Prometheus Spring installation

SN1P3R 808 · March 22nd, 2008, 01:35

I've notice this spriing is compress more one side. Do you know what side goes in the spring guide.

yanhchan · March 22nd, 2008, 01:42

The side that has more coils....

SN1P3R 808 · March 22nd, 2008, 01:58

Thanks!

CDN_Stalker · March 22nd, 2008, 09:58

Ya, the tighter coils go on the spring guide side.

Crunchmeister · March 22nd, 2008, 12:19

Just out of curiosity, what happens if you install the spring backwards? I've got the MS110SP in 2 of my guns, and have it installed correctly, but was wondering what effects it has if it's installed backwards.

CDN_Stalker · March 22nd, 2008, 12:54

Typically a lower fps, sometimes as much as 30fps drop.

Crunchmeister · March 22nd, 2008, 13:18

Hmmm... I'm 99% positive I did install the spring correctly in my M15 rifle, yet only getting 350 fps out of it, where I should be getting in the 380 range. This could be the problem... I'm about to order a new tappet plate and nozzle for it, so I'll be sure to check that out when I do.

EDIT: Just removed the upper receiver to check out the M15. Seems the spring is installed correctly. Looks like I'll be doing more troubleshooting when I get my new parts.

CDN_Stalker · March 22nd, 2008, 14:04

Possible airleak I guess.

Crunchmeister · March 22nd, 2008, 14:21

That's what I suspect. I had really good compression when holding my finger on the nozzle and pushing the piston. But because I didn't know I had to stretch the Systema piston head o-ring, I reused the stock CA one. That may be the problem. I'll be fixing that once I receive my new parts.

But even as it is now, 350 fps isn't bad. It's a nice improvement over the stock 300-ish performance. But it should be more than that.

yanhchan · March 22nd, 2008, 14:30

Over time air seal degrades once in a while regrease/replace o rings. Good luck to ya! Could also be the hop up rubber being worn out!

Crunchmeister · March 22nd, 2008, 14:37

Quote:

Originally Posted by yanhchan

Over time air seal degrades once in a while regrease/replace o rings. Good luck to ya! Could also be the hop up rubber being worn out!

I've replaced the piston, piston head, cylinder head and spring guide with Systema parts. A Systema nozzle and tappet plate are on the way, as well as new Systema hopup rubber. I'll see how it goes when I get those parts installed. Thanks for the tip though. All suggestions are welcome. I'm a noob, so any and all help is appreciated.

dragwindsor · March 22nd, 2008, 15:08

Crunch.... Do youi have a 110 in your 416? If so, what is the FPS? I'm putting in my Pro ms100 today. Thanks.

Crunchmeister · March 22nd, 2008, 15:16

My 416 is completely stock. Only add-ons I have are external. I have the 110 spring in both my M15 and C8. Don't know what velocity my C8 gets, as the mechbox cracked after about 200 shots. Seemed pretty powerful after the upgrade though.

BTW, with use, the spring settles down nicely in the 416. I chronied it again last night after having used it a bit and velocity is now down in the 400 fps range. Sepulcrum's has seen a lot of shooting and his has settled down to the 370 range.

dragwindsor · March 22nd, 2008, 15:20

Sweet. I can probably use my stockie for outdoor then eh? I have Harbinger's stock TM in there now and it's chroony'n 340-350, I just got my Pro m100 in, I hope it stays under 350.

CDN_Stalker · March 22nd, 2008, 17:03

I've actually gotten into the habit of streching ALL the piston head O-rings, and get really good results even from stock TM heads now.

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March 22nd, 2008, 01:35	#1
SN1P3R 808 Trader rating Join Date: Feb 2008 Location: HAWAII	Prometheus Spring installation I've notice this spriing is compress more one side. Do you know what side goes in the spring guide. __________________ My TM MP7A1 & CA B&T MP5A3 TM MP7A1 Mini Gearbox Disassembly Guide

March 22nd, 2008, 01:42	#2
yanhchan Trader rating Join Date: Jun 2005 Location: Scarborough/Richmond Hill ON	The side that has more coils.... __________________ YANHCHAN'S AIRSMITHING: AEG repair/Tune up/Upgrades V2/V3 mechboxes, rewiring/reconnecting. Ask not what your country can do for you; ask what you can do for your country ~John F. Kennedy

March 22nd, 2008, 01:58	#3
SN1P3R 808 Trader rating Join Date: Feb 2008 Location: HAWAII	Thanks! __________________ My TM MP7A1 & CA B&T MP5A3 TM MP7A1 Mini Gearbox Disassembly Guide

