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4 branch exhaust manifold questions

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4 branch exhaust manifold questions
Howard Wright Offline
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Joined: May 2018 Posts: 2,109 Threads: 110
Reputation: 22
Location: Llandrindod Wells
Car type: 29 Special, 30 RK, 28 C Cab
#1
11-08-2022, 10:01 AM
Hi All

I have a 4 branch manifold on my special with which I am not completely happy.  The plate is too thin at 5mm and the pipe bends make tightening the manifold nuts difficult.  So I intend to fabricate a replacement. I have an 8mm plate ready (thank you Bellini) and now need to design the system.

Question 1…. The existing pipes are 1 1/8” OD. Is this ideal or would 1 1/4” be better?

Question 2….  Welding between the two central pipes looks difficult so is brazing an option?

Question 3….  What is the best “pattern” for connecting the pipes at the exhaust end. A single collector or a sequence of pipe into pipe?

Thanks in advance

Howard
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Messages In This Thread
4 branch exhaust manifold questions - by Howard Wright - 11-08-2022, 10:01 AM
RE: 4 branch exhaust manifold questions - by Spex - 11-08-2022, 11:45 PM
RE: 4 branch exhaust manifold questions - by JonE - 18-09-2022, 09:19 PM

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