totaly piston slap its fine have had lots thiss bad i fix thiss all the time i whould remove #2 #4 pistons and knurll them and reinstall and noise will be gone the late model 2.2 were bad for thiss as the pistons are very short and the oil ring supply holes get pluged and wears the top side of piston badly. I have this engine in a Sienna. When i ride it it comes hardest at 3500rpm en goes away (or cant hear it) above 5500rpm. By I have tried many oils and found the synthetics and syn-blends 5W-30's from Pennzoil and Valvoline help to mute the startup rattle the best based on my completely subjective and unscientific opinion. Work you kick starter by hand and see if you have any scoring or topend damage on your piston. Eliminating Piston Slap through a Design for Robustness CAE Approach. Step 1: Check the Status of Your Piston . A piston slap is a sound caused by your engines valves moving back and forth. Its not harmful, but it can be annoying and may indicate an issue with one or more cylinders in your vehicle. If you notice piston slap accelerating from idle to higher speeds, this could mean there are faults in the pistons, such as low compression or worn bearings. it goes away when combustion heats up the piston sufficiently to expand it into the bore. This happens when there is a gap between the piston and the cylinder wall. A side benefit was supposedly elimination of piston slap due to the tighter piston-to-cylinder wall tolerances. Still, if the sound is only heard when the engine is cold, it is probably not a serious issue. Piston Slap. Piston slap is a sign that your engine is on its way out. It is caused by the piston hitting the cylinder wall, and it can happen when the engine is cold or has low oil pressure. 05-31-2005, 11:45 PM. Only two things I have found that "helps" or "reduces" it are these. According to Stothers, The How piston slap is avoided? How piston The sound is only on the right side of the bike and most at the top of the engine at the valves. - Hagerty Media Instead of smoothly moving up and down (reciprocally), it comes loose and starts making a horrible noise. Answer: The piston slap occurs due to the excessive gap between piston and its skirts, In some old engines the piston slap occurs while cold starting and goes away when the engine gets warmer, due to the heat the aluminium skirts extends to an extent and dampers the slap noise. Rod knocks are deep, rumbling, knocking sounds emanating from the engine. Just wondering what you 3100 / 3400 guys do to subdue the inevitable piston slap in your cars. It's a repetitive sound and only occurs in that rpm band. This might explain Some of these reasons include bad ignition coils, bad spark plugs, a dirty fuel injector, or a bad spark wire. Piston slap is a noise created by the piston to cylinder wall clearance being excessive, or the cylinder bore being out of round, so the piston skirt slaps in the bore as it travels up and down.. 2003-01-1728. Mar 5, 2014. Piston slap is when the piston rocks or rattles within the cylinder. Piston slap is when the piston rocks or rattles within the cylinder. two, pull your stator cover off and try moving the flywheel up and down to see you have any play in the crank bearings. DO NOT think for one second a heavier weight oil is doing anything to reduce piston slap. Unfortunately, a severe piston slap can only be stopped by rebuilding the engine. But under normal circumstances, here are some of the things you can do to prevent or lessen the slapping noise if the engine is cold. Try using synthetic motor oil with a lower viscosity rating. Piston slap, though annoying, if it goes away when warm its not gonna hurt anything. #14. I've only owned it since February, but it had piston slap when I bought it (From Otto's wholesale lot) In cold (Ottawa) weather, it will 'slap' for 15-20 minutes until the engine is completely warmed up. Piston slap is a problem that plagues many engines. piston slap is not due to a lack of oil as much as when the engine is cold the pistons are not as tightly in the bore as when the engine is warm. (Keep a 30 weight oil in there. Piston slap is usually caused by the piston rings not sealing properly. This can be due to wear, damage, or a manufacturing defect. Thicker oil will not necessarily stop the piston slap, but it may help to reduce the noise. The best way to prevent piston slap is to regularly maintain your vehicle and replace any worn or damaged parts. Piston slap cannot be eliminated because it is caused by the piston secondary motions within the skirt-to-bore clearance that is originated from the crankslider mechanism by nature. The best way to prevent Piston slap? Normally this occurs on idle and overrun. I just replaced the oil 1000 miles ago 5 quarts 5w30 mobile one 1 quart Lucas. 2. A continued piston slap noise indicates that the engine needs service. It is important to note Received 4 Likes on 4 Posts. Wix/Fram XG/Mobil1. 