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VE pump timing advance

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Old Jun 28, 2008 | 09:07 AM
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VE pump timing advance

Yesterday I finished up a device that allows me to accurately measure injection pump timing advance on the bench. The test mule was an intercooled first gen "205" pump.

Anyway, the stock pump only allows 9 degrees advance at the crankshaft!

The maximum timing available from a VE is supposedly 24 degrees, But appears to be 34 degrees with a hack on the timing piston. For those who don't know those are numbers that the p7100, idle surge, sled puller crowd talk about.

No wonder we're advancing pumps to the head in search of top end.

Just thought you might like to know.
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Old Jun 28, 2008 | 11:01 AM
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Very interesting
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Old Jun 28, 2008 | 06:37 PM
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Originally Posted by stillsmokin
Yesterday I finished up a device that allows me to accurately measure injection pump timing advance on the bench. The test mule was an intercooled first gen "205" pump.

Anyway, the stock pump only allows 9 degrees advance at the crankshaft!

The maximum timing available from a VE is supposedly 24 degrees, But appears to be 34 degrees with a hack on the timing piston. For those who don't know those are numbers that the p7100, idle surge, sled puller crowd talk about.

No wonder we're advancing pumps to the head in search of top end.

Just thought you might like to know.

so you cut a bit off of the timming piston, like 2mm's?
and did you have to modify the case to let the conecting pin go farther or is there enough room,
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Old Jun 30, 2008 | 08:55 AM
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Originally Posted by daking
so you cut a bit off of the timming piston, like 2mm's?
and did you have to modify the case to let the conecting pin go farther or is there enough room,
there's enough room, did mine a few months ago. I also advanced the gear a tooth, but I think to get back to stock base timing I may have to advance another tooth.

I really should get an indicator setup, anyone know where I can get the adapter?
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Old Jun 30, 2008 | 05:50 PM
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http://www.dieselvw.com/VW-Diesel-Dial-Gauge.htm
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Old Jun 30, 2008 | 06:21 PM
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Originally Posted by stillsmokin
Yesterday I finished up a device that allows me to accurately measure injection pump timing advance on the bench. The test mule was an intercooled first gen "205" pump.

Anyway, the stock pump only allows 9 degrees advance at the crankshaft!

The maximum timing available from a VE is supposedly 24 degrees, But appears to be 34 degrees with a hack on the timing piston. For those who don't know those are numbers that the p7100, idle surge, sled puller crowd talk about.

No wonder we're advancing pumps to the head in search of top end.

Just thought you might like to know.

9* advance?

Is this the amount of mechanical advance in the pump?

im assuming that the 24* is the base timing + mechanical advance?
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Old Jun 30, 2008 | 10:44 PM
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Originally Posted by wannadiesel
thats just a regular timming guage
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Old Jul 1, 2008 | 08:12 AM
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Originally Posted by daking
thats just a regular timming guage
Yep thanks Dave thats exactly what I need, screws into the back of the pump so you know how much piston lift you have at #1 cylinder TDC.
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Old Jul 4, 2008 | 04:47 AM
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How do you use the timing tool?
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Old Jul 4, 2008 | 06:14 AM
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It screws into the port in the center of the distributor head. You measure plunger lift at TDC, that lift translates to timing.
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Old Jul 4, 2008 | 09:07 AM
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second best tool ever made for these trucks
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Old Jul 4, 2008 | 01:03 PM
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Does the pump have to be on truck to check?

What is stock reading ?

Do you adjust by rotating pump?
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Old Jul 4, 2008 | 03:54 PM
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Yes.

Depends on the year, the spec is on the data plate on the timing case.

Yes.
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Old Jul 4, 2008 | 04:23 PM
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Thanks

I will be rebuilding my pump soon and am trying to get all the info I can.
Bearkiller did a great job of organizing all the VE pump info.
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Old Jul 4, 2008 | 04:35 PM
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From: Magnolia, TX
Originally Posted by stillsmokin

Anyway, the stock pump only allows 9 degrees advance at the crankshaft!
This is quite interesting because 9 degrees is also the timing advance range that is coded into the ECM programming on the 24 valve engines.

Jim
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