Primary length isn't critical on cross plane V8 engines because it makes little difference - this is to do with the uneven firing and has been proven on dyno many times. Perhaps Stoneward nows more about tuned header design than you do
- Thread starter Stoneward
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Primary length isn't critical on cross plane V8 engines because it makes little difference - this is to do with the uneven firing and has been proven on dyno many times. Perhaps Stoneward nows more about tuned header design than you do
PhillipM
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It makes a lot of difference if you use a long enough primary that you can mate the whole lot at the rear of the engine and get back to an even firing pulse merger into the secondaries.
I can certainly think of dozens of racers where a lot of people spent some serious time and effort making sure that occured because of the benefit it brought...
I can certainly think of dozens of racers where a lot of people spent some serious time and effort making sure that occured because of the benefit it brought...
Thats a whole different proposition. With the Tri-Y design he has gone for, primary length will not make much difference.
Wallace
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All the perfect maths goes out the window when the steering column, starter motor, bulkhead, crossmember, heater, chassis rails, gearbox and floorpan that weren't added into the equation just plain get in the way. Life's a compromise, but you can always crack a beer and build a car around the perfect manifold but do remember to add some room for the next manifold when you change cams. 
