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Injector Spray Pattern (Highflowed)

Torques

By Torques,
in Engines & Forced Induction

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Torques Mentor

Torques

Posted
Posted

Hello,

I was wondering if High Flowed injectors are always the pintle type?

(so just one hole?)

Also my standard injectors are 4 hole design, would anybody know if they just spray straight, or is there a pattern involved?

The background is:

I came about this seller, and at at least he's honest with his description and offers a return.

Injectors

I asked him via EMail what type of design the injectors are, and he said it is a two hole.

He also mentioned that other vendors have just a one hole design, and his design is superior. (V-Pattern)

By looking at the spray pattern in his ad, I'm under the impression that the stream of fuel is not very much atomized/dispersed.

Is this a misconception?

Thanks for your input :)

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https://www.sau.com.au/forums/topic/389925-injector-spray-pattern-highflowed/
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ARTZ Grand Master

ARTZ

Posted
Posted

they are disc type, from what I can figure they just drill out the 4 small holes into 1 big hole. Infact i beleive even the ID injectors just do this with a bosch base.. but it seems newer injectors tend not to lose their spray pattern when doing it unlike the older style..maybe there is more to it I dunno :unsure:

So I would think he is just leaving a bar down the middle when he drills them to split the spray..toyota JZ style sidefeed injectors are a twin hole injector, the theory behind it is that it sprays a seperate stream to each valve..How well this works in an RB I dont know..But I wouldnt expect miracles..

I thought you were going for topfeed anyway?

Torques Mentor

Torques

Posted
  • Author
Posted

Hi there,

Thanks for the input.

Yes, the plan is to go top feed.

However I wanted some side feed injectors as a 'backup' should something go wrong with the installation of the

Bosch injectors. (I want to avoid a long downtime, so PLAN B is to mount the sidefeed)

How's your installation going? Did you already run the car?

they are disc type, from what I can figure they just drill out the 4 small holes into 1 big hole. Infact i beleive even the ID injectors just do this with a bosch base.. but it seems newer injectors tend not to lose their spray pattern when doing it unlike the older style..maybe there is more to it I dunno :unsure:

So I would think he is just leaving a bar down the middle when he drills them to split the spray..toyota JZ style sidefeed injectors are a twin hole injector, the theory behind it is that it sprays a seperate stream to each valve..How well this works in an RB I dont know..But I wouldnt expect miracles..

I thought you were going for topfeed anyway?

greensa14 Collaborator

greensa14

Posted
Posted

If you are after highflowed jobs....i would go to "PJ's Quickbits" I can only vouch for him, but i have been running highflowed injectors he did for me for some time and have got very good results.

Will def go to him again when i go to E85.

dori34 Grand Master

dori34

Posted
Posted

If you are after highflowed jobs....i would go to "PJ's Quickbits" I can only vouch for him, but i have been running highflowed injectors he did for me for some time and have got very good results.

Will def go to him again when i go to E85.

+1 for PJ's hiflow service.

my rb25 neo injectors were flowed to:

600cc @ 43psi

850cc @ 60psi

MrStabby Grand Master

MrStabby

Posted
Posted

Multi hole injectors were intended for each jet from the holes to be aimed at a common point in front of the injector so that they crash into each other and assist with atomisation.

I thought dual hole injectors were intended for dual intake valve heads. Some designs spray the fuel onto the back of each valve head, using the heat of the valve to help fuel atomisation.

GTSBoy Grand Master

GTSBoy

Posted
Posted

I thought dual hole injectors were intended for dual intake valve heads. Some designs spray the fuel onto the back of each valve head, using the heat of the valve to help fuel atomisation.

It seems that there's no hard and fast rules about how the number of holes relates to the spray pattern. I looked here http://www.witchhunter.com/spraypattern1.php4 and found only the 4 hole type shown doing what I said.

Torques Mentor

Torques

Posted
  • Author
Posted

Yes, that is my understanding as well.

They spray on the backside of the intake vale, just before it is about to open.

I thought dual hole injectors were intended for dual intake valve heads. Some designs spray the fuel onto the back of each valve head, using the heat of the valve to help fuel atomisation.

Torques Mentor

Torques

Posted
  • Author
Posted (edited)

But the Bosch EV14 which came with my kit (at the time) are 6 hole (see my pictures)

I also wonder how much impact the injector spray pattern has, since it is always sprayed against the back-side of the intake valve.

Clearly buying side feed and 'dropping' them in produces less mounting downtime. :)

http://www.skylinesaustralia.com/forums/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=376533

I was this close to buying a set of those also. then after a bit more research i came to the conlusion to buy some nismo 550's, being proper quad orofice style -> better atomisation -> better bang -> heavier wallet. :cheers:

Edited by Torques

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