I made this manifold... only after driving a while we noticed that two of the runners are touching...
#4 and #1...

I've been thinkin on how to do this... but cant come up with a decent solution...

Is it a good idea to weld the two runners to eachother?
I'm worried about cracking...

thnx!

 

That's perfectly fine, it won't hurt anything. How big of a weld we talking?

 

just leave it. if you weld them together, i imagine it would be more prone to cracking because they aren't allowed to expand and contract seperated from each other at that point.

 

i would also say to leave it the way it is.

 

That is an amazing looking manifold, any more pics?

 

leave it.

 

it vibrates kinda rough around 5k rpm... that's why i wanted to do something about it...
i'm trying to run a small sawblade through it now... that should create a bit of a gap...

sorry... this is the only pic atm... i'll make some tomorrow...

 

Its most likely not the manifold but something else thats vibrating. Ive build manifolds where the runner was close and after a few heat cycles they were touching. Never heard any vibration noise from it.

 

Leave it, each runner will want to heat up a little differently and shift, welding them together will prevent them from shifting the way they want, causing cracks.

c jackson you owe me a lap dance.

 

bahahaha can you take a rain check? hows the biz?

 

hmm... the vibrating started when we changed the manifold...

 

A turbo hanging on the end of a manifold has a resonate frequency and sometimes it happens to be excited by the engine so it vibrates at a certain RPM. I doubt welding the runners together will help that.

 

leave it, and the runners wont vibrate against eachother, I dont even think that would be possible assuming there are no cracks anywhere. how would they vibrate?