stock results:
Base: I/E 0.075/0.230
Full Ret: I/E 0.115/0.155
Which seem kinda tight on the Intake side, though Intakes chase the piston and don't usually have PTV issues. Also my pistons are 0.016 out of the hole and stock pistons may gain additional clearances there.
At least I know I can go with a much bigger cam if I decide to..
#29
When I install my VVT3 camshaft I will be using the Comp Cams phaser limiting block. So my question is when checking the PTV clearance do you do it with the phaser resting against the newly installed "block" or limiter?
Last edited by 1989GTA; 06-26-2012 at 08:55 PM.
#30
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(my testing phaser is on the shelf now and I'd be happy to send it out if you pay shipping and return it when done. Fit in a flat rate USPS box I'm sure..)
#31
I will probably be doing this in the next couple of weeks. It will depend if my pully remover will work on removing the L92 balancer. The motor is on an engine stand. That might be a problem when I go to torque the thing back in place at 240ft-lbs.
Then again does not the Comp Cams Phaser limiter prevent the camshaft from retarding it that much? Maybe I only have to do the advance portion.
Then again does not the Comp Cams Phaser limiter prevent the camshaft from retarding it that much? Maybe I only have to do the advance portion.
#33
Thanks, I have a 3 jaw and hopefully it will work. I think I have it backwards in the above post. Does not the limiter limit how far the cam is advanced? With no oil press the cam is retarded as far as it will go. See if I have that right.
#34
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The pics in this thread actually show the back (cam) side of the phaser, so the pics rotation are backwards relative to when installed.
Last edited by 85MikeTPI; 06-27-2012 at 03:01 PM.
#35
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Phaser # 12585994 uses Comp limiter kit #5456, 156 core
Phaser # 12606358 uses Comp limiter kit #5460, 189 core
I discovered last night I have the wrong limiter kit for my phaser, but I did get the right cam core. Hopefully TSP will exchange it for me.
#36
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Regarding the possible LY6 difference, my '07 LY6 has the -358 phaser whereas I think tiresmokinV8's LY6 has the -994 phaser. I don't think the phasers are engine/family specific.
The pin location may look the same but be different relative to the vanes or relative to the encoder wheel. Whatever the case, I would make sure you have a matched set. I wish the information on this wasn't so spotty. Thanks for doing what you're doing to find out where things stand.
#37
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I don't really understand this statement. Rather than refering to these as L92 and L99 phasers, can you refer to them by their P/Ns? The -994 phaser and the -358 phaser. Are you saying there was a 7deg difference between the two phasers you tried?
Regarding the possible LY6 difference, my '07 LY6 has the -358 phaser whereas I think tiresmokinV8's LY6 has the -994 phaser. I don't think the phasers are engine/family specific.
The pin location may look the same but be different relative to the vanes or relative to the encoder wheel. Whatever the case, I would make sure you have a matched set. I wish the information on this wasn't so spotty. Thanks for doing what you're doing to find out where things stand.
Regarding the possible LY6 difference, my '07 LY6 has the -358 phaser whereas I think tiresmokinV8's LY6 has the -994 phaser. I don't think the phasers are engine/family specific.
The pin location may look the same but be different relative to the vanes or relative to the encoder wheel. Whatever the case, I would make sure you have a matched set. I wish the information on this wasn't so spotty. Thanks for doing what you're doing to find out where things stand.
Saying there is a pin difference. While there may be a diff in either
The cores or the phasers, I found there's not a diff in both.. I used
My '07 L92 phaser (I refer to it this way because it has no PN on it
that I can find) and it degreed at 17 deg base with my 189 core cam.
This is exactly what a 156 core cam should degree to on this L92
Phaser.
I was expecting a pin diff in both so that I would see the 13deg change
In mixing core&phaser, but I did not. The tech bulletin really needs to
More clear about where the 13deg change would come in..
To confuse even more, there are diagrams on the HPTuners site about
A LFA 6.0L phaser having different specs than either of the Early and
Late model phasers that the bulletin calls out...
I agree we need more data, I'm just sad my chance at providing it
Has passed since my long block is going to be installed this weekend..
[edit: I cleaned up the L92 phaser and finally found the faint 12585994 part number. So it only goes to question where the 13deg difference comes from in the bulletin? I found it to be the 10 deg diff I was expecting since it moved the VVT2 cam back from 7deg adv base, to 17deg adv base putting the -994 phaser on a 189 cam core...]
The statement from the Comp 133-4 bulletin that I reference is:
"The difference in camshaft core is the pin to centerline position. The difference in pin between 156 and 189 equates to 13 degrees camretard (if a 156 is used where a 189 is required)."
So I can surmise that since they talk camretard, they are talking about someone ordering/using an older 156- core on a -358 phaser, but my testing shows that this would only cause 5 deg camretard (10 deg crankretard)
http://www.hptuners.com/forum/showth...t=17883&page=2 is the hptuners link I reference that has phaser/actuator diagrams from Alldata..
Last edited by 85MikeTPI; 06-28-2012 at 10:35 AM.
#38
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Cleaning up my post since most of it was completely wrong.
1) Apparently my Cam Card is already adjusted for the Base 7deg Advance. The L99 phaser degree'd to the Cam Card when installed straight up and no wedges.
2) Contrary to the CompCams warning, there's NO pin offset between my L92 and L99 phasers. The L92 phaser comes up 17deg Advance base on my L99 cam. It was exactly 10deg advanced from the L99 phaser.
It's definitely a different phaser (L92 vs L99), so the warning may be related to the LY6 phaser ???
Attachment 358917
Attachment 358918
Attachment 358919
Attachment 358920
Attachment 358921
1) Apparently my Cam Card is already adjusted for the Base 7deg Advance. The L99 phaser degree'd to the Cam Card when installed straight up and no wedges.
2) Contrary to the CompCams warning, there's NO pin offset between my L92 and L99 phasers. The L92 phaser comes up 17deg Advance base on my L99 cam. It was exactly 10deg advanced from the L99 phaser.
It's definitely a different phaser (L92 vs L99), so the warning may be related to the LY6 phaser ???
Attachment 358917
Attachment 358918
Attachment 358919
Attachment 358920
Attachment 358921
Thanks,
Mike
#40
TECH Regular
iTrader: (22)
Exactly what I was talking about! Thanks for posting pics for everyone. Ive had to explain this a few times and will reference back to the pics from now on!
Phaser # 12585994 uses Comp limiter kit #5456
Phaser # 12606358 uses Comp limiter kit #5460
Be very careful when reinstalling the phaser for the final time, take extra time to be absolutely sure the alignment pin is aligned with the hole on the back of the phaser. Hope you have a 5 ft breaker bar! IIRC its 48lb*ft plus 90 degrees!!!!
Does the Texas speed cam come with the long bolt, like Comps does?
Phaser # 12585994 uses Comp limiter kit #5456
Phaser # 12606358 uses Comp limiter kit #5460
Be very careful when reinstalling the phaser for the final time, take extra time to be absolutely sure the alignment pin is aligned with the hole on the back of the phaser. Hope you have a 5 ft breaker bar! IIRC its 48lb*ft plus 90 degrees!!!!
Does the Texas speed cam come with the long bolt, like Comps does?
My TSP VVT 3 cam did not come with the long bolt?
Is the bolt reqd to do the cam swap?
Thanks,
Mike