Nice!So Firewalker cut and crowned an FX liner for my 380mm barrel kit from C88machining. I also ordered c88's plenum and plenum extension. I already had a gauge block from Wes @ Airgunarcheryfun.ca and decided to keep it on there.
Man oh man, it was close to not fitting but it fits.
View attachment 461099
Moderator is close to the airtube but doesn't touch, about 1mm of clearance.
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Overall length is now 36-1/2" as I use it with the stock extended and a Donny FL Tanto on the end. And it still feels light!
It weighs, as you see it, 5lbs 1oz according to my kitchen scale. Scoping it will put it over 6lbs but will be worth it.
Here is the kit laid out as I got it from Firewalker after he cut the barrel and assembled the kit for testing.
He and c88machining both did a great packing job on the parts.
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Just did some testing and it looks like I gained 50 fps while still having 4mags before I drop off the reg. Nice!
CPHP were doing 825fps for 21.6 FPE and are now going 875fps for 24.32 FPE. H&N Slug HP .218 were going 675fps before and now are going 730fps.
Without a re-zero while doing chronograph testing, I was hitting my spinner about an inch up and to the left.
Finding accuracy should be a breeze.
Famous last words, lol.
I just checked it Matt, it’s 8.85cc
I’ve got a plenum ready to be threaded if usps does their part tomorrow. I suppose we’ll see. Appreciate the analysis . Hopefully have some numbers soon. I have a feeling this thing's going to need a bigger boat….. I mean tank, lol.
Dave
I’ve got a plenum ready to be threaded if usps does their part tomorrow. I suppose we’ll see. Appreciate the analysis . Hopefully have some numbers soon. I have a feeling this thing's going to need a bigger boat….. I mean tank, lol.
Dave
And yes, stock barrel with added plenum, with my other mods I mentioned earlier in thread.@sb327 - What's the reason for having the reg so high? I was wondering if your creep is related.
Are you running a stock barrel and just a plenum?
Nice! I just went back and looked at your other mods.And yes, stock barrel with added plenum, with my other mods I mentioned earlier in thread.
The set point change may very well be from the higher setting. Keep in mind though, I’m probably one of the few who have actually measured the output of the factory regulator and I’m doing it with a digital gauge which is overly accurate for most applications. If it’s cool outside, just holding the plenum in your hand will warm it up and make a decent pressure jump.
Dave
Running the reg that ‘high’ is just a random number to experiment with. 2600 isn’t that high to me. If you consider an unregulated gun, the initial point is a lot higher. To make power with short barrels, higher pressure is a way to do that.
This gun is only an experiment and will undoubtedly be tuned way back. A lighter hammer will be tested at some point as well. Something to do inside during this rainy season here.
Dave
Nice! I just went back and looked at your other mods.
I was trying to up power while maintaining shot count but I didn't get near the power increase you have for obvious reasons.
Looks like it's time to do some porting and see if I can find the happy medium of fps and shot count....