Cosworth backs HRT, ‘working hard’ for Williams
The speculation was triggered by Bernie Ecclestone, when the F1 chief executive was quoted as suggesting the new Spanish team is in difficulties.
But Cosworth's Mark Gallagher said the general attitude about the sport's new teams is wrong.
"There has been something of a tendency to find fault or criticism with the new teams wherever possible and I think this criticism is quite unjust," he said on Monday.
Cosworth powers all of the three new teams in 2010, as well as Williams.
"From a Cosworth perspective all three new teams work hard and are good commercial as well as technical partners," Gallagher added.
"I think we are in a better position than most to comment on their condition and what we see is nothing but positive."
He also addressed reports that Williams, the only established team on Cosworth's books in 2010, has been disappointed with aspects of the engine so far.
"The engine has achieved or exceeded its targets but we have also seen some issues which we are working hard to resolve," said Gallagher.