Tips

Hot Cams' camshafts for oversize engines

Camshafts for oversize engines

Choosing a cam for a bored and/or stroked engine requires a bit of “fudging”. The same cam should, in theory, work for an engine that is oversize. The problem occurs when you increase the displacement by 20-30%. The engine now demands a similar increase in air/fuel supply which will require larger components (valves, ports, exhaust system, etc.). These modifications usually don’t occur due to the vehicle owner’s budget or lack of space to fit larger valves, etc. While larger displacement will guarantee more part-throttle and low-mid RPM torque, it is the higher RPM torque and horsepower that may require assistance. If you are trying to produce more horsepower from your oversize engine package via replacing the camshaft (a compromise), you need to choose a camshaft that will increase port flow. This is going to be achieved by opening the valves as quickly and as high as possible. So you are looking for a camshaft that has more lift. Due to certain design constraints, you may need to accept a camshaft that also has more duration.

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Honda CRF250-109 Cam Insert

Due to a casting variation in the head from the OEM, the 1108-GS and 1109-GS cams may or may not have enough clearance to avoid interference of the two parts.

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5046-1E Cam Assembly

For Polaris Outlaw 500 & Predator 500

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Hot Cams' Cam Facts

Cam Facts

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Hot Cams' Choosing the Right Cam

Choosing the Right Cam

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Hot Cams' camshafts for oversize engines

Camshafts for oversize engines

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Hot Cams' Valve Spring Facts

Valve Spring Facts

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Hot Cams' Builder Series Camshafts

Builder Series Camshafts

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