Regulated FAC R7 (not mk1) low shot count

[Squinty]

you tryed shot count on a 220 bar fill.even when reged they use different amounts of air per shot.seam to use les at beginning of fill than lower down.as a guide a standard fac mk2 reged does around 70 shots at around 910 fps with 16 grn.on a 19 inch barrel
KevG

Still not sure exactly what was going on to start with besides what you said about there being more shots from the top-end of the fill.

I have been genuinely thinking that I screwed up big-time with this conversion so not wishing to waste more air emptying 480cc bottles I used a 400cc aluminium at 200bar, Either it came good or I would be stuck with an over-ported bodge.

Anyway  the chrono results were 55 shots 945fps +/- 5fps  31.75ft/lbs from a 200bar fill.
20bar increase ...35 shots extra

whats confusing me (again) .....I took the full length spring out as was rather rather hot, put the shorter spring back in and its making an extra 20fps with the adjuster still backed out to the stock

[KevG]

some times to much hammer spring can lower power.its caused by hitting stem so hard the stem spring can coil bind and in turn throws back faster so in theory less valve time.
KevG

[Squinty]

whoops, a close shave!
I took it apart again before the latest trial, double-double checked the valve and habitually changed the o-rings.
Appears to be undamaged.

If that's the case the short stem-spring you supplied with the valve and pre-chamber extension is right on its compression limit?

Stiil not sure how/why I'm getting a different output from the same hammer spring tho, before it was wound in fully and dropped on backing off...now its 4mm further out.

[KevG]

should be a standard length around 19 mm
KevG

[Squinty]

I'm not picking fault Kev, brain was fried on this one, I had a mk2 fast-flow and valve on the table waiting

I don't want to take it apart again to check it 

[KevG]

that looks very good now.480cc bottle with 220 bar fill will give outstanding numbers i should think.
KevG

[Daztilley]

My 500cc carbon fibre bottle is rated to 300bar and a theoben reg should handle 250bar- might be worth trying 240bar to increase the shot count further....... you would get less fills from your charging cylinder though....

Just a thought .....

[Squinty]

I have Inocom 480cc bottles  (DS - FX ect), rated  250 bar, didn't plan on going over 220-230 to be honest.

Hopefully the 80-90 shots will free up the spare I carried when it was fast-flow.
Although I now have three custom high-flow bottle valves that are overkill for a reg....