View Full Version : Interchangable Injectors?
Turbo9k
15-05-08, 10:13 PM
Im changing the Injectors in an 88 porsche 944 turbo, They are Bosch injectors with green tops. Im replacing them for bigger ones, Think the Saab could use them? Any ideas??
Albert Trout
16-05-08, 10:30 AM
Im changing the Injectors in an 88 porsche 944 turbo, They are Bosch injectors with green tops. Im replacing them for bigger ones, Think the Saab could use them? Any ideas??
Are they high impedance? If they are then yes, technically, you can change them. But there's no point unless you mod the ECU or put in a new engine management system.
Mr.Wallace
16-05-08, 01:38 PM
hey are Bosch injectors with green tops.#
Think the Saab could use them? Any ideas??
Only one way to find out for sure.
What are the indicators of worn out injectors?
I've read that injectors shouldn't ever go above 80% full cycle. Also if I were to get my hands on some 2nd hand injectors for my NA b202 what ones can I use and what cars do they come off?
Saab-Daniel
18-05-08, 05:08 PM
Injectors don't wear out, they might leak or the spray-pattern might go bad, but this can be replaced and the injector-solenoids can be ultrasonic-cleaned.
Daniel.
Mr.Wallace
18-05-08, 08:05 PM
Injectors don't wear out
they might leak or the spray-pattern might go bad,
I call that wearing out.
Injectors don't wear out, they might leak or the spray-pattern might go bad
So what are the indicators of that then?
I call that wearing out.
Leaks and poor spray patterns are caused by the nozzle clogging, which can be sorted with a simple ultra-sonic clean. If they wore then the only fix would be replacement of parts, which just isn't needed.
Saab-Daniel
19-05-08, 02:27 PM
Leaks and poor spray patterns are caused by the nozzle clogging, which can be sorted with a simple ultra-sonic clean. If they wore then the only fix would be replacement of parts, which just isn't needed.
Exactly my point...
Daniel.
So nobody knows of any indications that injectors aren't working properley? Or what other (read: upgraded) injectors I could pull from other cars?
question dodge some more guys :confused:
So what are the indicators of that then?
Unfortunately with the injectors on the car there is very little to show if there are problems. The only way to check is to remove the injectors, place on a proper test rig (Asnu or something similar) and see what the patterns and flow rates are like.
However, if the engine has covered 100K+ then having the injectors cleaned will almost certainly be beneficial, especially if the tank has been run low on occassion or grotty fuels used.
Unfortunately with the injectors on the car there is very little to show if there are problems. The only way to check is to remove the injectors, place on a proper test rig (Asnu or something similar) and see what the patterns and flow rates are like.
However, if the engine has covered 100K+ then having the injectors cleaned will almost certainly be beneficial, especially if the tank has been run low on occassion or grotty fuels used.
Thanks alex I think I'll look into that some more!
Mr.Wallace
19-05-08, 05:48 PM
You can't surely be saying they never wear out? If a malfunctioning or semi-blocked fuel injectors are at the root of his problem then cleaning may be the answer but all injectors wear out unless there low pressure or use ceramic tips, after a few million on off cycles and decades of heat soak, its not unreasonable to say the injectors get worn out.
(Asnu or something similar) and see what the patterns and flow rates are like.
He could use 4 glass beakers and simply look at the spray pattern and measure the total fuel in each beaker after a minute of cracking with the plugs out.
TheRedBaron
19-05-08, 05:51 PM
FWIW, a SAAB indie I know says injectors very rarely clog and almost never fail even at high mileage.
I also know from taking my rail off that the injectors in my car still have fine o-rings and are fairly clean after ~180k miles.
Albert Trout
19-05-08, 05:57 PM
You can't surely be saying they never wear out?
I think that a car will wear out before injectors ever do. The 1 million mile 900 didn't need its injectors replaced.
You can't surely be saying they never wear out? If a malfunctioning or semi-blocked fuel injectors are at the root of his problem then cleaning may be the answer but all injectors wear out unless there low pressure or use ceramic tips, after a few million on off cycles and decades of heat soak, its not unreasonable to say the injectors get worn out.
He could use 4 glass beakers and simply look at the spray pattern and measure the total fuel in each beaker after a minute of cracking with the plugs out.
The chances that the injectors need cleaning is pretty high, so for the effort of removing them, they might as well be cleaned. Its not as if the cleaning (which will also include new filters and o-rings) is an expensive operation either.
Mr.Wallace
19-05-08, 09:00 PM
injectors very rarely clog and almost never fail even at high mileage.
The fuel quality can account for difference in a partially blocked and clean as a whistle injector, some fuels have cleaners some have heavier elements that turn into gum over the years.
I think that a car will wear out before injectors ever do.
Probably.
The 1 million mile 900 didn't need its injectors replaced.
A one in a million Saab story.
Its not as if the cleaning (which will also include new filters and o-rings) is an expensive operation either.
I agree £6 per injector is not to expensive.