Headers?

Vast room for improvement, & IMO no need for a $4,000.00 aftermarket exhaust. Running gutted "Cats" & "Pre-Cats" is a great start, then replacing the heavily baffled stock muffler....I made my own "Custom Exhaust" for a few hundred $'s....I'll place mine against ANY aftermarket "High End" exhaust!!!.....Mark

 

For the headers, I don't think that you can do much better performance-wise -- JMO (I can't recall ever seeing an aftermarket TR/512TR header for sale).

 

Hello Don; I better understand your question now, I believe you are seeking an alternative to the factory "Headers" that bolt to the cylinder heads. This I find interesting, as I would like to know how the factory headers "flow" vs an aftermarket/custom made header/s. I believe there is a tremendous amount of untapped HP in "That Flat 12". I'd like to experiment with various cam profiles, & porting & polishing the heads, etc,etc,. If ground clearance wasn't an issue, I'd like to fabricate a "Bundle of Snakes" 180 headers...I can only imagine the "SOUND"!!!!.....Mark

 

Would 180 deg. headers be necessary on a Ferrari? Seems I recall Ferrari F1 headers in groupings of 3 then into 2 per bank , with 4 for exhaust tips.



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Ferrari already uses well-designed "180 deg" headers (but this description really only applies to V8 cyl engines with 4 cylinders in each bank) by virtue of their engine design -- i.e., Ferrari uses a flat 12 engine design where the exhaust pulses entering the exhaust manifold in each bank are equally separated by (720 deg)/(# of cylinders in each bank) = 720 deg/6 = "120 deg" headers, and each sub-group of 3 are equally separated by 720/3 = 240 deg.

On conventional US V8 (with a cross-plane crankshaft, that doesn't have "alternate bank firing"), to achieve this relationship requires running exhaust tubes from some cylinders in one bank to the exhaust manifold in the other bank -- so isn't such a good thing for overall packaging (nor tube length).

 

The Cosworth F1 engine had A flat 180 crank like a 4cyl. so the cylinder pairing would be easier in an F1 car. The Ford DOHC Indy engine of the 60s had a 90deg. crank with the exhaust ports in between the V, they took the exh. and made a bundle of snakes to pair the exh. pulses equally. The Ferrari V8 has a flat crank that is why they sound so good.



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