Custom Lower Injector Seals
Custom Lower Injector Seals
Hi,
This isn't really an FD specific thing, but I figured it was the best section to post this so I get the desired response because you guys play with fuel injectors more than 2nd gen or 1st gen guys.
Basically I have a 1.5" thick bit of Aluminum between my intake manifold (stock turbo FC), and my engine street ported 12A.
The hole all the way through the adaptor into the primary port runner is 9.5mm, the black pintle cap over the 91 T2 injectors is 9.5mm. The metal above has a 13.5mm shoulder. The Seal is 14.2mm uncompressed but fits into the hole fairly easily. The inner hole through the seal drops to about 8.5mm when in the bore. So the pintle cap pushes this out about 1mm. The injector is held down with a rainbow shaped piece of aluminum, so I can't really tention it in hard to compress the seal downwards but it is tight.
The diagram of the left describes how my injectors are currently *sealing* at the moment. Not really well. The shoulder is sloped because of a miscommunication between myself and my machinist.
The black is the metal that has been removed from the adaptor plate.
The red is a rubber injector seal apparently common according to my EFI specialist
The green is the hole through the injector seal
The brown is the injector.
I can't understand why this just won't seal up. I know there is a vacuum leak because I will have the car purring away, and spraying starting fluid at the injectors will just about bog the car to the point of stalling.
This is the 3rd time I have removed the intake manifold, header, drained coolant etc etc. I am getting really sick of pulling this appart. I hope someone on this forum can tell me what I'm doing wrong
Does anyone thing arranging the machining for the 3rd time (after this was made by someone else), and making it like the right diagram will fix my vac leak?
Whats a better and more reliable way of sealing it up? I know there are weld in injector bungs that seal the top and bottom, but arranging TIG welding and that complexity of machining will be prohibitively expensive.
I will try and digup some actual pictures of the install over the weekend.
Thanks for reading this longwinded post, I know someone can help me with some technical info!
This isn't really an FD specific thing, but I figured it was the best section to post this so I get the desired response because you guys play with fuel injectors more than 2nd gen or 1st gen guys.
Basically I have a 1.5" thick bit of Aluminum between my intake manifold (stock turbo FC), and my engine street ported 12A.
The hole all the way through the adaptor into the primary port runner is 9.5mm, the black pintle cap over the 91 T2 injectors is 9.5mm. The metal above has a 13.5mm shoulder. The Seal is 14.2mm uncompressed but fits into the hole fairly easily. The inner hole through the seal drops to about 8.5mm when in the bore. So the pintle cap pushes this out about 1mm. The injector is held down with a rainbow shaped piece of aluminum, so I can't really tention it in hard to compress the seal downwards but it is tight.
The diagram of the left describes how my injectors are currently *sealing* at the moment. Not really well. The shoulder is sloped because of a miscommunication between myself and my machinist.
The black is the metal that has been removed from the adaptor plate.
The red is a rubber injector seal apparently common according to my EFI specialist
The green is the hole through the injector seal
The brown is the injector.
I can't understand why this just won't seal up. I know there is a vacuum leak because I will have the car purring away, and spraying starting fluid at the injectors will just about bog the car to the point of stalling.
This is the 3rd time I have removed the intake manifold, header, drained coolant etc etc. I am getting really sick of pulling this appart. I hope someone on this forum can tell me what I'm doing wrong
Does anyone thing arranging the machining for the 3rd time (after this was made by someone else), and making it like the right diagram will fix my vac leak?
Whats a better and more reliable way of sealing it up? I know there are weld in injector bungs that seal the top and bottom, but arranging TIG welding and that complexity of machining will be prohibitively expensive.
I will try and digup some actual pictures of the install over the weekend.
Thanks for reading this longwinded post, I know someone can help me with some technical info!
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