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| The main problem with converting fuel-injected vehicles is the high internal volume tuned intake manifold. While this intake manifold is great for improving torque, it also causes a fuel signal transport delay with mixer-style propane conversions. This delay can lead to costly repairs from lean fuel-mixture backfires. The solution of course is to keep the fuel out of the intake manifold with vapour injectors at the intake ports. Besides eliminating lean mixture backfires, port vapour injection also makes the engine more responsive. While the old Impco fumigation systems resulting in propane fuel economy to be around 75% to 80% of the car's gasoline economy, Technocarb's SVI System resulting in a propane fuel economy of about 90% of the car's gasoline economy. Power only drops by about 10% too. While not a DIY project for a novice mechanic, Sequential Vapour Injection is quite straightforward and relatively easy to do. Technocarb has very kindly supplied us with the following documents for their Sequential Vapour Injection System: |
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