Am I setting myself up for failure or injury.

I have been an avid cyclist for 4 years now, both mountain and rode.  Aside from the usual group rides and family outings, I have completed several endurance type rides over the past couple of years.  Rides like RAGBRAI (2008 & 2009), Moab Skinny Tire Festival & Moonshadows, Granfondo San Diego Century and Copper Triangle (2010).

I decided to make 2010 the year of the marathon.  January and February consisted of running thoughts and visions only.  In March, after Granfondo San Diego, I got serious on my training for the San Diego Rock and Roll Marathon.  I thought I trained hard enough for a sub 4.5 finish time, but it wasn't enough, finishing 5:23:23.  About two hours after the race, I decided to shoot for a sub 4.5 marathon at the Denver Rock & Roll Marathon in October.  The good news is that I have shed almost 40 pounds since March (was 227, now 189 lbs.).  My bike thanks me every ride   I will finish the Denver marathon in under 4:30!

Sometime between June and now, I got the crazy idea to give triathlons a shot.  I have never been one to go small, go big or go home, right?  So I have registered for an Olympic distance tri that is 6 weeks away.  As of today (8/9/2010) my running consists of three 7 mile runs a week and two, sometimes three, 25-45 mile rides with ~2000 feet of climb a week.  You notice swims are not in that weekly workout agenda?

Is it feasible to think that adding two, 45 minute swim sessions in a pool 2X a week for the next 5 weeks will have me ready to finish an Olympic tri?

Any advice or suggestions is welcomed and will be greatly appreciated.  Thanks.