1. Thicker oil will not necessarily stop the piston slap, but it may help to reduce the noise. Piston Slap: To lift, slap, or ignore the LS1? The skirt of the piston slaps against the cylinder wall creating a knocking type sound. This condition is caused by a piston rocking back and forth within its cylinder. Any thicker oil would have done the same, personally I think its just a coincidence How do I mitigate piston slap? Piston Slap I have a '98 with 203k on it. But if the Piston slap is a knocking noise that can be heard when the engine is idling. Step 2: Determine the Cause of Piston Slap. The only strange thing is that sometimes when i put less throttle and rpm goes down i dont hear the radle. Change the oil every 1200 miles for the first three oil changes. Piston slap is caused by excess clearance between the pistons and cylinder wall. My wifeys car is 2000 Alero GLS, that I do all the maintenence on. Answer (1 of 5): This is when the gap between the piston and the cylinder wall is so large that instead of purely moving up and down the piston also has a back and forth motion as it slaps against either side of the cylinder wall. Piston slap due to zero-skirted Piston has been present since day one. Still, if the sound is only heard when the engine is cold, it is probably not a serious issue. The carbon theory may hold creditability. Continuous piston slap means the engine needs service; however, if you only notice this sound when the engine is cold, it is likely not serious. WHAT PISTON SLAPS SOUNDS LIKEIf you are wondering what piston slap sounds like check out the video.This video will demonstrate what piston slap sounds like. The noise is actually called "Skirt Slap" which is a loose piston "cocking" in the bore, causing the piston skirts to "click" or hit the bore walls, making noise. The problem can be A continued piston slap noise indicates that the engine needs service. If it's a cool morning, it will 'slap' for 2-5 minutes. A hollow, muffled, almost bell-like sound is usually piston slap. The sound can be loud or quiet, and it may go away when the engine warms up. Problem is this: There's a TON of things that at the 2000-2800 rpm range, can resonate, making the same noise. The GM engine needs the full 20W characteristic in operation to provide proper protection. Still, if the sound is only heard when the engine is cold, it is probably not a serious issue. So I'm driving around this weekend and I've been hearing this odd sound near 5-6k rpms. Use the TCW3 in your fuel. I have forged pistons in my car and I'll stop short of calling it a diesel, but it's not far from it before she warms up. Use a High Flow Oil Filter. A continued piston slap noise indicates that the engine needs service. Viscosity Improvers in modern motor oils begin to lose their effectiveness after 1200 miles. The high RPM and Piston loading will eventually free up the rings, to some extent. They heat up and expand and the piston slap goes away (mostly). How piston slap is avoided? Its an indication that Methods to fix piston slap: Here are the methods that could help you in fixing up the piston This can be due to wear, damage, or a manufacturing defect. Instead of smoothly moving up and down (reciprocally), it comes loose and starts making a horrible noise. This mostly happens when the engine is idling or during the overrun (thats when you let go of the throttle and the engines RPM goes down). Some engines are more susceptible to piston slap, especially engines with aluminum pistons or cylinder blocks. Why does it happen?Want to learn more about performance engine building? Figured this could apply to w-bodies so thats why I posted in the General section. How to Fix Piston Slap | Fix It By Only 12 Steps (2022) - DIY Quickly Piston slap is a knocking noise that can be heard when the engine is idling. Nonetheless, I've ran SAE40 in it trying to eliminate the "pistons slap", but it turned out it was the absolute loudest, regardless of ambient temperature. it "slapped" louder A couple quicker looks, one, pull the head pipe off and look up the exhaust port. This could happen for many different reasons. Use flash light. I am thinking it's piston slap but I'm not sure what else it could be. It now appears that GM was well aware that cold start piston slap would never be eliminated due to a flaw in the engine's basic design, as evidenced by this extract from page 6-37 in the Helm's Manual: Most pistons are cam ground, meaning they are egg shaped when cold, and when heated swell to a round shape. Likes: 4. It is caused by the piston hitting the cylinder wall, and it can happen when the engine is cold or has low oil pressure. One of the most difficult Heat causes the piston inside the cylinder to expand, which takes up the slack between the piston and cylinder wall and hence eliminating piston slap. The only thing that makes sense is piston slap. Controlling or eliminating piston slap begins by understanding exactly whats going on between the piston and the cylinder bore that causes it. Re: "Rod Knock" Turns out to be top cylinder piston slap - what caused and how to fix Re: "Rod Knock" Turns out to be top cylinder piston slap - what caused and how to fix Would not use a ball hone,may hook up on the ports,better to use one like this( adjustable): Remember to use right speed and up and down for correct hatches. Step 3: Wait HT/HS is just fine in a 30 weight.) The sound can be loud or quiet, and it may go away when the engine warms up. 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