Summit 650 question

[Joe DeCarolis]

Just had a Summit 650 follow me home. It's natural gas model 1880301 that has been converted to run on LP. It looks like the orifices were changed to LP but don't know whether there was a manifold change as well. What's the best way to determine whether it still has a natural gas manifold in it?

 

[Steve Hoch]

I can usually tell on an old Genesis by whether there is a fitting on the manifold for the hose or not. They looked identical other than that. I don't know enough about a Summit to say if that's the case though. Did you fire it up yet? The way it works could offer a clue.

 

[John-NY]

These are the valve cones from a LP 650 I had.
Not sure if you can look at yours to compare

 

[Joe DeCarolis]

I did fire it up and the flame height looks about right on high but I don't see much of a reduction in flame height on low. That makes me think this is just an orifice change.

 

[Steve Hoch]

I did fire it up and the flame height looks about right on high but I don't see much of a reduction in flame height on low. That makes me think this is just an orifice change.

That makes me think it was just an orifice swap as well. Unfortunately that's the way most people do it.

 

[LMichaels]

There are 2 versions of the 650. The old first generation and the 3rd generation had a 650 which morphed into the 670. But other than retractable rotisserie motor were the same grills.
I know the 1st gen 650 for sure you could not get an effective conversion with orifice only swap. IDK about the 3rd gen grills and I've never looked at one.

 

[Joe DeCarolis]

I did a temperature test comparing my S-670 with correct LP manifold with the 650 in question here. The 670 ran about 700 with all the main burners on high and about 350 with all the burners on low. The 650 ran up to 750 on high and about 600 on low. I think that confirms that it was just an orifice swap. Anyone have a good 650 LP manifold they want to swap for this natural gas manifold?