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Enthusiast ![]() ![]() ![]() ![]() Joined May 16, '10 From Raleigh Currently Offline Reputation: 12 (100%) ![]() |
The good: Car starts up and and warms up, and drives great.
The bad: when under load the temp gauge lowers about 1/8th of an inch under heavy boost. I'm only running around 7psi for break in. I also have a tiny coolant leak, very tiny. and a low temp thermostat from ATS. after a few seconds of driving normaly (no boost) the car begins to creep back to normal temp, and it will remain there. Even at a stop light. So I don't know if this leak under boost is causing the temp gauge to read incorrectly. Perhaps an air bubble created from the leak is causing this? Just need some thoughts from you guys. Any advice would be appreciated. Issue #2: When the car is at idle it's reading around 15 vacuum, I'm under the impression that this should be more what 21. From time to time the car will idle around 1100, and when it does the vacuum is at around 20. The idle will drop to about 600 when the car reads 21. Scenario: I stop at stop light car idles at 1100-1200 with vacuum at -20. After about 30 seconds car sputters slightly, and vacuum raises to -15 and idle drops to 600ish. WHAT'S THE DEAL WITH THIS!!! -------------------- ![]() |
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![]() Enthusiast ![]() ![]() ![]() ![]() Joined May 3, '11 From Ohio Currently Offline Reputation: 8 (100%) ![]() |
my experience with blown head gaskets is minimal at best, but I believe you'd be able to smell it... possibly this is what you meant when you said coolant does NOT smell like gas.
If you are loosing coolant but none of it is ending up on the ground, one must consider the possibility that it's being burnt. But making sure it's being burnt inside the cylinders and not say, dripping onto the exhaust headers for instance is going to be the challenge. If you aren't loosing coolant, then it could just be a bad burp of the system. The most intriguing thing for me is the fact that it happens while under heavy boost? And how that whole thing effects your vacuum.... Something to think about because I admittedly am unsure of the full working mechanics of the coolant in relation to the vacuum and your hoses is this. Any fluid with increased traveling velocity has a decrease in pressure in comparison to its slower moving counter part. This is a simple concept of Bernoulli's equation and is generally applied to pipe flow with different diameters and an incompressible fluid, a perfect assumption for a motor with many different diameters of pipe. So when you really lay into the throttle, and the water pump starts putting more and more pressure on the coolant system to move a larger volume of water through the engine in a given time, the faster that fluid moves. I have no idea if that bit of information helps you find what you are looking for, but if there was an air bubble in the system, that kind of velocity and vacuum would certainly compress the air bubble and change the internal characteristics of the pressure of the system in my mind. Oh and 5s block or 3s block? -------------------- ![]() |
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Lo-Fi Version | Time is now: February 21st, 2025 - 1:45 PM |