13mm vs bigger injectors

C

Cummins12v

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Nov 22, 2007
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im bored and want more power. Should i step up my injectors to a set of 5x22s or should i stay with 5x18s and do 13mm plungers. my 12mm pump i have now is a 911 maxed out.
 
You want the added injection rate of the 13mm pump. Made a big difference in my trucks ability to light turbos easier.

What is the truck going to be? Hot street toy or...?


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I believe Ferrel diesel service once posted saying a 12mm with a big cam was faster than a 13mm with a stock cam. Could be wrong though
 
YOUNG GUNS15 said:
You want the added injection rate of the 13mm pump. Made a big difference in my trucks ability to light turbos easier.

What is the truck going to be? Hot street toy or...?


Sent from my iPhone using Tapatalk
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Just a toy to rip around. Thanks for the advice. Who do you recommend? Darren Morrison did the pump I have now
 
mfsuper90 said:
I believe Ferrel diesel service once posted saying a 12mm with a big cam was faster than a 13mm with a stock cam. Could be wrong though
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Below 400cc a 12mm b&p and v2.75 cam is faster than a 13mm b&p and 903 cam.

Above 400cc the 13mm and 903 cam is faster. At 600cc it is a lot faster.
 
CTDYoungGun said:
Below 400cc a 12mm b&p and v2.75 cam is faster than a 13mm b&p and 903 cam.

Above 400cc the 13mm and 903 cam is faster. At 600cc it is a lot faster.
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Thanks for clearing that up! I have never heard that before, but that’s great information to know :thankyou2:
 
i just had Seth build a 12mm with a 2.75. wonderful street pump, not a maximum effort kinda pump but loads better than your average 160.
 
Theredbeast said:
Is there any reason to upgrade a cam in a 180 pump?
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No, a 180 b&p doesn't lend itself well to quick rate cams- wrong LPC.

jlbayes said:
This answers your question. Can you justify having the cam replaced is the real question.
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I should have said "certain" 12mm b&p with the v2.75 are faster- I won't say which one(s) because a lot of pump shops are too lazy to figure it out for themselves (so we'll continue having a leg up).
 
CTDYoungGun said:
No, a 180 b&p doesn't lend itself well to quick rate cams- wrong LPC.



I should have said "certain" 12mm b&p with the v2.75 are faster- I won't say which one(s) because a lot of pump shops are too lazy to figure it out for themselves (so we'll continue having a leg up).
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I was reading a bit between the lines.
 
So what I'm gathering here, in the P pump world, a 160/2.75 pump is pretty much the best thing there is for a sub 400cc street/towing truck?
 
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