your truck was designed for a 145* 5 hole nozzle. not a 148* 7 hole. Its pretty much that simple, a 5 hole works better. I personally wouldnt mess with an injector smaller than a 5x12

 

I was informed that if i went to a thinner Washer under the injector it would be just fine and the spray pattern would still hit the Quench in the piston just right ..

 

the .020 washer place the nozzle closer to the bowl yes. however the spray pattern is still 7 holes instead of 5 and 145* vrs 148*. ive ran around several guys with 7 hole injectors and me personally i think they are excessivly smokey and run like hell. a good set of 5x12's set at 270 bar work better.

 

My understanding was that the SAC injectors would smoke less and not be as friendly on the power but be good and efficent and give a bit more volume burn cleaner that the 5 hole injectors ? maybe i miss read the article ?

SACorVCO

maybe I'm missing something ?

 

When it comes to two injectors with a comparable fuel delivery, one having 7 holes and
the other having 5 holes. The 7 hole injector should demonstrate better fuel atomiztion
because of the smaller hole size. This would account for the observation that the 7 hole
version results in quicker spooling, better low end throttle response, less smoke and lower
egt's. Blackskyracing did back to back dyno runs comparing 5x14 VCO injectors to 7x10
SAC injectors. Both made the same power but with the 7 hole injectors demonstrating the
other advantages listed above. 5x14 SAC injectors would have made more power, but
without them in the back to back dyno runs it is impossible to say how much more. 5x14
CSA is 0.0007697 and the 7x10 CSA is 0.0005498. That roughly makes the 5x14 a 200 HP
over stock injector and the 7x10 a 125 HP over stock injectors. SAC can give a smaller
injector 50 - 75 HP more over a VCO injector. So the 7x10 SAC now acts like a 7x12 VCO
injector (200 HP over stock) or a 5x14 VCO injector.

The conclusion is that for comparable 5 and 7 hole SAC injectors(7x10-5x14, 7x12-5x16,
7x14-5x18), the 5 hole version will make slighlty more power while the 7 hole version will
demonstrate the other advantages listed above. The 7 hole advantages likely come from
atomization, while the 5 hole advantages likely come from spray pattern considerations.

When it come to making a decision, it will come down to your goals. When the goal is
maximum power, the 5 hole version seems to be the better choice. While for a daily driver,
the 7 hole stands out as the better choice.


did I miss read the article ? or did the guys you run around with not have a well set pup injector(s) ??

 

buy what you want man. im just telling you what ive experienced. and 5x14's are advertised as 140hp injectors. you may be luck to see 100 if you have the air for them. a 7x10 are a shade larger than stock and a tiny bit smaller than a 5x12. and you want a SAC nozzle. but its whatever, build the truck into what you want.