Change of cranskshaft pulley to lightweight.

[PositronicRay]

PeterBurgess said:

I tuned an old P6 auto 3500 saloon today and it made me think of the marginal improvements.
We did some initial runs then played with the ignition timing and recorded the blue power line with the lowest torque and bhp. We noticed there was little effect above 2000 rpm playing with the timing so we looked for a bottle neck. Someone had messed with the inlet tube attached to the drum-type air filter housing and it no longer had the small radiused entry to the pipe. We tapped it back into shape with a ball pein end of a hammer and a nylon mallet. The resultant improvement is shown in the middle dark red torque and power line, only a little more power but all welcome. The higher tourquoise line was what would be achievable with K&N cone filters straight onto the entrance of the SU carbs. The owner decided to go with the original filters (middle lines for torque and power) to keep the car original.

Peter

[url]|http://thumbsnap.com/ZEgDTiI3[/url

Interesting. Would the K&N's still produce an increase out on the road when drawing hot air from the engine bay?

[PeterBurgess]

Of interest the carbs have a tendency to ice up at certain times of the year with K&Ns so I am guessing, even though they are above the exhaust manifolds they run cooler than the air drawn from the middle of the carbs in the valley with the standard system. So, yes bhp is increased on the road as well.

Peter