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Old 07-23-2017, 03:18 PM
mischief mischief is offline
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Default Are these cams to worn?

So I picked up a parts motor, popped the valve cover off, and found what appear to be s4 cams in it. The owner has no idea as he never got the motor running. They appear to have a bit of wear buy does this wear seam to excessive? Measuring the lobes with a micrometer they are all within .04mm of each other at their peak.
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Old 07-24-2017, 05:36 AM
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Yea, that ridge looks really nasty. If your rockers don't match up exactly where the first ones did on those cams, you'll grind things up and probably kill both the cam and rocker.

I'd run them for like a Lemons engine, but not an engine I gave a crap about.

BTW - FSM has a service limit for wear, you want to see what the height of that ridge is, but I'm pretty sure it's well over FSM limits.
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Old 07-24-2017, 02:12 PM
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Thanks for the opinion. I was kind of thinking that would be the consensus. Two of the rockers in this motor are pretty marred, assuming it still would be a great idea to use them with the already worn rockers either?
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Old 07-24-2017, 03:19 PM
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Honestly, those cams might not have more lift than stock at this point. You've got to divide adv. lift by the rocker ratio to get the additional cam lift. S4's probably have like... 1 mm more than stock? I forget what the rocker ratio is on an SR, but let's say 1.55. That's 0.6 mm more at the cam, and I'd say you probably have about that much wear or more.


What was the guy doing, running the cheapest O'Reiley $1/qt oil for 15k mi? haha


Although I have seen a few sets of JWT cams pop up looking like this, so maybe they're a little softer than Nissan OEM cams.
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Old 07-24-2017, 05:41 PM
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After calculating measurements the with rockers being 1.55 (which is accurate) they still have a lift of roughly 11.7 give or take a bit. Which is significantly more than stock. But yah. I have no idea what he was doing to wear them so bad. This is the worst rocker and the lobe contacting that rocker.
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Old 07-24-2017, 05:54 PM
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They're only surface hardened too, so they'll wear very quickly going forward.
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Old 07-24-2017, 10:09 PM
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Wow, didn't realize that kind of wear was possible!
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Old 07-25-2017, 09:20 AM
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Quote:
Originally Posted by Def View Post
I'd run them for like a Lemons engine, but not an engine I gave a crap about.
hey HEY! 99% of Lemons racers actually prefer racing out on track than shlepping underneath their car working in the paddock.


Throw them in the recycling bin. If you put them in a Lemons engine, I will axe kick you in the nuts.
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Old 07-25-2017, 06:28 PM
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Well I figured out what happened. I mean damn, someone just didn't give a hoot it seems. The engine has some decent parts (arp studs, tomei cam gears, worn jw s4s ext. But wow at this bottom end. The thing had fine compression on all 4 cylinders but it looks the bearings are done for sure. And the oil pickup was broke and just sitting in the oil pan....that explains a lot. I'll get my money out of this wreck but would you guys even try fixing the crank?
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Old 07-25-2017, 07:41 PM
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Everything is likely toast given the state of the came.

I was going to say, blocked oil squirters on the cans will do that over a long period... or a broken oil pickup...
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