Enough Vacuum
Thread Starter
Instructor
Joined: Mar 2005
Posts: 159
Likes: 0
From: American Canyon Ca
Enough Vacuum
Is 9.5 inches idle and 11 inches max enough vacuum to run power brakes and lights in my 74. I'm thinking on getting this engine with these numbers from M&R HT383 480HP/510torque http://www.mandrengines.com/index.html. If not, will a vacuum reservoir to power brakes be enough or will I need a pump. Thanks
Just another Corvette guy
Joined: Feb 1999
Posts: 8,518
Likes: 3,863
From: Palm Springs, CA.
Paul,
18 to 22 inches is optimal. 9.5 to 11 is way below that. You will probably need to have large reservoir or a pump to keep those power brakes optimal.
Good luck,
Greg
18 to 22 inches is optimal. 9.5 to 11 is way below that. You will probably need to have large reservoir or a pump to keep those power brakes optimal.
Good luck,
Greg
Melting Slicks
Joined: Sep 2004
Posts: 2,655
Likes: 19
Mine is less than that and I have no problems. The low vacuum is due to a big cam with a lot overlap.
Keep in mind the vacuum will increase way over that when you let off the gas. So brakes are no problem.
Headlights may be slow. But I did reroute some of the vacuum system to make it work better.
Keep in mind the vacuum will increase way over that when you let off the gas. So brakes are no problem.
Headlights may be slow. But I did reroute some of the vacuum system to make it work better.
