Puzzle Corner

Technical questions and answers concerning all models of VW diesel vehicles.

Moderator: Fatmobile

Quantum-man
Turbo Charger
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Joined: Mon Apr 24, 2006 4:34 pm
Location: Gloucester; Limey-Land

Puzzle Corner

Post by Quantum-man »

As we're in the mood for clever stuff :wink: ...
Every time I make a static timing measurement, the dynamic timing advances slightly! Why?:shock:
My pump is more advanced dynamically than most, because I've discovered something is missing from my pump. What? :twisted:
"I'm not here to help... I'm here to Pro-Volke"

Be like meeee...Drive a Quantum TD
...The best work-horse after the cart...

Quantae grow on you...but Rabbits are like roses...
... girls like em ;o)

Only one Darwin, Einstein, Poe and Verne.
That is why if you listen, you will learn:
From the one and only Quantum-man,
Who sees the worms from outside of the can.

7 Quantae in 20 years; 4 dead and 3 TD's still alive [2 wagons & 1 fastback] oh and a GTD :o)
Fatmobile
Global Moderator
Posts: 7566
Joined: Wed Oct 30, 2002 10:28 pm
Location: north central Iowa

Post by Fatmobile »

hmmm, every time he measures the static timing,
That's with a dial gauge right?
the dynamic timing advances slightly.
hmmmmm???


A missing shim could advance timing dynamically
'91 Golf gasser converted to a 12mm pump, M-TDI.
'84 1.6TD Rabbit with a VNT-15 turbo, still setup to run on vegetable oil.
'84 GTI with 1.7TD pistons and intercooled.
2003 TDI wagon
2000 TDI Jetta.
CoolAirVw
Turbo Charger
Posts: 791
Joined: Mon Oct 17, 2005 7:21 pm
Location: Kansas City area, Missouri

Post by CoolAirVw »

key between injection pump shaft and pully?
Richard
85 Jetta TD
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Quantum-man
Turbo Charger
Posts: 2085
Joined: Mon Apr 24, 2006 4:34 pm
Location: Gloucester; Limey-Land

Post by Quantum-man »

Yo ho h'mm.

Only 2 answers in 30 odd peeks
No-one yet with answer I seeks :lol:

This might help; A rule of thumb; :idea:
Never had the pump completely undone.
"I'm not here to help... I'm here to Pro-Volke"

Be like meeee...Drive a Quantum TD
...The best work-horse after the cart...

Quantae grow on you...but Rabbits are like roses...
... girls like em ;o)

Only one Darwin, Einstein, Poe and Verne.
That is why if you listen, you will learn:
From the one and only Quantum-man,
Who sees the worms from outside of the can.

7 Quantae in 20 years; 4 dead and 3 TD's still alive [2 wagons & 1 fastback] oh and a GTD :o)
rabbit_man
Turbo Charger
Posts: 274
Joined: Fri Mar 28, 2008 12:45 pm
Location: Alaska

Post by rabbit_man »

ARRRG!!! This is killin' me!

All I can think of is the timing advance spring is missing but that better not be, it would full advance all the time and wouldn't sound too good :shock: .

I probly won't sleep tonight. :roll:
Last edited by rabbit_man on Sat Dec 19, 2009 3:20 pm, edited 1 time in total.
Quantum-man
Turbo Charger
Posts: 2085
Joined: Mon Apr 24, 2006 4:34 pm
Location: Gloucester; Limey-Land

Post by Quantum-man »

rabbit_man wrote:ARRRG!!! This is killin' me!

All I can think of is the timing advance spring but that better not be it full advance all the time wouldn't sound good :shock: .

I probly won't sleep tonight. :roll:
Sleepless in Alaska?
Probably too warm due to G.W'ing
Throw off some of your bearskins and sleep in your bare skin :lol:
"I'm not here to help... I'm here to Pro-Volke"

Be like meeee...Drive a Quantum TD
...The best work-horse after the cart...

Quantae grow on you...but Rabbits are like roses...
... girls like em ;o)

Only one Darwin, Einstein, Poe and Verne.
That is why if you listen, you will learn:
From the one and only Quantum-man,
Who sees the worms from outside of the can.

7 Quantae in 20 years; 4 dead and 3 TD's still alive [2 wagons & 1 fastback] oh and a GTD :o)
rabbit_man
Turbo Charger
Posts: 274
Joined: Fri Mar 28, 2008 12:45 pm
Location: Alaska

Post by rabbit_man »

-45F this morning, doesn't sound like G W to me. :P I wish I had a bearskin. :(

More hints??? :D
Quantum-man
Turbo Charger
Posts: 2085
Joined: Mon Apr 24, 2006 4:34 pm
Location: Gloucester; Limey-Land

Post by Quantum-man »

rabbit_man wrote:-45F this morning, doesn't sound like G W to me. :P I wish I had a bearskin. :(

More hints??? :D
There's a clue in my recent rants;
All I have to say is; I was torquing about 'small potatoes' :lol:
"I'm not here to help... I'm here to Pro-Volke"

Be like meeee...Drive a Quantum TD
...The best work-horse after the cart...

