TAPPING ON PASS. SIDE VALVE COVER????

Bosko5.0 said:

I think its both Its had a tapping since Ive had it, Its ticking when I rev it.

I checked the plugs, they look ok.

I also made a tune and set my rev limiter to 3200 so no more high revs. plus it saves on gas.

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ryclef331 said:

Octane is a measure of how "fast" the fuel burns or it resistance to combustion. The higher the number, the more "stable" or resistant to ignition it is. How does this help or hurt you when timing a vehicle? Well, when you time your ignition, you want the MOST pressure built up and ready to start pushing that piston back down on the power stroke. This also makes the burn sequence last long for a more complete burn and the most power. Make sense? SO you actually START the ignition sequence EARLY before the piston reached absolute top dead center....the piston is still compressing the fuel and air when the spark plug actually fires. Now, if you have a fuel that has a lower octane rating (i.e. burns FASTER), it can actually burn TOO FAST after the SPARK PLUG FIRES and try to push the piston back DOWN while it is still trying to come UP and finish the compression stroke. That is why you want to run a higher octane fuel when advancing the timing. THAT is SPARK KNOCK.

Now Detonation is pre-ignition. The fuel and air actually ignite before the spark plug even fires. This is detonation NOT spark knock. BOTH sound exactly the same but alot of times detonation is caused by alot of things. Too much compression for your fuel's octane (boost also), spark plugs are too hot of a heat range, hot engine parts (valves and piston faces), etc. ALL can cause detonation. WHen you compress something it gets HOT. When you're compression an already unstable mix of fuel and air, too much isn't always the best. The compression of the intake charge can get so great that it heats up to the point of igniting. WHen this happens before the spark plug was supposed ignite it, this AGAIN, tries to push the piston BACK down on its compression stroke.

Detonation, pinging, preignition, spark knock...whatever you call. ALL are the quickest way to a blown motor...HANDS DOWN no matter how built it is.

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