some questions about the DB-2 timing advance solinoid.

[m1garand_man]

What does the timing advance solenoid actually do? It looks like the plunger actually connects or contacts anything in the lower part of the fuel pump. If I'm right it looks like when the solenoid is energized the plunger pushes up and either opens up the check valve on the fuel return connector or it blocks the fuel flow out of the pump all together. But I'm not sure which much less why and what that does to advance the timing. Could someone explain this to me?

 

[gusto1]

what is a DB-2?

 

[Oldsouthernboy]

What you are looking at is not a timing advance but a cold start selonid that at below 85 degress advances the throttle to warm up faster. just idles the engine a little faster.

 

[ODdave]

The timing advance is the arm on the side of the pump......

 

[m1garand_man]

What you are looking at is not a timing advance but a cold start selonid that at below 85 degress advances the throttle to warm up faster. just idles the engine a little faster.

no thats not what I'm looking at. what I'm looking at is inside the standyne DB-2 injection pump under the pump cover.

I'm talkingabout part 14 on part 13 in the diagram. All is seems to do is block off the return connector and I'm not sure how that advances the timing.

 

[Matt65]

no thats not what I'm looking at. what I'm looking at is inside the standyne DB-2 injection pump under the pump cover.

I'm talkingabout part 14 on part 13 in the diagram. All is seems to do is block off the return connector and I'm not sure how that advances the timing.

I am no DB2 expert, but there is a lot of very good information in the links below. I believe what you are asking about is the High Pressure Cold Advance (HPCA).

Oliver Diesel - Engines & Outdoors

Stanadyne DB2 Fuel Injection Pump &raquo Motor Mayhem


"Housing pressure and transfer pump pressure behind the power piston influence the action of the servo piston. When the engine is cranking, the fuel behind the servo piston is at housing pressure, and the power piston is seated against the housing. As the engine speed increases, transfer pressure rises and the subsequent increase in transfer pump pressure forces fuel into a chamber behind the power piston.

When transfer pressure in chamber behind the power piston exceeds housing pressure, the servo piston acts against the servo spring, and the power piston pushes the cam advance pin which rotates the cam ring in the opposite direction to the distributor rotor’s rotation and so the rollers contact the cam lobes earlier and injection timing is advanced." -Neil Beadle

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