new needle valves

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brichter
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new needle valves

Postby brichter » Mon May 18, 2020 9:30 pm

I ordered some needle valves and seats from McDonald and when they arrived, I noticed that the ends of the needle valves was flat instead of sharp to fit the taper of the seat. Have they changed the design or did they send me the wrong needle valves.
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Re: new needle valves

Postby Bob McCarty » Mon May 18, 2020 9:49 pm

BR, They were having problems with the quality of viton needles (sticking, leaking, etc.) . Morgan told me that they spent over a year testing this design. If you look in the bottom of the needle seat, you'll see a small raised ridge that the flat pad seals against. Someone (I think Gary Dotson) mentioned that these were similar in design to an old Holley needle and seat.
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Re: new needle valves

Postby Gary Dotson » Tue May 19, 2020 7:17 am

An aftermarket supplier had those available for Holley carbs. quite a few years ago. I encountered a few of them while doing carb. rebuilds. I guess they worked o.k. I tried one that I got from Morgan, in an "H" last year and I couldn't make it seal. I gave up on it and put the original needle & seat back in. All is well!

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Re: new needle valves

Postby Bob McCarty » Tue May 19, 2020 9:17 am

Personally, I still think the steel needles are best, but they are expensive.
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Re: new needle valves

Postby SONNY » Tue May 19, 2020 2:02 pm

YUP---can't beat the good ole steel ones!

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Don McCombs
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Re: new needle valves

Postby Don McCombs » Tue May 19, 2020 2:03 pm

Bob McCarty wrote:Personally, I still think the steel needles are best, but they are expensive.

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