i want to have 85hp at crank from my 1116cc with single carb and compression ratio not to exceed 10:1 also it must be cheap and easy and preferably to be economic

ahmed_mahdy2003 said:

i want to have 85hp at crank from my 1116cc with single carb and compression ratio not to exceed 10:1 also it must be cheap and easy and preferably to be economic

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You can get close to that by swapping the engine for a 1299/ 1301cc Uno/ Strada/ X19/ 128/ Delta engine that came with a twin choke Weber carb. Those were pushing out nearly 70bhp as standard, and would be much cheaper than trying to mod your 1116cc engine.

You could also use the X19/ Strada/ Delta 1500 engine, or the 1600 Tipo engine. These should directly swap in and both are pushing out around 80+ bhp.

Alternatively, find a scrapped 127 Sport or 127 GT engine and swap them in. Both were pushing out nearly 70bhp, and the Sport engine is a real screamer at only 1050cc!

If you must keep the 1116cc engine, your first mod will be to fit the twin choke Weber that came as standard on the 1300 version of the engine (or from a mk1 Uno 60S if you can find one). You'll also need the manifold and possibly throttle cable/ brackets. Some versions of the 1116cc came with the twin choke Weber (mk1 Uno 60S) as standard, and it helped the engine push out nearly 58bhp.

Other than that, you're getting into expensive engine tuning (bigger valves, ported/ gas flowed head, free flowing exhaust and induction systems. Not really worth it when it is cheaper just to swap the engine for the same power gain.

Good luck!