Quantae grow on you...but Rabbits are like roses...
... girls like em ;o)

Only one Darwin, Einstein, Poe and Verne.
That is why if you listen, you will learn:
From the one and only Quantum-man,
Who sees the worms from outside of the can.

7 Quantae in 20 years; 4 dead and 3 TD's still alive [2 wagons & 1 fastback] oh and a GTD :o)
joat
Turbo Charger
Posts: 215
Joined: Sun Nov 11, 2007 7:28 pm
Location: Ottawa , Canada

Post by joat »

4 th pump mounting bolt under HI press end of pump ? tweaks the pump a bit and keeps things more in alignment ....
rabbit_man
Turbo Charger
Posts: 274
Joined: Fri Mar 28, 2008 12:45 pm
Location: Alaska

Post by rabbit_man »

HAH :idea: , I bet you don't have the cold start device on the back of the pump, instead you just have a cover!!!!!!

So the missing "cam" would give the timing piston more room and thus let it sit more towards the retarded position making it have more dynamic advance.

Please say I'm right!!! :)
Quantum-man
Turbo Charger
Posts: 2085
Joined: Mon Apr 24, 2006 4:34 pm
Location: Gloucester; Limey-Land

Post by Quantum-man »

Whilst I'm pleased with the few who've had a stab at my puzzle, the lack of other braincells is disappointing. :roll: Perhaps its the festive spirit.
I'll leave it a few more days before I give the answer.
To recap:
After I make each static timing measurement, my dynamic timing will advance slightly.
My pump is advanced dynamically more than most because I have discovered something missing from my pump.
I have not accessed internals as such.
You will all experience the same thing, if you do not take a simple precaution.
It is not detrimental to the car and may imperceptably [sp] improve things at higher speed.
"I'm not here to help... I'm here to Pro-Volke"

Be like meeee...Drive a Quantum TD
...The best work-horse after the cart...

Quantae grow on you...but Rabbits are like roses...
... girls like em ;o)

Only one Darwin, Einstein, Poe and Verne.
That is why if you listen, you will learn:
From the one and only Quantum-man,
Who sees the worms from outside of the can.

7 Quantae in 20 years; 4 dead and 3 TD's still alive [2 wagons & 1 fastback] oh and a GTD :o)
TylerDurden
Turbo Charger
Posts: 1285
Joined: Tue Dec 22, 2009 1:01 pm
Location: Michigami, USA

Post by TylerDurden »

A nooB takes a stab...

The stop-bracket is missing from the cold-start lever.
Have a nice day.


'91 Jetta ECOdiesel TD - clean & complete (less motor/tranny) for sale

'82 Westy Vanagon 1.9 N/A - 23.5mpg
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'94 Passat wagon VR6
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MizPahPAH
Diesel Freak
Posts: 174
Joined: Sun May 18, 2008 11:57 pm
Location: Mizpah South Jersey USA

Post by MizPahPAH »

Hey Mark

You are saying that you are only making a timing "measurement"

not actually making an adjustment?
Pete
Quantum-man
Turbo Charger
Posts: 2085
Joined: Mon Apr 24, 2006 4:34 pm
Location: Gloucester; Limey-Land

Post by Quantum-man »

MizPahPAH wrote:Hey Mark

You are saying that you are only making a timing "measurement"

not actually making an adjustment?
Yep :mrgreen:
"I'm not here to help... I'm here to Pro-Volke"

Be like meeee...Drive a Quantum TD
...The best work-horse after the cart...

Quantae grow on you...but Rabbits are like roses...
... girls like em ;o)

Only one Darwin, Einstein, Poe and Verne.
That is why if you listen, you will learn:
From the one and only Quantum-man,
Who sees the worms from outside of the can.

7 Quantae in 20 years; 4 dead and 3 TD's still alive [2 wagons & 1 fastback] oh and a GTD :o)
TonyB
Cetane Booster
Posts: 87
Joined: Thu Oct 22, 2009 9:19 pm
Location: Jacksonville, FL

Post by TonyB »

OK, let's think about this a little. When the injection pressure rises to the point where the injector "pops off" the fuel is injected into the cylinder. So for the dynamic timing of the pump to advance, the injection pressure would have to reach that point sooner in the cycle, therefore popping off the injector sooner.
If the washer under the timing access bolt on the back of the pump were missing, the volume of the chamber where the fuel is compressed by the piston would be reduced slightly. The injector pop-off pressure would be reached earlier in the piston's stroke, therefore advancing the dynamic timing slightly.

TonyB
Jacksonville, FL
81 Dasher 1.6na
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