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RX-7 2nd Gen Specific (1986-92) RX-7 1986-92 Discussion including performance modifications and technical support sections. |
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05-15-2009, 03:58 PM | #1 |
RCC Loves Me Not You
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20PSI Radiator Caps
thoughts?
Will running one cause coolant to push pass the coolant rings on the engine? Or will the rings be fine?
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The Official FC Radiator Thread My Project Thread: Cerberus CCVT Virginia Rotary Group |
05-15-2009, 10:37 PM | #2 |
RCC Addict
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Don't do it.
At that high cooling system pressures, you get LOTS of leaks! -Ted |
05-15-2009, 11:22 PM | #3 | |
RCC Loves Me Not You
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Quote:
Since you're running the same AFCO radiator as me, do you have a preference for the cap you run on yours?
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The Official FC Radiator Thread My Project Thread: Cerberus CCVT Virginia Rotary Group |
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05-16-2009, 03:54 AM | #4 |
Test Whore - Admin
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Yeah, pressure is way too high. Id imagine you'll find a few external leaks but it'll put unneeded pressure on the coolant seals. No need to up the pressure. Upping the pressure raises your boiling point. Raising the boiling point is beneficial on really hot running engines. We know these engines don't like to run hot. Standard 1 bar cap.... I'm using a 13 psi cap, will be fine.
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-The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. -Angry Motherf*cker Mode ENGAGED- |
05-16-2009, 04:21 AM | #5 |
RCC Addict
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I couldn't tell if there were internal leaks, but I saw a LOT of external ones!
You can get one of those cooling system pressure testers and see for yourself. Everytime I tried over 20psi, coolant started leaking from the damndest places! -Ted |
05-16-2009, 08:30 AM | #6 |
RCC Loves Me Not You
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that's really peculiar to me. I've been running the 20 psi bar for the past few days and have been able to isolate and fix all the external leaks. When I idle the temperature gets up to regular temps but then will immediately start to cool. The E-fan will actually kick off which is something it never did with the old radiator and pressure cap. My Engine temps have been cooler too. Whether that's from the radiator or benefits of the cap I don't know. In the mean time I'll pick up a new radiator cap and see if I can't find me a recirculatory tank some where.
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The Official FC Radiator Thread My Project Thread: Cerberus CCVT Virginia Rotary Group |
05-16-2009, 09:45 PM | #7 |
Test Whore - Admin
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I don't see how a higher PSI cap would increase the cooling effects of the other parts, but I could be wrong.
As for the recirclating tank..... you got access to a TIG, build your own. Unless you want me to start calling you names
__________________
-The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. -Angry Motherf*cker Mode ENGAGED- |
05-16-2009, 11:58 PM | #8 | |
RCC Loves Me Not You
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Quote:
It was my understanding that a higher PSI rating allowed thermal transfer easier through the aluminum. I too, could be wrong... but I will do a google search and see what comes up. http://www.stewartcomponents.com/tec...ech_Tips_2.htm That's about the most helpful link I could find in the five minutes of searching. My theory is this: As the engine heats, the heat is then absorbed by the coolant. As the coolant takes on that heat it begins to become less dense, and by effect become less able to absorb the heat coming from the engine. As the coolant gets to the boiling point, it builds pressure. This pressure forces the heat from the engine to continue to be absorbed at a specific rate. Once the peak pressure of the cap is reached, it vents it to the recirc tank and the process starts all over again. The theory stays the same for high pressure (20 PSI, which I assume is absolutely safe for the engine since Pineapple racing tests their cooling systems to 20PSI to check for leaks). Since the pressure is higher than stock the boiling point of the coolant is raised, which allows heat to transfer from the hotter source (the engine) to the still liquid coolant. Once that is then pushed to the radiator more molecules are packed to the cooling fins thus rejecting the newly absorbed heat, ergo a cooler engine. This is of course just a theory, and I do not have the funds as of right now to fully test it. But if some one does test it I would like to hear the results. I had tons of external leaks when I first started using it. Everything from an adapter being pushed out, to a hose bursting (it was old and already worn). Yet as soon as I fixed all those leaks it seemed to work quite well. I have to drive back down to blacksburg tomorrow because I forgot a few important things for the internship, so I'll report back on the temps of the 13lbs (.8 bar). From what I noticed just on this trip up to Culpeper my temperatures were slightly hotter than what I was used to driving around town with the 20lbs (1.something bar), though temps never seemed to stay around 200F for very long and usually fell sharply after the hill climbs back down to 180-190F.
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The Official FC Radiator Thread My Project Thread: Cerberus CCVT Virginia Rotary Group |
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