74snail wrote:
simon k wrote:
gafmo wrote:
7 does sound interesting as the GR83 comes on around 2200 and good all the way to 6 and I don't want it to lean out during this period. Where the HG does look like it leaner during this time
Any 1 tried a CQ or E3.
I have tried a EB and the engine was over heating which any of the above are richer so hopefully should nut that
EB would be a dog...
http://www.morrismini.com/SUNeedlesV2.a ... &size=.090did you figure out how the search thing works?
If I,m reading it right , its what I thought before , the No 7 is a bit lean at highway speeds and the HG better, and the HG is a bit leaner at traffic speeds which probably isnt good for a high lift cam but would suit something milder like a Kent 266, food for thought.
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the Y axis is thou, so the smaller the number, the thinner the needle... #7 is a lot richer than HG.
#7 would be nice, because you'd set it up with a good idle, and a relatively weak spring. It'd open up quick, and not lean out
From what I've been finding (with my limited knowledge), the general recommendations from 30 years ago (Vizard et. al.) are all too lean with todays fuels. I put this down to the rubbish they're made from, and the atomisation properties designed in to them to suit injection, which doesn't necessarily suit our motors. According to Vizard, our motors prefer a bigger droplet, so a richer needle
I wish I had my own dyno and a 998 with a 1 1/2" carb to play with and see what works and what doesn't...
matt wrote:
what am I looking at?
side-by-side comparisons of SU needles.
If you load a needle into the pink bit at the left, then put a 'filter' checkbox(es) beside a station(s), then a number (IE 20 = 0.020") in the richer and/or leaner box, then click search, it'll show you needles that are the richer or leaner
The blue bar (short list) gives you a way to cut through the clutter and keep a list of your favourites to compare against each other
So for instance, if you had a HG, and it was OK, but too lean when you were at wide open throttle at high revs, you'd put look it up in the pink bit, then filter on station 11 (to start with), and put 150 in the richer box.
Clicking search, you'd see crap loads of needles, all within .150" richer at station 11, so refine your search, repeat, repeat, repeat
You might filter station 3 to be .010" richer, cos you only want a little bit there.
When the search results are sensible-ish, pick out a few by their colours, put them in your short list, then keep refining
for instance I ended up looking at a CR needle
http://www.morrismini.com/SUNeedlesV2.aspx?linklist=7;CR;HG;&size=.090
