[Mgs] tappet question

[Richard Ewald]

Why would they be?  The lobes for #1 and #4 should be 180 degrees apart as
should the lobes for #2  and #3.
If they weren't you would have a very odd sounding and rough idle.
If you have ever listened to a air cooled VW motor, the source of their
funny sounding idle is they fire one cylinder (#3) a bit retarded so it
runs just a bit cooler as the oil cooler is right on top of the #3 cylinder.
But like I said, feel free to pull your valve cover and verify what I
said.  This is the internet, for all you know, I am an 16 year old red head
stringing you along.
Rick

On Mon, May 18, 2015 at 9:00 PM, Clayton Kirkwood via Mgs <
mgs at autox.team.net> wrote:

> Thanks but it was the best word that came to mind at the time. I think you
> understand what I was after. So, several degrees either side won’t matter
> is what you’re saying. I was fairly certain that was true, however, aren’t
> the lobes of intake on 1 and out on 8 slightly shifted on the cam?
>
>
>
> TIA,
>
>
>
> Clayton
>
>
>
> *From:* Richard Ewald [mailto:richard.ewald at gmail.com]
> *Sent:* Monday, May 18, 2015 8:37 PM
> *To:* crk at godblessthe.us
> *Cc:* <mgacars at yahoogroups.com>; <mgs at autox.team.net>
> *Subject:* Re: [Mgs] tappet question
>
>
>
> Houston we have a problem with terminology here.
>
> TDC and BDC refer to the position of the piston in the bore, or in the
> firing stroke. Period.
>
> Piston at the exact top of its stroke?  The piston is at TDC. At the exact
> bottom of its stroke? BDC.
>
> #1 at the top of its stroke on compression?  The engine is at TDC.
>
> What you are referring to is the valve being on the lobe or the heel of
> the cam.
>
> If you doubt that when #s valves 1 & 3 are on the top of the lobe that
> valves 6 & 8 are fully on the heel feel free to rotate the engine several
> degrees one way or the other and see if the gap gets bigger (it won't)
>
> This is because a camshaft is a circle (base circle) with a bump on one
> side. Anywhere on the heel is going to give you the same clearance.
>
> There are even some engines that instruct you to put the engine @ TDC #1
> adjust half the valves then rotate the engine 360 degrees and then adjust
> the other half.
>
> Rick
>
>
>
> Sent from my iPhone
>
>
> On May 18, 2015, at 10:03, Clayton Kirkwood via Mgs <mgs at autox.team.net>
> wrote:
>
> Regarding Rule of Nine, I understand having 8 all the way up to set 1. But
> there is a significant rotation between “real close to the top” in front
> of, and after TDC. This can be seen with rotation the engine and seeing
> very little to no movement. Also, if I am not mistaken 8 TDC is not
> perfectly in line with BDC of 1; there is a bias. This means that when 8 is
> TDC, 1 is not absolutely BDC ready for measurement. So the question is, how
> do you ensure, with all of that slop, that you truly have BDC?
>
>
>
> TIA,
>
>
>
> Clayton
>
>
>
>
>
>
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>
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