I have a Diana M34 1998 vintage and am installing a Macarri tune kit with new seal what kind of velocity should I expect with 14.3s or others once broken in. It was making 660 before the spring broke and it had thousands of pellets through it, at least 5K, maybe 10K.
" . . . all you have to do is give it a few drops of lube and pull a few patches every now and again . . ."
Quote from: DAN 25 on July 01, 2022, 02:31:31 PM" . . . all you have to do is give it a few drops of lube and pull a few patches every now and again . . ."This may be more important that you would think for the actual yield of the gun.Depending on WHERE you put those few drops of lube, you may have a substantial contribution to the total energy coming from a "little oil" dieseling in the combustion chamber.Oil migrates, and it migrates to places we would not normally expect it to. The migration depends on how the gun was stored and what oil was used.Comparing a newly installed kit to an older setup that has bee fully "run-in" is not quite an apples to apple comparison.In GENERAL, in 0.22" cal. the D34 will yield around 16 ft-lbs with OEM parts. USUALLY, a tight guide fitted to the DIANA spring is the most efficient energy-wise.Because commercial springs are made to wide tolerances, the guide that fits one DIANA mainspring may not fit exactly as well to the next.HTH, keep us posted!Thanks for your concern about dieseling but I am familiar with that. I have an overpriced little container of RWS silicone chamber lube, and I follow the factory recommendations of one or two drops in the chamber every 700 - 1000 shots. The same silicone chamber lube on the non-pressurized side, more than in the chamber, of the compression tube. I like assembly lube, moly grease, on the hinge and a little break free clp on other moving parts but sparingly. I think I have been clear that I am installing a full Macarri tune kit with top and bottom guides, his spring, tar and piston seal. I also have written about running half a tin of pellets before even breaking out the chronograph. I can say that Mr. Macarri's lower spring guide is a nice tight fit requiring a solid tug to extricate it from the grip of the mainspring. I dug around quite a bit on this site as well as Air gun Nation and have yet to find anyone complain of Macarri's product. Some make note of him being quite a character but not a bad report on his products. This is the first time I have torn down a springer for an overhaul but I have been working on motors and motor bikes since the age of 9 years old and am soon to turn 59. I have raced street bikes, dirt bikes and done some drag racing in my misspent youth and was tearing down small block chevys years before I could LEGALLY buy my own beer. I have considerable mechanical skills but am not afraid to ask others who have who have been there and done that. Thanks for your concern and I will post my findings and hopefully not mistakes.HM
Thanks for your concern about dieseling but I am familiar with that. I have an overpriced little container of RWS silicone chamber lube, and I follow the factory recommendations of one or two drops in the chamber every 700 - 1000 shots. The same silicone chamber lube on the non-pressurized side, more than in the chamber, of the compression tube. I like assembly lube, moly grease, on the hinge and a little break free clp on other moving parts but sparingly. I think I have been clear that I am installing a full Macarri tune kit with top and bottom guides, his spring, tar and piston seal. I also have written about running half a tin of pellets before even breaking out the chronograph. I can say that Mr. Macarri's lower spring guide is a nice tight fit requiring a solid tug to extricate it from the grip of the mainspring. I dug around quite a bit on this site as well as Air gun Nation and have yet to find anyone complain of Macarri's product. Some make note of him being quite a character but not a bad report on his products. This is the first time I have torn down a springer for an overhaul but I have been working on motors and motor bikes since the age of 9 years old and am soon to turn 59. I have raced street bikes, dirt bikes and done some drag racing in my misspent youth and was tearing down small block chevys years before I could LEGALLY buy my own beer. I have considerable mechanical skills but am not afraid to ask others who have who have been there and done that. Thanks for your concern and I will post my findings and hopefully not mistakes.
Just beware the ARH seals tend to be oversized. If your OEM seal isn't nicked and doesn't leak, it might be worth reusing so you won't need to worry about sizing or break-in of the new seal.As far as spacing, I wouldn't expect there's much room to add spacing to a full power kit, but you can always try. If there's too much spacing, the gun won't cock.Have fun!