Go Back  RX7Club.com - Mazda RX7 Forum > Tech and Performance > Single Turbo RX-7's
Reload this Page >

Parallel fuel system with pulsation dampers. Check it out.

Single Turbo RX-7's Questions about all aspects of single turbo setups.

Parallel fuel system with pulsation dampers. Check it out.

Old 03-11-09, 07:02 PM
  #26  
Rotorhead
 
Evil Aviator's Avatar
 
Join Date: Feb 2001
Location: Charlottesville, Virginia, USA
Posts: 9,136
Likes: 0
Received 21 Likes on 16 Posts
Originally Posted by TweakGames View Post
I was under the impression that the FPR had a built in pulsation dampener...... But I seem to be having trouble finding any information that says that....... hmmmm...
The top-quality SX FPRs act as a pulsation dampener. FYI most of the Aeromotive products are made or designed by SX.
http://www.sx-performance.com/15402.PDF
"We use Fluorosilicone diaphragm material, formally used only on aerospace components. This material is capable of long life (longer than competitor's Nitrile or rubber based "cheap" diaphragms), and has a high resistance to chemical attack.

Light weight diaphragm allows the regulator to act as an accumulator. Not only does this feature help prevent system chatter and noise, but also acts as a pulsation dampener, to help maintain consistent fuel pressure."


Marren products are not aerospace grade, and therefore pulsation dampeners are probably a good idea if you use their cheaper components.

Originally Posted by FrankV702 View Post
I have heard that you need to cover them because dirt and stuff will work it's way in there over time. I just wouldn't know what to cover them with.. ??
Mine are covered with dirt and stuff.
Evil Aviator is offline  
Old 03-11-09, 09:57 PM
  #27  
1.3 liter piston eater
5 Year Member
Thread Starter
iTrader: (2)
 
boostedfc3s's Avatar
 
Join Date: Nov 2005
Location: Cheyenne,WY
Posts: 382
Likes: 0
Received 0 Likes on 0 Posts
Thanks Evil. That's some good to know info. I guess I'm extra super nuclear safe from pulsation problems then huh ?
boostedfc3s is offline  
Old 03-12-09, 03:23 AM
  #28  
Rotorhead
 
Evil Aviator's Avatar
 
Join Date: Feb 2001
Location: Charlottesville, Virginia, USA
Posts: 9,136
Likes: 0
Received 21 Likes on 16 Posts
Originally Posted by boostedfc3s View Post
Thanks Evil. That's some good to know info. I guess I'm extra super nuclear safe from pulsation problems then huh ?
Well, you did originally state "Maybe overkill, but I'd rather be safe than sorry". Plus, it looks pretty cool IMO.
Evil Aviator is offline  
Old 03-12-09, 12:44 PM
  #29  
Rotary Freak
10 Year Member
iTrader: (14)
 
Julian's Avatar
 
Join Date: Jan 2004
Location: Longview, Texas
Posts: 1,855
Likes: 0
Received 1 Like on 1 Post
I too use the Marren Damper with an SX Pressure Regulator. I do not have dual feed fuel lines thus only use the single Damper however; I too would have put in two dampers if I used a parallel dual feed system, based on experience in my past life as a hydrodynamicist.

I stayed single feed only due to: 1) I am not running the power or flow rates to justify and 2) as a consequence of 1 (staying sequential et.al.), I do not have the room for such gear. As it is, I went down a simple path of just upgrading injectors, I decided I’ll refresh the engine bay fuel system with all new OEM parts while under the UIM. Then went to what the hell another $1,500 later (after spending $1600 just on new injectors (MMS), mod’s by RC and independent flow testing by Yaw Power) with one simple hell as I am down here may as well upgrade the OEM Pulsation Damper. Now gone to FPR, Goodridge Super flex 910 Kevlar w/ Teflon smooth bore fuel lines, etc, etc.

As to a Pulsation Damper need in an RX-7; who really knows .. but I will add these comments:
1) our cars run high rpms, creating very high frequency injector pulsing,
2) they batch fire, again increasing pulsation frequencies,
3) the primary and secondary rails are separated so even if the FPR provides some high frequency damping (it obviously does low frequency by its very nature) it is a very long way from stopping primary pulses from creating shock waves,
4) Mazda tried to save weight and $ in this cars development. The engineers could have easily given up the PD to save on both accounts but they held out for its need and maybe the accountants influence created the use of a PD without a 10-15 year life,
5) Not every EFI car uses a PD but many hi performance cars do including models by Porche and BMW.
Julian is offline  
Old 03-12-09, 01:32 PM
  #30  
4th string e-armchair QB
5 Year Member
iTrader: (11)
 
Trots*88TII-AE*'s Avatar
 
Join Date: May 2005
Location: North Bay, Ontario
Posts: 2,745
Likes: 0
Received 0 Likes on 0 Posts
Very nice setup, there's a good writeup about parallel fuel setups on TeamFC3S and needing FPD's. Only thing to add is I think it would be more advantageous to have the FPD's on the feed side, and having the FPR on the return side, you would get the best of both and never have an issue. I'm sure that many FPR's do have pulsation dampening built in to them, but it's not what they're designed to do and wouldn't do as proper of a job as a dedicated FPD. This is just my opinion, I don't have any facts about FPR's abilities to damper pulsations.
Trots*88TII-AE* is offline  
Old 03-13-09, 12:29 AM
  #31  
1.3 liter piston eater
5 Year Member
Thread Starter
iTrader: (2)
 
boostedfc3s's Avatar
 
Join Date: Nov 2005
Location: Cheyenne,WY
Posts: 382
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Trots*88TII-AE* View Post
Only thing to add is I think it would be more advantageous to have the FPD's on the feed side, and having the FPR on the return side, you would get the best of both and never have an issue.

Thanks for the compliment. My original plan was to mount the PD's directly to the end of the rails, but there is not enough room. On the front the water neck was to close and at the back the firewall was to close. ( secondary rail of course ) So I called Marren about mounting them remotely like I did. They said that you can plumb them on either side of the rails, but they are more efficient if plumbed after the rails. Since it was easier to mount them to the firewall, it worked out best to do like they said and go after the rails. I have heard of them being plumbed before the rails and they do their job that way too.
boostedfc3s is offline  
Old 02-22-10, 07:28 PM
  #32  
lite rotary = easy push
iTrader: (1)
 
barnett87rx7's Avatar
 
Join Date: Mar 2009
Location: Whitby
Posts: 1,379
Likes: 0
Received 0 Likes on 0 Posts
sorry to open an old thread but what ar you using for a source of vacuum for your fpr since you got the usual place capped off on the LIM
barnett87rx7 is offline  
Old 02-22-10, 09:12 PM
  #33  
whats going on?
iTrader: (1)
 
SirCygnus's Avatar
 
Join Date: Mar 2004
Location: atlanta ga
Posts: 4,885
Likes: 0
Received 4 Likes on 4 Posts
Originally Posted by barnett87rx7 View Post
sorry to open an old thread but what ar you using for a source of vacuum for your fpr since you got the usual place capped off on the LIM
anyplace that sees vac from both rotors.
SirCygnus is offline  
Old 02-23-10, 03:35 PM
  #34  
Rotary Enthusiast
 
ronbros3's Avatar
 
Join Date: Jun 2004
Location: Austin TX.
Posts: 862
Received 0 Likes on 0 Posts
anyone got a list of blown engines contributed from fuel pulsation.
ronbros3 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
82streetracer
1st Generation Specific (1979-1985)
7
08-23-15 09:28 AM


Thread Tools
Search this Thread
Quick Reply: Parallel fuel system with pulsation dampers. Check it out.


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: