Racking to secondary while krausen is still on top

Is this a bad idea? I want to move my 4 day old IPA (OG 1052) to the secondary, but a huge krausen is still on top. Should I wait until it recedes?

Why would you want to do that? A huge krausen on top means fermentation is still quite active. Moving it now will likely negate most of the benefits of using a secondary. IMHO I'd recommend you leave it alone.

Wait. Why would you want to rack it now? Give it at least a week as there should be little to no gravity drop in a secondary. All fermentation should take place in the primary otherwise you'll just end up with unnecessary trub in the secondary.

yeah, i guess you're right. i just wanted to get a head start on clarifying the beer, plus i need the carboy space

leave the beer alone, buy another carboy

Can't worry about clarifying until it's done fermenting. Besides... it'll clarify just as quick in primary as it will in secondary. Many folks here don't even use a secondary and just leave it in primary for 3 weeks or so and then bottle/keg it. I still secondary most of my beers for a week or so, but after a long primary they're already pretty much clear. It lets me get every bit of beer out of the primary since I know that any yeast cake I suck up in the process will settle out into a much thinner layer after a week in secondary. I really hate to waste beer.