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UK_Sub
Moderator

United Kingdom
2113 Posts

Posted - 04 Jan 2018 :  09:36:13 Show Profile Reply with Quote
Why do you need the balance pipe?

My V8 didn't have a balance pipe, just a pipe down each side of the car and that sounded great.
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pchristy
V4 Guru

United Kingdom
1750 Posts

Posted - 04 Jan 2018 :  15:37:57 Show Profile Reply with Quote
I'm no expert on car exhausts, but from what I've read a balance pipe (or an "X" pipe) will slightly increase the power output on a V8. It allows each bank of cylinders access to the "other" pipe during down-time, increasing gas flow. Although on a V8 the gains are quite small, I recall reading somewhere (I thought it was on here) that not fitting a balance pipe to a V4 will cause a massive power loss.

Remember our V4s are a bit odd. Because of the offset crank pins, it actually behaves more like an in-line 4 in terms of firing and overlap of the cylinders, rather than as a true "V" engine.

A Google search turns up lots of interesting links about balance pipes, but little information on their ideal location! I've had a couple of Ford 351 ci V8s myself, but both used a "two-into-one" exhaust - a bit like Andy's - so the V8 burble was well muted....


--
Pete
"Duct tape is like the Force: It has a light side and a dark side, and it binds the Universe together!"
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UK_Sub
Moderator

United Kingdom
2113 Posts

Posted - 04 Jan 2018 :  20:03:08 Show Profile Reply with Quote
Good to know, I always thought it was a shame that the V4 didn't sound like a small V8, so if you've cracked that - that's superb!
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TTruckie
V4 Fanatic

United Kingdom
279 Posts

Posted - 04 Jan 2018 :  21:54:02 Show Profile Reply with Quote
According to Jack Ashcraft's Fast V4 tuning book the tuned length for a Y-shape 2-1 'extractor' exhaust is 54'. This type of exhaust uses the offset pulses to assist each bank to get the gasses out faster and therefore gives more power. Apparently the Balance pipe is the next best design.

I think Woody's S&R Y-exhaust is this type.
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