hotcam=low vacuum?
Thread Starter
Staging Lane
Joined: Jan 2003
Posts: 70
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From: Grand Rapids,Mi
hotcam=low vacuum? I have a 2002 motor that is all stock except the hotcam and headers. I can't get enough vacuum out of it to operate my power brakes. I pulled the line off that connects to the booster check valve and checked vacuum there. I only get 14 inches. I need at least 18 to operate the brakes. I have the pcv hooked up and the small vacuum port on the back of the intake is capped off. The large one on the front drivers side of the intake is also capped off. Anyone else have this problem or have any ideas? Thanks, John
TECH Resident
Joined: Nov 2002
Posts: 996
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Re: hotcam=low vacuum? I have GM's hotcam and headers in my car and have no issues with my power brakes.
Could it be that your 68 Camaro's power brake booster requires more vacuum to operate properly (maybe it is less efficient than newer ones)
I have no idea how many inches of vacuum my car has at idle, but maybe your solution lies in replacing the power brake booster with a new model.
Good luck
Tommy
Could it be that your 68 Camaro's power brake booster requires more vacuum to operate properly (maybe it is less efficient than newer ones)
I have no idea how many inches of vacuum my car has at idle, but maybe your solution lies in replacing the power brake booster with a new model.
Good luck
Tommy
Re: hotcam=low vacuum? The Hotcam has *alot* of overlap for the power it makes, due to the soft ramps. Great for the valvetrain, not so great for the brakes.
Sounds like you have a requirement for more vacuum than a 98+ car, since I had great brakes with the Hotcam. Look into one of the cams that has more aggressive ramps, or a 114 LS. The hotcam is a 112. I doubt you will miss any power with 114 instead of 112.
Chris
Sounds like you have a requirement for more vacuum than a 98+ car, since I had great brakes with the Hotcam. Look into one of the cams that has more aggressive ramps, or a 114 LS. The hotcam is a 112. I doubt you will miss any power with 114 instead of 112.
Chris
