Exhaust manifold

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deekhubert
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Exhaust manifold

Post by deekhubert » Thu May 14, 2020 12:32 pm

Looking to strip out the exhaust manifold as having dramas removing the air down pipe and while its off I may look to replace the manifold anyway.

Anyone got anything worthy in ways of a replacement that I can buy?

Thanks

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Re: Exhaust manifold

Post by bigpete » Thu May 14, 2020 12:44 pm

I have one with a blanking plate already on it and I’ll get these clips sorted
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Re: Exhaust manifold

Post by warpc0il » Thu May 14, 2020 12:58 pm

Be aware that most aftermarket manifolds add nothing to performance and significantly increase the heat radiated to the steering uj and offside engine mount.

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Re: Exhaust manifold

Post by deekhubert » Thu May 14, 2020 1:43 pm

So am I best sticking to Mazda or look at the more expensive RB mani?

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Re: Exhaust manifold

Post by xamtex » Thu May 14, 2020 1:52 pm

the tube manifolds would be lighter i imagine...and shiney...well it would be if you could see it.the one i have to fit has a bracket with a threaded hole to mount a heat shield by the look of it

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Re: Exhaust manifold

Post by Scartlead » Thu May 14, 2020 2:03 pm

If your Looking at fitting the RB Mani, you'll get v limited power increases, but as mentioned above it sure looks good and in my own case is certainly louder than OEM, also miles lighter too . The extra heat output can be looked at by coating it, but not wrapping it.
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Re: Exhaust manifold

Post by Scotty PZ » Thu May 14, 2020 8:03 pm

I have a Racing beat manifold I would let go, its been used but is solid, no cracks etc. Drop me a pm if interested and I will take some pics.
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Re: Exhaust manifold

Post by deekhubert » Fri May 15, 2020 12:14 pm

definitely interested

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Re: Exhaust manifold

Post by Scotty PZ » Sat May 16, 2020 9:39 pm

Pictures sent pal
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Re: Exhaust manifold

Post by deekhubert » Mon May 18, 2020 10:57 pm

I picked up the RB mani from Scotty and must say I am mightily impressed, hardly any surface rust or issues.

I did research on using harpic max 10 and although the results were astounding there were also warnings from a few sites handing out warnings that as this is hydrochlric acid it could damage the piping. Also research on painting brought out issues that could cause cracking. Not exactly on show, but shiny is shiny, so it may be down to the good old dremel and general buffing.

Scotty gave me the mani with the air down pipe still attached and I have noticed that the securing nuts are looking old, rusty and very soft. I think the mixture of heat, water and the elements really play up on this area or it it a case of dissimilar metals playing a part and the nut is the sacrificial anode? Wondering if it’s worth swapping out for the nuts similar to that securing the mani to the engine block, I believe these are copper plated, thoughts?
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Scotty PZ (Tue May 19, 2020 12:48 am)

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Re: Exhaust manifold

Post by 350matt » Mon May 18, 2020 11:00 pm

I'd say to fit silver plated Knuts
these are a motorpsport nut that are stainless steel and then silver over the top
expensive at £1 a pop but I've been running them for 3 years and they're still rust free
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geofftl1000r (Tue May 19, 2020 12:21 am)

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Re: Exhaust manifold

Post by ChrisHolmes » Mon May 18, 2020 11:12 pm

In the good old days brass nuts were the order of the day. As you are fitting a blanking plate it’s a bit academic but you could use brass nuts.
Also don’t waste your time polishing the manifold because as you say it’s not visible on the car anyway and will finish up looking dull very quickly.
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Re: Exhaust manifold

Post by warpc0il » Mon May 18, 2020 11:44 pm

My Alfa has bronze manifold nuts
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Re: Exhaust manifold

Post by deekhubert » Tue May 19, 2020 8:26 am

Chris H, I am removing the down pipe to replace the SSV. So will be looking to put the pipe back on. I decided to replace the mani as I was in the area so to speak.

You may notice In another thread, down pipe woes, that this also went south when I managed to strip off one of the chassis strut brace nuts. Never a dull day but it is trying my patience.
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ChrisHolmes (Tue May 19, 2020 8:41 am)

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Re: Exhaust manifold

Post by deekhubert » Thu May 21, 2020 6:23 pm

I think I may have over done it on the cleaning
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Re: Exhaust manifold

Post by Scartlead » Thu May 21, 2020 6:25 pm

No such thing :) Looks v well. Time to fit now :thumright:
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Re: Exhaust manifold

Post by ChrisHolmes » Thu May 21, 2020 7:00 pm

Very impressive, what did you use to clean it apart from sheer elbow grease.
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Re: Exhaust manifold

Post by deekhubert » Thu May 21, 2020 7:36 pm

I did use watered down Harpic Max 10 (it contains Hydrochloric Acid) - warnings online were to keep it away from chrome as it strips it in seconds. also keep it away from alu as it will stain it.

