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Discussion Starter #1
Was "playing around" with a Engine simulator. I've created a model of a B202 T16 and did some Iterations.

I was looking for a Cam which gave the most power (HP) between 2000-8500 rpm. nothing else than IVO,IVC,EVO and EVC were changed, lift were the same(8.65mm). All other engine parameters were static.

After some 200000+ iterations...

I got the following info:
IVO: 14
IVC: 87
EVO: 90
EVC: 32
Lobe center: 122.8
Valve overlap: 46
intake duration: 281
Exhaust duration: 302

This cam in comperasion wit the stock gave:
RPM, HP(New), HP(Stock)
2000, 39, 56
2500, 55, 73
3000, 71, 91
3500, 86, 108
4000, 103, 125
4500, 123, 140
5000, 143, 152
5500, 162, 162
6000, 178, 167
6500, 193, 169
7000, 203, 166
7500, 215, 165
8000, 217, 157
8500, 221, 147

Question:
I now wondering if there's someone out there with specifications of other "hot" cams to B202 T16, for comperasions and for other relative values in the computer model?
 

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Discussion Starter #4
Checked around...

Got hold of the following info:
SD Red series
intake Lift:9.37
IVO: 22
IVC: 61
exhaust Lift: 8.65
EVO: 56
EVC: 16

Catcams
Hydraulic tappet
sport 1
intake Lift:9.55
IVO: 12
IVC: 56
exhaust Lift: 9.55
EVO: 56
EVC: 12

sport 2
intake Lift:9.75
IVO: 23
IVC: 67
exhaust Lift: 9.75
EVO: 67
EVC: 23

rally
intake Lift:10.95
IVO: 28
IVC: 64
exhaust Lift: 10.9
EVO: 58
EVC: 22


Mechanic tappet
hi/po 3 TURBO
intake Lift:11.3
IVO: 18
IVC: 58
exhaust Lift: 11.3
EVO: 58
EVC: 18

hi/po 4 RACE
intake Lift:12.5
IVO: 39
IVC: 69
exhaust Lift: 11.95
EVO: 65
EVC: 35

Simulations
RPM, HP(original), crower sport1, crower sport2, crower rally
2000, 56, 56, 49, 50,
2500, 73, 74, 66, 67,
3000, 91, 92, 84, 85,
3500, 108, 109, 103, 104,
4000, 125, 124, 122, 122,
4500, 140, 140, 141, 140,
5000, 152, 153, 158, 158,
5500, 162, 162, 172, 172,
6000, 167, 168, 185, 184,
6500, 169, 170, 193, 193,
7000, 166, 167, 198, 197,
7500, 165, 165, 201, 199,
8000, 157, 157, 200, 197,
8500, 147, 147, 196, 195

Mechanic tappets
RPM, HP(original), Crower turbo, Crower Race
2000, 58, 57, 41
2500, 76, 75, 59
3000, 95, 95, 76
3500, 113, 114, 95
4000, 131, 132, 116
4500, 147, 150, 137
5000, 160, 167, 158
5500, 171, 181, 174
6000, 176, 192, 191
6500, 179, 200, 203
7000, 176, 202, 212
7500, 176, 201, 225
8000, 168, 197, 226
8500, 158, 193, 228
9000, - - -, - - -, 227
 

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Hi widde, welcome to the board.
I've no experience in upgraded cams, but I can see that the cams you've virtually designed are useful only above 5500rpm, and still mantain the power up to 8500. I wonder if a real engine could bear all those rpm. I'm afraid of a bent valve, or a broken rod.
You played with a turbo engine model, right? did you used the stock boost? raising the boost is the best way to go to upgrade these engines, and developing models without considering boost among variables isn't that smart.
I don't want to say your work isn't useful, actually it is and I'm very fascinated by the results you got. Interesting how the simulation on the real engine is so close to the real values of power, this means that the software you used is good and that you used it very well.
What about torque? timing affect engine efficencies and torque in the first place, so I would be more interested to see the torque curve than the power one.

What software do you use? who does it? is it hard to use it? I'm interested because I study mechanichal engineering and I saw Wave, but I don't know if it can be so precise about power.

Once again, I'm very impressed with your work.
 

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Discussion Starter #6
>>stefano

About the cams:
The first cam spec is of my design, But does it work? I think that cam is alittle bit too extreme.. It "pulls" to over 10K+
the others are Real cams specs from Catcams and I did simulations from these specs. These cams are avaible for anyone to buy.

The model are almost correct. I couldn't get the real turbo specs so I used a predefined that were really close. Little higher boost pressure than stock to get the stock engine setup to match the original specs.

Currrently I'm using a friends software (I use his computer so there's no licence violations.) The software is the old version of Dyno2000. I'm planning to buy the new version Dyno2003 anytime now. visit http://www.motionsoftware.com they got a demo of the new version. The software is simple to use and they got an excellent guide how to use it.

I'll up the torque maps tonight.

But to really rev higher you need to rebuild the cylinderhead:
- port the head
- exchange the valveseats
- exchange to harder springs and/or use dual springs
- exchange the valve guides
- exchange the hydralic tappets to solid ones (use "shims" to set the correct hight)
- exchange the cam to a hotter that revs higher
 

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Discussion Starter #7
Simulations
RPM, ft-lbs(original), crower sport1, crower sport2, crower rally
2000, 146, 148, 127, 130,
2500, 153, 155, 139, 140,
3000, 160, 161, 147, 149,
3500, 162, 163, 154, 156,
4000, 164, 163, 160, 160,
4500, 164, 163, 164, 164,
5000, 160, 160, 166, 165,
5500, 155, 155, 164, 164,
6000, 146, 147, 162, 161,
6500, 137, 138, 156, 156,
7000, 124, 125, 149, 148,
7500, 115, 116, 141, 139,
8000, 103, 103, 132, 129,
8500, 91, 90, 121, 121,

mechanical on its way
 
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