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  #1001  
Old 05-29-2016, 09:15 AM
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So what makes you suspect problems with the pump?
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  #1002  
Old 05-29-2016, 10:47 AM
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We can't get the lope out of it and it doesn't free rev right. It's running fine under load but they want to look it over.
  #1003  
Old 05-29-2016, 11:32 AM
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Don't most big mechanical pumps lope until they're under full load? I thought that was just the nature of the beast. Pretty much every pulling truck lopes while spooling... but I will say they don't quite lope as much as your 7.3 does
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  #1004  
Old 05-29-2016, 11:47 AM
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Quote:
Originally Posted by WhiteMamba_Scorpion View Post
Don't most big mechanical pumps lope until they're under full load? I thought that was just the nature of the beast. Pretty much every pulling truck lopes while spooling... but I will say they don't quite lope as much as your 7.3 does
Yes to a point. There is a bumper screw on the back of this pump that dampens the governor arm and will make it idle better.
  #1005  
Old 05-29-2016, 03:52 PM
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Ahh ok. Either way its gonna be gnarly once it's dialed in.
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  #1006  
Old 05-29-2016, 04:17 PM
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Quote:
Originally Posted by Cutting-Edge Diesel View Post
We can't get the lope out of it and it doesn't free rev right. It's running fine under load but they want to look it over.
It's basically the same as thinking: electronic PID LOOP tuning.

The gain is too fast and the proportional is not dampening.

In the case of a mechanical pump it will be in the flyweights. Probably too light or the flyweight a are simply stuck one or the other.
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  #1007  
Old 05-29-2016, 04:26 PM
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Quote:
Originally Posted by WhiteMamba_Scorpion View Post
Don't most big mechanical pumps lope until they're under full load? I thought that was just the nature of the beast. Pretty much every pulling truck lopes while spooling... but I will say they don't quite lope as much as your 7.3 does
That's largely to do because the injector is so big in conjuction to the lack of a BIG timing advance assembly it's next to impossible to control the idle. It's basically fuel on fuel off repeatedly.. the lope. It can be brought under control but not easily. Much easier you control at higher rpm when the weights in the governor have some momentum behind them.

That's going to be the trick to getting this yellow wagon to idle somewhat under control is the perfect balance for weights on the AFr. Too light and they respond like uncontrollably. Too heavy and spool up becomes an issue and he will have a drowning affect once he leaves the line and it shifts one time.

If you will notice a 14liter+ engine does not have the problem of loping and spooling like a "small engine" does. And that's because they have a AFR weight assembly as big as a quart size paint can lid.
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  #1008  
Old 05-30-2016, 05:41 PM
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Quote:
Originally Posted by CATDiezel View Post
That's largely to do because the injector is so big in conjuction to the lack of a BIG timing advance assembly it's next to impossible to control the idle. It's basically fuel on fuel off repeatedly.. the lope. It can be brought under control but not easily. Much easier you control at higher rpm when the weights in the governor have some momentum behind them.

That's going to be the trick to getting this yellow wagon to idle somewhat under control is the perfect balance for weights on the AFr. Too light and they respond like uncontrollably. Too heavy and spool up becomes an issue and he will have a drowning affect once he leaves the line and it shifts one time.

If you will notice a 14liter+ engine does not have the problem of loping and spooling like a "small engine" does. And that's because they have a AFR weight assembly as big as a quart size paint can lid.
Small correction on my own wording. When dealing with the AFR it works in conjunction with the timing advance unit with is dynamic on large engines... more so than small engines. The TA is the more proportionated weights, where a small engine struggles in this area.
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  #1009  
Old 06-14-2016, 07:45 PM
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Last time you will see it yellow









  #1010  
Old 06-14-2016, 09:24 PM
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What have you decide on color wise?


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