Just wondering when you add a cam to a atv. Dos it change the idle on it. Like in cars it makes it lope alittle. Never heard an atv with a cam in it didnt know how it would sound or the increase in power. I am putting a stage 2 hotcam in my raptor 700r

 

I been tuning warriors and raptor 350s and I'm above average rider, I like woods running, mx and flat track racing, I like the stock cam on the raptor 350, it has a good wide powerband it pulls strong from idle to 7000 rpm and Ive tried different cams and don't like them it just raises and narrows the power band, heres a good read about cams
"The most important cam timing event is the intake valve closing angle. The intake closing point determines the minimum rpm at which the engine begins to do its best work. The later the intake valves close, the higher the rpm must be before the engine gets "on the cam."

Long duration, late closing cam designs are necessary to drag the last bit of power out of an engine. Unfortunately, these same cams can perform poorly under more normal riding conditions. In the quest for maximum power output, many-too-many Harley owners choose a late closing, high-rpm cam for their engine. The problem with such choices is that the engine seldom spends time in the rpm range favored by such cams.

The majority of virtually any Harley motor's life is spent in the mid-portion of its rpm limits, between 2000 and 4000 rpm. At open-road cruising speeds, that range is more like 2500 to 3500 rpm. With current Big Twin gearing, top gear at 2500 rpm returns a road speed of 55 mph and 3500 delivers 84 mph. Riders sometimes "putt" around at 2000 or less. Even when accelerating to cruising speed, few of us use more than 4000 - 4500 rpm as a shift point. Very seldom, in day-to-day use, do our engines get near 5000 rpm, let alone 6000.

Even the mildest of Harley-Davidson's aftermarket cams (Evo or Twin Cam) do their best work above 3000 rpm. At 2000, the majority of these cams seldom perform significantly better than stock cam(s).

The rpm at which a Big Twin gets "happy" can be predicted by the closing point (angle) of the intake valves. The angle is expressed as the number of degrees After Bottom Dead Center (ABDC) that the valves reach .053" from being fully seated.

The following list predicts the rpm at which the engine gets "on the cam" based on the closing angle of the intake valves. These relationships are approximate but should hold true to within 200 rpm or so. They also assume that all other tuning factors, exhaust, ignition, etc., are operating correctly.


30 degrees = 2400 rpm

35 degrees = 3000 rpm

40 degrees = 3600 rpm

45 degrees = 4000 rpm

50+ degrees = 4500 rpm



If you have one of the late closing cam designs installed, say one that closes the intake valves later than 40 degrees, then you cannot expect excellent performance at 2000 rpm. No carburetor adjustment, ignition adjustment or exhaust system can change this."

 

An ATV cam does not lope like a cam in a car. I have never really been able to tell a difference in sound with a cam installed.

 

that cam should get you 3 peak hp and give you alot more top end hp

what other mods do you have?

 

The cam I put in mine gave a really nice boost to the mid range and top end.