Question:
Why do you sell camshaft kits where inlet and exhaust is different?
Answer:
Choosing different camshafts for the inlet and exhaust is quite common, it allows the engine designer to produce different characteristics from an engine. Competition engines have a different set of requirements to road engines, road engines are all about emissions first where competition engines are about power and performance.
There are no hard and fast rules, but a basic guide is that the milder the exhaust cam in relation to the inlet cam, the earlier in the rpm range the engine will produce torque. The more aggressive the inlet cam, the higher up the rpm range, the engine will be able to carry on producing power but there always has to be a compromise. You cannot just fit a very small exhaust cam and a very big inlet cam.
The only way to discover where the cams should be timed to, so to tune them to optimal performance is to start at some safe values and then swing the inlet cam and the exhaust cam through the range settings (obviously safe to ensure no mechanical contact) on a rolling road noting the results from every setting and every combination to see which produces the best overall performance to suit your requirements. Unfortunately you will need to experiment with not only cam profiles and combinations, but you could then go further with the exhaust design optimising for each setting. This, as you can imagine, is a very time consuming and expensive task, not only are you wearing the engine out, but with the cost of the dyno, fuel and the person mapping the engine, this can very easily cost many thousands of pounds.
We sell many products not only to the retail customer but also to the trade customers, because we have developed and tested our components and evolved packages over time.
Category:
Engine Build