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Old 08-11-2014, 04:32 PM   #1
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I posted this in the on road engine section also with no replies. I have a couple of older pipes I am contemplating placing on a new Alpha .21 and was wondering if it is possible to tell if one will be better than the other for low speed torque or high end speed by looking and comparing the length and diameter of the two and which is which?
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Old 08-11-2014, 05:00 PM   #2
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Originally Posted by AlGio View Post
I posted this in the on road engine section also with no replies. I have a couple of older pipes I am contemplating placing on a new Alpha .21 and was wondering if it is possible to tell if one will be better than the other for low speed torque or high end speed by looking and comparing the length and diameter of the two and which is which?
Longer pipes and headers will make more torque. Shorter ones will be better at high RPM.
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Old 08-12-2014, 07:33 AM   #3
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Originally Posted by AlGio View Post
I posted this in the on road engine section also with no replies. I have a couple of older pipes I am contemplating placing on a new Alpha .21 and was wondering if it is possible to tell if one will be better than the other for low speed torque or high end speed by looking and comparing the length and diameter of the two and which is which?
best thing to do is just mount one and see how the engine runs. mj
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Old 08-12-2014, 07:45 AM   #4
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True.

Because you can not see the internals it is possible that a shorter pipe will give more torque than a longer pipe. Ofcourse on a same pipe changing the manifolds will give always the same effect as mentioned.
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