Achei isso por aí, em inglês, depois ponho uma tradução se alguém precisar:
de: http://www.pimix.com/lada/articles/E...rBeginners.htm
A quite "light" description, but good enough for a start.
Basic engine tuning for Lada 1200-1600 (85-110BHP)
This description is written for those who take part in motorsports actively. Since this description does not cover achieving the possible maximum power, these engines can be used on the city street too.
Prerequisites of the succesful power tuning is: technical knowledge, profession, some special tools and valve refinement tool, another with flexible shaft, polishing/finishing tool. Power increase is achieved mainly through modification of original parts, only the exhaust system will be rebuilt. Before starting the work, be sure to have a mechanically perfect engine.
1. Piston rods: get off the excessive weight at the upper part. Measure their weight: they have to weigh as equal as possible, within 1 gram. The bottom excessive weight must be removed too, but try and keep the original stability and balance of the four pieces: equal weights! After these, refine and polish the rods (direction: from one end to other, preventing cracks.) After finishing, the piston rods must have right angle.
2. Working on the cylinder head starts with the burning chamber. Preventing self ignition you have to round every sharp angle/corner by a radius of 0.5-1.0mm. At spark plugs holes radius is 3.0mm. On 1200ccm and 1300ccm engines 1.0-1.5mm will be shaved off from the cylinder head to increase compression ratio. On 1500ccm and 1600ccm this won't be done, in these cases the cylinder block will be shaved off: 1.0-1.5mm too. To have the cylinder breathe much better at higher RPM, intake valve seat must be enlarged to d=34mm, exhaust valve seat to 28.5mm. Taking a 45-degree valve refinement tool, an 1.5-2.0mm cone-shaped valve-seat is prepared. Its newly appeared edge is rounded with a radius of 0.5mm. Intake holes (in the head) are widened to 30mm, exhaust to 28.5mm by a tool with flexible shaft. Valve holder is rounded, intake and exhaust holes are polished.
3. All kinds of carburettors can be modified. Latest types (with vacuum advance + vacuum 2nd barrel opening) can be used without modification. Following tables contain jet information for 1200 and 1500 ccm engines:
1200/1300ccm:
mechanical 2nd barrel vacuum 2nd barrel
I. II. I. II.
Idle fuel jet 0.45 0.60 0.45 0.5-0.7
Idle air jet 150 180 150 155
Main jet 130 150 130 165-170
Small venturi 8.5 10.5 8.5 8.5
Fuel jet 1.50-1.90 1.50-1.90 1.65-1.90 1.65-1.90
Air jet 1.20 1.20 1.20 1.20
Mixture jet 1.70 1.70 1.70 1.70
1500ccm:
I. II.
Idle jets not modified
Main air jet 150 150-170
Main jet 130 150-165
Small venturi 8.5 8.5
4. Exhaust systems
4.1.: 1st version. The original system is used except the rear muffler, which can be prepared like shown on the picture below. This muffler increases power with 7 BHP comparing to the original one.
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4.2.: 2nd version. From the original system only the Y-pipe is used, from this point the whole system is replaced. the original 40mm(?) pipe is replaced with 50mm(?). In East Europe, the Robur truck's exhaust pipe is perfect to do this. This system does not contain silencers, only the muffler shown below. This system gives us extra 13BHP. The tailpipe must be 30cm's long. This size must be exactly kept, otherwise power increase won't take 100% effect!
note: the stuff in the muffler - written in Hungarian - is fibreglass.
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Postado originalmente por emtsuhako
