Sentences with phrase «cam lobes»

Forged steel crankshaft, forged steel connecting rods, aluminum pistons, powdered metal camshaft with sintered cam lobes

Usually, double overhead cams are used on engines with four or more valves per cylinder — a single camshaft simply can not fit enough cam lobes to actuate all of those valves.

As the engine load changes, electromagnetic actuators allow a movable shaft containing different cam lobes to shift imperceptibly between high - lift and low - lift profiles.

The four composite camshafts use net - sinter forged cam lobes on hollow shafts, with the inside of the shafts serving as oil passages.

In order to achieve the optimum volumetric efficiency in the lower portion of the engine's operating range, rocker arms are programmed to follow cam lobes that provide low lift and reduced duration (shorter time open with less valve lift).

Some SOHC multi-valve engines (such as the Mazda B8 - ME) use a single fork - shaped rocker arm to drive two valves (generally the exhaust valves) so that fewer cam lobes will be needed in order to reduce manufacturing costs.

Both engines feature continuously variable valve timing, modular engine design, microfinished crank journals and cam lobes, molybdenum coated lightweight pistons and electronically controlled throttles.

Using these inputs, the ECU is programmed to switch from the low lift to the high lift cam lobes when certain conditions are met.

The switching operation between the two cam lobes is controlled by the ECU which takes account of engine oil pressure, engine temperature, vehicle speed, engine speed and throttle position.

Most valves are opened by the cam lobes, and closed by springs.

It doesn't use direct injection, but the V - 6 does have a new version of iVTEC that can not only switch between high and low cam lobes, but on the rear bank of cylinders, can keep the valves closed completely.

I love BB creams and have been cam lobe profile catalog an expanded listing of all crane cams lobe profiles for professional racing engine builders

In the Fiat, the cam lobe drives a piston that creates pressure on the hydraulic fluid in the valve system.

Valve float is an adverse condition which can occur at high engine speeds when the poppet valves in an internal combustion engine valvetrain do not properly follow the closure phase of the cam lobe profile.

Valve float is bad because the valve gets a running start at the valve seat instead of being gently lowered on to the valve seat by the cam lobe.

If the engine is going fast enough, this time is longer than the time it takes for the cam lobe to rotate from «fully open'to «fully closed», so the valve doesn't follow the cam - a gap appears momentarily.

It also has the beauty of not caring about valve / cam lobe position.

If a cam is wiped out (cam lobe failure) or bearing journal failure, you can have the area rebuilt (welded) and ground down to spec again.

If you grind this area down, the lift from this portion to the top of the cam lobe becomes a larger distance, and thus you have more lift and more potential air flow going into the cylinder.

Theoretically the worn cam lobe can be reground to regain the lift.

Because of this, at low RPM, when VTEC is not engaged, one of the two intake valves is allowed to open only a very small amount due to the mild cam lobe, forcing most of the intake charge through the other open intake valve with the normal cam lobe.

When in VTEC, since the «normal» cam lobe has the same timing and lift as the intake cam lobes of the SOHC non-VTEC engines, both engines have identical performance in the upper powerband assuming everything else is the same.

In basic form, the single cam lobe and follower / rocker arm of a conventional engine is replaced with a locking multi-part rocker arm and two cam profiles: one optimized for low - RPM stability and fuel efficiency, and the other designed to maximize high - RPM power output.

This design allows for variable valve timing as well, since the cam lobe profiles can be made different.

This is because VTEC requires a third center rocker arm and cam lobe (for each intake and exhaust side), and, in the SOHC engine, the spark plugs are situated between the two exhaust rocker arms, leaving no room for the VTEC rocker arm.

At higher RPM, both intake valves run off the larger intake cam lobe, improving total air flow and top - end power.

Multi-valve engines tend to have smaller valves that have lower reciprocating mass, which can reduce wear on each cam lobe, and allow more power from higher RPM without the danger of valve bounce.

The camshafts on some Ferrari engines are cut with a three - dimensional profile that varies along the length of the cam lobe.

At one end of the cam lobe is the least aggressive cam profile, and at the other end is the most aggressive.

The 6G73 is a 24 - valve SOHC design with two valves running off a single cam lobe on the exhaust valves using a forked rocker arm and each intake valve actuated with two cam lobes, with a smaller bore than the 3.0 liter version of the same block.

The cam lobe profile selected for engine speeds below 3000 rpm has a duration of 214 degrees and lifts the valves 5.5 mm.

For high - speed driving, CPS switches to a cam lobe with a duration of 250 degrees and valve - lift of 10.5 mm, allowing greater air flow into the engine for high power.

When the ejector pin is retracted, there is nothing to hold the cam unit in this new position any more, so it will glide back to its original position to resume valve lift via the smaller cam lobe.

As a result, both intake valves follow a central high - lift, longer - duration cam lobe.

Not exact matches

It turns out that the lobe on the intake cam was worn funny.

The previous LS versions have extensive aftermarket support where builders talk head airflow statistics, rod ratios (connecting rod divided by stroke), cam durations, lift and lobe separation and inductions schemes.

The economy i - VTEC used in K20A3 / K24A4 engines is more like the SOHC VTEC - E in that the intake cam has only two lobes, one very small and one larger, as well as no VTEC on the exhaust cam.

Also, you will want to use a cam specific lube on the camshaft where the lobes intercept ride on the lifters (or whatever they are called... the caps on top of the valves which the lobes ride on).

• Two - lobe overhead cam and a pair of needle - roller rocker arms reduce friction by 50 percent for increased fuel efficiency and torque.

Gen V Cams feature four different lobe profiles to both create AFM compatibility and optimize intake and exhaust valve opening / closing events.

Cam kits include 2 intake and 2 exhaust camshafts and optional 30 % overdrive fuel lobe for E85 and higher boost pressures.