Bicycle Mechanics - Stuck seatpost advice

Quite awhile ago (6 yrs??) I got my old Trek 930. Back then I wasn't extremly into biking as I am now, and also didn't take great care of my bike. But in the past few years, I've really caught the bug, and also started actually paying attention to the upkeep of my bike.
But in the years of neglect one major issue has come up: the aluminium seatpost has fused to the steel frame. Last time I tore my bike down, I shoot some PB Blaster into the frame then tried brute force the next afternoon. Of course this didn't do a thing.
So, I'm going to be home from college in a few weeks and I am planning on tearing down my bike for a good spring cleaning before my summe rideing starts and I was wondering if anybody has had a similar problem in the past and/or suggestions on how I might be able to get the seatpost out.

PS: I could care less about the seatpost itself, but obviously I'd like to avoid as much damage to the frame as possible.

Maybe you can try heating it up with a propane torch after spraying the joint with some tri-flow. We do this on aircraft engines when we have frozen bolts that won't come out and we don't want to strip the head or threads. The propane burns very cleanly, so you won't have much carbon residue after heating. Make sure you wait a few mins after applying the tri-flow.

Try this thread http://www.bikeforums.net/showthread.php?s=&threadid=15098&highlight=siezed
There are some helpful hints, have you resorted to brute force and WD-40? I'm also thinking that if you remove your BB, you can hang the bike up side down, and fill the seat tube with WD-40, Ive used something called Zep-45, works well with corroded aluminum.

Good luck!!

That other thread makes it sound pretty hopeless for non-destructive techniques. It's hard to believe that there was no grease on the post. The heat suggestion might be worth a shot, but I'd try something like a towel dipped in boiling water, rather than a blowtorch. Maybe a hot towel on the frame, and a cold towel on the post. Good luck.

Thanks for the advice (and the link to the old post =] )
My plan of attack right now: start off soaking it all with something overnite, go with some more brute force, then using the hot/cold towle method, then if that doesn't work moving to the torch and seeing how that works.
I figure I'd start with the least destructive method and work my way up.
Anyways, thanks again for the advice. I'll post a reply here once I get home and have a chance to give it a shot.

Heating the frame/post will do no good as the aluminum post will expand twice as fast as the steel frame. I would locate some penetrating oil, an old saddle, and a big rubber mallot. Spray the penetrating oil into the seattube several times throughout a day, in the afternoon of that day mount the old saddle to the post and go after it with the mallot. Strike the saddle on the side forcing it to rotate and hopefully this will allow you to work it loose with some effort. Sometimes some ammonia can help to break the bond if it is an aluminum oxidation problem but I will bet it is rust in this case so go for the penetrating oil. You could clamp the post head in a vice and rotate the frame to try to loosen it. If none of these work then use a small hacksaw and cut the top off the post, then cut a slit down the length of the post being careful not to cut the frame and once you have the post split all the way down then use a big pair of channel lock pliers and roll the post up into itself and remove it. Most lbs's will also do seatpost extractions for some cash money but I think you can probably get it out yourself.

-Ryan

Good point, BikerRyan! How could I have missed that?? ;) Yeah, forget the torch, it prolly won't do any good because of the different expansion rates.

Post pics for before and after!

Try going here: 15 Ways To Unstick a Seatpost (http://www.sheldonbrown.com/stuck_seatposts.html)