jvb5577 Posted October 24, 2013 Report Share Posted October 24, 2013 Just read threw this. AWESOME work guys. :thumbup: I am going to be putting some 38mm flat top SUs on my lz22 soon and was trying to find some info on needle sizing. NOTHING is out there. Is there an online file on how to sand the needles? I didn't see a link or where can a get a book on it? Quote Link to comment
Sealik Posted October 24, 2013 Report Share Posted October 24, 2013 The Dime, Quarterly. Volume 4 Issue 1 https://docs.google.com/folderview?id=0ByCvxnHNk90SYzc4N2E1MWEtMzg0MC00YTE4LTkxZGQtM2RjODA5ODA1YjU1&tid=0ByCvxnHNk90SMzIxZWIwYWYtYzljNy00ZGU2LWI3ODctYzRjMmE0MGY3NTA1 Quote Link to comment
Just Joel Posted October 24, 2013 Report Share Posted October 24, 2013 The "how to" in this thread is as good as anything I've found on the interwebs ;) there is a DQ article mentioned earlier but it's rather short on detail imo You'll find that while the procedure is the same for modifying, you're profiles will differ because of your motor set. One thing you can probably count on is what regions to modify based on speed and throttle position... That should stay consistent. 1 Quote Link to comment
jvb5577 Posted October 28, 2013 Report Share Posted October 28, 2013 Just Joel and mtngoat Did you guys do any modification to the throttle shafts and butterflys on your 38s? In the DQ article listed above the mention 'thinning' out the shafts for less air restriction. Anyone try it? I am right now to try and get more air. For the throttle shaft seals, did you go with the ZTherapy bearings or just some rubber at the ends? How big is the gap between regions? Want to start to mock up a chart. Quote Link to comment
Just Joel Posted October 29, 2013 Report Share Posted October 29, 2013 No mods to the butterflys for me... gains seemed miniscule and probably only on the top, top end of rpm range ;) my throttle shafts are also unmodified... not worn so no need yet. And the needles are divided into 15 equal regions from base to tip. Quote Link to comment
Just Joel Posted November 8, 2013 Report Share Posted November 8, 2013 I made a new set of needles this evening and added the new profiles to the table under "Joel mod #3". Earlier, I described a rich condition in the lower rpm/speed range and I hope to correct this by leaning out the first six stations compared to my "Mod #2" set. I should have a chance to test them tomorrow if the weather cooperates ;) 1 Quote Link to comment
CorAce Posted November 15, 2013 Report Share Posted November 15, 2013 Hey Joel I'm interested in hearing how your new modded needles worked out. I haven't had the time to take mine apart to see what needles I'm running but according to my WBO2 I'm right in the same ball park as you between 11-15. I did have a problem last week with it running lean on the freeway but it turned out that the overflow lines had been partially plugged. Quote Link to comment
distributorguy Posted February 3, 2017 Report Share Posted February 3, 2017 Ok - sorry to bring back a dead thread, BUT... I am playing with this now too. Using .090" jets, Joel's #3 mod = #5 needles. Readily available. Standard MGB stuff. Probably adjust the jet 1 turn down from the bridge. The easy comparison can be made here: http://www.mintylamb.co.uk/suneedle/ Quote Link to comment
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