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Thread: Rally2 (ex-R5) News
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6th December 2022, 11:58 #7051
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6th December 2022, 14:03 #7052
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also less friction at movement parts,and very near to the ''ideal'' 500cc for each cylinder.
Also less length of engine.
- Likes: becher (6th December 2022),TWRC (7th December 2022)
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6th December 2022, 16:53 #7053
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One difference
Maximum valve lift :
• 11 mm for a 4-cylinder engine
• 13 mm for a 3-cylinder engine
The cam lift must be homologated in VRa2.
The number and diameter of the bearings must be retained.
‘’VVT’’ and “VALVETRONIC” etc. type systems are authorised if original. They may be rendered inoperative.
Check article 261 to see if you can spot other differences:
https://www.fia.com/regulations/search
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6th December 2022, 17:47 #7054
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Also generally speaking a engine with more displacement per cylinder is more suitable to regulations with a small restrictor right?
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6th December 2022, 19:27 #7055
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6th December 2022, 19:51 #7056
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Where are all the engineers/ math experts that can explain the tech pros/cons of 3 and 4 cyl 1620 ccm turbos!
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6th December 2022, 20:17 #7057
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Well as an example, 1000cm^3 two cylinder motorcycle engines tend to produce more torque earlier in the rev range than 1000cm^3 four cylinder. Given the restrictor formula "forces" engines to be "low reving engines with lots of torque down low" there is a similarity in the power delivery i'd say, if the displacement per cylinder really does make a difference under current rules is another matter.
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8th December 2022, 12:51 #7058
Eurosol, to Simon Wagner
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8th December 2022, 17:01 #7059
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9th December 2022, 11:25 #7060
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The Fiesta ST switched to a 3-cylinder 1.5 engine with the Mk8 and it makes more power than the old 1.6. It's also used in the Fiesta Rally3 so it's clearly been found to be a good configuration.
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