Thread: 2 1/4 ltr diesel

yes, though its been a while since I had one apart weakening that spring will give more advance on the injection point from memory its a double spring with an inner and outer component to it.

Yes, that's the one. As Dave mentions it is a double spring. You can try removing the inner spring entirely, though some people have reported that doing that can make the engine detonate under acceleration.

Originally Posted by isuzurover

Yes, that's the one. As Dave mentions it is a double spring. You can try removing the inner spring entirely, though some people have reported that doing that can make the engine detonate under acceleration.

No... I ain't gonna try that. So all I have to do is remove that spring, get one the same length but of .8mm wire diameter, slip it in there and do it all up the way it was?

I won't need any special equipment?

Thanks for the help, men.

pretty much so long as the spring is the same length pitch etc etc....

putting a weaker spring in allows it to advance more earlier on in the rev range.

now the 30 cent questions.

1. Why does this make the engine run better and produce more power.

2. Whats the potential problems?

3. whats he worst part of the problem.

4. Why?

Originally Posted by Blknight.aus

pretty much so long as the spring is the same length pitch etc etc....

putting a weaker spring in allows it to advance more earlier on in the rev range.

now the 30 cent questions.

1. Why does this make the engine run better and produce more power.

2. Whats the potential problems?

3. whats he worst part of the problem.

4. Why?

From what I understand:

1. The softer spring allows for earlier delivery (and greater amounts) of fuel from the pump. This means more fuel is used to increase power i.e. a bigger bang

2. With a weaker spring there is more chance of the spring breaking or failing causing the timing to advance too early i.e. firing before TDC?

3. Complete failure and detonation, increased wear on parts.

4. Precombustion chambers being broken from the engine and catastrophic failure of the unit.

How'd I go?

Originally Posted by korg20000bc

From what I understand:

1. The softer spring allows for earlier delivery (and greater amounts) of fuel from the pump. This means more fuel is used to increase power i.e. a bigger bang

2. With a weaker spring there is more chance of the spring breaking or failing causing the timing to advance too early i.e. firing before TDC?

3. Complete failure and detonation, increased wear on parts.

4. Precombustion chambers being broken from the engine and catastrophic failure of the unit.

How'd I go?

close I'll give you 2/4...

Heres the same questions with some hints in the right direction.

1. Why does this make the engine run better and produce more power.

The engine runs better and makes more power because the injected fuel charge is ........ allowing .......


2. Whats the potential problems?

because the fuel charge is (part of the answer to question one) in the compression stroke the pressure (and temperature) of the combustion chamber ........ and the engine may experience ...... in extreme cases might .........

3. whats the worst part of the problem.

Making the adjustments takes advantage of the conservative settings of the fuel system. Doing so reduces.......

4. Why?
as the modifications would be done in a given environment a change to ......... or the quality of ............... could push some components past ................ causing..............



but a good first try.

1. Why does this make the engine run better and produce more power.

The engine runs better and makes more power because the injected fuel charge is increased allowing more torque


2. Whats the potential problems?

because the fuel charge is increased in the compression stroke the pressure (and temperature) of the combustion chamber increases and the engine may experience overheating in extreme cases might crap itself

3. whats the worst part of the problem.

Making the adjustments takes advantage of the conservative settings of the fuel system. Doing so reduces economy, engine/engine component life

4. Why?
as the modifications would be done in a given environment a change to performance or the quality of parts production could push some components past design specifications causing Failure

Thanks for helping me learn this stuff, teach.

Originally Posted by korg20000bc

1. Why does this make the engine run better and produce more power.

The engine runs better and makes more power because the injected fuel charge is increased Introduced earlier allowing more torque(its correct in reality but not in this context)


2. Whats the potential problems?

because the fuel charge introduced earlier in the compression stroke the pressure (and temperature) of the combustion chamber increases and the engine may experience overheating(again correct but not in this context) in extreme cases might crap itself(ok yes, but what specifically)

3. whats the worst part of the problem.

Making the adjustments takes advantage of the conservative settings of the fuel system. Doing so reduces economy, engine/engine component life

4. Why?
as the modifications would be done in a given environment a change to performanceThe environment (temperature and atmospheric pressure) or the quality of parts production(read as tolerance) or Fuelcould push some components past design specifications causing Failure(near enough)

Thanks for helping me learn this stuff, teach.

corrects in green wrong in red corrections and more hints in blue.

your getting there, what Im shooting for is to get you thinking about how the otto cycle works and what shifting the injection point (think of it as the spark timing, it helps) does and what the implications of that are.

Then we can go on and just mess with chucking more fuel in.