Have you snatched the pebble from the Doc's hand Lillee?
Good information there.
KB
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| Optimum 1380 exhaust https://www.ausmini.com/forums/viewtopic.php?f=2&t=79841 |
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| Author: | coopar [ Sun Jan 06, 2013 4:10 pm ] |
| Post subject: | Optimum 1380 exhaust |
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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| Author: | drmini in aust [ Sun Jan 06, 2013 4:15 pm ] |
| Post subject: | Re: Optimum 1380 exhaust |
coopar wrote: 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 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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| Author: | IndigoBlueCooperS [ Sun Jan 06, 2013 4:21 pm ] |
| Post subject: | |
Does the 2 inch refer to the ID or OD? |
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| Author: | drmini in aust [ Sun Jan 06, 2013 7:05 pm ] |
| Post subject: | |
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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| Author: | IndigoBlueCooperS [ Sun Jan 06, 2013 8:45 pm ] |
| Post subject: | |
Thanks Doc |
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| Author: | Lillee [ Mon Jan 07, 2013 9:31 am ] |
| Post subject: | |
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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| Author: | 1310/71 [ Mon Jan 07, 2013 1:46 pm ] |
| Post subject: | |
Have you snatched the pebble from the Doc's hand Lillee?
Good information there. KB |
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| Author: | Lillee [ Mon Jan 07, 2013 1:48 pm ] |
| Post subject: | |
Wouldn't dream of it KB! Just didn't want coopar to buy the wrong set of extractors (costly mistake) |
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| Author: | coopar [ Mon Jan 07, 2013 5:05 pm ] |
| Post subject: | |
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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| Author: | drmini in aust [ Mon Jan 07, 2013 7:43 pm ] |
| Post subject: | |
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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| Author: | Lillee [ Mon Jan 07, 2013 8:41 pm ] |
| Post subject: | |
See Doc knows best 
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| Author: | 1310/71 [ Mon Jan 07, 2013 9:25 pm ] |
| Post subject: | |
Lillee wrote: See Doc knows best
You still have much to learn Grasshopper
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| Author: | drmini in aust [ Mon Jan 07, 2013 9:26 pm ] |
| Post subject: | |
1310/71 wrote: Lillee wrote: See Doc knows best You still have much to learn Grasshopper 
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| Author: | adamstuart [ Tue Jan 08, 2013 10:27 am ] |
| Post subject: | |
coopar wrote: Cheers for the info guys.
Lillee, this was the set I was going to get. http://www.minisport.com.au/prod1336.htm As far as I can remember, Karkraft sell those for <$200 |
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| Author: | XC9000 [ Tue Jan 08, 2013 1:14 pm ] |
| Post subject: | minispares.co.uk |
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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