Strosek Ultra
Just got it firing!
- Joined
- Jul 13, 2012
- Messages
- 7
Have just finished a 1105cc race engine based on a LeMans IV for a customer. Thought you guys are interested in how much air flow can be attained from a D-shaped intake port having a 50mm valve still keeping the air velocity up.
Valve lift 2,5 mm flow 65,8 CFM at 28"
5,0 131,5
7,5 199,8
10,0 247,1
12,5 277,6
15,0 290,8
17,5 296,2
For those who does not know, there is a pretty accurate formula to calculate engine power from the flow at maximum valve lift. Flow x 0,257 = horsepower.
The small 22mm lifters does not allow more than up to 12mm of valve lift. From the flow figures you can see more lift would benefit more power.
Question: Has anyone tried mushroom lifters of larger diameter able to run a camshaft giving more lift, up to 15mm? Like to share your experience.
Åke Jonsson
Valve lift 2,5 mm flow 65,8 CFM at 28"
5,0 131,5
7,5 199,8
10,0 247,1
12,5 277,6
15,0 290,8
17,5 296,2
For those who does not know, there is a pretty accurate formula to calculate engine power from the flow at maximum valve lift. Flow x 0,257 = horsepower.
The small 22mm lifters does not allow more than up to 12mm of valve lift. From the flow figures you can see more lift would benefit more power.
Question: Has anyone tried mushroom lifters of larger diameter able to run a camshaft giving more lift, up to 15mm? Like to share your experience.
Åke Jonsson