I need some help with a particular problem I'm having with assembling my Cobra intake on my GEN I.
I never really liked how on the Cobra intake an electric motor holds my IMRC plates open, and know they tend to fail, so I decided to use my GEN I vacuum controllers with my Cobra IMRCs. I set them up as follows...
First, I put the cobra plates on the Mark controller rods, then I put the cobra IMRC adjusting screw stops in stock location, after cutting off what wasn't needed.
finally, I modified the vacuum IMRC controller brackets and mounted them upside down, actuating the rods from a hole drilled on the opposite side. This closes the IMRC plates under vacuum, and they open up when vacuum is released, just as in the GEN I intake.
Finally I adjusted them to Service Manual specs. They now fully close at about 12lbs of vacuum, and open when vacuum is released.
I've attached a picture of the IMRC setup with the vacuum lines and one of the mocked up intake. Note from the pictures that I've also added a coolant line from the drivers side water jacket, steeda underdrive pulleys and timing adjuster, 160 AMP alternator, accel coil packs, and I've powdercoated most everything with a clearcoated aluminum finish. If the pictures don't show they are on the second page of my Cardomain web site, below.
http://www.lincolnsclub.org/forum/user_files/490.html
http://www.lincolnsclub.org/forum/user_files/491.html
My problem is where and how to route the vacuum lines on the cobra intake. I have the GEN I IMRC vacuum lines, with 3 small connectors and 1 large connector. 2 of the small ones go on the two vacuum actuators on the IMRCs. I have no idea where the 3rd one goes (fuel pressure regulator maybe???)
The large connector goes to a vacuum port on the intake; It will just reach the back one, on the passenger side.
I'm not sure if there is some controller or solenoid that I am missing to release the vacuum and open the IMRCs at the right RPMs.
As I'm working with an unused crate engine, I don't have the original
setup to work backwards from.
I've been told that you can just hook to the intake, and that the vacuum drops after 3K RPM, which opens the IMRCs. I'm not completely convinced that it will work, because if there is any vacuum at all, the IMRCs wouldn't open all the way.
The Service Manual mentions both a "secondary air injection control solenoid vacuum valve" and "IMRC control solenoids", which I don't have and can't find a diagram of. Are either of these what I may be missing?
Also, if this is what is needed, where would I connect it/them to the manifold and how does it/they plug into the PCM?
Note that I will delete the EGR and the fuel canister vapor purge (not needed as this is going into a 57 TBird = no emissions requirements in GA). I'm also not using any manifold vacuum for my brakes, as I am installing a hydroboost unit from a late model mustang.
Any help/insight and especially pictures of a working setup are appreciated.
Thanks.
I never really liked how on the Cobra intake an electric motor holds my IMRC plates open, and know they tend to fail, so I decided to use my GEN I vacuum controllers with my Cobra IMRCs. I set them up as follows...
First, I put the cobra plates on the Mark controller rods, then I put the cobra IMRC adjusting screw stops in stock location, after cutting off what wasn't needed.
finally, I modified the vacuum IMRC controller brackets and mounted them upside down, actuating the rods from a hole drilled on the opposite side. This closes the IMRC plates under vacuum, and they open up when vacuum is released, just as in the GEN I intake.
Finally I adjusted them to Service Manual specs. They now fully close at about 12lbs of vacuum, and open when vacuum is released.
I've attached a picture of the IMRC setup with the vacuum lines and one of the mocked up intake. Note from the pictures that I've also added a coolant line from the drivers side water jacket, steeda underdrive pulleys and timing adjuster, 160 AMP alternator, accel coil packs, and I've powdercoated most everything with a clearcoated aluminum finish. If the pictures don't show they are on the second page of my Cardomain web site, below.
http://www.lincolnsclub.org/forum/user_files/490.html
http://www.lincolnsclub.org/forum/user_files/491.html
My problem is where and how to route the vacuum lines on the cobra intake. I have the GEN I IMRC vacuum lines, with 3 small connectors and 1 large connector. 2 of the small ones go on the two vacuum actuators on the IMRCs. I have no idea where the 3rd one goes (fuel pressure regulator maybe???)
The large connector goes to a vacuum port on the intake; It will just reach the back one, on the passenger side.
I'm not sure if there is some controller or solenoid that I am missing to release the vacuum and open the IMRCs at the right RPMs.
As I'm working with an unused crate engine, I don't have the original
setup to work backwards from.
I've been told that you can just hook to the intake, and that the vacuum drops after 3K RPM, which opens the IMRCs. I'm not completely convinced that it will work, because if there is any vacuum at all, the IMRCs wouldn't open all the way.
The Service Manual mentions both a "secondary air injection control solenoid vacuum valve" and "IMRC control solenoids", which I don't have and can't find a diagram of. Are either of these what I may be missing?
Also, if this is what is needed, where would I connect it/them to the manifold and how does it/they plug into the PCM?
Note that I will delete the EGR and the fuel canister vapor purge (not needed as this is going into a 57 TBird = no emissions requirements in GA). I'm also not using any manifold vacuum for my brakes, as I am installing a hydroboost unit from a late model mustang.
Any help/insight and especially pictures of a working setup are appreciated.
Thanks.