Report Engine does not increase when there is a large no of reports queue

Hello Everybody,
Specifications:
Product : Oracle Application Server Forms and Reports Services 10.1.2.0.2
OS : Windows 2003 R2 Server
Dual Core CPU 2600MHz
6 GB RAM
We are doing the sizing for our reports server. We have specified the following in our rep_server.conf
<engine id="rwEng" class="oracle.reports.engine.EngineImpl" initEngine="2" maxEngine="6" minEngine="2" engLife="50" maxIdle="30" callbackTimeOut="90000" engineResponseTimeOut="3" jvmoptions="-Xms64m -Xmx128m">
Even when there are 5000 or more reports in the queue still the number of engines in the reports server remains at 2 though I have given that it can use upto a maximum of 6 engines. Can anybody please explain why this happens? Am I missing something here?
Thank you for your reply in advance.

Hello,
Anybody has any idea why the report engine is behaving like this?
Thanks in advance

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