Good Cam for 318

YY1 said

I really wish those small displacement, small-ish cam dyno tests would start MUCH lower in the RPM range....

...because that's where people drive.

Obviously they had the capacity to show 2000 RPM numbers but for some reason, chose not to.

You can't "assume" the numbers below 3K were also higher.

If it were my car, I'd want off idle numbers.

Especially for a cam upgrade with an advertised power band starting at "idle" or "1500".

That's kinda the whole point of "data".

Click to expand...

Mainly because in a full throttle run aka drag, 0-60 etc... lowest rpm don't matter much even with stock gearing and stall you don't spend much time down there.

And as for normal driving does a full throttle run on a dyno show us anything? I know Richard Holdener did a half throttle dyno pull and it made about 75% the hp and curve was similar to full throttle so it may.

But also at normal driving your hp requirement is so low something like 1-30hp even a /6 makes more than needed. And a engines torque is based on engine size and it's hard not to fill the cylinders decently at low rpm so there's floor to how low it can go, but another problem is hp % of torque is smaller at low rpm, 19% @ a 1000 rpm, 38% @ 2000 rpm etc..

I think additional to dyno runs there needs to be more road test how carbs, cams, stall, gearing effects driving, drivability etc..