What is the right intake runner for a street car?
Hi,
for a street car you need high torque at low RPMs, for a race car you need high power at high RPMs.
For high torque you need heads with a smaller intake runner volume to get a higher port velocity and better mixture of the fuel and air, but you don't want runners too big, they will kill the low end torque because of the loss of the above mentioned port velocity. For racing use you need a high volume of mixture, which is only obtainable by having big runners.
So, if I want to set up a street car, what kind of intake runner volume should my head have? What is big, what is small?
E.g. I am interested in buying World Sportsman 2 Heads, which have a 200 cc intake runner. What do you think about them?
http://store.summitracing.com/partde...5&autoview=sku
If I want to run my car with LPG (propane butane), what do I have to consider when I choose heads? What is here the optimum of the intake runner for a street car?
What else is important? What kind of valves/valves seats do I need?
THX.
James