March 22nd, 2008, 09:58	#4
CDN_Stalker Official ASC Bladesmith Trader rating Join Date: Jul 2003 Location: Ottawa, Ont.	Ya, the tighter coils go on the spring guide side. __________________ STKR Knives http://www.facebook.com/#!/pages/STK...17036668380871

March 22nd, 2008, 12:19	#5
Crunchmeister Trader rating Join Date: Nov 2007 Location: In your bedroom going though your underwear drawer	Just out of curiosity, what happens if you install the spring backwards? I've got the MS110SP in 2 of my guns, and have it installed correctly, but was wondering what effects it has if it's installed backwards. __________________

March 22nd, 2008, 12:54	#6
CDN_Stalker Official ASC Bladesmith Trader rating Join Date: Jul 2003 Location: Ottawa, Ont.	Typically a lower fps, sometimes as much as 30fps drop. __________________ STKR Knives http://www.facebook.com/#!/pages/STK...17036668380871

March 22nd, 2008, 13:18	#7
Crunchmeister Trader rating Join Date: Nov 2007 Location: In your bedroom going though your underwear drawer	Hmmm... I'm 99% positive I did install the spring correctly in my M15 rifle, yet only getting 350 fps out of it, where I should be getting in the 380 range. This could be the problem... I'm about to order a new tappet plate and nozzle for it, so I'll be sure to check that out when I do. EDIT: Just removed the upper receiver to check out the M15. Seems the spring is installed correctly. Looks like I'll be doing more troubleshooting when I get my new parts. __________________ Last edited by Crunchmeister; March 22nd, 2008 at 13:30..

March 22nd, 2008, 14:04	#8
CDN_Stalker Official ASC Bladesmith Trader rating Join Date: Jul 2003 Location: Ottawa, Ont.	Possible airleak I guess. __________________ STKR Knives http://www.facebook.com/#!/pages/STK...17036668380871

March 22nd, 2008, 14:21	#9
Crunchmeister Trader rating Join Date: Nov 2007 Location: In your bedroom going though your underwear drawer	That's what I suspect. I had really good compression when holding my finger on the nozzle and pushing the piston. But because I didn't know I had to stretch the Systema piston head o-ring, I reused the stock CA one. That may be the problem. I'll be fixing that once I receive my new parts. But even as it is now, 350 fps isn't bad. It's a nice improvement over the stock 300-ish performance. But it should be more than that. __________________

March 22nd, 2008, 14:30	#10
yanhchan Trader rating Join Date: Jun 2005 Location: Scarborough/Richmond Hill ON	Over time air seal degrades once in a while regrease/replace o rings. Good luck to ya! Could also be the hop up rubber being worn out! __________________ YANHCHAN'S AIRSMITHING: AEG repair/Tune up/Upgrades V2/V3 mechboxes, rewiring/reconnecting. Ask not what your country can do for you; ask what you can do for your country ~John F. Kennedy

March 22nd, 2008, 15:08	#12
dragwindsor Trader rating Join Date: Feb 2008 Location: Windsor, Ontario	Crunch.... Do youi have a 110 in your 416? If so, what is the FPS? I'm putting in my Pro ms100 today. Thanks. __________________ To save the trouble of Ancorp reading it in every post: Inokatsu

March 22nd, 2008, 15:16	#13
Crunchmeister Trader rating Join Date: Nov 2007 Location: In your bedroom going though your underwear drawer	My 416 is completely stock. Only add-ons I have are external. I have the 110 spring in both my M15 and C8. Don't know what velocity my C8 gets, as the mechbox cracked after about 200 shots. Seemed pretty powerful after the upgrade though. BTW, with use, the spring settles down nicely in the 416. I chronied it again last night after having used it a bit and velocity is now down in the 400 fps range. Sepulcrum's has seen a lot of shooting and his has settled down to the 370 range. __________________

March 22nd, 2008, 15:20	#14
dragwindsor Trader rating Join Date: Feb 2008 Location: Windsor, Ontario	Sweet. I can probably use my stockie for outdoor then eh? I have Harbinger's stock TM in there now and it's chroony'n 340-350, I just got my Pro m100 in, I hope it stays under 350. __________________ To save the trouble of Ancorp reading it in every post: Inokatsu

March 22nd, 2008, 17:03	#15
CDN_Stalker Official ASC Bladesmith Trader rating Join Date: Jul 2003 Location: Ottawa, Ont.	I've actually gotten into the habit of streching ALL the piston head O-rings, and get really good results even from stock TM heads now. __________________ STKR Knives http://www.facebook.com/#!/pages/STK...17036668380871

Prometheus Spring installation

Upgrades & Modifications