How did this not wipe the lobe? - Chevelle Tech
Engine General Engine Discussion.

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post #1 of 10 (permalink) Old Jun 28th, 20, 1:47 PM Thread Starter
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Russ
 
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How did this not wipe the lobe?

Someone clearly wasn't trying very hard when they made this lifter 😅

Also, how is it possible to not notice something like this during install??

This is from my 355. It's marked "cc-812", so I'm guessing it's the Comp 812.. I pulled the lifters because one had gone soft - I started getting a ticking sound, and was able to push one rocker down by hand (with a fairly hard push). That one still looks fairly good externally, aside from a little crusted on crud.

This lifter is from the next cylinder over, where I didn't have any problems. It's badly pitted on the face (you know, the most important part of the whole lifter), clearly from the factory. There's no way this pattern was created by the cam.

My question is, how did this not wipe the lobe? Is it because the cam just floated over the pitted area without grinding?

More importantly, what are the chances that the lobe won't wipe shortly after installing new lifters? I'm really hoping to not have to pull the motor out just yet.

Also - any recommendations on what to replace it with? This motor has a "big" cam, although I still don't know which one. It doesn't rev all that high due to low flowing heads, so maybe the cheap Summit ones would work for now?
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post #2 of 10 (permalink) Old Jun 28th, 20, 3:10 PM
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Marcus
 
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Re: How did this not wipe the lobe?

Crower cam saver lifters or howards direct lube but both are more expensive than the summit.

Have you removed the cam? You are sure the lobe is ok? Did you check the lift or how did you verified it was ok?

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post #3 of 10 (permalink) Old Jun 28th, 20, 4:12 PM
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jeff
 
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Re: How did this not wipe the lobe?

Looks to me like the lifter sat on the lobe of the cam when moisture was present.
Sat long enough to allow the moisture to make rust pitted lifter.

I did some testing with different oils and rest preventatives for rifles and found out just how well Mobil synthetic does NOT work and how well Transmission fluid does not work when the metal is exposed to moisture.

Now for stuff that does sit for a long time before being used Gibbs has an oil that combats rust.

Not knowing if your engine sat for long periods between starts or if high moisture content was in the oil .. but looks like that could be the issue.
Malibu ss 64 mentioned good lifters .I have never had any issues with the Hydraulic Crower Cam savers.
I have them in my 57 chevy and it is all I have ran for over a decade for the flat tappet hydraulic lifter for my BBC and SBC engines.
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post #4 of 10 (permalink) Old Jun 28th, 20, 8:51 PM
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Mr Bill
 
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Re: How did this not wipe the lobe?

Russ,
Is this a new engine or one with a lot of hours on it ? I tend to agree with Jeff by looking at the pitted spot. I dont think that was there when the lifter was new.

Lifters dont "go" soft. The noisy one probably has some crud in it keeping it from working properly. I have never had an issue with Comps 812 lifters, no reason not to use them again.
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post #5 of 10 (permalink) Old Jun 28th, 20, 9:30 PM
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Re: How did this not wipe the lobe?

Most of the cams I have lost over the years were comp cams. The reason? who knows. Last year I used the Summit 1302 BBC cam and their lifters, worked great. What I did was use some real weak breaking springs and then change them after 30 minutes of break-in time.
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post #6 of 10 (permalink) Old Jun 28th, 20, 10:52 PM Thread Starter
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Russ
 
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Hmm.. the bad spot really is shaped like the end of a lobe, isn't it? I managed to get some pics of the cam, and it does look like it's badly pitted as well. So.. I was wrong!

The motor is fairly new to me - came with the car two years ago, but I've put hardly any miles on it since then (less than 100 probably).

Something involving water definitely happened to it before I got it, because there appeared to be water in the oil, which never came back after I changed it. The oil cap was missing, so I always suspected the motor sat out in the rain before being dropped in, and that's where the water came from. Looking at it again, I am seeing what looks like rust on top of that head, down some of the pushrod holes, and down into the block.

Now I'm wondering what else might be damaged? Maybe my "future" motor upgrade will have to happen sooner than I planned?
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post #7 of 10 (permalink) Old Jun 29th, 20, 1:21 AM
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jeff
 
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Re: How did this not wipe the lobe?

That looks to be done for.
At least you found it before it ruined everything.
Yes a rebuild is in order but you are not 200 miles from home when it would could have failed on you.
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post #8 of 10 (permalink) Old Jul 3rd, 20, 6:58 AM
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Tyler
 
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Either way why would you put a new lifter on an old flat tappet cam?!? With what I’ve been through the past couple months with cams, I’d be pulling it apart before it tears up the rest of the motor!!!
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post #9 of 10 (permalink) Old Jul 3rd, 20, 8:23 AM
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Re: How did this not wipe the lobe?

Looks like a lot of rust on the block above the lifter bore
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post #10 of 10 (permalink) Old Jul 4th, 20, 12:54 PM Thread Starter
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Russ
 
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Looks like it did trash everything.. it just wasn't far enough progressed that it was really noticeable.

I think it would be kinda fun to rebuild it myself and turn it into a 383, but comparing costs (and considering the lack of air conditioning in my garage), I will probably just get a crate motor. I could always go back and rebuild it when the weather gets cooler.

ATK, Smeding and Blueprint all have a good selection of motors at decent prices. Mark Jones also shows a 467 on his website that looks quite affordable.. if that price is still close to accurate, that one might be a great pick.
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