Toyota's Jarno Trulli managed just 26 laps, but set the best time on the 5.255km circuit in one minute 31.360 seconds.

Afterwards, he said: "With the first two days of this week's test devoted to Monaco preparations, we had scheduled an intensive programme today.

"Montreal is a very different type of circuit and we wanted to try out different aerodynamic and mechanical solutions.

"You run less downforce in Montreal compared to Monaco, so the car set-up is very different and we had planned a lot of work on this.

"So it was frustrating the rain came early in the day and meant we could not collect any dry data."

After 191 laps on the shorter version of the circuit yesterday, Nelson Piquet managed 60 laps in his Renault and was second quickest, just over a quarter of a second down on Trulli.

McLaren test driver Pedro de la Rosa was third, within 0.8secs of Trulli, followed by Sebastian Vettel in the new Toro Rosso.

Felipe Massa was fifth fastest in his Ferrari, with Nick Heidfeld sixth for BMW Sauber, Red Bull tester Sebasien Buemi seventh and Giancarlo Fisichella eighth in his Force India.

Jenson Button was ninth for Honda, followed by Force India's Adrian Sutil who managed the least number of laps with 13, with Williams test driver Nico Hulkenberg bringing up the rear.

Friday's times:

1 J. Trulli Toyota 01:31.360 26 laps
2 N. Piquet jr. Renault 01:31.634 60 laps
3 P. de la Rosa McLaren 01:32.143 53 laps
4 S. Vettel Scuderia Toro Rosso 01:32.480 49 laps
5 F. Massa Ferrari 01:33.246 19 laps
6 N. Heidfeld BMW 01:33.371 30 laps
7 S. Buemi Red Bull 01:34.064 16 laps
8 G. Fisichella Force India F1 01:34.071 31 laps
9 J. Button Honda 01:36.501 19 laps
10 A. Sutil Force India F1 01:43.877 13 laps
11 N. Hulkenberg Williams 01:44.741 35 laps