Bosch 3 Injectors
Thread Starter
Pro
Joined: Apr 2014
Posts: 719
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From: Helotes Texas
Bosch 3 Injectors
So almost done with my Holley ECU swap and I put in a set of used (FIC?) bosch 3's I have no leaks but I noticed they sit in the intake manifold really really low, I've been trying to find pictures of others and how they look installed but not much luck from an angle where you can see it how far it sits into the manifold.
Southbay uses an adapter and at least it looks like they sit higher than the set I have?
With no leaks I assume I'm just overreacting but this car has been on fire once already when a o ring failed on the crossover tube many years ago, and I'd rather not watch my pride and joy go up in flames again
Southbay uses an adapter and at least it looks like they sit higher than the set I have?
With no leaks I assume I'm just overreacting but this car has been on fire once already when a o ring failed on the crossover tube many years ago, and I'd rather not watch my pride and joy go up in flames again
Safety Car
Joined: Aug 2009
Posts: 3,751
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From: Melbourne, Victoria, Australia
Hi did the FIC bosch injectors come with 3 "o" rings on each? one on top and two near the bottom of the injectors.
You need the two ''O'' rings near the bottom of each injector, to prevent them sinking into the manifold under the fuel pressure.
Without those two ''o'' rings the top of the injector will leak, I run the bosch 3 injectors and have not had any problems with the three o rings on each injector.
The original injectors had larger bodies that sit on the manifold injector recess boss.
(See the pages of a related thread below further down the page, you can see the yellow injectors with the 3 "o" rings fitted correctly)
You need the two ''O'' rings near the bottom of each injector, to prevent them sinking into the manifold under the fuel pressure.
Without those two ''o'' rings the top of the injector will leak, I run the bosch 3 injectors and have not had any problems with the three o rings on each injector.
The original injectors had larger bodies that sit on the manifold injector recess boss.
(See the pages of a related thread below further down the page, you can see the yellow injectors with the 3 "o" rings fitted correctly)
Last edited by gerardvg; Aug 19, 2020 at 07:40 PM.
Burning Brakes
Joined: Jan 2015
Posts: 875
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I put 22# Bosch 3 injectors in my 89. And it ran real lean based on the datalogs. So I swapped them out with 24# Bosch 3 injectors and found some of the extra o-rings were cracked and fell apart when removing the 22# injectors. I'm guessing those extra o-rings weren't as good of a quality compared to the o-rings on the ends. But after putting in 24# injectors and datalogging, I found my BLM's were in the proper range of +/-10 of 128 BLM.
Thread Starter
Pro
Joined: Apr 2014
Posts: 719
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From: Helotes Texas
Thank you @stew'86MCSS396 that's exactly how mine sit in the manifold I feel better about firing it up now.
@gerardvg Yea these are the same it was just weird to see them so deep into the manifold.
@gerardvg Yea these are the same it was just weird to see them so deep into the manifold.
