Engine Vacuum vs MAP - Holley Performance Products Forums
WEBRoughly, this equates to: Vacuum = 30 - kPa * 0.3 or kPa = 100 - inHg/ 0.3 However, the disparity I'm seeing is, at idle, if I put a vacuum gauge directly to the intake manifold, it reads 14.5 inHg. The readout on my Holley Sniper says I'm idling at 40 kPa. 14.5 inHg would be around 52 kPa. 40 kPa would be around 18 inHg.
Holley 750 Manifold & Ported Vacuum Connections
WEBTweet. #2. 10-22-2021, 09:21 AM. The full manifold vacuum port has vacuum at idle and part throttle. The ported (timed) vacuum port does not have vacuum at idle, part throttle only. May God's grace bless you in the Lord Jesus Christ. '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, Eagle 3.470" forged steel crankshaft & H-beam rods ...
Vacuum Ports (3) - Holley Performance Products Forums
WEB06-10-2012, 08:07 PM. Vacuum Ports (3) Below is a copy of the size fittings for ports on the MSD. I got mine in the plumbing department at ACE hardware. My PCV was 3/8 and advance was 1/8 hose, but my PCV went into a fitting on the intake. I think you need a 1/4 thread to 3/8 barbed, or go 1/4 to 1/4 and use a coupler to get the hoses to mate ...
PCV valve hook up help. - Holley Performance Products Forums
WEB12-30-2023, 09:42 PM. Yes, the 3/8" nipple is a good place for the PCV hose. It's best to have the cars original vacuum system plugged into an intake manifold fitting. You shouldn't have a power brake booster hose on the same fitting as the PCV valve. And there should be a fresh air breather on the other valve cover.
Vacuum Routing - Holley Performance Products Forums
WEB12-29-2020, 09:57 AM. Yes, you could do that. However, components that use a lot of vacuum (PCV valve & large power brake boosters) should be run off the engine, not a vacuum distribution tree. May God's grace bless you in the Lord Jesus Christ. '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, Eagle 3.470" forged steel crankshaft & H ...
Hooked up manifold vacuum advance, question. - Holley …
WEBTweet. #6. 08-16-2019, 04:38 PM. Yes, but it's always been there. After hooking up the advance to manifold vacuum, it started Learning and the Learn Table is at +43% instead of about +7% from before. I was curious if this would be normal or indicates something went wrong. There is only about 200 miles on the install.
Timing & vacuum advance, SBC HEI. - Holley Performance …
WEBMay 21, 2020 · My problem is idle is 15° and when I plug in the vacuum line it jumps to 40°. So use ported vacuum. Vacuum advance should be connected to full manifold vacuum; not ported. 8°-10° of vacuum advance is the typical limit (some canisters are adjustable). The (ported) timed spark port is only for emissions/EGR engines ( ).
Constant vacuum on ported port. - Holley Performance Products …
WEBJul 8, 2013 · I'm guessing the carburetor has the wrong metering block gaskets installed. Vacuum advance should be connected to full manifold vacuum; not ported. 8°-12° of vacuum advance is the typical limit (some canisters are adjustable). The (ported) timed spark port is only for emissions/EGR engines.
SBC PCV Valve & Brake Booster Vacuum
WEBJan 8, 2016 · The Terminator throttle body has two "full manifold vacuum" ports. The larger one can be used for a PCV valve or power brakes; but not both. If you have both, one connects to the Terminator and the other to the intake manifold. The 1st one I found. Yes, that additional front port can be used too.
Ford 302 vacuum tree, thermostat housing.
WEBMay 5, 2021 · 1st, you can't just change the vacuum advance from the (ported) timed port to full manifold vacuum; the entire timing advance curve should be revamped for it. 2nd, it shouldn't matter that the ignition timing retards a little in gear, because full manifold vacuum advance significantly increases the amount of idle timing anyway.