original 45 new plastic piston washer

[Geezer]

I believe the 34 had different stroke lengths in its production run. Early short cylinder versions being the shortest and then a slight difference between t01s and later models.

Correct.

Also liking the “Benjamin Super Steak” on the chart posted above, which I believe is a cousin of the Crosman Nitro Pork.

[millybot1]

morning at work now i have chopped the titan down to 262mm i'll go from there let you know the outcome
millybot1

[BTDT]

morning at work now i have chopped the titan down to 262mm i'll go from there let you know the outcome
millybot1

That's brought the spring down to circa 29 coils, and lost ~40mm of preload, so the piston should receive somewhere in the region of 28 ft. lb., nearer where it needs to be.

Not having any idea of the energy efficiency of the 45, I don't know what the muzzle energy will be.

[TonyL]

And yet another excellent article in the new issue of AGW, Jim, concerning the merits of short and stiff vs long and soft springs.

[millybot1]

update lads i have put the titan no 3 spring in i have cut it down to a finished size of 242mm this gives me 780 fps for 11.22 ftlbs with the original leather washer fitted from new i steeped in neatsfoot oil for a couple of days so that will do for me off for 2 weeks after friday so i'll test it out then thanks for the wise words
millybot1

[TonyL]

Excellent result.

Just shoot and enjoy and check the power after a few more hundred shots.

How would you say the action feels in terms of smoothness?

[millybot1]

very smooth sort of soft if you know what i mean tony
millybot1

[Benelli B76]

Just to correct a misnomer, the material used for over 90% of piston seals in spring airguns today is polyurethane not PTFE and Teflon which is totally different. Polyurethane is tough and resilient with an excellent memory. PTFE is malleable and can change shape.

Baz

[TonyL]

very smooth sort of soft if you know what i mean tony
millybot1

Sounds lovely then.

As per before, shoot and enjoy and take pride in a job very well done.

[TonyL]

I have a feeling it's the same as a D34, Jim ?


Attachment 278378

I had to do a quick Google search as the chart I have stored on my PC didn't have the D34 on it, Tone. :-

Attachment 278379



I'll post them both to Bruce's thread when I get five.

Sorry to be a pain, Uncle Mick, but if you get the chance it would be lovely to have these on our Brucie's excellent thread.

Hope you're feeling a little less wobbly?

[jonnyone]

Took delivery Thursday of two vortek 28 mm conversion seals for Diana and others. They appear well made n good quality.
Hope to fit them in an old Original 45 and a 50T01. Both after the leather heads have cone off, drilling n tapping both.
Fingers crossed.....
Dave

[Rutherford99]

Took delivery Thursday of two vortek 28 mm conversion seals for Diana and others. They appear well made n good quality.
Hope to fit them in an old Original 45 and a 50T01. Both after the leather heads have cone off, drilling n tapping both.
Fingers crossed.....
Dave

Hi Jonnyone
what was the result after fitting the Vortek seals?

Chris

[jonnyone]

Hi Jonnyone
what was the result after fitting the Vortek seals?

Chris

Evening Chris.
Unfortunately the project has stalled a little as whilst the pistons are out of both guns (and currently sitting in a large brown envelope in the kitchen), I've not been able to push on with matters as am awaiting some assistance to machine off the existing heads and drill/tap them to accept the synthetic ones.
As soon as I've pushed on with this I intend to report back results of re assembly of the guns with no other additional work being done to them.so as to try and isolate the benefits of the conversion alone. That said as we all know simply stripping and re assembling a gun will upset the balance of things.
But we shall see anyhow.
Thanks for taking the interest and hope to report back very soon.
Dave

[Rutherford99]

Evening Chris.
Unfortunately the project has stalled a little as whilst the pistons are out of both guns (and currently sitting in a large brown envelope in the kitchen), I've not been able to push on with matters as am awaiting some assistance to machine off the existing heads and drill/tap them to accept the synthetic ones.
As soon as I've pushed on with this I intend to report back results of re assembly of the guns with no other additional work being done to them.so as to try and isolate the benefits of the conversion alone. That said as we all know simply stripping and re assembling a gun will upset the balance of things.
But we shall see anyhow.
Thanks for taking the interest and hope to report back very soon.
Dave

I've just fitted the Vortek seal to my Model 35 after also fitting the TW Chamber ultra tune kit, with the leather washer and Titan no 1 spring fitted as is with no shortening. Initially I'm getting just under 9 ftlbs and it feels pretty smooth. Will give it a try out at the range tomorrow.