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Merlin question: RR vs Packard pistons?
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Author:  krislhull [ Thu Jan 30, 2014 10:41 pm ]
Post subject:  Merlin question: RR vs Packard pistons?
I was recently given a new old stock Merlin piston, still covered in 35 year old cosmoline, and after I have gotten it cleaned up, I am wondering if there is a way to tell, based on the part number, if it is an American made piston, or a British made one? Below are photos of the ID markings. Image Image
Author:  51fixer [ Fri Jan 31, 2014 8:26 am ]
Post subject:  Re: Merlin question: RR vs Packard pistons?
RR P/Ns typically begin with a D for the Merlin, GN for the Griffon. Thats for parts they designed and made.
Packard P/Ns are all numbers and begin with 60, 61, 62.
Looks like their is a D on it and no 60 series so I'd cautiously claim RR.

Their also maybe a production by a vendor for Packard using a RR design standard so I'm not 100 percent.
Author:  shrike [ Fri Jan 31, 2014 9:02 am ]
Post subject:  Re: Merlin question: RR vs Packard pistons?
I'd edge towards RR simply for the use of 'drams' on piston weight. Not normal US practice.
Author:  krislhull [ Sun Feb 02, 2014 11:19 pm ]
Post subject:  Re: Merlin question: RR vs Packard pistons?
Thanks for the info, Rich.
Author:  Merlin51 [ Sat Feb 08, 2014 10:20 pm ]
Post subject:  Re: Merlin question: RR vs Packard pistons?
I'm not certain it's either, unless it's a very early piston. Do you have a picture of the whole piston?
Author:  Red Tail [ Thu Feb 13, 2014 6:00 pm ]
Post subject:  Re: Merlin question: RR vs Packard pistons?
Merlin51 wrote:
I'm not certain it's either, unless it's a very early piston. Do you have a picture of the whole piston?


I agree with this...inside looks very different than the Packard-Merlin Pistons I have.

John
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