I think the stroke is possibly too short, making it oversprung for it's power. A 15mm reduction in stroke goves it the same swept volume as the Hw35 which is pleasant to shoot.
After reading the What is it about the 80 thread I decided to get mine out and have a blatt. This particular one is 22 & now has a 20mm shorter stroke plus buttons etc running at 11.3 with falcon accuracy plus. The big thing I noticed after shooting my 22 Diana 34 is how noisy it is. Not mechanical, just goes with a crack despite a vmach steel silencer v the unsilenced Diana in k form. I was wondering if this is to do with the stroke. Its fairly stable on firing and consistent, could it be the piston coming to rest quite sharply? It has one of the new HW seals fitted. What do the tuners think?? To me the Diana is much more pleasant.
Plinkerer and Tinkerer
I think the stroke is possibly too short, making it oversprung for it's power. A 15mm reduction in stroke goves it the same swept volume as the Hw35 which is pleasant to shoot.
Better to admit you walked through the wrong door than spend your life in the wrong room
i think he means it's .22 cal...
and yeah, stroke might be a fraction short, but the trans port is much shorter than the HW 35, so even with the same stroke it'll be a fair bit more efficient, and better looking
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.
Hmmm, have a selection of various short Stroke heads, may have to have a switcheroo and see what happens. Got a 15mm one in one of my 177 80's. Will have a shot to compare!!
Plinkerer and Tinkerer
As a minority long stroke fan I suppose that I would say that long strokes are more pleasant my 80 is a pleasure to shoot with its full stroke, its soft smooth and so easy to cock and all I have done to it in 16 years from new is debure, polish, relube and a custom spring guide, I would say it's not so noisy at the mussel as the 15.5 in barrel 34, the 80 is 16 in barrel, I have just shot over 10 shots after not shooting it for over a year and the fps were very consistent and it was accurate at a close range test. It is just under 11 ft/lb with .22 JBS.
Is your 34 a T01 as the stroke is a few mm longer than the T06.
Hi Barry, yes a T01. I have 3 80's, the, 20mm short stroked 22, a 15mm stroked 177 and a standard stroke 177. I have three because I like fiddling with them but I kept one standard (except for fitted guides) so I could compare after I had altered the others! Like the 80 thread says, there is something about them!! Same with rapids and Diana 34's for me too.
Last edited by maximus; 20-09-2018 at 06:11 PM.
Plinkerer and Tinkerer
Due to the weather I did some airgun fiddling this afternoon and chronod the 80. It's doing 11.3 with the light JSBs and 11.46 with the 16 grainers. Recoil is low so I am now loathe to alter it! Re-parallaxed the scope and fettled a Diana 34 instead to satisfy the tinkering urge!
Plinkerer and Tinkerer