MBP fans @ 6000 rmp when charging

The fans of my 2yr old mac have been going nuts lately (high 5000s/6000s rpm) so after looking into it with iStats I was led to change the battery (last one was health @36% w 157 cycles). Things are now great in terms of not having to keep the laptop plugged 24/7 but the fans still accelerate.
Both fans hover at about 6000 rpm when the cpu is plugged and yes, it does get a very hot on the bottom (laptop kept on solid desk surface only). It doesn't matter what I am running or not running on it at that time. If not plugged- mid 3500s. As soon as I plug it in- bam 6000 rpms, when I unplug back down to the 3000s rpm... the number of programs is irrelevant, and according to the application monitor nothing is "stealing" power so to speak.
I use the laptop a lot and have no other problems with it, but I do need to plug it - I am on it at about 8 hrs a day easily and with a new schedule on the way I plan on being on it even longer. Runs smoothly. I am just worried because I read somewhere that if it fans get over 6500rmp it supposedly would crash. The noise is not pleasant, I am used to my silent mac, but I'll buy earplugs if I have to so long as I don't have to part with it.
What is going? Please, please help.
iStat temps:
HD: 40
CPU: 63
Airport card 57
Enclosure base 38
CPU Diode 61
CPU headsink 63
Headsink A 50
Headsink B 43
Fans
Left fan 6003 rpm
Right Fan 5994 rpm
Hardware Overview:
Model Name: MacBook Pro
Model Identifier: MacBookPro3,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 2 GB
Bus Speed: 800 MHz
Boot ROM Version: MBP31.0070.B07
SMC Version (system): 1.16f11
Battery Information:
Model Information:
Serial Number: SMP-ASMB012-3b90-284
Manufacturer: SMP
Device name: ASMB012
Pack Lot Code: 0002
PCB Lot Code: 0000
Firmware Version: 0110
Hardware Revision: 0500
Cell Revision: 0200
Charge Information:
Charge remaining (mAh): 1988
Fully charged: No
Charging: Yes
Full charge capacity (mAh): 5373
Health Information:
Cycle count: 2
Condition: Good
Battery Installed: Yes
Amperage (mA): 2946
Voltage (mV): 11962
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 180
Disk Sleep Timer (Minutes): 180
Display Sleep Timer (Minutes): 180
Automatic Restart On Power Loss: No
Wake On AC Change: No
Wake On Clamshell Open: Yes
Wake On LAN: Yes
Display Sleep Uses Dim: No
Battery Power:
System Sleep Timer (Minutes): 3
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 3
Wake On AC Change: No
Wake On Clamshell Open: Yes
Display Sleep Uses Dim: Yes
Reduce Brightness: Yes
Hardware Configuration:
UPS Installed: No
AC Charger Information:
Connected: Yes
Charging: Yes

Start with both fans at 6000 rpm
1) Resetting the System Management Controller (SMC)
- rmp down to 4000
2) Activity monitor. Select All processes- Quit PrintJobMan
- rpm down to 2000
VICTORY!

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