ported N/A 6 port engines
12-13-07, 09:42 AM
#1
U.S. Army Recon 93-04
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ported N/A 6 port engines
Question
Do you guys with ported engines, are you still using your 5th and 6th port actuation?
If you are using them still....why?
since porting is almost the same as open 5th/6th ports, without timing changes from the porting. IE: more flow.??
Do you guys with ported engines, are you still using your 5th and 6th port actuation?
If you are using them still....why?
since porting is almost the same as open 5th/6th ports, without timing changes from the porting. IE: more flow.??
12-13-07, 09:50 AM
#2
No it's not the same thing.
It'll just be a bigger port when your aux ports open. When you port a motor you'll naturally lose a little bottom end. Higher air flow means less torque, generally. Bigger exhaust, free flowing intake, porting, they all move the torque band up the rpm range.
It'll just be a bigger port when your aux ports open. When you port a motor you'll naturally lose a little bottom end. Higher air flow means less torque, generally. Bigger exhaust, free flowing intake, porting, they all move the torque band up the rpm range.
12-13-07, 08:01 PM
#5
Big ports are good for high rpms. Moderate ports are good for low rpms. Ideally you'd keep the 5th/6th port actuation. That way you don't lose as much power (or maybe you gain power) down low when you enlarge the ports. The reason is b/c there is some overlap causing air to leak directly from the intake to the exhaust. This happens a little even on the stock ports. The leak is worse when your motor is turning slow. At the same time a port is far more restrictive when the air velocity is high, but far less restrictive when the air velocity is low.
But if all you care about is peak HP regardless of low end power, mpg and emissions, you don't need your aux ports.
But if all you care about is peak HP regardless of low end power, mpg and emissions, you don't need your aux ports.
Last edited by ericgrau; 12-13-07 at 08:06 PM.
