Well i got my seals today and i was surprize to see no difference in outer diameter between
the tesla and the apex larege seal exept for the stiffenes in material,the tesla is harder
material.now my question is on maccari`s site it says that the tesla would need sizing to
fit,but i don`t see a difference that justifies removing anything from tesla to fit.
Does any of you guys have any experience with using the tesla vs the apex as far as fitting
or removing any material off of the tesla.any help is appericiated.thanks.
Re: real difference between tesla and apex seal...
September 9 2009, 12:45 AM
I don't know if you need to size the seal and what's the best way to do it, but I am guessing that the Tesla one might need sizing despite tha fact that it has the same diameter just because it's stiffer and doesn't compress/give in when installed on the piston and then in the compression chamber. That might result to excessive friction and moving resistance of the piston/seal assebly thus loss of power and has to be addressed during fitting.
What I am wondering though if that sizing takes place automatically during the break in period - and most propably even better as it's sized by itself precisely on the chamber's internall dimentions/contour - and this whole procedure is just for the inpatient ones that want near maximum performance from the first shoots...
thanks for your kind respond.i havn`t had the chance to try it in the compression chamber
since i had to come to work after cheking the mail,but i will definately check both apex
and tesla for fitting.my understanding was that if the fit is tight then you remove some
from the seal lip,but if the start of feeding it in the tube is not to tight what you remove
can`t gain it back so it`s better to be safe and maybe let it break in by itself at the
expence of loss of speed.thanks.
To expand on what Dimitris and Warren have said, the Apex is a soft seal and fits well in the compression chamber right away. I have installed 6 of these in the last year and they all fit easily and seal well. They also have slight gains in performance over a short break in period. I UNDERSTAND the tesla seal is both harder and more wear resistant. That means if you don't custom fit it, it will take a Looooong time to wear in. Once fit, it will perform well for a Loooooong time also.
And yes Walter, it is subject to the problem of "I don't understand, I cut that seal down 5 times and its still too small???"
Your's still has the leather seal? Seen posts suggesting the transition point to synthetic was about 1983. No matter. Your gun is shooting at a fair fps, regardless.
I believe that the early version of the Diana/Original Mod.45 all have leather seals. The reports of a transition to synthetic in 1983 maybe erroneous. I have a 1983 version & it has a leather seal. The version that came out in 1988 (restocked Mod.34) is the only version that I am aware of that has a synthetic seal. I have seen schematics of the Original Mod. 45 that illustrate two different pistons, both pistons appear to have a leather seal.
seal materiel is part of the equation. A harder seal will generally give you a tad more speed at the sacrifice of a smoother shooting soft seal that has better parachuting characteristics. Harder seals will also burn up faster too. I have burned 5 seals in a day experimenting with different sizes and designs to get it just right. That is the perils of power tuning and speed tuning. I have depend the parachute groove too to smooth out the shot cycle. I also have shaved the face to get more power ! Its a fine line,. To small and it has blow by. Just right and its a power shooter. If the seal is hard it is gonna burn faster. Shoot heavy pellets and you will get a longer life. Sad fact is RWS seals are good seals. Some of my best builds have RWS factory seals. They take longer to break in that is why I size them prior to install. They are softer yet have a great parachute grove. Very little velocity loss is had with them when done right. Tesla seals are good and make good power but I have burnt many testing.
Below in the post "Sent off my 350 to Umarex" I did an extensive post in an important area that is not discussed at all in the prior posts on this issue. This debate depends much on the quality of the tube-compression chamber. With a great tube you can get more FPE out of a harder seal as there is less drag. The softer seals expand more and are good for the in and out of a varied tube wall. Also if you size any seal even the soft ones for max HP right after the tune your are not going to bl pleased with seal life and harshness after 1000 rounds or so.
The other thread that is good is
"HW Breach Seals"
It is still an open although dormant forum vs. the closed one. You just need to sign up for a Delphi account. LD's and Hans Weir's forums are active today and are good too.
