A man and a woman who lured a man into a car park where he and a friend were doused in petrol and set alight in a "sinister" attack have been jailed.
Michael Brinias suffered severe burns that took years to heal after his former partner Kerry Ross and her then boyfriend and now husband Ben Woodhart enticed him and his friend into a car park in Adelaide's north in 2013 over a promise to buy drugs.
Ross and Woodhart, both 29, were found guilty of causing aggravated serious harm over the attack that was carried out by two hooded figures who have never been found.
In the South Australian District Court on Monday, Woodhart was jailed for at least eight years and eight months and Ross was jailed for at least four years and three months.
Judge Rauf Soulio said it was difficult to understand the process of reasoning that led to such offending.
He said the attack was not spontaneous or opportunistic nor was it committed in a fit of anger.
The offending was carefully planned and carried out in a calculated manner while the use of fire added a sinister element, the judge said.
Mr Brinias suffered third degree burns to 15 per cent of his body, including his face and hands, and was placed in an induced coma in intensive care.
His friend also suffered serious injuries.