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 Needle and seat modification 
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Joined: Wed Jul 02, 2014 6:17 pm
Posts: 530
tuner wrote:
Aww Thumper, now you've gone and hurt my feelings. There you go taking everything so serious. Needle point is fun but knitting is more likely to have a calming effect, sort of like tatting, perhaps you should try either one, unwind a little, your shift light is blinkig.

Since you want to take everything so literal, check the thread title. It says "Needle and seat modification" but you say you don't have time for modifications because the easy way is only $8 ....... to wit, "At $8-9 each I personally wouldn't....." ..... so what are we to think?

P.S. I see t compliments you get from people for your carb work, so you don't need to be so quick to think you have been impugned over something so simple. (note to self: wear kid gloves when teasing Thumper and use the sarcasm smiley liberally because his leg is numb and he can't feel it when you pull it)


A sense of humor is not my strength when poked at and if you knew me, you'd understand but all good and I guess my point was in this scenario I'd rather buy what I need than modify a N&S. One man show here and time is not always on my side if you understand what I mean..........Peace out!


Thu Jun 01, 2017 12:23 pm
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Joined: Fri Feb 08, 2013 2:37 pm
Posts: 1701
[sarc] Needlepoint is good for the numb leg syndrome because you can multi-task and acupuncture yourself at the same time. [sarc/]


Thu Jun 01, 2017 12:32 pm
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Joined: Wed Jul 02, 2014 6:17 pm
Posts: 530
tuner wrote:
[sarc] Needlepoint is good for the numb leg syndrome because you can multi-task and acupuncture yourself at the same time. [sarc/]


Last acupuncture I experienced was when SWAT tazed my ass a few times now THAT puts in in perspective I hope......... :thumbr:


Thu Jun 01, 2017 12:50 pm
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Joined: Mon May 15, 2017 4:04 pm
Posts: 60
Alkyvette wrote:
Hello Everyone,
I have many .100" viton tipped holley needle and seats, and was thinking about opening them up to
other sizes, either to .110" or .120". The thought was to cut off the lower crimp and remove the needle before drilling. My only concern is, should the needle seat be touched up, to ensure it seals?
I would think, the needle may seal tighter by reducing the seat area..? Has anyone on here had luck opening them up?
Thanks


How many do you have and how many of the larger sizes do you need?


Thu Jun 01, 2017 5:17 pm
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Joined: Fri Feb 08, 2013 5:50 pm
Posts: 2302
I guess when I can buy a quality N&S from .110 to .140, even .150 if I want, the time involved isn't cost effective for me. For your personal stuff where time has no set boundary thats fine. Things like drilling emulsion bleeds are cost effective for me.


Thu Jun 01, 2017 10:27 pm
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Joined: Fri Feb 08, 2013 2:37 pm
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Alkyvette wrote:
Hello Everyone,
I have many .100" viton tipped holley needle and seats, and was thinking about opening them up to
other sizes, either to .110" or .120". The thought was to cut off the lower crimp and remove the needle before drilling. My only concern is, should the needle seat be touched up, to ensure it seals?
I would think, the needle may seal tighter by reducing the seat area..? Has anyone on here had luck opening them up?
Thanks
tuner wrote:
Not a problem, I do it regularly to make large inlets (.130" +) to use with spring needles. It is best to drill in a lathe, but I have done by hand with a drill motor. After drilling, deburr with a stick of wood, wooden chopsticks are good for this, and then a twist of ScotchBrite, then, drop a 3/16" steel ball (vacuum secondary check ball, QJet accelerator pump check ball) in the orifice and tap the ball lightly using a brass rod and small hammer or the side of your needle-nose pliers. The ball will swage a smooth seat. Test by assembling in a bowl with a fuel line and suck a vacuum on it. If it holds the vacuum it is OK and will hold fuel pressure.

You can make big inlets for QJets this way too, .150", .160"+. You can make the seat bigger than the rubber tip, but you need to drill the rubber tip out of the needle in a lathe so the drilling is centered. Drill the needle with a 3/16" drill and that will leave the three ribs on the side of the needle to act as guides for the 3/16" ball used to replace the rubber tip.


Ironic that another of today's threads is a lament about parts prices increasing 40% today (June 1st) and here you guys are all so shot in the arse with diamonds parts are cheap. LOL

If you read the OP's post with a critical eye, you will see his question is thus, "should the needle seat be touched up, to ensure it seals?"

If you read my reply with a similar critical eye, my response is in the context of making a larger inlet you can't buy (at least, I am not aware of a .130" spring needle assembly, only .097") and describes my opinion of how to do it.

Carbs with only one inlet, like QJets and Rochester 2bbls often need a larger seat orifice than is commonly available, so if you are doing a carb for an engine that has relatively serious HP you need to make something you can't buy. Piece of cake.


Thu Jun 01, 2017 11:28 pm
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Joined: Wed Jan 29, 2014 12:00 am
Posts: 60
Tuner,
Thanks for the info, I will give it a shot. I started this thread, because I have 30 plus .100" needle and seats, and would like to put them to use. I build carbs for fun and don't mind investing the additional time to make these work.


Last edited by Alkyvette on Mon Jun 05, 2017 2:25 pm, edited 1 time in total.



Mon Jun 05, 2017 2:16 pm
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Joined: Thu May 08, 2014 7:47 pm
Posts: 206
LOL at all the chain yanking in this thread! :O


Mon Jun 05, 2017 2:24 pm
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