mark69sportsroof 31 Report post Posted February 23, 2017 Hi Everyone, Does anyone have a pic of an electric vacuum pump setup on a big block. Right now I'm running 6 psi at idle. I have the FE 390 stroked to 445 with 11-1 compression. The power disc brakes need more vacuum to get to work properly. Thanks Mark 7 papedVem, Mavavto, evewEn and 4 others reacted to this Quote Share this post Link to post Share on other sites
Phils69 27 Report post Posted February 24, 2017 Have you tried a vacuum canister? I bought an electric pump and had trouble with the switch working properly. I then tried a canister, which is by far the cheaper solution, and it works well for me. I'm sure I have that brand new pump in a box somewhere in the shop if you do decide to go that route. Quote Share this post Link to post Share on other sites
RPM 1,190 Report post Posted February 24, 2017 Within the last week I read on one of the Mustang sites where a guy added a pump. Might've been on MustangSteve dot com. Quote Share this post Link to post Share on other sites
mark69sportsroof 31 Report post Posted February 25, 2017 Thanks guys. I'm not sure what the difference is between the canister and a pump? Could someone explain difference. Thanks Mark Quote Share this post Link to post Share on other sites
mark69sportsroof 31 Report post Posted February 27, 2017 I looked on mustang Steve's site but found nothing. Does anyone know the difference. Mark Quote Share this post Link to post Share on other sites
Dave R. 85 Report post Posted February 27, 2017 As I recall, a canister connects to a vacuum source and stores vacuum that the engine makes. A line from the canister to where the extra vacuum is needed supplies the vacuum as needed. Nothing but a hollow ball or can. A pump actually produces vacuum via an electric motor driven pump and supplies vacuum to the system. Dave R. Quote Share this post Link to post Share on other sites
mark69sportsroof 31 Report post Posted February 28, 2017 Thanks Dave, makes sense. Hopefully someone will have pics of both so I can get a better idea of what I'm dealing with. Mark Quote Share this post Link to post Share on other sites
barnett468 418 Report post Posted February 28, 2017 You first should set your ignition timing curve so it is optimal for your engine . If the timing is lower than optimal at idle it will have lower vacuum than it could. I have only seen vacuum as low as yours on engines that had a problem or on racing engines, not street engines. A vacuum can is merely a can/reservoir that holds additional vacuum so the brakes work a little longer, like for another 2 or 3 quick pushes in slow traffic before all the vacuum is gone and the pedal becomes hard to depress . A vacuum pump is a pump that sucks which simulates engine vacuum thereby improving brake function, however, there are about 50 different vacuum pumps and some suck more/better than others . If you can not increase your vacuum on its own you very well made need a pump AND an auxiliary vacuum can. Vacuum can One of a few different styles of vacuum pumps. . Quote Share this post Link to post Share on other sites
Ash 145 Report post Posted February 28, 2017 I'm going to fit a vacuum pump on my stroked FE as well. Quote Share this post Link to post Share on other sites
Phils69 27 Report post Posted February 28, 2017 I have to say I really disliked the vacuum pump just because of the noise. It just didn't seem right to have that electric pump running buzz coming from the engine bay Quote Share this post Link to post Share on other sites
RPM 1,190 Report post Posted February 28, 2017 I have to say I really disliked the vacuum pump just because of the noise. It just didn't seem right to have that electric pump running buzz coming from the engine bay Apparently your exhaust system is too quiet :) 1 barnett468 reacted to this Quote Share this post Link to post Share on other sites
Ash 145 Report post Posted February 28, 2017 Bahaha, that was a crack up, RPM! I doubt I will have that issue, even with having an electric vacuum pump, water pump, fuel pump and power steering. All kinds of buzzing going on. Quote Share this post Link to post Share on other sites
mark69sportsroof 31 Report post Posted March 1, 2017 Thanks everyone for the advice. It appears that I need a vacuum pump to solve my problem. Barnett468 what brand and type would you recommend? Thanks Mark Quote Share this post Link to post Share on other sites
Phils69 27 Report post Posted March 1, 2017 Nope. Nothing quiet about it, 408w, AFR205's and Flowmasters. It's pretty loud actually but you could still hear the pump come on and off sitting in the drivers seat at idle. I found with my setup the canister works better for me. Quote Share this post Link to post Share on other sites
