Recently I overhauled Suzuki Maruti F8B 800cc 3 cylinder engine running on contact points distributor ignition system. Along with overhaul, I did some of changes including increasing compression ratio from 8.8 to 10.4 by shaving engine head by 1.26mm, power lynz
https://youtu.be/vT7kdwbEG8s
, power ringz on the back of intake valves, and later on spark duration enhancer made exactly as per the patent and used non resistor plugs along with it.
https://patents.google.com/patent/US3939814A/en
This improved engine response really so much and solved all vibration issues inherent with F8B engine.
There is noticeable power difference about 30 percent difference in acceleration time in all engine rpms. Engine cranks to life in half a turn and is smooth at all rpm
Due to increased torque, to improve fuel consumption and to save tires from wearing prematurely I tried reducing carburetor secondary pilot jet from 92.5 to 90 and secondary main jet from 175 to 150
No one could identify difference in power compared to stock after reducing the carburetor jets. In fact, even with reduced fuel, engine is eager to accelerate at all rpms. Without spark duration enhancer, engine struggled to climb speed after 80kmph, now after this mod, there is no problem for the engine to club speed upto 100kmph (we don't drive that fast, keeps speeds less that 70kmph since the car is 25 years old)
Fuel economy prior to overhaul was 9 to 12kmpl prior to modification. Right now its in the range of 20 to 30kmpl depending on driving condition.
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