Ausmini
It is currently Wed Jun 20, 2018 4:24 am

All times are UTC + 10 hours




Post new topic Reply to topic  [ 13 posts ] 
Author Message
PostPosted: Wed Sep 13, 2017 4:13 am 
Offline
848cc
848cc
User avatar

Joined: Sat Feb 01, 2014 7:34 pm
Posts: 89
Location: Hamilton, New Zealand
Hi,

I know this has probably been asked a million times but I've only seen one post that has a similar setup and I want to know if this sounds about right.

As stated 1330 with 276 Kent cam, 1.5 rockers, extractors, extensive porting etc.

Currently I'm on about 24 flats which seems excessive but anything below 22 and it struggles to run. It does over run on shut down when it's hot or been running for a while especially in warm weather. Anything more than 24 flats and its rich so I'm picking the needles for a start are wrong.

I did read someone saying a number 3 or 4 needles with red springs. If that's a good starting point what sort of flats would I be looking at as a starting point.

Currently I have AAM needles with red springs and the HS4's were bought brand new a couple of years ago.

_________________
I dont like oil leaks


Top
 Profile  
 
PostPosted: Wed Sep 13, 2017 4:28 pm 
Offline
998cc
998cc
User avatar

Joined: Sun Jan 09, 2005 3:48 pm
Posts: 1087
Location: Kirrawee N.S.W
Try AH2 needles.

_________________
That's why it's good to be.............ME


Top
 Profile  
 
PostPosted: Wed Sep 13, 2017 7:48 pm 
Offline
1098cc
1098cc
User avatar

Joined: Sun Feb 20, 2005 8:11 pm
Posts: 1295
Location: Wellington,
The jets should be 1 to 2mm below the bridge of the carb. My engine is 1360 big ports, re13 cam twin hs4 red springs, dizzy correctly set up for the cam and AAm needles as well. Goes well.

You could be running it way to rich.

Kiwiinwgtn


Top
 Profile  
 
PostPosted: Fri Sep 15, 2017 7:40 am 
Offline
848cc
848cc
User avatar

Joined: Sat Feb 01, 2014 7:34 pm
Posts: 89
Location: Hamilton, New Zealand
kiwiinwgtn wrote:
The jets should be 1 to 2mm below the bridge of the carb. My engine is 1360 big ports, re13 cam twin hs4 red springs, dizzy correctly set up for the cam and AAm needles as well. Goes well.

You could be running it way to rich.

Kiwiinwgtn


hmmmm interesting... Swift set them up brand new so I would think they should be sitting right... I might come up a couple of flats and see... Cooperman over at the mini forum seems to think a number 6 will work well?!?

how many flats are you on bud?

_________________
I dont like oil leaks


Top
 Profile  
 
PostPosted: Fri Sep 15, 2017 10:30 am 
Offline
1098cc
1098cc
User avatar

Joined: Sun Feb 20, 2005 8:11 pm
Posts: 1295
Location: Wellington,
I dont set by flats. I set the jet down from the bridge in mm with a vernia caliper. By turning the nuts you move the jet. Aam needle is a floating 6 needle. If larry set it up it should be right. He gave me my needle recomendations which was pretty spot on.

Sent from my GT-I9505 using Tapatalk


Top
 Profile  
 
PostPosted: Fri Sep 15, 2017 10:32 am 
Offline
1098cc
1098cc
User avatar

Joined: Sun Feb 20, 2005 8:11 pm
Posts: 1295
Location: Wellington,
They will no longer to set correctly if you adjusted the nuts

Sent from my GT-I9505 using Tapatalk


Top
 Profile  
 
PostPosted: Fri Sep 15, 2017 11:42 am 
Offline
religious status
religious status
User avatar

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 38462
Location: near Baulkham Hills, NSW
I found #6 needles worked well in my 1293 with ported head, twin HS4s and Tighe 104 cam, with Corolla 1.46 rockers.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank @7000+, 45 Dellorto, RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. Going harder with Stealth Black Box in.:mrgreen:


