LNFwagonSS

EDIT: this is NOT the stage 1 cam. It is just the upgraded fuel lobe cam.

So I picked up a ZZP fuel lobe cam from a member here. He stated that the cam was never installed in his car and this is how he received it from ZZP. The fuel lobe looks rather sketchy. It's not smooth but it's not too rough. I don't know exactly how the hpfp contacts the cam lobe so I would like some feedback. Did anyone else's fuel lobe cam look like this before they installed it?

09CobaltSS1

The hpfp uses a tappet style plunger to actuate the pump. Not roller rockers like the rest of the valve train. It looks relatively rough to me, however not terrible. I'd personally polish that journal down to a gloss as to not have excessive wear and metal in the engine. That's just me though.

I strangely feel as though I've been here before with you..

LNFwagonSS

I remember you saying it was a tappet style. I'm still not sure exactly how the contact is made. I kinda have an idea but I would like to see a pic of the hpfp plunger where it contacts the lobe. Thanx again for the info you gave me in the pm, very helpful john. Still want to know if anyone else's looked like this.

Terminator2

Looks like someone installed it to me.

09CobaltSS1

I just tried looking in alldata for you. There are bunches of good breakdowns and diagrams, but nothing that I can find giving a good example of how contact between the 2 is made. Google search the hpfp. There are a bunch of good picks of what the plunger looks like. It should hopefully give you a better idea. The concept of it isn't too much different than an old flat tappet style lifter.

LNFwagonSS

The ZZP upgraded fuel lobe cams are used cams that are just modified afaik. That's why there is an option for a core charge on ZZP site. Or are you saying it looks as if it was used after the re grind?

Ok that makes sense. Will try trusty google for some pics

Terminator2

Looks like it but I am unsure how well they polish them after the regrind. They are not as smooth and shiney as I would expect.

LNFwagonSS

Yea I expected it to look and feel like the rest of the cam lobes. Do you, or anybody else have some measurements for the upgraded fuel lobe? I want to make sure it's within spec before and after I polish it.

09CobaltSS1

I don't know of many on here (including myself) that would really have some hard numbers for measurements. Honestly though, polishing the lobe will take off such a small amount off material that the overall throw of the plunger on the pump will not be effected. The idea isn't to so much remove metal, but to just level and polish the surface. VERY little material will be removed if done correctly.

LNFwagonSS

For sure, I agree. I just want to make sure it's within spec before doing any polishing though. If they were careless enough to neglect the finish (assuming it's supposed to be a smooth finish)who knows how accurate the re grind is...

Terminator2

I would think only ZZP has the specs on the regrind.

Zooomer

iTrader: (1)

The cams with larger fuel lobe only are regrinds from cores. The stage cams are new cams, never run.

LNFwagonSS

My appologies. I thought stg 1 was the upgraded fuel lobe only. I corrected the posts.

LNFwagonSS

Ok did some digging and found that there is a follower/valve lifter between the hpfp and cams fuel lobe. It does have a roller on the cam side so I guess the smoothness of the lobe is not as important as I thought it was. Part #532 is the valve lifter



And here's a close up

09CobaltSS1

532 is indeed a roller lifter and not flat tappet. I stand corrected on this one. :/

LNFwagonSS

In all fairness, the parts diagram doesn't show the roller part. The follower/valve lifter is still considered a tappet of sorts.

riceburner

iTrader: (66)

i got my stg2 cams from bluelightning. used and not for long either; they also had some decent grooves in them... we polished them down just a bit but really didn't worry about them. if the grooves were the other way is when some material would shave off we figured, and after changing the oil and having it come up clean as well as my magnetic drain plug seems that everything has been okay!

ps we used some trans fluid and a scotchbrite pad to clean up the surfaces is all, really didn't do much but just so ya know

LNFwagonSS

Interesting. I guess Im just used to seeing cams with smooth lobes.

Dyn0mitemat

iTrader: (3)

While not perfect, that doesn't look terrible. My stage cams weren't much cleaner. Id run it how it is

SSlobalt

LNFwagonSS

Ha, nice. That gives me a good perspective. The tappet roller is a little bigger than I imagined