Camshaft duration and rpm range
[DOCX File]CAMSHAFTS AND LOBES:
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In choosing a CAMSHAFT for your 4X4 vehicle and tow vehicles, your ultimate goal is to increase both horsepower and torque within a useable RPM range to allow the engine to operate with the least amount of vacuum throttle opening. The result - better fuel economy, smoother idling, cooler running, and longer engine life. J. eep 2.5-4.2-4.0 Engines
[DOC File]Twin Tec
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terms the idle rpm. For 3-stage VTEC engines, idle rpms take on a much broader meaning. It is no longer the steady 750rpm or so for an engine at rest. For 3-stage VTEC, idle rpm also means low running rpm during ideal operating conditions, i.e. closed or very narrow throttle positions, flat even roads, steady speed, etc. It is an idle rpm range.
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It is a dual-equal cam phasing system that adjusts camshaft timing at the same rate for both intake and exhaust valves. The system allows linear delivery of torque, with near-peak levels over a broad rpm range, and high specific output (horsepower per liter of displacement) without sacrificing overall engine response, or driveability.
[DOC File]1
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Some large displacement engines with high overlap/long duration camshafts may not idle properly at the nominal 1,000 RPM and 13.5 AFR settings used in the standard setup files. You may have to increase the idle RPM to a higher value such as 1,100 RPM and enrich the idle to 12.5-12.8 AFR.
Cam and compression ratio compatibility
Camshaft duration and why is it important? Duration is the period of time, measured in degrees of crankshaft rotation, that a valve is open. Duration (at .050î lifter rise) is the deciding factor to what the engines basic RPM range will be. Lower duration cams produce the power in the lower RPM range.
[DOC File]2007 Honda CR-V
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300/8/.26=144cfm 350/8/.26=168cfm 400/8/.26=192cfm RPM at peak horsepower will be 2,000 divided by the displacement of one cylinder x airflow @ 10? of water. Use 1,267 @ 25" of water, or 1,196 @ 28" of water. The more airflow available to the cylinder, the higher the rpm required to reach peak horsepower.
[DOCX File]Latest Seminar Topics for Engineering CS|IT|ME|EE|EC|AE|CA
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As a general rule, cams with 220-235 degrees of duration tend to produce good low end torque. Cams with 235-250 degrees of duration tend to work best in the mid-ranges and cams over 260 degrees work best for top end power. Camshaft overlap duration less than 30 …
[DOC File]Asimetec - MotoParts
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At higher rpm, a hydraulically actuated spool valve causes a locking pin to engage the secondary rocker arm with the primary one, transitioning the secondary valve into a high-lift/long-duration mode that improves output on the top end. VTC allows the timing of the intake camshaft to be continuously varied throughout the engine's entire rpm range.
[DOC File]I borrowed this of the SUMMIT RACING site, I figured some ...
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At 5500-7000 RPM, the second VTEC solenoid engages (both solenoids now engaged) so that both intake valves are using a middle, third camshaft lobe. The third lobe is tuned for high-performance and provides peak power at the top end of the RPM range.
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