Top
 Profile  
 
PostPosted: Fri Sep 15, 2017 8:06 pm 
Offline
848cc
848cc
User avatar

Joined: Sat Feb 01, 2014 7:34 pm
Posts: 89
Location: Hamilton, New Zealand
kiwiinwgtn wrote:
I dont set by flats. I set the jet down from the bridge in mm with a vernia caliper. By turning the nuts you move the jet. Aam needle is a floating 6 needle. If larry set it up it should be right. He gave me my needle recomendations which was pretty spot on.

Sent from my GT-I9505 using Tapatalk



Pretty sure the jets have been adjusted after I got them so I wouldn't know for sure what they were. Are you able to let me know what your measuring and I'll see how far off I am. but I may call Larry to ask.

_________________
I dont like oil leaks


Top
 Profile  
 
PostPosted: Fri Sep 15, 2017 8:30 pm 
Offline
1098cc
1098cc
User avatar

Joined: Sun Feb 20, 2005 8:11 pm
Posts: 1295
Location: Wellington,
You need to take the carb bells off needles out. Look down into carb. You will see the jet. Measure the depth it sits down from the bridge of the carb (the flat base on the bottom of carb)

Sent from my GT-I9505 using Tapatalk


Top
 Profile  
 
PostPosted: Sat Dec 16, 2017 4:54 pm 
Offline
Bimmer Twinky
User avatar

Joined: Mon Sep 06, 2004 4:36 pm
Posts: 8583
Location: Brisbane
just to try to help... it seems you may have your float levels to low to start with
if your mixture adjyustment has to go down that far to get it "close-ish" then i would suspect you will need to lift the float-levels first, before choosing another pair of needles

& then i would (personally) start with a pair of CP4 or MME needles with Red springs... just as a starting point, as you have cam & head mods etc

then with the float levels correct & those needls & springs youi should get closer to a decent "starting point"

hope that helps :-)

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.


Top
 Profile  
 
PostPosted: Wed Dec 20, 2017 7:44 am 
Offline
848cc
848cc

Joined: Wed Jul 02, 2014 11:38 am
Posts: 354
Yes my cooper S has 286 cam 1.5 rockers and HS4s A stupidly ported head and was very hard to get the off idle correct.I too have the mixture screws well down and recessed the needles in the piston to compensate.I needed like an AH2 to get off idle better and like an MME mid and top.CP4 MME BG all went super rich just above idle That is the critical zone that is hard to get quite right.I am now running BF needles that went lean coming off idle so I modded them with wet and dry and micrometer.Was very frustrating and I feel your pain


Top
 Profile  
 
PostPosted: Wed Dec 20, 2017 8:14 am 
Offline
religious status
religious status
User avatar

Joined: Fri Mar 19, 2004 6:19 pm
Posts: 38462
Location: near Baulkham Hills, NSW
I had CP4 then #6. I got rid of the rich spot off idle by leaving the dampers out after GR's AF meter showed the problem.
But in winter I put them back in with ATF.

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank @7000+, 45 Dellorto, RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. Going harder with Stealth Black Box in.:mrgreen:


Top
 Profile  
 
PostPosted: Fri Dec 22, 2017 12:52 pm 
Offline
848cc
848cc

Joined: Wed Jul 02, 2014 11:38 am
Posts: 354
I believe a lot of my problems was a talented head porter that wanted to impress me with large ports 1100S inlets instead of 1.401.We put the bigger inlets in as my mate worked at a machine shop and the difference was amazing.!The 1.5 rockers made a big improvement but the inlet ports are just stupid. Vizard doesnt agree with port enlargement much as it is not the bottleneck and neither does GR. I wonder is this why it was so hard with carb needles for me.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 13 posts ] 

All times are UTC + 10 hours


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  

© 2016 Ausmini. All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.