Do I cap this suited ace preflop?

[NobodysFreak]

and we'll get that heart about one in five times. We have an equity in this situation because we have a 1 in five chance of winning the pot and the bet on the turn only represents 1/12 of the pot. Its the same reason why we could pump the flush draw on the flop. Our equity in the situation hasn't decreased enough relative to the size of the pot.
On the flop we stood to win by the river about 1 in 3 times. On the turn, it's now about 1 in 5. The only difference is there's more money in the pot. If no one calls, we take it down UI. If everyone calls we still have a 1 in 5 chance of winning. Not to mention any bets we collect on the river.

Let me put it another way: Are you folding to a turn bet? Are you folding to a turn bet if you're potentially the only caller? If not, why aren't you betting?