As you can read in the regular tech section I now have, thanks to James (SeeRed), a Master Power electric vacuum pump designed for power brake systems paired with engines that produce low vacuum at idle. Mine was around 9 inches at an idle speed of 1000-1100 and I anticpate it will be even lower when I start up the new combination in a week or so as the new cam has a narrower LSA, 109 vs. 112, so I'm expecting 7-8 inches of vacuum.
It appears that the Master Power unit is intended to be tee'd into the vacuum booster line between the manifold and the power brake booster, It is setup with a switch that turns the unit on when the vacuum signal falls below 12 inches, meaning it will run always at idle and at large throttle openings.
Currently I pull signal for the MAP sensor off a junction block that gets vacuum from the manifold via .375" vacuum hose that goes to block and out again on the other side. Two small ports feed the MAP sensor build into the EMS-Pro unit and the cowl mounted mechanical vacuum gauge.
Vacuum generated by the pump would play havoc with these I suspect as it would pull from those lines as it is currently configured. My thoughts are run a separate vacuum line for the gauge and MAP off of the plenum, or use some kind of check valve to isolate the vacuum pump form the junction block when it is running. I'm not sure how it would get a turn off signal unless manifold vacuum actually pulled the check ballback against the pumps own vacuum.
I obviously haven't got that idea completely sorted out yet in my feeble brain.
Ideas...suggestions... better yet, proven solutions?
It appears that the Master Power unit is intended to be tee'd into the vacuum booster line between the manifold and the power brake booster, It is setup with a switch that turns the unit on when the vacuum signal falls below 12 inches, meaning it will run always at idle and at large throttle openings.
Currently I pull signal for the MAP sensor off a junction block that gets vacuum from the manifold via .375" vacuum hose that goes to block and out again on the other side. Two small ports feed the MAP sensor build into the EMS-Pro unit and the cowl mounted mechanical vacuum gauge.
Vacuum generated by the pump would play havoc with these I suspect as it would pull from those lines as it is currently configured. My thoughts are run a separate vacuum line for the gauge and MAP off of the plenum, or use some kind of check valve to isolate the vacuum pump form the junction block when it is running. I'm not sure how it would get a turn off signal unless manifold vacuum actually pulled the check ballback against the pumps own vacuum.
I obviously haven't got that idea completely sorted out yet in my feeble brain.
Ideas...suggestions... better yet, proven solutions?
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