64c10ls1

Installing a new Comp cams 189 core in a new 2012 Silverado with a 6.2L with the correct 6358 actuator and correct stop. I checked the stock cam for ***** and grins and it was installed at 108 Int Center line, the exhaust was at 118 center line, making for a LSA of 113. That means the stock cam was advanced 5 degrees. The tune retards it back 8 degrees at 6000 rpm so it should be redarded 3 degrees at that point.

The problem I have is when I checked the new cam it is installed at 118 ICL. The cam was ground with 116 LSA and suggests installing it at 110 ICL or advanced 6 degrees. This means I am 8 degrees slow from what is desired to give me good low end torque. I can only retard timing in the tune. If I advance the cam one tooth that makes 16.4 degrees difference so it would be at 102 ICL at that point. I could add 8 degrees retard to my entire tune except some of the highly retarded part throttle settings. I really don't think that is the best idea but I am open to any suggestions. Comp cams isn't really giving me much help yet, they are working on it.

85MikeTPI

iTrader: (9)

Can you explain how you came to the conclusion that you're "8 degress slow" and how you know what cam advance value gives you the best low-end torque ?

64c10ls1

The cam is supposed to be installed at 110 ICL per the card. It was ground with a 116 LSA for the blower I am installing and stock type idle. That would make it 6 degrees advanced from straight up. It checks out at 118 ICL with the actuator in the parked fully advanced position. I am not exactly sure what centerline gives me the best low end torque but I don't think retarded 2 degrees from straight up is best.

85MikeTPI

iTrader: (9)

That makes more sense. Send it back...

64c10ls1

Do you need to modify the actuator to stay in the parked advanced position when degreeing a cam??

It seemed to be pretty hard to retard it with the spring pressure on it. The fact that the stock cam seemed to degree in about to what I thought it should makes me think there is just something wrong with the pin location on the new cam. Now to get comp to agree with that.

64c10ls1

I could put a block in the other side of the actuator on the advanced direction equal to 8 degrees and then advance the cam one tooth and then thin down the comp cams stop to give me back the 22 degrees it had in it????

85MikeTPI

iTrader: (9)

If the cam is ground wrong, I don't know why you would even want/have to hack together a solution ?

https://ls1tech.com/forums/generatio...g-vvt-cam.html

Has info on checking/degreeing a VVT cam and PTV checks.

64c10ls1

I agree completely. Getting the sales guy to admit to that is another story. He keeps saying no one but me has ever had this problem, but then they tell me it was ground with no advance, but then he says that it is preground into the cores they get and cant be changed. IDK what to do. It is really pissing me off.

SweetS10V8

iTrader: (4)

Ask to send it back and have it put on the Adcole. Suggest that if it is off, you dont pay for adcole and get a different cam with a new adcole sheet.

If it is Adcoled and turns out to be ground correct, youll pay for the Adcole test.

Che70velle

iTrader: (6)

Who spec'd your cam?

64c10ls1

I speced the cam with my comp sales rep. He figured out the 116 LSA we ordered did not have enough room on the core to advance it. They ground it with 0 advance instead of 6 like I asked. Ordered a 114 LSA cam with 7 degrees advance built in. They are taking the first one back so all is good. Heck who knows the other one might have worked fine with a blower but now I have room to play around with it and see what it likes with the cam tune.