Ebay long tube Headers

BigT · 06-22-2012, 08:59 AM

Quote:

Originally Posted by 370Zfeeler

Not really, in fact they are smaller than the other brands, PPE LTH design uses stepped tubes from 1.75" to 1.875" and Fast Intentions is all 1.75" for the primaries.

Thats weird. All my V8 buddies say 1.7 and larger is only necessary for big block stroker motors. Our engines aren't necessarily on the large side.

SS_Firehawk · 06-23-2012, 04:13 PM

Quote:

Originally Posted by BigT

Thats weird. All my V8 buddies say 1.7 and larger is only necessary for big block stroker motors. Our engines aren't necessarily on the large side.

The amount of air that is flowing through a motor will dictate how large the primaries need to be.with 370's pushing as much power as it is from six cylinders, its understandable why they went that size. DOHC motors flow more air for its liter size than pushrod motors.

Srenity · 06-25-2012, 07:24 PM

Quote:

Originally Posted by BigT

Thats weird. All my V8 buddies say 1.7 and larger is only necessary for big block stroker motors. Our engines aren't necessarily on the large side.

Quote:

Originally Posted by SS_Firehawk

The amount of air that is flowing through a motor will dictate how large the primaries need to be.with 370's pushing as much power as it is from six cylinders, its pounderstandable why they went that size. DOHC motors flow more air for its liter size than pushrod motors.

Here is how it works. Engines are just air pumps in principle. So a 7 liter big block V8 has .875 liters per cylinder, and a 3.7 liter V6 has 0.62 liters per cylinder. The big block revs to about 6K RPM and the V6 to about 7.5K RPM so with one intake stoke every other rotation of the engine this equates to 2625 liters per minute of air flow per cyclinder at redline for a 7 liter V8. The 3.7 liter V6 would have 2325 liters per minute per cylinder of airflow at redline. Essentially the maximum air flow that any one primary on our engine is comparable to the maximum air flow on a big block.

BigT · 06-26-2012, 02:33 PM

Quote:

Originally Posted by Srenity

Here is how it works. Engines are just air pumps in principle. So a 7 liter big block V8 has .875 liters per cylinder, and a 3.7 liter V6 has 0.62 liters per cylinder. The big block revs to about 6K RPM and the V6 to about 7.5K RPM so with one intake stoke every other rotation of the engine this equates to 2625 liters per minute of air flow per cyclinder at redline for a 7 liter V8. The 3.7 liter V6 would have 2325 liters per minute per cylinder of airflow at redline. Essentially the maximum air flow that any one primary on our engine is comparable to the maximum air flow on a big block.

2325 is comparable to 2625?

dyno numbers don't always mean everything. Its part throttle response too, that adds to the "fun" factor in driving.

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