The 19-time Isle of Man TT winner took up the opportunity to fill in for injured American rider Brandon Paasch in the British Supersport class.
Dunlop, who misses this weekend’s Cookstown 100 road races as a result, is now the sole rider in the team after Kyle Smith crashed on Friday afternoon, fracturing his pelvis.
He was 15th on the combined time sheets on Friday and the Ballymoney man says he spent the first day at Silverstone adapting to the characteristics of the three-cylinder machine.
“First day out on the Dynavolt Triumph,” said Dunlop.
“It’s been tricky, this morning was wet, trying to learn a brand new motorbike but the second session we got a dry run and we started to learn what the bike is starting to do.
“It’s been hard trying to adapt from the four to the three cylinder but we’re getting there and the team are working hard.
“It’s a great opportunity, just hopefully work harder tomorrow.”
The Dynavolt Triumph team is run by Simon Buckmaster’s PTR outfit. Dunlop previously worked with Buckmaster at the Isle of Man TT, enjoying success on the PTR-prepared Honda in the Supersport class in 2013.
The British Supersport Sprint race on Saturday at Silverstone is scheduled for 5pm with the Feature race on Sunday at 3.40pm.