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Thread: Diana Model 6 power

  1. #1
    Join Date
    Jan 2009
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    Derby
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    376

    Diana Model 6 power

    Hello
    I have a 1972 Diana Mod 6 pistol which I bought off this forum in 2011. It had been fitted with synthetic seals in 2010 by a well respected member who included photos of the strip and rebuild. Its been great and have used 2000 pellets. Just lately the power seems to have dropped and it is now reading 2 ft. lbs. using Hobby sports Line pellets 7 grain. Never chrono it before What is the acceptable power for this type of recoiless pistol please
    Many Thanks
    Dave

  2. #2
    Join Date
    Apr 2012
    Location
    Christchurch
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    4,486
    2.5 to 3.2 ft lb.

    Baz
    BE AN INDEPENDENT THINKER, DON'T FOLLOW THE CROWD

  3. #3
    Join Date
    Sep 2010
    Location
    London
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    5,785
    Quote Originally Posted by Benelli B76 View Post
    2.5 to 3.2 ft lb.

    Baz
    That. They were always listed at max 450 fps, which, with the 7grn match pellets of the day is a tad under 3.2.

    It may be down to the ravages of time, or quality of rebuilds, but Iíve seen recent chrono tests varying from 3.2 or a tiny bit higher down to as low as 2 and a bit. But ending up on 2 having been higher suggests that something is amiss inside.

  4. #4
    Join Date
    Jan 2009
    Location
    Derby
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    Thank you both for your replies. I will investigate further.
    Dave

  5. #5
    Join Date
    Apr 2002
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    Near Wimbledon, SW London, or Lusaka, Zambia
    Posts
    23,637
    I recently bought a giss pistol. It shot fairly well, but cocking didn't feel that smooth. I removed the two cog caps, and splurged in a gob of moly to each, getting it on the cog itself and the rear rack of the pistons. Put it back together, a couple of shots later I chrono'd it and it gained 30 fps and was much smoother to cock. Might be worth a try, but remember those caps are indexed so don't switch them around.
    Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.

  6. #6
    Join Date
    Apr 2012
    Location
    Christchurch
    Posts
    4,486
    I bought one a few months ago for 40 quid, nice condition but only doing 250 fps with 7 grn pellet. Thought the polyurethane piston seal had gone crumbly. Stripped it down and someone had already fitted a new one. What they had done was assemble it and had the two side gears out of position by one or two teeth. When I re-assembled it correctly fps increased by almost 200. Now shoots like a dream, smooth and accurate as they do in correct condition.

    Baz
    BE AN INDEPENDENT THINKER, DON'T FOLLOW THE CROWD

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