torque curve v bhp curve

[alladdin]

pinto,
ported head , unknown not too hot cam , 32/36 dgav,

owner says that on the RR the torque curve was always higher than the bhp curve ?

[Graham]

pinto,
ported head , unknown not too hot cam , 32/36 dgav,

owner says that on the RR the torque curve was always higher than the bhp curve ?

torque curve will be higher than bhp, if the cam is mild or the engine is restricted on the induction side of things

how it looks on the graph depends on how you scale it, but assuming matching scales a standard pinto makes more torque than bhp so the torque curbe would be higher, its only when you have pushed power to 150bhp you will get more power than torque

[FrankC]

As in an fr30 or similar “high torque” cam. Around 130bhp but presumably a higher torque rating…
Any idea what torque these cams roughly achieve Graham ?

[Graham]

As in an fr30 or similar “high torque” cam. Around 130bhp but presumably a higher torque rating…
Any idea what torque these cams roughly achieve Graham ?

the high torque cams dont necessarily make more torque than any other, they just tend to deliver it low in the rev range.

induction will make a difference even the high torque cams will make more torque on DCOEs than a 32/36.

typical torque id say is probably in the 140-150lbft range

[FrankC]

Good to know

[snapper1]

If both the torque and bhp scales are the same using Ft/Lbs for torque and bhp for power then the torque curve and bhp curve cross at 5252rpm.

Brake horsepower is derived from a calculation that relies on torque:

BHP = Torque x RPM/5252.

Defined simply, multiply the torque by the axis’s rotational speed per minute (rpm) and you’ll get the engine’s final power output.

[katana]

the high torque cams dont necessarily make more torque than any other, they just tend to deliver it low in the rev range.

induction will make a difference even the high torque cams will make more torque on DCOEs than a 32/36.

typical torque id say is probably in the 140-150lbft range

Understandable as torque is a function of airflow / engine breathing! A big capacity engine will make more torque than a small one, a bigger carb increases breathing so helping torque,
a turbo being essentially an air pump, will increase torque exponentially. Torque gets you from A - B quicker, HP just does it with better MPH!

[alladdin]

If both the torque and bhp scales are the same using Ft/Lbs for torque and bhp for power then the torque curve and bhp curve cross at 5252rpm.

that was the bit i was expecting - the crossover , although he doesnt have the graph.
the engine made low 130 which seemed low to me. ( cam profile unknown by anderson)

[snapper1]

I think a 32/36 is good for about 140bhp so that may be the restriction but without knowing anything about the cam, compression ratio or how the porting was done who knows what the bhp should be

[Graham]

that was the bit i was expecting - the crossover , although he doesnt have the graph.
the engine made low 130 which seemed low to me. ( cam profile unknown by anderson)

mild engine unknown spec low 130's isnt unrealistic

[Graham]

I think a 32/36 is good for about 140bhp so that may be the restriction but without knowing anything about the cam, compression ratio or how the porting was done who knows what the bhp should be

32/36 can even be made to give more, but at ANY engine spec DCOE will give more, so if you can get 140 on a 32/36 your probably have 150 or more on DCOE