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Thread: Pdd 5x12s with k27 n no fuel plate? Reply to Thread
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  Topic Review (Newest First)
05-20-2019 11:06 PM
hemirunner426
Quote:
Originally Posted by GAmes View Post
Care to expand on that?
Tony explained it for me.

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05-20-2019 11:06 PM
hemirunner426
Quote:
Originally Posted by alanack6795 View Post
So running bigger injectors with a more conservative plate will yeild about the same power with less egts and smoke?
Potentially yes. It's about the injection window being optimal relative to the piston as it comes to TDC. Too small of injector may put the end of the injection window past TDC and there comes your heat and smoke and some other problems, as an example.

Remember the piston doesn't stop traveling in the bore when the injector opens, sprays, and closes.

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05-20-2019 10:34 PM
alanack6795
Quote:
Originally Posted by dauntless89 View Post
Relative to smaller nozzles, larger nozzles deliver a given amount of fuel in a shorter duration. While 300hp, maybe 350hp is attainable on stock 160hp injectors, they become enough of a bottleneck that "full rack" with 160hp injectors results in lots of fuel late in the combustion stroke leading to excessive smoke and high EGTs. A 5x12 at, say half rack travel (spitballing here) will make the same power but with much less smoke and lower EGTs. This effect lessens the larger the nozzles get.
So running bigger injectors with a more conservative plate will yeild about the same power with less egts and smoke?
05-20-2019 09:26 PM
dauntless89 Relative to smaller nozzles, larger nozzles deliver a given amount of fuel in a shorter duration. While 300hp, maybe 350hp is attainable on stock 160hp injectors, they become enough of a bottleneck that "full rack" with 160hp injectors results in lots of fuel late in the combustion stroke leading to excessive smoke and high EGTs. A 5x12 at, say half rack travel (spitballing here) will make the same power but with much less smoke and lower EGTs. This effect lessens the larger the nozzles get.
05-20-2019 06:03 PM
GAmes
Quote:
Originally Posted by hemirunner426 View Post
The 5x12s will get you a shorter injection window ......
Care to expand on that?
05-20-2019 05:37 PM
hemirunner426 The 5x12s will get you a shorter injection window but at that power level it is debatable on any real world affects.

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05-20-2019 04:42 PM
dauntless89 For a max of 350hp you could go with either 5x12s or stock 215s. I'd see what you can get the best price on.
05-20-2019 04:35 PM
alanack6795 I have a 160 pump and need new injectors. I would like somewere around 275-350 hp. Should i get 5x12s? Friend of mine said it will run cooler with more fuel at less rack travel; if that makes any sense.
05-17-2019 04:11 PM
GAmes That information has been posted dozens of times. A little time to do some research will save you hours while waiting for someone to answer your questions.
05-17-2019 03:28 PM
Dmaxdude Ok thanks!
05-17-2019 08:46 AM
GAmes
Quote:
Originally Posted by Dmaxdude View Post
Would a 4 inch exhaust lower egts considerably or is the stock exhaust straight piped fine?
No. The stock exhaust size will flow just fine to over 400 HP. When my stocker burned out the 4 inch MBRP didn't change my EGTs, at least not enough to read on the gauge.
05-16-2019 10:33 PM
Dmaxdude Would a 4 inch exhaust lower egts considerably or is the stock exhaust straight piped fine?
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