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Thu Aug 10, 2006 4:46 pm

If the engines like metric, why are they stamped with american measurements....

Thu Aug 10, 2006 4:48 pm

DaveM wrote: According to my conversion program:

0.15mm = 0.005905494 inch
.006 inch = 0.1524 inch

0.10mm = 0.003936996 inch
.004 inch = 0.1016 inch

and as far as being a perfectionist, I would be more of a perfectionist holding true to the significant figure issue than to try and measure something to an illogical tolerance.

:?

Thu Aug 10, 2006 4:51 pm

Cocoabean wrote: If the engines like metric, why are they stamped with american measurements....

i'd really like to see where my engine is stamped with american measurements. can you please point out where they are stamped so i can go look?

Thu Aug 10, 2006 5:46 pm

hazetguy wrote: Cocoabean wrote: If the engines like metric, why are they stamped with american measurements....

i'd really like to see where my engine is stamped with american measurements. can you please point out where they are stamped so i can go look?

It's on a tag on the fan housing
it says ".004"

Thu Aug 10, 2006 5:55 pm

Cocoabean wrote: hazetguy wrote: Cocoabean wrote: If the engines like metric, why are they stamped with american measurements....

i'd really like to see where my engine is stamped with american measurements. can you please point out where they are stamped so i can go look?

It's on a tag on the fan housing
it says ".004"

ok. i was looking for a stamp in the case and didn't see anything.
but now i am looking for a tag. all i see is a sticker that looks like this:

is that what you are talking about?

Thu Aug 10, 2006 5:58 pm

No thats not what i was referring to at first, i cant remember where the actual stamping was, that tag should be on the fan housing, but the stamp is somewhere on the case, i saw it when i was adjusting my valves... shit, maybe i was dreaming.

Thu Aug 10, 2006 7:40 pm

Quote: From a 'significant figure' standpoint 0.010mm == .004" and .015mm == .006 ... if the feeler said .0060 or .0040 you would have a point to make but it doesn't. Plus, the 7 hundred thousandths or 1 ten thousandth difference in the .004" and .006" measurements are absolutely insignificant for this application.

what did they tell you was the purpose of longer valve clearance when you did your training, as a dealership line mechanic, for vw dealer? why is more clearance better than less?

Thu Aug 10, 2006 11:24 pm

bill may wrote:

what did they tell you was the purpose of longer valve clearance when you did your training, as a dealership line mechanic, for vw dealer? why is more clearance better than less?

Tighter valves f*** the engine more than loose ones because if exhaust cant get out, it gets really hot, I PRESUME.

A loose valve just doesnt close all the way or stays open longer and jacks the timing and performance. I think

Thu Aug 10, 2006 11:57 pm

Cocoabean wrote:
Tighter valves f*** the engine more than loose ones because if exhaust cant get out, it gets really hot, I PRESUME.

A loose valve just doesnt close all the way or stays open longer and jacks the timing and performance. I think

Um I thought that tight tappets would STOP the valves from closing fully. After all, when the rockers are removed the valves are all shut, the rockers push the valves open. This has the effect of allowing a very hot (still highly compressed) exhaust gas to flow past the not-quite-shut valve, which will hurt poor Valvey in short order. If the valve is fully shut during most of the expansion phase, the gas will have cooled a great deal before anything but the interior face of the valve has to see the exhaust gas.

Does this sound reasonable?

Cheers, A.

Fri Aug 11, 2006 12:01 am

Yea that does, I'm thinking backwards, good point

Fri Aug 11, 2006 6:10 am

pyrOman wrote: DaveM wrote: According to my conversion program:

0.15mm = 0.005905494 inch
.006 inch = 0.1524 inch

0.10mm = 0.003936996 inch
.004 inch = 0.1016 inch

and as far as being a perfectionist, I would be more of a perfectionist holding true to the significant figure issue than to try and measure something to an illogical tolerance.

:?

Now that's the funniest fuckin thing I've read in a long time! LMAO

Fri Aug 11, 2006 6:17 am

DaveM wrote: pyrOman wrote: DaveM wrote: According to my conversion program:

0.15mm = 0.005905494 inch
.006 inch = 0.1524 inch

0.10mm = 0.003936996 inch
.004 inch = 0.1016 inch

and as far as being a perfectionist, I would be more of a perfectionist holding true to the significant figure issue than to try and measure something to an illogical tolerance.

:?

Now that's the funniest fuckin thing I've read in a long time! LMAO

Nothing personal, I'm just sayin'... 8)

To paraphrase the current line going in the Rants now, I was like "WTH, Heller?" :lol:

Fri Aug 11, 2006 7:03 am

bill may wrote: Quote: From a 'significant figure' standpoint 0.010mm == .004" and .015mm == .006 ... if the feeler said .0060 or .0040 you would have a point to make but it doesn't. Plus, the 7 hundred thousandths or 1 ten thousandth difference in the .004" and .006" measurements are absolutely insignificant for this application.

what did they tell you was the purpose of longer valve clearance when you did your training, as a dealership line mechanic, for vw dealer? why is more clearance better than less?

I read/heard that VW specified 004 but so many people were frying their engines from defrayed maintainence that they reccomended 006. I set mine at 006...of, not that I defray my maintainence or anything, but I beleive in insurance.
--Dan

Fri Aug 11, 2006 7:25 am

I set mine at .006 also. In case anyone cares... The engine and pushrods expand as it heats up. As the engine expands the valve lash tightens up. If your valves are too tight, they stay open and burn a seat or valve.