Taipan Vet Long .25 shot string --- after belville washer polish

[JohnnyPDX]

915, 235 BAR
915
915
915
915
915
915
912
915
915

915
912
915
912
912
912
915
912
908
912

912, 180 BAR
915
912
912
912
912
912
912
912
912

915, 145 BAR
912
912
912
908
908
912
912
908
908

915
908
908
908
908
905, 110 BAR
902
908
905
898, 

898
889
879......... looks like it dropped off the regulator here?
872
869
856, 85 BAR

END at 56th shot

If I stopped at shot 45 the ES would be 7fps. The regulator was said to be set at 140 bar and that high setting seems not neccessary shooting 25.4 grain 25 cal. I adjusted it down and have the previous and new measurement for the reg setting.

Polished the washers on a piece of marble tile (uber flat) with 600 grit wet / dry paper then douched with acetone, soap and lubed lightly with pure silicone from the dive shop.

Stack Pattern
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[vmaxpro]

Careful silicon can cause galling but clearly it worked great!

 

[JohnnyPDX]

Careful silicon can cause galling but clearly it worked great!

OH I see. Did not know about the galling. The three regs I've had apart, successfully, all had some lube / goop on them... what is supposed to go in there?

 

[JohnnyPDX]

What astonishes me is the difference between the reg settings from dealer to where I have it now. Seriously... 140 down to 90 bar. That's huge

The Taipan reg clearly has room to go up and shoot the 34 grain but I am not going that route

 

[nervoustrig]

Pretty much any lube besides silicone. Bear in mind the Bellevilles are not exposed to high pressure air so even hydrocarbon lube (eg 30W oil) is fine. Anything suitable for metal-on-metal.

 

[JohnnyPDX]

Pretty much any lube besides silicone. Bear in mind the Bellevilles are not exposed to high pressure air so even hydrocarbon lube (eg 30W oil) is fine. Anything suitable for metal-on-metal.

Thank You. I'll take it apart and remove the silicone.

 

[oldsparky]

I think a good method is to use oil like nervous suggested. I keep a bottle of mobil synthetic in my gun room to coat metal parts, then wipe them with a clean dry rag. A coating will stay on to protect the part from oxidation. That shot sting is tight!

 

[JohnnyPDX]

What is the ideal lube?

 

[JohnnyPDX]

I think a good method is to use oil like nervous suggested. I keep a bottle of mobil synthetic in my gun room to coat metal parts, then wipe them with a clean dry rag. A coating will stay on to protect the part from oxidation. That shot sting is tight!

Sorry I didn't see what you said an I will use synthetic 5-30W

 

[JohnnyPDX]

The gun shooting 25.4 grain maxes out at 931fps before it will cease to cock. Average being 912ish this seems like a good reg setting?

Thoughts?

 

[nervoustrig]

After having smoothed the bearing surfaces, anything you use will do the trick. This is an application with no complicated lubrication demands. It’s not high temperature or high speed or anything of that nature. The only pertinent advice is to skip anything that has a very light viscosity like air tool oil. So instead something like 30W oil (synthetic or conventional), Superlube synthetic grease, etc.

 

[JohnnyPDX]

Thank You guys I am taking it apart at this very moment

 

[mikes383]

String looks good! How did the stem look? Any scoring/grooving from the washers? I opened mine up (before I replaced it with a Huma) and did notice some grooves my nail would catch. In my spare time I'm going to polish the stem, washers, clean and reassemble but really wish I had a reg tester. The lube I was going to try is a moly paste used for flat tappet camshafts, only because I have it.

 

[nervoustrig]

Agreed, check the ID of the Bellevilles for a burr. Many have them...they are punched parts. Hit it with a deburring tool on the tearout side, then spin a Cratex point in it to smooth it. The cheap generics from eBay work great.

 

[JohnnyPDX]

The stem shows zero defects. 



I'll post a pic of what I measured to arrive at the numbers I currently have. The reg setting can be derived from the shot string but the re-assembly is where things get goofy unless you have a baseline measurement. The brass wheel moves freely so it's unlikely that re-assembly will be anywhere near it was prior.

 

[mikes383]

Without spring pressure that wheel/adjuster sure does move freely! How many turns did you back it off? I did one full revolution and that wasn't enough.

 

[JohnnyPDX]

 

[JohnnyPDX]

Just finished and tested it's maxed at 912fps with 25.4gr. The measurement above was too low, I believe, and I'll reset later to 32.7mm

COMPLETELY removed silicone from washers and replaced with 10-30w Honda power equipment oil, very light coating.

I'll do another shot string but looks like a very similarly close ES

 

[fe7565]

Very nice even string. What was the shot string before?

 

[Hynzie]

Good post good luck HYNZIE 4s