Hi comp pistons

canes7

So lets look at things a bit differently. Power (HP) is a calculation of torque X RPM / 5252. As I understand it higher compression ratios move the torque curve up on the RPM scale, not necessarily making more torque but more HP just by calculation. The VQ37 engine already makes it's peak power @ 7000 rpm.

So how fast do you want to spin this engine??? I come from the old school so 7k seems like a lot to me already. Can these engines handle 7k or 8k regularly?

phunk

Higher compression has nothing to do with RPM.

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canes7

Please elaborate.

Chuck33079

My guess would be that the static compression ratio is the same whether the car is idling at 750 rpm or at redline.

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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

canes7

All the articles I can find quickly focus specifically on how efficiency is increased by upping the CR. I was referring to CR's effect on the torque curve. If I find something I'll post it.

synolimit

I'm no expert but compression is power, it has nothing to do with rpm. If you cram air and fuel into a space and ignite it, it goes boom. If you cram the same amount into a smaller space (more compression) you get a bigger boom. The more faster bigger booms you get from 2-7k, the more power you make. Hp is basically just a guess calculation from how fast you can get a drum to spin from beginning to end in xxx amount of time. TQ obviously is a measure of the force on that drum.

Now with degreeing the cams, cam tuning/timing, ignition maps etc, you can put the added power where you kinda want it. My race bike for example made about 12 hp from a thinner head gasket. That power started in the mid range from 6-10k. But since you're never really that low, we degreed the cams and moved it above 10k where it was needed more.

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13 370z-