Pintle or disk, which is better?
Pintle or disk, which is better? From what I understand Delphi/Lucas injectors are generally disk type and SVO/Bosch ones are pintle type.
Which type (if any) is more reliable, easier to tune, flow more reliably, etc.?
Which type (if any) is more reliable, easier to tune, flow more reliably, etc.?
TECH Enthusiast
Joined: Sep 2004
Posts: 564
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From: Omaha, NE
Disc injectors have a slightly greater dynamic range, meaning that they will flow more consistantly with very lower or higher duty cycles. Beyond that it is hard to beat the consistancy and reliability of a Bosch injector. The Delphi (Rochester, AC Delco) I always thought was a ball style, maybe they changed.
Teching In
Joined: Nov 2005
Posts: 26
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As per Racetronix website :
Performance advantages over pintle injectors (i.e. Ford / Bosch & Accel types) as listed by Delphi:
• The flat mating surface ensures that no excess fuel is present to evaporate and therefore, no deposits or clogging can occur.
• Compatible with alternative fuels (i.e. Methanol)
• Longer service life
• High-speed disc action allows wider dynamic flow range for improved idling
• Quieter operation
• Revolutionary disc design resists build up deposits which can affect fuel flow.
• No Fuel leakage for quicker starts
Performance advantages over pintle injectors (i.e. Ford / Bosch & Accel types) as listed by Delphi:
• The flat mating surface ensures that no excess fuel is present to evaporate and therefore, no deposits or clogging can occur.
• Compatible with alternative fuels (i.e. Methanol)
• Longer service life
• High-speed disc action allows wider dynamic flow range for improved idling
• Quieter operation
• Revolutionary disc design resists build up deposits which can affect fuel flow.
• No Fuel leakage for quicker starts
Most of these advantages look like "could happen"
bogey-men, more than "will happen". I don't know of
any specific pintle-style advantages but the only
thing about the disc style that looks helpful, is the
low pulse width dynamic response ("high speed disc
action") and there, you're right back into our
"what the hell is my new injector offset" problem -
too fast being only the flip side of too slow, not
necessarily any improvement.
I have a Ford (Lincoln) well past 100Kmiles with
plain old pintle injectors, and the only one that had
a problem, was silted up in the screen (nothing to
do with pintles). So I wouldn't place much stock in
the marketing benefits. And it doesn't appear that
there is any better in-family consistency of offset
vs pressure, voltage than between-random-types,
from what little data & calculating I've been able to
put together. So it looks like shop on price, to me.
bogey-men, more than "will happen". I don't know of
any specific pintle-style advantages but the only
thing about the disc style that looks helpful, is the
low pulse width dynamic response ("high speed disc
action") and there, you're right back into our
"what the hell is my new injector offset" problem -
too fast being only the flip side of too slow, not
necessarily any improvement.
I have a Ford (Lincoln) well past 100Kmiles with
plain old pintle injectors, and the only one that had
a problem, was silted up in the screen (nothing to
do with pintles). So I wouldn't place much stock in
the marketing benefits. And it doesn't appear that
there is any better in-family consistency of offset
vs pressure, voltage than between-random-types,
from what little data & calculating I've been able to
put together. So it looks like shop on price, to me.
I'm currently running the Delphi/Lucas disk ones. 
