stunthanger.com
Speed,Combat,Scale,Racing => Rat Racing and Team Racing => Topic started by: frank mccune on January 20, 2020, 03:36:57 PM
-
Hello All:
How much pressure is generated by using timed and untimed crankcase pressure when using a pressure fuel system?
Perhaps the answers shoul be psi.
Tia,
Frank McCune
-
I recently read an article by Bill Lee from an old magazine. I believe it was about 1PSI with no check valve. 1.25 with. Doesn't sound like much, but it's still an increase! I may be wrong, however....
Sent from my SM-G960U using Tapatalk
-
I recently read an article by Bill Lee from an old magazine. I believe it was about 1PSI with no check valve. 1.25 with. Doesn't sound like much, but it's still an increase! I may be wrong, however....
Sent from my SM-G960U using Tapatalk
That's pretty close, T.J.
What I wrote was
" ... a test stand to measure this and found that the tank
pressure from an untimed crankcase tap is about I.4
psi, or about 1.6 psi if a ball-check is used in the
pressure line."
Yes, this is crankcase pressure, not timed pressure, but what most folks would use.
Bill
ps; this may be found on the NCLRA website at http://www.nclra.org/TechTopics/UniflowPhysics.pdf
-
Not bad for not going back to look it up! Hahahaha!
Thanks for the correction!
Sent from my SM-G960U using Tapatalk
-
I have never liked timed pressure .most times don't use a check valve
-
Timed pressure is allot more, so much it will make your needle valve very sensitive. I use check valves I make myself on un-timed pressure but they need constant flushing out with straight methanol. Any dried oil gets in there you're done.
Motorman 8)
+1
-
Timed pressure is allot more, so much it will make your needle valve very sensitive. I use check valves I make myself on un-timed pressure but they need constant flushing out with straight methanol. Any dried oil gets in there you're done.
Motorman 8)
I have enjoyed your input over the years. Do you consider yourself a current competitor or retired? I have not seen you
at the Nats in my 32 years since re-entering and attending the C/L racing Nats
.