NITROUS OXIDE ( nos / n2o ) advice forum

Nitrous Oxide ( NOS / N20 ) Forum
 
It is currently Sat Nov 17, 2018 12:51 pm

All times are UTC




Post new topic Reply to topic  [ 5 posts ] 
Author Message
 Post subject: Why Jet at the Outlet?
PostPosted: Sun Apr 23, 2017 2:24 am 
Offline
Learner

Joined: Sat Aug 08, 2009 7:10 am
Posts: 59
Location: Colorado
I understand jetting at the solenoid obviously -- but why at the outlet instead of the inlet?

Seems jetting at the inlet would reduce the pressure the solenoid has to operate against which would allow even greater range of response with lower starting percentages at higher pulse rates.

So I must be missing the reason this isn't done.....


Top
 Profile  
Reply with quote  

Advertisement

Wizards of NOS Conact US
 Post subject: Re: Why Jet at the Outlet?
PostPosted: Mon Apr 24, 2017 12:30 am 
Offline
Wizard
User avatar

Joined: Sat Mar 21, 2015 8:13 pm
Posts: 968
Location: Orlando, Fl in 'Merrrrica!
fj1289 wrote:
I understand jetting at the solenoid obviously -- but why at the outlet instead of the inlet?

Seems jetting at the inlet would reduce the pressure the solenoid has to operate against which would allow even greater range of response with lower starting percentages at higher pulse rates.

So I must be missing the reason this isn't done.....

I'll have more info on this, but for now one main reason for not reaching new heights with Pulsing current X10's is the REVO. It's far superior and eliminates ANY need for pulsing AT ALL. Progressive power can be had from 0% to 100% and virtually anything in between those two values.


Top
 Profile  
Reply with quote  
 Post subject: Re: Why Jet at the Outlet?
PostPosted: Tue Apr 25, 2017 11:28 pm 
Offline
Wizard
User avatar

Joined: Sat Mar 21, 2015 8:13 pm
Posts: 968
Location: Orlando, Fl in 'Merrrrica!
Jetting at the inlet of the Pulsoids would pose some problems that jetting at the outlet avoids. Even IF relocating the jet increased the frequency response, the loss of metering accuracy would suffer and precise metering is ESSENTIAL in performance of the system as a whole.

One of many reasons I'll give here is that the volume of the Pulsoid's inner chamber is an additional space that would have to be filled with liquid nitrous to therefore be sent out through the pipework and to the engine. With the piston (or plunger as it's often called) opening and closing, the process of purging out all of the gas would be significantly SLOWER and the flow would be highly INCONSISTENT as the liquid nitrous, disturbed by the piston actuation, would have the opportunity to change phase into a gas and compound the problem. This problem is far worse with smaller jettings as the Pulsoid would then continuously heat up, resulting in further phase change and potential overheating of the coil.

Pulsoid frequency response increases would have to take place in a new design rather than a band aid. With the REVOs being available, the point is moot.


Top
 Profile  
Reply with quote  
 Post subject: Re: Why Jet at the Outlet?
PostPosted: Thu Apr 27, 2017 5:04 am 
Offline
Learner

Joined: Sat Aug 08, 2009 7:10 am
Posts: 59
Location: Colorado
Makes sense -- basically it's the expansion issue rearing its ugly head in a different manner. Knew there had to be a reason I was missing. Thanks


Top
 Profile  
Reply with quote  
 Post subject: Re: Why Jet at the Outlet?
PostPosted: Wed Jun 14, 2017 9:59 pm 
Offline
Site Admin

Joined: Thu Feb 03, 2005 6:07 pm
Posts: 18701
Location: Doncaster
Yes expansion (phase change from liquid to gas), into a much larger volume after the jet, is one of the reasons for my choice of jet location but there is another equally important reasons, which is contrary to your expectations.
Although, a lower working pressure would enable the plunger (piston), to lift more easily, it would also SLOW DOWN the return (shut off) of the plunger, which is equally as important as the opening time. Ideally we want the plunger to follow the square wave electrical signal, to give the most accurate results but what we actually get is a ramped opening and a ramped closing time, which effectively increases the flow through the system, beyond that set in the progressive controller.
To achieve optimum pulsed response from any solenoid, virtually EVERY paramater of the solenoid design (and to some degree other aspects of the system), needs to be adjusted to optimum settings. This is not a practical option, so I and my team determined the optimum design settings, for what we felt were going to be the majority of applications and then gave, as much adjustment either side of that as we could.
Despite having done all that, I doubt even 0.00001% of our customers, have ever bothered to utilise those facilities and that I guess, is a testimony to how well we determined the baseline settings.

_________________
Regards

Trev (The WIZARD of NOS)

30 years of nitrous experience and counting!!!!


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 5 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

  • Advertisement
Wizards of NOS Sparkplugs
Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group  
Design By Poker Bandits