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8 & 10 cyl Bristol cars Type 407 onwards - restoration, repair, maintenance etc |
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![]() Hi Peter. The 360 engine is a lot lighter than the 400 but the
reduction in power is compensated by the drop in weight. The engine is set lower I believe but there a lot of additional steel in the chassis. There are two large reinforcing plates under the driver and passenger which sit on the polar moment of the car which also shift the weight from above the roll axis to below it which reduces body roll to a degree by reducing the roll center and concentrating mass inside the wheelbase. The shift of weight towards the lower half of the car and the fact that the 412 S1 (400 engine) weighs in at 1714 kg as opposed to 1783 for a 603 with the lighter 360 engine gives some indication of the difference in total mass reduction. As I am not an engineer so I can't explain further, I can only report that my S2 is very well balanced, especially with the front shocks on a hard setting and the rear set quite soft. Perhaps some other 412 drivers can elaborate? Paul |