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engine:vacuumrouting
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engine:vacuumrouting [2025/04/30 13:48] 114.119.139.78 old revision restored (2023/12/14 00:33) |
engine:vacuumrouting [2025/05/09 15:57] (current) 114.119.138.214 old revision restored (2025/01/24 07:08) |
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| Vacuum routing is slightly different between certain model years (and US/UK models). Most of this is US-centric information. | Vacuum routing is slightly different between certain model years (and US/UK models). Most of this is US-centric information. | ||
| + | The US cars had air pumps equipped for emissions compliance. Most owners removed this system due to the fact that it would frequently break. The diverter valve and the associated plumbing is usually removed. Additionally, | ||
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| + | {{: | ||
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| + | As explained below, the two purple boxes are the vacuum solenoids for fuel pressure and ignition. When the solenoids are not energized, the yellow and green lines are connected (ignition), and the yellow and orange lines are connected (fuel). When the solenoids are energized the blue and green lines are connected (ignition) and the red and orange lines are connected (fuel). | ||
| ==== Vacuum Solenoids ==== | ==== Vacuum Solenoids ==== | ||
| - | == Fuel Pressure & Ignition == | ||
| There are a pair of solenoids mounted under the intake plenum for fuel pressure and ignition. Lotus refers to these as part # | There are a pair of solenoids mounted under the intake plenum for fuel pressure and ignition. Lotus refers to these as part # | ||
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| + | == Ignition == | ||
| + | |||
| + | Located beneath front of plenum chamber. Function is to advance ignition on operation of choke. A micro-switch operated by the dashboard end of the choke cable (which also operates the choke tell tale lamp) energises the ignition solenoid. The signal to the distributor vacuum advance capsule (normally connected to No.1 cylinder throttle | ||
| + | edge drilling) is then switched to the vacuum pump, and thus full ignition advance is achieved, together with an increase in engine idle speed. | ||
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| + | == Fuel Pressure == | ||
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| + | == Replacement == | ||
| I took some time to test and investigate these solenoids (they are identical parts, but serve two different purposes). | I took some time to test and investigate these solenoids (they are identical parts, but serve two different purposes). | ||
engine/vacuumrouting.1746020886.txt.gz ยท Last modified: 2025/04/30 13:48 by 114.119.139.78
