288/280 Cam Compression

[x Spades x]

Hey Fellas,

So I bought a motor that was said to have 190psi (stock cams). I put 288/280 cams in and now the psi is pictured.
I'm surprised as the variance is HUGE.

What are the compressions you guys are seeing with 288/280 cams?
Are you guys seeing 360whp with supported mods (SSV1 2.5 system, CF airbox, etc)?

Thanks,
Kareem

[George Hill]

Lots of things affect cranking compression especially if you are comparing your results to someone else's:

• Battery voltage
• Engine Temp
• Was the throttle WOT?
• Flywheel weight
• ETC

[CrisSilberGrau]

My compression before 280/272 cold engine
Cylinder:

1. 162psi
2. 169psi
3. 170psi
4. 165psi
5. 173psi
6. 172psi

With cams obviously static compression drops all things remaining equal. I think after cams your stated compression is quite good. Pistons will claw back a lot of whats lost and more imo. In the dyno sticky I think BBR tuning did a very comprehensive test with new pistons and rods and noted some interesting things.

With CSL, ssv1, and 280/272 and stock injector mine made 348whp on dynojet (engine @151k miles).

[ethan]

288/280 Cat Cams, Mahle Powerpak 87.5mm pistons, Rogue steel LWFW. Amateur-built engine - no promises...

cold
1: 155
2: 157
3: 168
4: 154
5: 162
6: 166

hot
1: 154
2: 154
3: 156
4: 154
5: 155
6: 153

[nuc1]

288/280 Cat Cams, Mahle Powerpak 87.5mm pistons, Rogue steel LWFW. Amateur-built engine - no promises...

cold
1: 155
2: 157
3: 168
4: 154
5: 162
6: 166

hot
1: 154
2: 154
3: 156
4: 154
5: 155
6: 153

These are about the same as my car w/ 288/280 cams.

Mike