Shorty header manufactures
12-18-2011, 11:55 PM
#12
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Join Date: Sep 2011
Location: Tacoma/Seattle
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Here are a few shots of the Ford Racing headers that I bought at Jegs. They are stainless steal but I had them coated just to be on the safe side. Came with all new hardware and gaskets. I used almost a full can of PB Blaster on the bolts and they all came out in one piece. Started soaking them about a week before I did the job.
Here they are installed.
The reason I replaced.
Here they are installed.
The reason I replaced.
12-19-2011, 08:46 AM
#13
Senior Member
Thread Starter
I think one is cracked on the bronco too and when I am done with the 2wd conversion I will look into the headers,are the cats causing too much heat to stay in the manifolds causing them to crack.
12-19-2011, 09:01 AM
#14
broke white boy
Longtube headers make the most HP, . First you have to understand why headers make HP. First off, both shorties and longtubes are designed to provide smooth passageways which the exhaust gases can flow through. They have gentle curves and smooth shapes which provides as little restriction as possible to the exhaust. This is an improvement over cast iron manifolds, which have a rough finish from the casting process, and which usually have tight turns with little regard to smooth flow. (As a side note, the OEM manifolds are actually very good as far as manifolds go)
Second--and this applies only to Longtubes--the diameter and length of the primaries (the tube between the exhaust port and the header collector) are carefully chosen to match the operating RPM range of the engine. Also, all the tubes are made to the same length (which is why some header tubes snake back and forth) The idea is that the exhaust gas pulse from one cylinder can be timed (with the correct length of primary) to literally help SUCK the exhaust gas out of another cylinder later in the firing order. This is called scavenging. Scavenging gets rid of the exhaust gas from the cylinder faster, which in turn brings in a fuller, denser, intake charge.
Shorty headers don't scavenge becasue the primaries are too short and are usually not equal length. All shorties can do is smooth out the flow a little bit compared to stock. LT headers do this AND they scavenge. That's why shorties are worth between 3-5 HP, and longtubes are worth 15-25 RWHP.
Second--and this applies only to Longtubes--the diameter and length of the primaries (the tube between the exhaust port and the header collector) are carefully chosen to match the operating RPM range of the engine. Also, all the tubes are made to the same length (which is why some header tubes snake back and forth) The idea is that the exhaust gas pulse from one cylinder can be timed (with the correct length of primary) to literally help SUCK the exhaust gas out of another cylinder later in the firing order. This is called scavenging. Scavenging gets rid of the exhaust gas from the cylinder faster, which in turn brings in a fuller, denser, intake charge.
Shorty headers don't scavenge becasue the primaries are too short and are usually not equal length. All shorties can do is smooth out the flow a little bit compared to stock. LT headers do this AND they scavenge. That's why shorties are worth between 3-5 HP, and longtubes are worth 15-25 RWHP.
12-19-2011, 09:28 AM
#17
broke white boy
12-19-2011, 09:39 AM
#18
Senior Member
Nice evaluation and explanation. I've been both routes and the ceramic coated JBA's look really nice, but, (as fordtrucknut stated) if you're buying for power gains, it's not much bang-for-buck. However, they sure do look much nicer than the stock rusty's and will give you just a tad more grunt down low!!!
12-19-2011, 01:13 PM
#20
Senior Member
Longtube headers make the most HP, . First you have to understand why headers make HP. First off, both shorties and longtubes are designed to provide smooth passageways which the exhaust gases can flow through. They have gentle curves and smooth shapes which provides as little restriction as possible to the exhaust. This is an improvement over cast iron manifolds, which have a rough finish from the casting process, and which usually have tight turns with little regard to smooth flow. (As a side note, the OEM manifolds are actually very good as far as manifolds go)
Second--and this applies only to Longtubes--the diameter and length of the primaries (the tube between the exhaust port and the header collector) are carefully chosen to match the operating RPM range of the engine. Also, all the tubes are made to the same length (which is why some header tubes snake back and forth) The idea is that the exhaust gas pulse from one cylinder can be timed (with the correct length of primary) to literally help SUCK the exhaust gas out of another cylinder later in the firing order. This is called scavenging. Scavenging gets rid of the exhaust gas from the cylinder faster, which in turn brings in a fuller, denser, intake charge.
Shorty headers don't scavenge becasue the primaries are too short and are usually not equal length. All shorties can do is smooth out the flow a little bit compared to stock. LT headers do this AND they scavenge. That's why shorties are worth between 3-5 HP, and longtubes are worth 15-25 RWHP.
Second--and this applies only to Longtubes--the diameter and length of the primaries (the tube between the exhaust port and the header collector) are carefully chosen to match the operating RPM range of the engine. Also, all the tubes are made to the same length (which is why some header tubes snake back and forth) The idea is that the exhaust gas pulse from one cylinder can be timed (with the correct length of primary) to literally help SUCK the exhaust gas out of another cylinder later in the firing order. This is called scavenging. Scavenging gets rid of the exhaust gas from the cylinder faster, which in turn brings in a fuller, denser, intake charge.
Shorty headers don't scavenge becasue the primaries are too short and are usually not equal length. All shorties can do is smooth out the flow a little bit compared to stock. LT headers do this AND they scavenge. That's why shorties are worth between 3-5 HP, and longtubes are worth 15-25 RWHP.
