Lifter height 1 mm decision

[Huw Powell]

> Hi actually i meant when there pumped up ...  hydraulic lifters have a 
> little chamber in wich oil goes in if someone looks closely  on the 
> underside theres a pin  if lifter has leaked for a long time you can 
> push it in that's how i knew which one i was going to take off the old 
> head the leaky ones where easy to push in. Anyways if both kind are 
> fully pumped up mc's and kh engine's will sit 1 mm higher touching valve 
> and if i measure from the botom contact area (area that should touch top 
> of valve spring) and top it is 1mm difference.
> Also the na's lifters top edge is square the turbo's its a little 
> rounded it's hard to notice.... also the  pin's contact surface is 
> slightly narrower on the turbo's.

Ok, so at least I wasn't telling you anything you didn't know.

It could still be that, "pumped up," the lifters in different engines 
end up in different places - perhaps due ot a more aggresive cam lobe on 
the turbo engine?

In the last call, though, I would say, why not replace all ten?  They're 
only about $6 each, and you've got the cam up out of the way to do the 
job...

It could also be that the visual differences you see are a change, 
perhaps even an improvement, in the lifter design.  So, again, why not 
go with ten new ones?

Best of luck, whichever way way you go/went.

PS, can anyone here hum "Men of Harlech?"

>>> Hi, i was going to change a few lifters on my mc engine and swap them 
>>> for a few good ones from 4000 2.2 l head anyways i removed cam etc 
>>> but when i compared the two lifters the seemed a little different so 
>>> i pulled out my micrometer to check the height it seems that the mc 
>>> engine's sits 1 mm higher then i checked for new ones but for both 
>>> engines it's the same part number.
>>
>>
>> This may be more of a question than an answer, but isn't the whole 
>> point of "hydraulic" lifters that they self adjust during use?  In 
>> other words, that "height" figure depends on the dynamic interaction 
>> between the cam lobes and valve stems (and valve springs...) and oil 
>> pressure.
>>
>> I suspect if you put them in and run them and then take them out and 
>> measure again, they'll all be the same height.
>>
>> But I may be terribly, terribly wrong...

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/