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What does the connecting rod connect the crankshaft to?

What does the connecting rod connect the crankshaft to?

A connecting rod is the part of a piston engine which connects the piston to the crankshaft. Together with the crank, the connecting rod converts the reciprocating motion of the piston into the rotation of the crankshaft. The connecting rod is required to transmit the compressive and tensile forces from the piston.

How do I know if my 2 stroke is bottom end?

Re: Bottom end 2 stroke Any vertical movement in the crank bearings is bad, you can check this by removing the flywheel cover and pushing up/down on the flywheel. Also bad is any vertical movement at the rod/crank pin, but this will require removing the cylinder to inspect.

How do you know when you need a bottom end rebuild?

Engine vibration is an indicator that the bottom end needs to be rebuilt. Checking for excess “play” in the crank with the top-end off is a sure way to tell. If there’s up and down play or a lot of side to side play, the crank bearings are more than likely worn out at a minimum.

What is a bottom end rebuild?

The bottom end refers to the conrod, and is Basicly a full rebuilt. The conrod and all bearings are normally replaced at this point, and on average most people do a bottom end every 2nd top end they do.

How often should a 4 stroke be rebuilt?

The bottom end on a four-stroke engine can typically see 100 hours of life, however, to be on the safe side, most riders will rebuild it at approximately the 80-hour mark. Again, when you’re rebuilding the bottom end, always rebuild the top end and throw in a new piston at the same time.

How are the rods and bearings related to the crank?

The bearings support the crank and bear the forces that are exerted by the rods as they reciprocate up and down. A thin film of oil is all that separates the bearing from the crank journals, so bearing clearances as well as oil viscosity and oil pressure must all be considered when building an engine for a particular application.

What’s the best way to remove a crank rod?

Place the handle on one of the connecting rod studs and with the other hand slap the head of the hammer with the palm of the hand just enough for the rod to rise above the crank journal. Very gently, so as not to scratch the crank journal, use a common screwdriver to push the upper bearing out of the connecting rod. Inspect the bearing as before.

What should I look for when replacing a crankshaft?

Another point to keep in mind if you are building a blown engine is the extra stress the blower drive puts on the end of the crank. The added stress and flexing over time can lead to fatigue cracks and crank breakage, so look for a crank that is available with a larger diameter nose.

Which is better cast iron or performance crankshafts?

Combustion temperatures and pressures are lower in a stock engine than a performance engine, and RPM is usually limited to about 6,500 RPM or less. Consequently, a cast iron crankshaft, original equipment powder metal rods and standard bearings are usually adequate for their intended use.

How are the rods oriented on a crank?

If the rods are designed for use on a crank that does not feature a radiused fillet, the rods may not feature a large chamfer on one side. Rod orientation can then be obtained by orienting rod with its bearing tang grooves biased toward the pan rail (outside) or cam side (inside).

What should be the rod ratio of a 4 cylinder engine?

Some engine builders say a “good” rod ratio is anything 1.55 or higher. Production engines may have rod ratios that range from 1.4 to over 2.0, with many falling in the 1.6 to 1.8 range. Four cylinders tend to have lower rod ratios (1.5 to 1.7 range) while many V6s have somewhat higher rod ratios of 1.7 to 1.8.

Another point to keep in mind if you are building a blown engine is the extra stress the blower drive puts on the end of the crank. The added stress and flexing over time can lead to fatigue cracks and crank breakage, so look for a crank that is available with a larger diameter nose.

What kind of crankshafts do Chevys use?

Our 9000 series crankshaft comes in a wide range of strokes & rod combinations for chevy, ford, chrysler & more. Budget minded, performance driven.

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Ruth Doyle