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tuning an su
https://www.ausmini.com/forums/viewtopic.php?f=2&t=77989		 Page 1 of 2
Author:  TBOT70 [ Fri Aug 10, 2012 6:41 pm ]
Post subject:  tuning an su
ok boffins

i'll admit im rather clueless when it comes to the carby's, has anyone got any info, "how to's" or advice on what to do?

i'm running twin 1.25's, the car seems to be idling high at the moment , but unsure whether the idles are even, mixtures are balanced (i think)

i have gunsons colour tune and carbalancer kits, not really sure how to use them correctly but

please help!!!!!!!!!!

im looking at you doc haha
Author:  simon k [ Fri Aug 10, 2012 8:02 pm ]
Post subject: 
the Scientific Publications #64 workshop manual has what I reckon is the best explanation of how to synchronise twins properly

I have a carbalancer, but the most useful bit of it is the rubber tube - poke it into your intakes and listen
Author:  TBOT70 [ Fri Aug 10, 2012 8:15 pm ]
Post subject: 
ok thanks simon

how can i get hold of it but??
Author:  simon k [ Fri Aug 10, 2012 8:46 pm ]
Post subject: 
this one is my favourite, but it's usually cheaper than this - http://www.ebay.com.au/itm/1959-1971-sp ... 35bc77eee3

this is meant to be excellent, but I don't have a copy - http://www.ebay.com.au/itm/MINI-FACTORY ... 1e70cdba45

both of them cover Australian specific stuff, so they're a must-have
Author:  TBOT70 [ Fri Aug 10, 2012 10:35 pm ]
Post subject: 
i have the 2nd one but not the first one
Author:  Tobermary [ Sat Aug 11, 2012 8:03 am ]
Post subject: 
Don’t know if this going to help……but worth a look to help get an idea.
Don’t know if it’s been posted before…….

http://www.youtube.com/watch?v=ASeMfXfj ... _embedded#!

Cheers neil
Author:  drmini in aust [ Sat Aug 11, 2012 9:37 am ]
Post subject: 
simon k wrote:
the Scientific Publications #64 workshop manual has what I reckon is the best explanation of how to synchronise twins properly

I have a carbalancer, but the most useful bit of it is the rubber tube - poke it into your intakes and listen

I agree ^^
That SP #64 manual was also sold as a Gregory's #64.
I reckon it's the best manual for Oz roundies. Wiring diagrams are correct, and it has correct details on Oz windup doors, unlike most others.
Author:  Wombat [ Sat Aug 11, 2012 9:44 am ]
Post subject: 
Two emails sent with manuals attached.

Edit: sorry second one is 9Mb hope it gets through

Edit: Both bounced

I'll put them up in a cloud link - hold on while I sort it :wink:
Author:  Wombat [ Sat Aug 11, 2012 10:56 am ]
Post subject: 
Here is a link to the files in Drop Box https://www.dropbox.com/sh/lnz1w1vgds5ho2e/DJSEMs2PNw

The JPG files are from SU Butec - the other is a PDF files of a manual - parts are not clear - sorry
Author:  simon k [ Sat Aug 11, 2012 5:39 pm ]
Post subject: 
TBOT70 wrote:
i have the 2nd one but not the first one


read the section on adjusting twin carbs
Author:  TBOT70 [ Sun Aug 12, 2012 3:32 pm ]
Post subject: 
just finished tuning my carbs

ok so standing at the front of the car facing the engine the right hand carb was about 3/4 to a full turn behind the left carb on idle adjustment, about 3 full turns of mixture nut behind left carb (ie had to be 3 times richer, and idle higher)

question is, is that normal??

car is driving 10 times better, idle is lower (it was revving that high at idle that it was getting hard to get into gear) , take off and power through the rev range is ridiculous compared to what it was (no more surging lol), feels like a new car lol

cheers for all your help guys
Author:  drmini in aust [ Sun Aug 12, 2012 3:49 pm ]
Post subject: 
The difference in the jet height nut position may be explained by wear in one jet or on one needle.
If they are fixed needles (most HS2s are) the jet need to be centred so it don't rub on the needle when the piston is down.

If the carbs have done a lot of work, fitting new jets & needles to both is a good idea.
Author:  TBOT70 [ Sun Aug 12, 2012 4:00 pm ]
Post subject: 
they may need re centering, but they havent done much work, they are virtually new, put on the car in december, brand new from england

but when i raised the piston thing they both fell freely

i think thats how you check??
Author:  drmini in aust [ Sun Aug 12, 2012 4:06 pm ]
Post subject: 
Yes, they must fall freely to hit the bridge, and not stick.
Author:  TBOT70 [ Sun Aug 12, 2012 5:36 pm ]
Post subject: 
yeah both fell freely, no sticking anywhere

i dont know, might have something to do with the engine, i have no idea whats been done to it/in it
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