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T O P I C    R E V I E W
pchristyPosted - 25 Dec 2017 : 16:41:41
The Jetex on my V4 finally let go (in a BIG way) a few weeks back, about 30 miles from home! The RAC managed a bodge to get me home (very noisily!), but it had been on there for about 7 years, so I can't complain!

I decided to investigate getting a custom stainless steel one made. I wanted something that would restore that wonderful V-engine burble, but not as noisy as the Highgate originally fitted to the car. It wasn't cheap, but I'm well pleased with the result:

https://www.youtube.com/watch?v=5YsrYpT6yRo

Rock on!





--
Pete
"Duct tape is like the Force: It has a light side and a dark side, and it binds the Universe together!"
15   L A T E S T    R E P L I E S    (Newest First)
TTruckiePosted - 04 Jan 2018 : 21:54:02
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.
UK_SubPosted - 04 Jan 2018 : 20:03:08
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!
pchristyPosted - 04 Jan 2018 : 15:37:57
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!"
UK_SubPosted - 04 Jan 2018 : 09:36:13
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.
pchristyPosted - 03 Jan 2018 : 23:25:06
My original 96, back in the late 60s, had a SAH exhaust, which was a two-into-one-back-to-two system. But the nice thing about a twin with a balance pipe is that you get that lovely V-engine "burble".

--
Pete
"Duct tape is like the Force: It has a light side and a dark side, and it binds the Universe together!"
andydeans3Posted - 03 Jan 2018 : 21:25:22
Ah yes, Melle, you're right. I missed that.

1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro
mellePosted - 03 Jan 2018 : 20:11:50
Pete's car has twin exhausts with a balance pipe.

www.saabv4.com
andydeans3Posted - 03 Jan 2018 : 12:24:26
Pete

I had a stainless, custom job built on my 96 as well, though they brought the pipes together in a "Y" formation, rather than a "T". They said it would aid gas flow.
Photo below.

[url=https://flic.kr/p/224cp7U]

1978 LHD SAAB 96
1978 MGB Roadster
2008 LHD "Classic" Renault Twingo
1991 Nissan Figaro
pchristyPosted - 31 Dec 2017 : 15:37:08
Closer to 1 3/4" (45mm)



--
Pete
"Duct tape is like the Force: It has a light side and a dark side, and it binds the Universe together!"
shoestringPosted - 31 Dec 2017 : 15:22:47
Thanks for the pictures Pete, is it in 2 inch diameter?

Cheers,

Barry
pchristyPosted - 31 Dec 2017 : 14:28:28
Managed to get out and take some pix of the exhaust today. Sorry if some are slightly blurred, I was trying to take them in the garage - not much room and at a funny angle!

First up showing the off-side rear pipe leading to the silencer (the near side is a mirror image):



You can just see the silencer box through the towing eye. Here it is from another angle:



It tucks up inside the well quite neatly!

Here's the front showing the position of the balance pipe:



And here's the other side:



I've never found any calculations as to the exact positioning of a balance pipe. The only reference I could find was that it should be as close to the headers as possible! I've no idea if that's right or not! But as you can see, its fits quite neatly just in front of the front axle line.

It may just be because of the sound, but the car feels slightly livelier than on the Jetex, and I've been able to go about 1/8 of a turn leaner on the idle mixture.To me, that suggest its slightly more efficient. It may be worth trying slightly leaner main jets in the carb now, but I'll leave that until the weather improves a bit - or until I can find a rolling road at a reasonable price!

For the moment, I'm just enjoying it!





--
Pete
"Duct tape is like the Force: It has a light side and a dark side, and it binds the Universe together!"
mellePosted - 30 Dec 2017 : 18:00:45
That sounds and looks great Pete! So much better than the ricer-style Jetex tip.

www.saabv4.com
stevebodPosted - 30 Dec 2017 : 14:59:07
Sounds great.
TTruckiePosted - 28 Dec 2017 : 19:12:33
HI, It sounds great.

I assume it is twin pipes with a balance cross pipe at about 54"

I need to re-jig the current one on the sonett as it is too noisy at about 3000RPM which is cruise speed. Currently Jetex header and centre resonator splitting into 2 cherry bombs at back.
pchristyPosted - 28 Dec 2017 : 10:57:51
My son and his family came to visit over Christmas, and out little grand-daughter has managed to leave us all with stinking colds! (Children are *killers*!) As soon as I feel up to it, I'll get out and take some pix and post them here. Essentially, it mimics the Highgate twin system, but with smaller pipes and proper silencers at the rear.

A word of warning though: Custom stainless steel work is not cheap! It is guaranteed for life, however!



--
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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