Cylinder/Head mating surface issue

Mark

I just received a pair of new heads opened up for 94mm and no step.
Am I just drunk, or is that right side going to cause me grief with sealing the cylinders?

The other cylinder and head are fine, but this one isn't just visibly rough, but to the touch as well

I'm not bashing the vendor as they've been really good to deal with, and I'm waiting to hear back from them to see what to do next to resolve this. I just want to know what would cause that?

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turbobob · Posted: Fri Feb 14, 2014 7:20 pm Post subject:

Let them correct the problem before you hang them out to dry, but that's all wrong. It's got nothing to do with you being drunk Wink

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Mark · Posted: Fri Feb 14, 2014 7:27 pm Post subject:

I agree, mistakes happen and I am not laying blame or naming names. I have no reason to believe it was anything other than an honest slip up. Just wanted to make sure this was an actual issue, thanks.

75smith · Posted: Fri Feb 14, 2014 9:08 pm Post subject:

either they cut with a worn tool, or they tried taking too much at one time, too fast
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fastfil · Posted: Fri Feb 14, 2014 10:28 pm Post subject:

It's called chatter. Caused by non-rigid mounting of head or cutter, blunt tool, too sharp tool, too wide or deep a cut, lack of lubricant, bad chosen rpm for harmonics, worn spindle bearings......and probably a combination of more than one.

Just lap your jugs into your heads with a fine grinding paste until you get a nice shiny band.
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vugbug68 · Posted: Fri Feb 14, 2014 10:31 pm Post subject:

Send it back to them and they should clean it up, it will only take 5 minutes
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jason · Posted: Fri Feb 14, 2014 10:57 pm Post subject:

I can't believe they sent them like that. Must have been dark or the QC guy was gone.

AlteWagen · Troll Joined: February 23, 2007 Posts: 8501 Location: PNW

are those real Rev Master castings or the back door empi versions?
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Alstrup · Posted: Fri Feb 14, 2014 11:59 pm Post subject:

Mark · Posted: Sat Feb 15, 2014 12:51 am Post subject:

Lots of input here. Yeah, lapping would be ok for slight imperfections, and this is not one of those instances.
Like I said, no need to slag anyone. I'm sure the vendor will make good on this and it will get sorted. I only wanted to know what could have caused that in the first place. Go about your business, nothing else to see here Smile

Dale M. · Posted: Sat Feb 15, 2014 9:15 am Post subject:

Boolean · Posted: Sat Feb 15, 2014 2:27 pm Post subject:

I would not ever again have stuff machined by the moron who did that crap.
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Quokka42 · Posted: Sat Feb 15, 2014 4:35 pm Post subject:

Oh, come on! Easy to do - a few too many pints at lunch and need to get the job done before you can have a toilet break... Very Happy

I certainly wouldn't try to lap that out.
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turbobob · Posted: Sat Feb 15, 2014 6:10 pm Post subject:

It's easy to make a mistake and ruin parts you are machining, but it's hard to understand why that would not get caught prior to shipping it out.
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Quokka42 · Posted: Sat Feb 15, 2014 6:57 pm Post subject:

Do you know how bad your vision can get if you drink half a dozen pints of beer quickly?
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Mark · Posted: Sat Feb 15, 2014 8:00 pm Post subject:

Turns out that s#*! WILL buff out.

I decided to try lapping it, (why not, had the lapping compound handy) and it looks like that did the trick.

The vendor did offer to correct it or cover the machining cost to have it fixed locally, but I'm happy with how this turned out. Now about those beers...

croSSeduP · Posted: Sat Feb 15, 2014 8:51 pm Post subject:

SBD · Posted: Sat Feb 15, 2014 9:16 pm Post subject:

croSSeduP · Posted: Sat Feb 15, 2014 10:24 pm Post subject:

VWCOOL · Posted: Sun Feb 16, 2014 2:45 am Post subject:


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