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Who is right Doc or Forrest

Who is right in valve gap debate

  • Doc

    Votes: 23 92.0%
  • Forrest

    Votes: 2 8.0%

  • Total voters
    25
For the Spyder (and other similar overhead cam/valve applications) Doc is right.

For push rod or rocker arm applications, Forrest is right.

For rotary valve or reed valve applications, they are both wrong! :roflblack:
 
For the Spyder (and other similar overhead cam/valve applications) Doc is right.

For push rod or rocker arm applications, Forrest is right.

For rotary valve or reed valve applications, they are both wrong! :roflblack:
:roflblack:You always seem to get it, I've found great humor in this debate, thought I'd help stir the pot.:ohyea:

Thanks for your colorful participation:popcorn:

Jim:thumbup:
 
:roflblack:You always seem to get it, I've found great humor in this debate, thought I'd help stir the pot.:ohyea:

Thanks for your colorful participation:popcorn:

Jim:thumbup:

If you can't have fun with it.... Why bother! I still feel sorry for Forrest being $100 lighther. Doc should be ashamed of taking advantage. :lecturef_smilie: :D
 
Yes I voted... for whom??? that is my secret.

Just wonder why so many do not understand the wager and vote for DOC... Doc makes mistakes and this one is an error on his part.:roflblack:.. I shall not concede, until one proves to me without question that the valve sets tighter vs new on the seat due to wear. I do believe the law of physics will support me.
 
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Yes I voted... for whom??? that is my secret.

Just wonder why so many do not understand the wager and vote for DOC... Doc makes mistakes and this one is an error on his part... I shall not concede, until one proves to me without question that the valve sets tighter vs new on the seat due to wear. I do believe the law of physics will support me.

Oh Forrest! We love ya... but you got to concede to the facts. It's 2011, not 1960.

If teacher has a SpyderLovers account you could get 2 votes! :D

Oh, I see teacher has already voted. Never mind!
 
Oh Forrest! We love ya... but you got to concede to the facts. It's 2011, not 1960.

If teacher has a SpyderLovers account you could get 2 votes! :D

Oh, I see teacher has already voted. Never mind!

I guess the law of physics has changed... Well just maybe it will change again in 2012..

I still stand on my conviction.
 
I guess the law of physics has changed... Well just maybe it will change again in 2012..

I still stand on my conviction.
:agree:Even though I had to vote for Doc never give up the debate for if you concede then you will have to pay, even if you have to stomp your foot and yell in a foreign language.

Deny' Deny' Deny!!!:roflblack:

But beware I do believe Doc has connections underground hate to see you get Knee-Capped:lecturef_smilie:

Jim:thumbup:
 
You know, I don't want to stir up the pot any more than it already has been, but I do see both arguments. Technically the valve itself does not get tighter; the valve lash gets tighter due to wear in the seat and/or valve. The important thing to keep in mind is the result, which is loss of complete seal of the valve and eventual loss of power and valve/seat damage.

Scotty, I did just what you said and drew it out on a piece of paper and it made sense to me after that. The video that Lamont posted was great as well. So what is being accomplished by re-shimming the buckets is compensating for lost lash so that the valves can close completely and keep a good seal. This is why it is important to get them checked.

So really, it might sound like hair splitting here but the physical valve does not get tighter; it is the lash that does. However, I think that we accept the general term "valves are tight" as loss of lash due to wear in the valve seats.

Regardless of who thinks who won, I value the technical nature of this discussion. Very good stuff guys! :2thumbs:
 
I guess the law of physics has changed... Well just maybe it will change again in 2012..

I still stand on my conviction.

Design has changed, not physics. And you do stand convicted on this one.

Used to be the actuating points wore faster than the valve contact surface giving you an ever widening gap that you had to close up with adjustment.

They’ve gotten this wear factor down to just about Zero Forrest. But the valve seat contact area still wears at about the same rate as it did in the 60’s. It’s not much but it’s more than the virtual zero of the other components.

Valve seat wear decreases gap and at some point your valves won’t close anymore (very bad). So you have to increase the gap (which isn’t very much to start with) or you’ll be burning valves.

It is the law of physics that dictates all of this Forrest. We didn’t make it up.

Raptor has a point but it's really not in context. The standard reference point is not the valve seat or valve seal. No one has a spec. for adjustment at the valve seat. There must be 100% contact at the seal point of the valve and seat at closure. The adjustment, and meaningful reference, is always at the point of contact with the actuating mechanism.

And at this universally accepted reference point, our system gets tighter with wear requiring a smaller shim allowing more clearance and a wider gap.

Sorry Forrest. Maybe we can take up a collection to cover your losses but consult us first before you bet with Doc next time...
 
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