Been searching and searching but most of the posts relate to the 1275.
Is a 1 3/4 exhaust going to be too restrictive for my new motor. A straight pipe with single rear muffler is on the car at the moment, I need to buy extractors.
Am I better off buying a set of lcbs and getting a 2" pipe made up?

Cheers

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Tim

That's what I did. I used a Maniflow med bore LCB and put the 2" pipe over it. I have a single rear box but have since put a hotdog in front to shut some of the bark up.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Does the 2 inch refer to the ID or OD?

All exhaust pipe is tubing, unlike water pipe, it is sized on the OD.
The thickness is 16 gauge = 1/16", so a 1-3/4" OD pipe is a neat fit inside a 1-7/8" one. True also for other sizes.

Original Cooper S etc pipe size is 1-3/4" OD, (1-5/8" bore)

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks Doc

Coincidently I was browsing through the extractor options and I noticed one thing that may be of interest.

What I and many others term to be Maniflow "Medium Bore" LCBs may not actually end in 2" OD pipe? Not sure if this is a recent thing or it has always been like this but here is what I would term to be "medium bore" LCB

http://www.minisport.com.au/prod73.htm

Note that in the description it says it's 1 3/4" ID ending whereas what is labelled here as "Large Bore" LCBs ends in 2" OD

http://www.minisport.com.au/prod565.htm

The later is what you want, as this is what I have, ends in 2 inch OD pipe and then 2 inch all the way through to the tail pipe.

As mentioned it is EXTREMELY loud, more than 90 decibels for sure (used to set off car alarms just idling past cars in a carpark, imagine how loud it was at full tilt!). Highly recommend a twin box exhaust system that has a hot dog before the muffler. Make sure you can see through both items and there are no vortexes or any other baffles in the way of the 2" pipe and it won't hurt your performance at all.

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Lillee - 1969 Morris Mini K

Have you snatched the pebble from the Doc's hand Lillee?

Good information there.
KB

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Wouldn't dream of it KB! Just didn't want coopar to buy the wrong set of extractors (costly mistake)

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Lillee - 1969 Morris Mini K

Cheers for the info guys.

Lillee, this was the set I was going to get.
http://www.minisport.com.au/prod1336.htm
I think $400 is a little much for the other set.

Is there going to be much of a problem putting a 2" pipe over the end of the 1 3/4 extractors?

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Tim

Lillee, a Maniflow med bore Y piece is 1-7/8" OD, it takes a 1-3/4" pipe INSIDE.
A 2" pipe fits straight on OUTSIDE. Easy as.

as I said above, exhaust pipes are measured on the OD not ID.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

See Doc knows best

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Lillee - 1969 Morris Mini K

You still have much to learn Grasshopper

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

As far as I can remember, Karkraft sell those for <$200

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You're so square
Baby I don't care

http://www.minispares.com/product/Class ... 0to%20shop are the 'Fletcher' smaller bore but fm what the Doc says suit a 1-7/8" ID tailpipe. way cheap. about $70 plus freight id probably $120 delivered. Just my tuppence worth. What say ye

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..still waiting for the Italian Job sequel to see if the bus went down