Vlv adjustment?

[JIPJOBXX]

Just wondering if vlvs are out of adjustment can this cause a car to run a little ruft?

[greg g]

noisey

[JIPJOBXX]

Greg you said noisy but what about running ruft??

[JIPJOBXX]

Guess that will be my next job on my old Dodge. Just finished with that other major headack and now I'm about to dive into another one.

[1955 plymouth]

I would guess if the valves were adjusted too tight it could hold the valves open and cause a loss of compression. That would cause the car to run rough. Might you have a compression tester?

[Dodgeb4ya]

Ruft?

[Jim Saraceno]

I would think that if the valves were the problem it would have shown up during your compression or vacuum tests.

I remember that you mentioned the needle moving around a bit when you. Follow this link and it will go through many scenarios with the vacuum gauge.

http://www.secondchancegarage.com/public/186.cfm

That being said, if you have never checked your valve adjustment, you should.

[JIPJOBXX]

I have my vacuum gage hocked up to my milking machine adapter vlv and I don't think there would be any problem with that? Now when I timed my car using my timing light the car runs at ideal about 19 lbs but when I just give it a little gas the vacuum goes right up to 22-24 lbs. It seems to run it best at this timing location although the vacuum is a little bit low when idling. I checked out that site showing the vacuum gages and mine seems to be working just fine although I can still see a slight hesitation on the gage. Is there a reason for the vacuum being low at the 350 to 400 RPM range or i'm just not thinking right?

[Don Coatney]

I recommend you do a complete valve job including a five angle valve cut, new valve guides, and valve seats. And you may as well bore the block, install new pistons, rings, and bearings while you are in there. Once this is complete report back your new vacuum readings and if your engine still runs ruft. If it does you might want to clean your spark plugs, look for a vacuum leak, or adjust your timing per the book and see if that helps.

[suntennis]

If valves are set too tight, they will make little if any noise and will make the engine run uneven. Loose valve settings unless they are very loose like 0.040 inches beyond normal should not affect the operation of the engine other than to be noisy. Vacuum gages measure in millimeters of mercury like a barometer, not in psi.

[T120]

  suntennis said:

If valves are set too tight, they will make little if any noise and will make the engine run uneven. Loose valve settings unless they are very loose like 0.040 inches beyond normal should not affect the operation of the engine other than to be noisy. Vacuum gages measure in millimeters of mercury like a barometer, not in psi.

..Hmmm,millimeters of mercury..I suppose my cars,my tools and I are all showing showing our age..

[Big_John]

  suntennis said:

Vacuum gages measure in millimeters of mercury like a barometer, not in psi.

Vacuum gages measure in many different units, including PSI, but most older automotive applications use inches of mercury (in/hg) while newer cars will be spec'd in millmeters of mercury (mm/hg).

I think in this case he is refering to in/hg.

[Don Coatney]

  Big_John said:

Vacuum gages measure in many different units, including PSI, but most older automotive applications use inches of mercury (in/hg) while newer cars will be spec'd in millmeters of mercury (mm/hg).

I think in this case he is refering to in/hg.

I dont recall ever seeing a vacuum gauge that measures PSI. A compound gauge measures PSI until the pressure goes negative and then it measures inches of mercury or the metric equevlent such as this old ammonia refrigeration gauge I use for system pressure in my shop compressed air system.

[T120]

..Probably a typo on Jon's part,and he meant in/Hg

[Big_John]

  Don Coatney said:

I dont recall ever seeing a vacuum gauge that measures PSI. A compound gauge measures PSI until the pressure goes negative and then it measures inches of mercury or the metric equevlent such as this old ammonia refrigeration gauge I use for system pressure in my shop compressed air system.

You don't see a lot of them, but yes they do exist. Quite often digital gauges will have capability to change units, in/hg, mm/hg, psia etc.

Actually, that gauge you show is measuring high pressure in PSIG, but I'm nit picking.

[Big_John]

  Ralph D25cpe said:

..Probably a typo on Jon's part,and he meant in/Hg

No, and its John. The h is silent, like the p in swimming.

[Big_John]

  shel_bizzy_48 said:

Think he meant Jon (no n) who started the thread:)

Jon with no "n" would be Jo.

But I didn't see the OP was named Jon. I apologize for that over site.

I don't apologize for spelling John correctly though.

[Don Coatney]

  Big_John said:

Actually, that gauge you show is measuring high pressure in PSIG, but I'm nit picking.

You are correct in nit picking my posting as the gauge picture I posted is indicating PSIG. But it is a low side gauge for R-717. Lots of folks dont understand that atmospheric pressure always comes first. Now you wanna talk bars and not the drinking kind.

[Tony_Urwin]

I used to come to this site for help, cuz I'm such an incompetent mechanic. lately I check in cuz it's funnier than anything on TV.

I think retirement is making Don a little cranky. A few more years and he'll be sitting on the porch yelling at kids on bicycles.

[Big_John]

  Don Coatney said:

You are correct in nit picking my posting as the gauge picture I posted is indicating PSIG. But it is a low side gauge for R-717. Lots of folks dont understand that atmospheric pressure always comes first. Now you wanna talk bars and not the drinking kind.

I talk that stuff a little too much when I'm getting paid.... It tends to make me want to go to the drinking kind of bar.

[Don Coatney]

  Tony_Urwin said:

I used to come to this site for help, cuz I'm such an incompetent mechanic. lately I check in cuz it's funnier than anything on TV.

I think retirement is making Don a little cranky. A few more years and he'll be sitting on the porch yelling at kids on bicycles.

Tony;

You are 100% correct! TV has outlived it's self. What is a bicycle:confused: as I sit on my porch pondering what to next yell at the kids.

[Plymouthy Adams]

  Don Coatney said:

What is a bicycle:

another thing you can no longer ride at your age..

[Big_John]

  Don Coatney said:

Tony;

You are 100% correct! TV has outlived it's self. What is a bicycle:confused: as I sit on my porch pondering what to next yell at the kids.

[Don Coatney]

  Big_John said:

. It tends to make me want to go to the drinking kind of bar.

I sense that you already know this, but the atmosphere in a drinking kind of bar frequently equals an atmospheric bar in IQ count content.

This would make a great TV show.

[Tony_Urwin]

Tim was walking down the sidewalk one day when Don rode up on an incredible shiny new bicycle.

Tim was stunned by his friend's sweet ride and asked, "WOW! Where did you get such a nice bike?"

Don replied, "Well, yesterday I was walking home, minding my own business, when a beautiful woman rode up to me on this bike. She threw the bike to the ground, took off all her clothes and said, 'Take what you want!'"

Tim nodded approvingly, "Good choice. The clothes probably wouldn't have fit."