Thread: Twin Spark Swap Owner's Satisfaction Survey
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Old 07-24-2008, 01:42 PM
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Grant Grant is offline
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Quote:
Originally Posted by 180OUT View Post
I


That's an intangable I'm still scratching my head over, Brett. Apparently, the 2L Nord and TS motors are pretty close together in terms of overall design; the major difference being the TS's better cylinder head. So, I guess a lynchpin question is how much actual difference in overall performance would there be between a 2L with well ported head, 10:1 compression, fully mapped engine management and a similar TS? It would be great if someone could take two similar cars and compare a strong Nord motor with a strong TS motor.
According to Jim K.'s book, the reason the TS is so much better out of the box has largely to do with the head design/valve angles, but a lot also has to do with the huge dome of the Nord pistons and deep dish in the head. Both of these were awesome ideas in the 40's, but people realized it lost combustion forces acting downwards on the piston, instead of against it going horizontally and other less-than-ideal angles. The TS can better utilize the same combustion and push directly down on the piston. TS piston is almost entirely flat.
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