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martin01

TR Revington TR3A big bore exhaust and 4 into 1 manifold

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Has any one fitted the TR Revington stainless steel complete exhaust system with the Extractor manifold (Part No: RTR2074K) to a Tr3A with a high port head.  
 

I presently have a 4 into 1 big bore exhaust manifold with a straight through exhaust to a single large bore rear exhaust box.  The problem is it’s very noisy and Revington claim their system is much quieter at 93 decibels.  My present one is 122 decibels.  
 

The car has been set up with a fast road/track Newman cam, polished and ported etc and twin Webber 45 DCOE.  It goes well but the exhaust is to noisy for road/touring.
 

The TR Revington system is expensive and would appreciate any feedback prior to ordering a new system.

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I don't know how noisy the Revington system is but surely the only thing that is doing anything to quieten it down is the silencer box.   I wouldn't have thought that the Revington manifold won't be significantly quieter than the one you have.  Can you not just add an additional box to your current system.  FWIW, I have a TR3a with a Phoenix stainless manifold connected via a 2" dia pipe to a single 24" long rear box.  Yes it is a bit noisy but not excessively so.

Rgds Ian

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I have had a Revington TR manifold and system on my road going TR3a since it was rebuilt quite a number of years ago.

I seem to remember that a bit of relieving to the chassis is needed for manifold clearance.

Are you absolutely sure that your current system is 122db? That’s incredibly loud. The Phoenix big bore system (single silencer box) on my TR4 racecar sneaks in at just under 105db.

I’d follow Ian’s suggestion, if you’re sure your current system really is 122db, and add an additional silencer box

David

Edited by david ferry
Stupid predictive text errors

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 How did you measure the sound level? It should be measured this way:

Quote

5.17.5. For British Formula Three, British GT and British Touring Car Championships the sound test shall be conducted as set out within these regulations with the engine running at 3/4 maximum speed, the sound level meter at a height of 0.5 metres above the ground
(± 0.1 metre) located at 45° to and 0.5 metres distant from the exhaust with a maximum permitted sound level of 118dB(a).

Source: https://www.motorsportuk.org/assets/bb2018completelow-res.pdf

 

I did that on my TR2, with a sound level measuring device (class 2), and achieved 97,6 dB(a).

(Standard TR2 engine, manifold, exhaust setup, just one 24in silencer (without the later additional silencer)

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My full race TR 2 has only 1 silencer as well and passes noise test every time. below 105db.

i had the smaller 2nd box fitted before the rear one but found it not required.

 

ROY

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I have a Revington Rally system ( I use the standard manifold ) which is fine . I just had to fabricate a joining piece which was very easy.

Iain

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Martin

My TR2 with a similar spec, Webers high port head rally cam and Revington rally twin box exhaust with 4:1 manifold just gets in under the Castle Combe noise limit of 100dB

Great sound though

Phil

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15 minutes ago, PhilipB said:

Martin

My TR2 with a similar spec, Webers high port head rally cam and Revington rally twin box exhaust with 4:1 manifold just gets in under the Castle Combe noise limit of 100dB

Great sound though

Phil

offtopic: Is there a photo thread in this forum, where I can see pictures of all you great cars? ;)

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Hi thank you to all on the various comments, when the weather improves I will get the TR3 out of the garage and do another check utilising the the suggested method mentioned on the discussions.

I live just south of Cambridge, and I have made contact with a specialist exhaust company called Demand Engineering Ltd who are based at Stowmarket, Suffolk.  I did ask whether they could assist in manufacturing a better rear box box or even two in line, and they have asked for some photos of the exhaust taken beneath the car whilst on axle stands.  The various points raised so far on whether to get a single longer rear box or two in line will be looked at in depth.  If the snow and salt hold off I will then take the car to them to discuss the best way forward and costs of just making a bespoke rear box section on the existing exhaust.  
 

I will keep you posted on the decibel reading I get when measured at the distance and engine RPM suggested.

 

.

 

 


 

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9 minutes ago, martin01 said:

Martin, you just said:

"I have made contact with a specialist exhaust company"

Why !!!

You don't need a "specialist exhaust company"

You just need an off the shelf TR silencer and then take it to a local back street garage to fit it.

As soon as the word "Specialist" crops up, you know you are in for a price hike.

 

Charlie

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Hi it’s presently fitted with big bore 4 into 1 manifold and mid and rear exhaust, which consists of 3 sections.  The rear section is the box, not sure on make or supplier of the system but it’s to noisy. I suspect the rear box has poor quality or possibly no sound deadening inside.   I thought that getting a new large bore box might hopefully improve the situation?

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An anecdote. Some years ago when I was racing my Aston Martin DB 2/4 MK1 there were certain circuits stricter than others. I managed to avoid changing the silencers by saying the engine was running in and I didn't want to take it to the required revs for the test. It worked  quite well.

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How old is he current system? Is it that the "packing" in the silencers has just gone to pot? The system I fitted it the late 80's ( Tr shop) became very noisy replaced with the  Revington system (bar Manifold) in 2012. Mileage in between was not that high,.

I tend to agree with Martin, I would go to a good supplier and get a system that is known to fit and meet your noise requirements.

Iain

 

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Iain I’m not sure how old the exhaust system is, or even the manufacturer as it was already on the car when I purchased it late 2017.  The car had only just come out of a restoration by the previous owner, so I suspect the system was fairly new.  My current thoughts are to keep the system as is, but try and get an additional exhaust silencer fitted to hopefully improve the situation.

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I wanted my car to be quiet for European cruising. It was a long time ago and a specialist, in Wallington,  made a middle box for me. It needed adjusting, with a hammer, to fit without touching the chassis. The bracket on the gearbox mounting broke several times and was welded in a new position. In the end it stopped cracking but I still needed to make an adapter to connect the new pipe to the ST down pipe.  I also  fitted an original rear box, which rusted out and was welded up last year when I finally found a very competent local welder in Sussex.

It has been working very well for a long time. After that I concentrated on mpg which I have finally got back to 29/30 on Esso supreme.

It is all a challenge.

Richard & B.

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