brndck

if they won't cover their work and their failures, absolutely put em on blast.

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jedi03

just don't do it if you think will be pursuing legally as the "slander" could come back and cause issues...

Kingtal0n

I hate to mention this but
if any of that shaving materials got into the block, oil passages and so forth, it could be useless to try and rebuild it. One little bit of metal lodges into a bearing and you have the beginning of a 10k max miles engine with destined bearing failure in 1-3 years.

Not saying its impossible to clean up, but it kind of is for some engines.
Failures because of using blocks with metal grit floating around is a thing.

This is why I don't put big money (as a college student) into an engine. If I was going to rebuild an SR20 at this point I would try to find a tired old engine that still ran (with say 120psi) and perform a stock rebuild in my own place.

Never let a machine shop or anyone for that matter touch an engine in a way that you can't personally measure/inspect, and you will never be disappointed in the rebuild, because even if you screw it up you will learn something. Whereas letting a machine shop screw you over teaches you nothing except to avoid machine shops. Which you have not learned yet. So I suppose thats fine for now. Did you learn yet?
Come back in a couple years and tell us what you've learned about rebuilding sr20 engines.

brndck

ultrasonic cleaning is rad.

pulling the balls out of the crank to clean the internal passageways is a damn good idea too

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RalliartRsX

Yep. Not sure which machine shop King is using, but my machine spot is able to get just about every single miniscule of oil shavings from any foreign object debris

Also, they removed the balls on my crank and tapped them with an NPT fitting in order for them to easily be removed if I ever had to do a tear down again.

Easy peasy. Short block is 100% salvageable. It just needs a complete tear down, inspection, new bearings, proper clearances measured and go. Easy several hundred bucks and a 1-2 week worth of tear, cleaning, etc

I can tear down a SR block in less than 3 hours on a slow Sunday lol!

kyral

this is not true. ive actually thrown a camshaft on to a concrete floor and it did not shatter

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Turbosauce74

Yup, I'll agree that on average they do shatter, but they can bend. In reality the bend is probably a fracture tho.

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brndck

a prince Rupert's drop is hard as fuck, you can smack it with a hammer, till you barely flick the tail and the whole thing shatters.

[YT]/https://www.youtube.com/watch?v=6V2eCFsDkK0[YT]

cams are hardened and brittle.

can anyone show an example of a cam set up in a lathe or v-block showing excessive runout (bending)?

i'm genuinely curious to see an example.

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Turbosauce74

I could put it in the head and it won't spin, swap cams and it spins. I don't have any machinist tool to show run out unfortunately. It's on the list.

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TheRealSy90

Roll the cam down the driveway on video, pretty easy to see its bent.

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jedi03

have seen in the past, pretty sure it can bend from the high heat and tolerances changing somewhere causing it to warp...but they do shatter super easy...I normally rotate them from the sprocket to spin them out and break the oil tension/suction from it, had one snap in half when doing so...

Kingtal0n

I've heard from a friend that you can snap a cam in half, over your leg


I tried it once and it left a bruise. why do nissan people give me bad ideas



they definitely flex and bend a bit as you install them using FSM procedure.
A brittle materials can display a wide range of properties, and so can ductile. Some ductile materials will display a brittle failure when the conditions are right for it to happen, such as when the force is applied suddenly. It has to do with the crystal continuity of covalent bond angles within the material.
There is no clear defined border between the two types of materials, but rather a range of conditions for which either behaves one way or the other.
Also, In engineering textbooks for example, there are many ways to define the yield strength and stress property of the same material.

jedi03

rofl at least wasn't like the can smash on the forehead! its amazing how things fail...I have a few small examples in my garage to help people understand what they may do depending on circumstances! failed rod, crushed ringland...super fun lol!

RalliartRsX

So OP.

Machine shop gonna take care of you or what?? Gonna let us in on who it is??