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Unexpected guests, 2 different size prime rib roasts...

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Scottborasjr
Scottborasjr Posts: 3,494
in EggHead Forum
So my brother-in-law's Mom and her husband are unexpectedly joining us for prime rib dinner this evening. I originally had a 7 and 1/2 pound roast, but with the extra mouths I figured I better get a little more so went back to the market and got a nearly 4 pound roast.  

Do I start them at the same time? Or should I put the larger one first and the 4 pounder on a little later.  I typically do prime rib around 300* indirect til done. Thanks for any insight ladies and gents. 
I raise my kids, cook and golf.  When work gets in the way I'm pissed, I'm pissed off 48 weeks a year.
Inbetween Iowa and Colorado, not close to anything remotely entertaining outside of football season. 
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  • lousubcap
    lousubcap Posts: 32,378
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    With roasts once the length exceeds the diameter the cook time is about the same.  I would venture that the 4 lb roast doesn't quite measure up against the 7+ lb one.  Here's a link to an article that should provide more insights:
    http://playingwithfireandsmoke.blogspot.com/1996/03/beef-standing-rib-roast-prime-rib.html 
    Enjoy the cook and eats.
    Louisville; Rolling smoke in the neighbourhood. # 38 for the win.  Life is too short for light/lite beer!  Seems I'm livin in a transitional period.
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  • Skiddymarker
    Skiddymarker Posts: 8,522
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    Length doesn't matter so much, it is thickness. (Man, that sounds disgusting doesn't it?) 
    Hit the amazing ribs site to see why a two rib roast will cook in a very similar tile to a 5 rib roast - it has to do with the diameter of the rib eye, not the length. 
    Bottom line, you can coo them together if they are the same diameter. 
    Delta B.C. - Whiskey and steak, because no good story ever started with someone having a salad!
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  • DMW
    DMW Posts: 13,832
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    Is the short one longer than it is thick? If so, cooking time will be about the same, larger will take just a bit longer. Are they about the same dimensions, just one is shorter I guess is the better way to ask.
    They/Them
    Morgantown, PA

    XL BGE - S BGE - KJ Jr - HB Legacy - BS Pizza Oven - 30" Firepit - King Kooker Fryer -  PR72T - WSJ - BS 17" Griddle - XXL BGE  - BS SS36" Griddle - 2 Burner Gasser - Pellet Smoker
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  • Scottborasjr
    Scottborasjr Posts: 3,494
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    Thanks @lousubcap that's exactly what I was looking for. Belated Merry Christmas and early Happy New Year to you and yours. 
    I raise my kids, cook and golf.  When work gets in the way I'm pissed, I'm pissed off 48 weeks a year.
    Inbetween Iowa and Colorado, not close to anything remotely entertaining outside of football season. 
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  • Scottborasjr
    Scottborasjr Posts: 3,494
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    here's a pic on the ping pong table.
    I raise my kids, cook and golf.  When work gets in the way I'm pissed, I'm pissed off 48 weeks a year.
    Inbetween Iowa and Colorado, not close to anything remotely entertaining outside of football season. 
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  • lousubcap
    lousubcap Posts: 32,378
    edited December 2015
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    My experience is based on 250*F on the dome and I will generally see around 25 mins/lb up to the length/diameter deal. I would give the larger one a head-start (never had the pleasure of wrestling with this  challenge ;) .  Base the start time on the larger one and then I'm guessing the smaller one will run pretty true to the X minutes/lb for 300*F (17-20 mins or so???) so use that as a guide for when to start it.
    But I could be all hosed here- just pull each when you hit your finish temp and enjoy.  And a belated Merry Christmas to you.
    Louisville; Rolling smoke in the neighbourhood. # 38 for the win.  Life is too short for light/lite beer!  Seems I'm livin in a transitional period.
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  • Scottborasjr
    Scottborasjr Posts: 3,494
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    Oh I'm sure it will be fabulous, just lit the Egg, dinner in 3 hours 40 minutes so we will see how it goes, thanks again for the thoughts guys. 
    I raise my kids, cook and golf.  When work gets in the way I'm pissed, I'm pissed off 48 weeks a year.
    Inbetween Iowa and Colorado, not close to anything remotely entertaining outside of football season. 
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