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I was expecting half a 4 cylinder gasoline engine and half a 4 cylinder diesel engine grafted together so 2 cylinders are gas and two are diesel. A real Frankenstein engine lol.
Run this same car but instead of feeding the two fuels separately, mix diesel into gasoline and see how much diesel you can add before the engine wont tolerate it anymore lol. Like make different ratios of gas to diesel and see what mix runs best.
Prior to WWII, many tractors in the US were spark ignition engines running on distillate, which is like a light diesel fuel. They were started on gasoline from a small fuel tank and then switched to distillate once warm. They also had the exhaust heat constantly heating the intake manifold. These engines were also low compression. Try putting 2 head gaskets to lower the compression ratio and heat the intake manifold to see if a Lada will run on winter grade diesel on all 4 cylinders.
There is a good reason Diesels are fuel injected, with this setup there is zero control of when combustion occurs hence the knocking. Now if you could set up the other 2 cylinders with fuel injectors, raise the compression, and somehow figure out how to time it that would be cool. This would probably be much easier to start with a 4 cyl Diesel engine and convert half of it to gasoline.
Back in 1976 I had an old Ford pickup with a flathead V8 that I started on gasoline then switched to 100% diesel after it warmed up. Did a lot of miles with that setup over 22 years.
Hot rod the stuff out of the Lada and see how much power you can get out of it. 2carbs, 4 carbs, split exhaust, straight exhaust, turbo, nitrous........give it the works until she blows.
You really need a "Priestman Vaporiser" but in lieu of that - Modify the exhaust flow, and the diesel manifold so that you can direct hot exhaust gases around the diesel manifold (build a jacket around the manifold). This will heat the manifold to help vaporise the diesel fuel. Also, you could add a series of metal rods across the insides of the manifold draught tubes before building the jacket - This would conduct heat directly into the throats of the manifold, and will directly vaporise the diesel fuel as it flows over them - Sections of 3mm or 4mm thick nails would suffice for the rods. This is how we made a petrol engine run on central heating oil, and we based the idea on the vaporisers in our TVO tractors. Try it for yourselves!
When I worked for the Freightliner dealership in my area, we got an Isuzu NPR boxtruck in because the driver put 45 gallons of gasoline in the tank atop about 3-4 gallons of diesel. I needed fuel in my '85 F150, so we poured a tankful in. It ran *okay*; had a bit of a ping to it under heavy load and was hard starting but it was able to burn the stuff. And I could smell the diesel exhaust.