Irregular Pitch Spring Installation
 

Does it matter which direction I install my irregular pitch spring? I have a basic mechanical knowledge of the mechbox workings and I can't think of a reason it would matter.

Thanks in advance. (I did a search and could not find anything)

Install it with the more compressed coils at the spring guide end. Otherwise you'll get lower fps than expected.

Thanks.

I have seen this error more than once. It's been one of the first things I check by default when I open a gearbox. I had another case on the last gun I worked on.

Maybe this should be sticky'd?

I've seen it a few times as well. Heck, last year when Kokanee got his M14, he asked me a bunch of questions about upgrades and that was one of them.

Close call for me, too, if it weren't for this thread. You'd think Prom would, I don't know, tell us these things.

Hate to plug my own thread but:

Could someone make this a sticky thread or move the content to a sticky thread? I keep forgetting the info in this thread.

Thanks

You mean Prometheus? What about any of the other spring makers? It should be documentation that comes with all springs.

ANY non-linear pitch spring, regardless of maker, regardless of airsoft gun, including bolt action springs. Tighter wound coils at the rear always.

I just was wondering what he meant by "Prom". I know about the coils thing, I was just saying they should include documentation for people that don't know. But maybe people that don't know shouldn't be taking apart an AEG!

i've heard the opposite
http://www.airsoftcanada.com/showthr...tightly+coiled
"Make sure the tightly coiled end of the spring goes towards the piston."
i messed it up once and i was getting about 280 fps out of a 350 fps spring

Sorry, that was incorrectly stated. I've corrected it.

I would've thought my more recent posts regarding the topic would have come up before that post...

I got a 30fps drop by putting the tighter end into the piston before.

I DO agree, there should be a simple diagram on the packaging to show the proper orientation.

My PDI 150% package actually has a small installation diagram on it.. now if only they made their springs as good as their packaging.

That's not the best example because, a PDI is like a box of chocolate... you never know you are going to get.