As the mani is stainless steel, it came up a treat. It lifted a great deal of surface rust.

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Re: Exhaust manifold

Post by deekhubert » Fri May 22, 2020 11:43 am

Question ref the RB Cat Back exhaust - What would be a fair price for a second hand RB exhaust - Looking at one on fleabay and little concerned ref condition etc so weighing up options to go second hand or new

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Re: Exhaust manifold

Post by 350matt » Fri May 22, 2020 4:06 pm

depends on mileage /condition chap

its about £900 new so if its not blown baffles , silencer wadding out and has no holes in it then 250 to 300 quid

if its still shiny then more but they should polish up anyway

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Re: Exhaust manifold

Post by R1DSO » Sat May 23, 2020 9:42 am

Interested to hear the noise difference with the RB header. I’ve heard it’s louder, but can’t get my head around why a different section of piping (with no mufflers etc) would make a difference. Is it because the metal is thinner than the cast iron OEM header and, if so, do you hear the sound from the engine bay area, or just from the tailpipe as you would do if you fitted a mid pipe?
warpc0il wrote:
Thu May 14, 2020 12:58 pm
Be aware that most aftermarket manifolds add nothing to performance and significantly increase the heat radiated to the steering uj and offside engine mount.

Sent from my SM-G800F using Tapatalk
Would that heat be detrimental to solid aftermarket engine mounts (eg polly or the RRP rubber mounts) that aren’t filled with oil like the OEM mounts, Dave? Also, what’s the impact of increased heat on the steering universal joint - would it just need more regular lubrication?

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Re: Exhaust manifold

Post by Scartlead » Sat May 23, 2020 11:30 am

It is louder and really opens up the exhaust note. I have one of Carl's catbacks /cats, as I've read, in not having one, the RB cat back is far too quiet for my taste, but each to their own. I dont hear anything different from inside the engine bay, its all out the backside :)
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Re: Exhaust manifold

Post by deekhubert » Sat May 23, 2020 5:01 pm

Question ref the baffles or silencer wadding, can this be replaced. If so how?

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Re: Exhaust manifold

Post by R1DSO » Sun May 24, 2020 12:06 am

Scartlead wrote:
Sat May 23, 2020 11:30 am
It is louder and really opens up the exhaust note. I have one of Carl's catbacks /cats, as I've read, in not having one, the RB cat back is far too quiet for my taste, but each to their own. I dont hear anything different from inside the engine bay, its all out the backside :)
Nice, thanks for the info. The header sounds like it produces the right sort of noise in the right places, in addition to being a good mod to prepare for porting :thumright:. I’ll add it to my shopping list.

I was with you on thinking the RB cat back would be too quiet; I had my heart set on the Pettit modular system. However, I’ve gone full circle as I want to track my car minus the worry of getting close to or surpassing db limits – especially for low db evening sessions.

I’ve just ordered a Racing Beat mid pipe with 200 cell high flow cat, which I’m interested to compare to my current OEM resonated mid pipe. Although quieter than I would like, the OEM R3 back box actually sounds pretty good at higher revs with my current ghetto decat.

My theory is that, even if my new (200 cell catted, but not resonated) mid pipe is a little louder, I can fit a (louder still) RB header and have a great-sounding exhaust note that’s comfortably within track day noise limits if it’s all going through the stock R3 muffler or an RB cat back 8).

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Re: Exhaust manifold

Post by 350matt » Sun May 24, 2020 8:06 am

deekhubert wrote:
Sat May 23, 2020 5:01 pm
Question ref the baffles or silencer wadding, can this be replaced. If so how?
in word nope


but that said nothing is impossible
it would be a case of cutting open the silencer boxes and pulling out the old wadding and replacing it with new
then welding the boxes back together

you might also find the pipes cracked / baffles broken too
if an exhaust 'buzzes' this is often a broken pipe or cracked case

so if you have a welder and the inclination then go for it as wadding is cheap and expands to fill the gap when you run the engine

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