Check Valve - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Methanol/Water Injection Place to talk about meth/water injection.

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 02-04-2008, 08:59 AM   #1
Junior Member
Thread Starter
iTrader: (2)
 
Join Date: Oct 2007
Location: Louisville, KY
Posts: 419
Total Cats: 9
Default Check Valve

Just a word of advise for other cheap bastards like me....

Being that I am running a SC and my WI nozzle is in the intake, post TB, I need a check valve. Well I was a cheap bastard and refused to pay $30 for a check valve and ordered one through McMaster-Carr. I thought I was getting a killer deal for $6.

Well I fired the car up yesterday and watched the fluid in my tank drop as my car spewed water out the tailpipe. Now this is with my car idling. Obviously the check valve was not working.

My problem was that I order a check valve with a cracking pressure of 0.5psi. With 10ish psi of vacuum, the check valve was open all the time.

Moral to the story...

If you are specing a check valve, be sure to spec one with a cracking pressure of 15-20 psi.

I am going to do some calling around today and see if any of the local hydraulic stores have one in stock. Needless to say, my tuning session last night was cut short. I could tune sub 100kpa, but once I ran into boost a few times, I saw intake temps in the 230*F range. A little hot!
fourwhls is offline   Reply With Quote
Old 02-04-2008, 09:22 AM   #2
Junior Member
iTrader: (1)
 
Join Date: Jul 2006
Location: Colorado
Posts: 403
Total Cats: 2
Default

I went one better and just got a solenoid and wired it with the pump, pump on valve open, pump off valve closed.

It was $50 though
Chris Swearingen is offline   Reply With Quote
Old 02-05-2008, 10:14 AM   #3
Junior Member
Thread Starter
iTrader: (2)
 
Join Date: Oct 2007
Location: Louisville, KY
Posts: 419
Total Cats: 9
Default

Quote:
Originally Posted by Chris Swearingen View Post
I went one better and just got a solenoid and wired it with the pump, pump on valve open, pump off valve closed.

It was $50 though
Chris,
I would have liked to use a solenoid valve, but being that I am using a progressive controller, I have no way to control it.

If I had a on/off system, it would have been great. I ended up buying a check valve from devil's own. A check valve with that high of a cracking pressure is pretty uncommon. I tried to find something locally and nobody had anything close.
fourwhls is offline   Reply With Quote
Old 02-08-2008, 01:48 AM   #4
Senior Member
iTrader: (6)
 
Join Date: Mar 2005
Location: Sammamish, Washington
Posts: 1,396
Total Cats: 0
Default

I have one of the older style DO checkvalves you can have for $5 shipped if you need it.
Kelly is offline   Reply With Quote
Old 02-08-2008, 08:36 AM   #5
Junior Member
Thread Starter
iTrader: (2)
 
Join Date: Oct 2007
Location: Louisville, KY
Posts: 419
Total Cats: 9
Default

I appreciate it, but I ordered one earlier this week from DO. It was a little bit of a fiasco getting it here, but it finally arrived yesterday.
fourwhls is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 59 12-15-2017 09:00 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Any pnp megasquirt for 2001 Big_gumby WTB 0 09-30-2015 04:34 PM
Another Alternator thread ihiryu General Miata Chat 9 09-28-2015 11:22 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 07:39 PM.