NG/LP Valve & Orifice difference Genesis x000


 
Bruce said:
Josh, in the future, if you don't have both valves to compare, you can tell if it is NG vs LP by finding a 3/64" drill bit. If it fits into the orifice, it is a NG orifice/valve. If it doesn't, then you are holding an LP orifice/valve.
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Unless someone just installed hogged out orifices. So it's not a 100% way to tell what it is.
 
LMichaels said:
Here is the issue. On many Weber grills they use distinct valve spools based on the intended fuel. They way the valves work is this. The main metering orifice does basically nothing at less than "full throttle". All the metering for anything from low until you get to full is done by the spool itself. All the main orifice does is limit max flow. You could almost run it without the main orifice if you only did it on low (please do not try this it's for illustration ONLY).
Where the issue comes in with the shysters on FleaBay selling "conversion kits" is the sell you main metering orifices ONLY. So if you have an LP grill and you install NG orifices and send it the proper flow and pressure it will operate just fine. At high ONLY. When you start cutting back to medium or low, you can get flame outs because not enough gas is flowing to keep the burners lit. Flameouts can be and IMO are VERY dangerous. Because you have no flame but gas is still flowing and collecting under the hood. Now if you have say one burner go out but more than one are lit, you can get a pretty good fireball in there. Will it blow your grill off the deck? No it will not. But, it CAN make a pretty good "woomph" if you should open the lid in that condition. Or it could build up and blow the lid open.
Now take the opposite. You have a NG grill but put LP orifices on it. This is simply "inconvenient". Because you will never get the output down to a normal "low or medium" level. But, at least it's not going to be a safety issue.
To my knowledge Weber is the only company who makes their grills this way. IDK why, but they're a royal PIA IMO. Because of it. About every other mfgr I know of makes a simple kit to convert between fuels. Some are so simple they only need one orifice change.
Weber could easily make conversions like this they choose not to
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Hi- Sorry for hijacking the thread, but I'm new to the forum and searched for some answers to my issue. What was written above is very pertinent. I just bought a used Genesis 2 LX S-640. It is set up for LP. I have a natural gas line I want to hook it up to. Do you ( or anyone else) know about the valve/valve spools and whether I can do a conversion to NG without changing or modifying the valves? Thanks in advance.
 
Joe Boscolovic said:
Hi- Sorry for hijacking the thread, but I'm new to the forum and searched for some answers to my issue. What was written above is very pertinent. I just bought a used Genesis 2 LX S-640. It is set up for LP. I have a natural gas line I want to hook it up to. Do you ( or anyone else) know about the valve/valve spools and whether I can do a conversion to NG without changing or modifying the valves? Thanks in advance.
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Odds are you cannot do a conversion without an entire manifold swap. There are SOME and FEW exceptions to this rule. but to be SAFE buy a manifold and do it correctly. Also if the original fuel version calls for a regulator buy that too.
 
LMichaels said:
Odds are you cannot do a conversion without an entire manifold swap. There are SOME and FEW exceptions to this rule. but to be SAFE buy a manifold and do it correctly. Also if the original fuel version calls for a regulator buy that too.
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I've looked for a NG manifold for it but wondering if anyone knows anything specific about the Genesis 2 LX S640 valves. The manifold I found is listed for the Genesis 2 LX S610. From what I've read, the difference between the 610 and 640 is the cabinet. Anyone???
 
Joe Boscolovic said:
I've looked for a NG manifold for it but wondering if anyone knows anything specific about the Genesis 2 LX S640 valves. The manifold I found is listed for the Genesis 2 LX S610. From what I've read, the difference between the 610 and 640 is the cabinet. Anyone???
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You may be right that the difference between a 610 and a 640 is the cabinet.

edit: this is not for an LX model

Grillparts.com lists them together.

edit: There are different part numbers for NG vs LPG burners. I've seen this on other genesis grills and have personally compared NG and LPG burners side by side and they appear to be identical.

So if you can find a manifold you should be set.

Weber Genesis II 610 & 640 Grill Parts | Burners, Cooking Grates, Flavorizer Bars & Radiants and More | grillparts.com

Weber Genesis II 610 & 640 grill parts from grillparts.com. Find the largest selection, best prices, and most reliable shipping from the original online store. We feature both original equipment and exact fit, high quality aftermarket parts from premium suppliers.
www.grillparts.com www.grillparts.com
 
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LX 640 has High+Sear on all burners and an infinity ignition on each burner that is controled by turning the burner knob. Also light up knobs.

610 has a button on the side like normal to ignite all burners.
 
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Yeah I did some quick searching. Came up empty. Not to come off badly. Please don't take it so. It's too bad people don't research this issue BEFORE laying out hard earned $$$
 
Josh Dekubber said:
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You are correct. I found all the schematics and part numbers for the 610 NG, the 640LP and the 640NG on Weber's website. The manifold for the 610 is part #66309. For the 640 LP it's #66481 and for the 640 NG it's # 66477 . The other difference I found was the burners themselves have different part numbers. For the 640LP, #67205 and the 640NG, #68824. Not sure what the difference is on those.

I don't think it makes financial sense to change the manifold and all the burners from LP to NG unless someone has some used ones. I'll just use it on LP till I find a good deal on an NG unit. Then I'll hand this down to my daughter and son-in-law who don't have NG.

Thanks for all your insight guys. I learned a lot just from this interchange and glad I found the forum. Keep on grillin !!!!!
 
Steve Hoch said:
The burner tubes do have different parts #'s, but by all accounts are identical to each other so don't let that throw you. All you really need is the manifold.
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Yeah I think that's just Weber being Weber. But the truth is unless a burner has integrated controls (i.e. built in orifices) it's simply a tube with holes. And there is otherwise no such thing as a NG burner vs an LP burner. Once the fuel is metered the burner doesn't care
 
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