Bigger fuel injector nozzle design

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
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Phoenix Az
So i remember reading a few years back when i was first building my motor about nozzle design and how it may or may not have played a roll in making power as well as a better burn depending on angle, size, hole count, ect.

Well with me gearing up to get ready to swap my top end to an LLY, its got me back thinking about this and what new info there may be on nozzles.

Right now, im after fuel mileage. i will be rechecking my piston protrusion and adjusting headgasket thickness to tighten up my quench best i can without changing pistons out to help bring mileage up as well. But anyhow, the tips i have on my LB7 injectors are DDP 45% over competition tips that were done back in late 2010, early 2011. I have no idea how these were deigned or if their design is hurting me mileage wise. on the LLY injectors, i will be going back to 45% overs again but id like to know what (if any) tips wont go against mileage.

45% overs are small potatoes anymore compared to what some of these big HP trucks are running now but im looking to fine tune the setup in now since ill have things apart so im not taking it very lightly :D
 

S Phinney

Active member
Aug 15, 2008
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From what I know there us only two designed nozzles for a lb7. Stock VOC design and Motorsport SAC nozzle design. Motorsport nozzles have a 3 degree dual plain spray pattern. Plus have one more hole, 8 vs 7 on stock nozzles. All later generations are SAC nozzle design. I personally beleive that us one of the biggest reasons later design injectors last much longer than lb7 injectors do.

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S Phinney

Active member
Aug 15, 2008
4,008
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Quncy, Fl
Later injector design have avaliable Motorsport nozzles as well. The will change spray angle from 2 to 3 degrees closer than stock and add from 1 to 2 more holes as well. Possibility for better mileage can be had with this change. You can't guarantee mileage increases because of the end user but it does happen more than not.

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skintback

Take this one to church
Mar 5, 2007
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Plus the 8 hole motorsports nozzle out of the box are going to be 50% larger than a stock 7 hole (LLY) nozzle. But exergy will not sale you a set of motorsports nozzles by themselves they still want to install and flow them on your injector body's
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
21,670
5,817
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Phoenix Az
Plus the 8 hole motorsports nozzle out of the box are going to be 50% larger than a stock 7 hole (LLY) nozzle. But exergy will not sale you a set of motorsports nozzles by themselves they still want to install and flow them on your injector body's

oh did not know this. good to know!