I heard that HP is Tq x RPM Divided by 5252,

So a stock B18A1 which makes 121 tq (flywheel) at 6200 RPM has 142.8 HP,

If you were able to make peak tq at 7500
Say, for sake of example, no power gains were made through moving the peak torque, or adding the cams, you would be able to get 172 HP.


Now say, you have done a little work, and got an extra 10 lbs. tq, and got the peak tq to happen at 8000 rpms, you would have 199.54 HP!!!!!!!

Of course this is at the flywheel.


My question is this: How do you move the peak tq up the power band? Cams etc.?

Thanks,

 

you're wierd

 

I suck at math, but that sounds like a mathematical equation for camshafts to me.

 

I AM NOT WIERD!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

See, I am not sure what kind of tunning this would require. Some people that I have talked to said it is a combination of a lot of things, compression, cam profiles, stroke, etc.

If this has to do with cam profiles, then that would be why most people don't get 40 HP from cams. IF you did a profile that extreme the car would not idle at all, or would have to idle at like 2000 rpm's.

 

you can get 40whp from changing the system that creates
air speed velocity in your engine.

if you make peak efficiency in your engine at 6200 in a GSR
motor, then with some tuning to the manifolds by getting
a header, since we are talking about a B16, then an ITR mani
would help that as well as a 4-1 header. If you go with a setup
on your cams with more overlap at 0,0 then you will have
more overall power, to shift the tq higher, you could retard the
intake cam a degree or two maintaining 18BTDC on the ignition
timing... and retard the exhaust cam a degree or two. This
will make the engine see power later... not so much making more
later... you wont be faster.

cam tuning helps make more power where you want it,
fuel tuning insures that you make more power everwhere
once you find the best cam setting for overall power.
rememer... we still want MPG...

 

See, the B18A1 engine makes peak torque at like 5200 rpm, and peak hp at 6300 rpm. 6300rpm x 119 lbs. of torque / 5252 = 142 HP,

So, what would I have to do to make 120 lbs. of torque at say 7000? or 8000rpm?

Thanks

 

I have a old B18A1, and was able to achieve 140 WHP & 128 WTQ with 92-93 camshafts.

Due to rod length, stroke (crank), bore, head port size & angle, and intake manifold, the B18A1 naturally breaths its best from 4000-5000rpm.

Excluding the modifications of camshaft, intake & exhaust manifolding,

the real way of shifting the peak torque (peak breathing) to 8000rpm, would be to change the geometry (rod, crank, & bore). I think this might require a taller block (more deck height) ..and notching of the insides.

 

Interesting. Thanks for the help guys.