Topic: Staking fuel valves

[eigenvector]

A concept that I stumbled on while randomly reading the web tonight.

I should be clear, I'm not advocating it - I'm curious about it with respect to our SOHCs.
For those not familiar - or not sure what I'm referring to, I mean the idea of driving a ball bearing into the fuel valve opening to knock down the opening's sharp edge (chamfer it) and also provide a larger surface for the rubber tip of the fuel shut-off valve to seat against.
Supposedly this increases the lifespan of the shut-off valve's tip and improves fuel flow.

Is this even necessary or more out of date information that may have only applied to things made before the 1950's or something?

[CycleRanger]

Is this even necessary or more out of date information that may have only applied to things made before the 1950's or something?

I'm going to say no and yes.

This sounds sketchy even for the '40's.  More like 1920's. 

I'm not going to be pounding any ball bearings into any needle valve seats.

[eigenvector]

Well I'm sure it would be sufficient to take a conical burr and simply smooth out the edge.  No reason to beat up the valve seat! 

Like I said - not advocating it, just something I came across.  Neoprene fuel valve tips were mentioned specifically - so I doubt it deals with carbs older than the 70's.  It also mentioned cheap manufacturing techniques so it could specifically be about aftermarket replacement fuel valves.

Anyways, I thought I'd toss it out there to see if anyone has come across it.

[strynboen]

ve use bearing ball to hammer valve seats in small hydralik and air valve/kontra valve pneumatic and hydralik..but it are only id ve dont can find/get the Things as standart parts..its nice to use in diesel systems in farm or ship or transport reperair..but this days vgere commonrail and bus konnekted fuel systems is the days standart..all this handwork is gone..no one can fix anu engines vitaut a computer and..the Companies make big Money on it...

fuel valvets  seatson a sohc os not ball shaped..so no idea of hammer a ball in the seat

[Killer Canary]

Is this even necessary or more out of date information that may have only applied to things made before the 1950's or something?

I'm going to say no and yes.

This sounds sketchy even for the '40's.  More like 1920's. 

I'm not going to be pounding any ball bearings into any needle valve seats.

Not the needle valve.
The fuel valve on the tank.

[CycleRanger]

Is this even necessary or more out of date information that may have only applied to things made before the 1950's or something?

I'm going to say no and yes.

This sounds sketchy even for the '40's.  More like 1920's. 

I'm not going to be pounding any ball bearings into any needle valve seats.

Not the needle valve.
The fuel valve on the tank.

I don't what eigen was reading but here they are very definitely talking about the carb needle valve seat.
http://www.thecarburetorshop.com/Fuel_valves.htm

[Killer Canary]

Now I'm confused.
Would you sort us out Eigen?

[eigenvector]

He has it right - same article too.

[Killer Canary]

Fascinating read.
But I'm not going to be the first fool on my block to try it.

[CycleRanger]

He has it right - same article too.

Yeah I get what they're going for there but that article reads like it was copied from a 1950's copy of Hot Rod magazine.

[Killer Canary]

It seems to me that the bearing selected would have to be a precise size to match the taper of the needle tip, no "approximately".

[strynboen]

think you can make a new seat..hammer a neddel valve(solid steel one) in to a soft seat.

(.and then put a nev valve inn..as the hammeered one is smashed.)..but vill never try on a bike..as ve can bay new one..

.ve alvays use a nev ball after make a seat use one..at teknik scool ve made hydralik pump jacks  lifts use that prinsip..
 still Works... have mine in 25 years