2G Injectors: ball-style fuel injectors or pintle-style injectors

[SOURCE1064]

Not sure if this would be considered an Extreme Tuner Forum question so I'll post it here. I've been pondering the idea of changing my injectors again even thugh I have new set of 720cc pintle-style Denso injectors to a set of Bosch 750cc/min ball-style. I have heard that the ball-style are able to run at higher sustained duty cycles and have better atomizing characteristics than the regular pintle-style injectors but I don't see the well known dsm shops, Buschur, Road Race Engineering, and Turbotrix, selling them. Also the pintle-style injectors cost more money. If the ball-style are supposed to be far superior why would they and do they cost less money? Serious input please, not I think x is better just because.

Thanks,

 

[SOURCE1064]

TTT anyone?

 

[L2RTSiAWD]

Well I have 650ccball/disc style and I love them. They idle better then other cars I know with 660cc pintle style. I don't know about the duty cycle since I have no way of monitoring it or comparing it to pintle style but they ball/disc style just seem better in design.

 

[candela]

http://www.dsm-performance.com/catalog/ourinjectors.php
I have noticed in the past from switching from a 370cc pintle to a 390cc ball/disc, better idling and a little bit smoother topend.

http://www.dsm-performance.com/catalog/ourinjectors.php

 

[SOURCE1064]

I understand from the picture but it doesn't help much when they don't compare the same type injectors. 450's and 550's are very different. It's similar to comparing two unlike turbos. Of course the bigger one will flow better. I guess I'll hold on to the denso's and see how they do. Another GSX in my shot had 750 ball disc type so I might ask him if I can swap them into my car when it's up and running to see the difference.

 

[sleeper]

I asked a similar question.....

http://dsmtuners.com/forums/showthread.php?s=&threadid=30438

Hope that helps

 

[980VR41k]

Here's some info reguarding the pintle, ball and disk types.


Taken from http://importnut.net/ignitionfuel.htm originally posted on http://www.automotiveforums.com/

Fuel Injectors
There are two common types of fuel injectors, pintle and disc (Lucas style). Pintle injectors have a superior spray pattern to disc actuated injectors, but disc injectors are less expensive and generally flow large amounts of fuel easily. If possible, always choose high flow pintle style injectors, as fuel atomization at anything other than full throttle (high velocity port flow) is superior, leading to better drivability and economy. Below is a picture illustrating what I mean about the spray patterns…(pic below)





The following is taken from SDS (simple digital systems fuel management systems) websight http://www.sdsefi.com/injectors.htm


Nozzle Types

There are essentially 3 different types of nozzles:

Pintle
This is the most common type and still the best. A tapered needle sits on a tapered seat. When the solenoid is energized, the core and needle is pulled back, allowing the fuel to discharge. This design has been well proven for over 30 years.

Disc
The Bosch disc type uses the same type of actuation mechanism as the pintle type but replaces the pintle with a flat disc and a plate with tiny holes. These work fine with a good spray pattern but are slightly more prone to deposits plugging the holes. The Lucas type buries the disc up inside the body to reduce the mass of the assembly for quicker response. The Lucas types typically have a very narrow spray pattern which can affect idle and throttle response in some cases.

Ball
The Rochester division of GM makes the ball type injector for OE applications as well as the larger flow race types for MSD. These use a ball and socket arrangement. These have excellent atomization and a wide spray pattern but are also prone to partial plugging by varnish deposits.

 

[MaineDSM]

Originally posted by 980VR41k
Here's some info reguarding the pintle, ball and disk types.

Uhhh, did that just say pintle (our stock injector type) is better than ball type? (The kind that everyone is raving about?)
I'm confused.