Ok, So I was looking at the Mongoose 272 from NR racing. How does this cam look, would it kill any low end? Given it has more info than the others like ICL, ECL, and lobe separation.
| Lift | | .272" |
| Duration @ .50 | 245 | |
| ICL | | 106.5 |
| ECL | | 117 |
| Lobe Separation | 112 | |
| Specs | Intake | Exhaust | | |
| 0.050" | 18 | btdc | 239 | btdc |
| 0.100" | 2 | btdc | 213 | btdc |
| 0.150" | 16 | atdc | 206 | btdc |
| 0.200" | 38 | atdc | 185 | btdc |
| 0.250" | 66 | atdc | 155.5 | btdc |
| Max Lift | .275" | | .275" | |
| 0.250" | 147 | atdc | 78 | btdc |
| 0.200" | 175 | atdc | 49 | btdc |
| 0.150" | 196 | atdc | 28 | btdc |
| 0.100" | 213 | atdc | 11 | btdc |
| 0.050" | 229 | atdc | 5 | atdc |
IMHO, it's not a good cam for a daily driver that needs power to come in sooner.
It does have a very good name, thats the only
I'll give it.
It's alot like the other cam you posted, it's gonna be lazy off the line, gonna need big CR, a bunch of stall, low gearing, and small tires.
The duration at .050", and lift, is very close to the isky black mamba senior, but there's no way its gonna compare with the BM senior, the LSA is too wide to make good usable power in the low and mid range.
Even tho the cam has 5.5* advance built in it, it's still gonna give up alot til it gets to higher rpm.
Jus looking at those numbers, I'd have to say the isky BM senior will close the intake valve 10* - 15* sooner, making power, (torq to the tires) happen much earlier in the rpm.
The isky BMJ cam jus works, as
@bob58o mentioned, its works great!!!!!
ive never pushed it passed 10.5:1 CR, but anything under 10.1 CR will safey run and last a very long time with 28*-30* of ignition timing, running on cheap 87 octane.
If you start creeping above the 10:1 CR with the BMJ, you will have to back the timing down, or find more octane fuel to be on the safe side of longevity.
Good luck, keep learning.
