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 Posted: Sep 16, 2020 10:50AM
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CA
Quote:
Originally Posted by Spank
Quote:
 
I didn't realize there were multiple manufacturers of the RC40.

Either way, my experience and opinion stands and it appears your anecdote falls in line.

I don't know if there's more than one RC40 manufacturer.  Keith Calver did some testing of various RC40 systems (date unknown)  https://www.calverst.com/technical-info/exhausts-rc40-millennium-and-others-tested/
In the article he comments that the manufacturing process had changed at some point.
In the test notes below the table of results, he says:
"Test 5 - for comparison one of the RC40 'copies' was tested. Although performance was quite good, it was still 2-3bhp down on the original. Noise levels were OK too.
"Test 6 - for the 'boy racers' I wanted to test one of the 'budget' 2" systems that abound on the market. The twin box version caused an almost blanket power loss of some 3-4bhp and the single box (Test 7) some 5-6bhp. The noise was very intrusive in all but very light throttle conditions."

Apparently there were/are copies/imitations around.


 

.

"Hang on a minute lads....I've got a great idea."

 Posted: Sep 16, 2020 09:15AM
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Quote:
Originally Posted by Dan Moffet
Quote:
Originally Posted by Spank
It has been my experience that every single RC40 "kit" is between 2" and 4" too short.

Frustrating.
Depends on the manufacturer. My SS single box RC40 fit just fine from the Cooper Freeflow connection to the location of the (side exit) muffler centred within the rear subframe. Where it did fall short is at the tailpipe - it should be about 2" longer to get out past the bumper.
I didn't realize there were multiple manufacturers of the RC40.

Either way, my experience and opinion stands and it appears your anecdote falls in line.

 Posted: Sep 16, 2020 04:36AM
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CA
Quote:
Originally Posted by Spank
It has been my experience that every single RC40 "kit" is between 2" and 4" too short.

Frustrating.
Depends on the manufacturer. My SS single box RC40 fit just fine from the Cooper Freeflow connection to the location of the (side exit) muffler centred within the rear subframe. Where it did fall short is at the tailpipe - it should be about 2" longer to get out past the bumper.

.

"Hang on a minute lads....I've got a great idea."

 Posted: Sep 16, 2020 03:53AM
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US
Forget the donuts. A 10 dollar bill before the job starts to the tech is like gold and he will remember you in the future.

 Posted: Sep 15, 2020 03:44PM
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The RC40 is a non-standard part....  extractor exhausts are non-standard parts....  People fit them to a range of cars built (and modified) over the last 50 years....

How many variations of each might there be?

You choose to fit non-standard parts you make allowances for your custom fit.

Its not rocket science.

Cheers, Ian

 Posted: Sep 15, 2020 01:19PM
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It has been my experience that every single RC40 "kit" is between 2" and 4" too short.

Frustrating.

 Posted: Sep 15, 2020 08:38AM
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CA
The front end of the exhaust pipe (what you are calling the tail pipe) should be expanded to fit over the header pipe.
If it is long enough to overlap, you can take it to a muffler shop and ask them to expand it to fit over the header pipe. Their machine should be able to do it in a few seconds. They may even do it for free if you tell them about your "project". If, so, the kind, thankful gesture is to drop off a box of doughnuts. (Properly speaking, the tail pipe is the last piece of an exhaust system that goes from the muffler out the "tail" of the car past the rear bumper.

.

"Hang on a minute lads....I've got a great idea."

 Posted: Sep 15, 2020 07:45AM
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  Doing some upgrades on my 75 Austin 850 and decided to install this RC40 kit I purchased. I was also given a nice
Cooper header ( single outlet) to complete the system.

 However once I installed the rear section (muffler and resonator) I discovered that the tail pipe from the resonator to the header was too short. And in addition it is the same OD (outside diameter) as the header. So am I missing a pipe that connects the tail pipe to the header? Or is my 
tailpipe the wrong part. Kit was two pieces. Muffler, and resonator, and a short tail pipe. (Really short)

Thanks in advance

Mini Dave
RC40