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Old 06-07-2004, 02:54 AM
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F1 car bore/stroke?

Why do F1 cars have 2:1 bore:stroke? Why not a 3:1 bore:stroke? Is it just the average horsepower will be less due to the loss of area underneath the torque curve? Will the gain in revs not be worth it?
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Old 06-07-2004, 07:27 AM
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Quote:
Originally Posted by Mr Payne
Why do F1 cars have 2:1 bore:stroke? Why not a 3:1 bore:stroke? Is it just the average horsepower will be less due to the loss of area underneath the torque curve? Will the gain in revs not be worth it?
In 2000 the Ferrari F1 motor had a bore of 96mm and a stroke of 41.1mm giving a bore to stroke ratio of 2.31:1

Now if we take a look each cyl we can see at 18,000 RPM the piston moves up and down 300 times second!!! and each valve is opening and closing 150 times a second!!! Now go and figure the time it takes for each of the 4 cycles of a 4 stroke engine to take place at this RPM.

If we shorten the stroke and increase the bore for a 3:1 ratio IE a 105mm bore and a 34.5mm stroke could increase the maximum RPM and cause a reduction in torque. The biggest problem would be the fact that the engine would now more than likely have to go to 2 spark plugs to ignite to fuel air charge and the extra spark plug may cause problems with cam shaft support areas, Combustion chamber + Piston design, and port shapes.

The trade offs versus the increase in width of the engine and lowering of the CG of the engine just dont work. As with anything mechanical in nature. there are trade offs that have to be made in order for the project to go ahead.. Including a F1 race car and motor.

Beast
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Old 06-07-2004, 07:33 AM
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Join Date: May 2003
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Quote:
Originally Posted by Mr Payne
Why do F1 cars have 2:1 bore:stroke? Why not a 3:1 bore:stroke? Is it just the average horsepower will be less due to the loss of area underneath the torque curve? Will the gain in revs not be worth it?
In 2000 the Ferrari F1 motor had a bore of 96mm and a stroke of 41.1mm giving a bore to stroke ratio of 2.31:1

Now if we take a look each cyl we can see at 18,000 RPM the piston moves up and down 300 times second!!! and each valve is opening and closing 150 times a second!!! Now go and figure the time it takes for each of the 4 cycles of a 4 stroke engine to take place at this RPM.

If we shorten the stroke and increase the bore for a 3:1 ratio IE a 105mm bore and a 34.5mm stroke could increase the maximum RPM and cause a reduction in torque. The biggest problem would be the fact that the engine would now more than likely have to go to 2 spark plugs to ignite to fuel air charge and the extra spark plug may cause problems with cam shaft support areas, Combustion chamber + Piston design, and port shapes.

The trade offs versus the increase in width of the engine and lowering of the CG of the engine just dont work. As with anything mechanical in nature. there are trade offs that have to be made in order for the project to go ahead.. Including a F1 race car and motor.

Beast
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