Discussion in the hokey ass message board started by michiganman061, feb 12, 2009. The noice is getting worse as more miles are on the vehicle, wh. Everything i have read about piston slap indicates there is no reliabilitylongevity issue to speak of with it. This ensures that the engine maintains a consistent level of compression. Gms piston slap may be a lttle more widespread, but i might debate that. The piston rings fit into horizontal grooves in the pistons.
Just wondering, how many of you out there are experiencing this issue. If it does, chances are you probably wont have any problems from it. Feb 25, 20 forged pistons are more slap happy than cast cast pistons when cold. Oct 06, 2007 the piston is quite bad considering its only done about a thousand miles, there were some very slight chips on the top and quite allot of blowby, the top ring was okay, the bottom ring had failed though. If you want to rid piston slap for good, replace the pistons with some quality aftermarket ones. It happens when there is too much room for the piston in the cylinder and the skirt of the piston. How to easily diagnose engine connecting rod knock. Gt350 oem ecu software update piston slap reduction ford. Should i just try another dealer and ask about this remedy. Gt350 oem ecu software update piston slap reduction page. This item upgraded piston premium ring kit for 0107 toyota 2.
Piston slap on my engine has always been annoying and loud. Typically, piston slap goes away after the engine warms up due to heat expansion. My husband, rrhyne56, gave me your email address, because i have a question about my 2008 honda crv. Feb 06, 2018 in this video i have some pretty good audio of what piston slap sounds like. It might reduce some noise from worn valve gear or reduce the sound of piston slap a. Feb 01, 2011 robert,both my 05 gmc yukon with a 6 liter 69,000 milesand the 05 caddy ctsv 26,000 milesmake the same noise. How to ls swap any vehicle 5 things you need ls swap basics overview long version duration. Ok, so i know ill get flamed for not using amsoil, but i took a shot and changed my oil this last weekend with oreilly brand full synthetic 5w30, and added a quart of lucas oil treatment both were on special at my local store, as prescribed in some other threadsand its made the knocking sound presumed to be piston slap worse in my 09 6. Jul 06, 2012 piston slap was also common in the sixties in the hipo engines, when cold, running forged pistons and lots of piston to cylinder wall clearance.
Piston slap occurs in vehicles from most every manufacturer, not just gm. I have been doing some research and i keep reading about rotella 5w40 oil. After the oil cirrculates for a few seconds the noise is totally gone. Piston slap problems, questions and technical the mini forum. I may be mistaken, but you shouldnt have hydro lifters in your car being an 07, so you shouldnt have any lifter noise unless your valves are out of spec. Mar 11, 2000 piston slap is a thing of the past back in 97,98, and early 99, about 1 in 5. Piston slap is usually worse when the engine is cold and as the engine heats up and everything. What you guys are describing sounds more like lack of lubrication, than piston slap. Finally got it running and it runs even and smooth, but it seems the oil rings are stuck from prolonged sleep, as it is a bigtime smoker. It has always done it when it has been cold out, but since the last 10k miles it is very violent and it doesnt really stop till the engine is very warm and its been driven about 10 miles. I have an 85 4runner that has a piston slapping, does it every day, cold or hot, no matter what kind or weight of oil, it doesnt ever go away it just quiets down after the engine comes up to temp, due to the piston swelling with heat.
I used to run castrol 10w40 since new in my 92 daytona 2. You can often notice damaged cylinder walls by listening for piston slap. The suggested fix was a software update to the engine computer. Piston slap, though annoying, if it goes away when warm its not gonna hurt anything.
That looks a lot like a dirty bird fix rather than a polaris fix. All we ever did for it was giveem a high volume oil pump seriously my 6. Want to learn more about performance engine building. I heard a v10 with the piston slap today the diesel stop. Realistic life expectancy of a stroker motor on a dd.
As for the truck being sluggish,all small blocks are not going to be real strong in low end power. Tsb 182354 didnt fix my 2018 ford f150 v8, and ford bought it. My ls1 engine has some mild piston slap at cold startup, so id like to use something that might help to moderate the slap or any damage being caused. A blow by will reduce engine efficiency by increasing the intake of oil and fuel. Restore also works to quiet startup piston knock, piston slap, and noisy valve lifter ticking. The issue is with the metal gm used and its expansioncontraction rate when the metals heat up and cool down. As the engine gets some miles on it, the piston slap will get louder. The simple way to avoid piston slap is to reduce clearance gap by using thin metal coating on cylinder wall or by using metal sheets. Reducing piston slap noise with oil choice bob is the oil guy. I asked him if there was anything i could have done under warranty or otherwise, and he said nope. Too little clearance between the piston and the cylinder wall and the parts will score and fail. A warm engine with hot oil circulating produced no noise, but sure enough. To solve your piston slap, subaru of america through your dealer will either replace the pistons or replace the short block with new countermeasure pistons.
The subi is a light weight short skit piston in a light weight open deck aluminum block. How much does it typically cost to fix piston slap in a. Is using thicker oil a good remedy for reducing piston blow. Mar 20, 2002 in simple terms, piston slap occurs when the piston is forced rapidly against the side of the engine cylinder wall.
Its pretty much gone now its there if you listen for it, but its not as obtrusive as it. Based on what ive seen online youtube video and forums this vintage subaru is notorious for piston slap. I also give a brief and superficial explanation of what piston slap is. How to fix piston slap the right way check it here.
Yes, all our products were developed by a highly qualified team of research scientists and engineers and have been successfully used in millions of engines over the past 30 years. The engine work took place as the previous owner had not run in the car properly, so in december i sent it to williams minis in peterborough to fix the smoking and oil leaks, got it back in. Subaru pistons are extremely short compared to the 70s buick piston which was a heavy piston in a heavy cast iron block. On my yz 250 two stroke, people with wiesco pistons always complain about piston slap when the bike is cold. The more clearance between the piston and cylinder wall, the louder the knock. Ive noticed it has started to what i believe piston slap where the piston is hitting the cylinder wall very violently. In days of old when i used to do a lot of high mileage engines you could use a thicker oil to reduce oil consumption slightly which gave. Mar 27, 2012 the car does have piston slap, which i noticed while test driving it. Is using thicker oil a good remedy for reducing piston blowby.
Mechanic says i shouldnt worry about wrist pin slap subaru. Any thicker oil would have done the same, personally i think its just a coincidence that your slap kind of went away, because there is very little oil in the cyls when the engine is cold. Apr 15, 2007 piston slap posted in problems, questions and technical. The alarm goes off, in the middle of the night, only when the temperatures are freezing.
Rating is available when the video has been rented. Im willing to bet these are standard operation on these motors. Ive been reading up on the piston slap issue and as it turns out its a. It generally went away as the engine got up to temperature as the piston expanded. My old 07 escalade had it until 200k when it got totaled, and i just picked up another denali with the 6. But in most cases in the absence of any engine problems, piston slap tends to go away as the engine warms up. A friend of mine just bought a 2000 buick century with a 3. I had the supposed classic piston slap noise, and i changed the grade and type of oil and brand of filter, and the noise that i had every winter for the past 3 years went away completely. However, a cracked piston skirt can give you a similar sound. The 8100 feels twice as strong as the 6000 under 2300rpm,form the ones ive. Toyota dealer and toyota tech rep say that piston slap is normal on my now 40,000 mile sienna, it has allways had this rattle when cold. Is using thicker oil a good remedy for reducing piston blowby caused by.
The subaru line, is that if the engine tapping stops after about 10 minutes, they wont fix it, if it doesnt they do. I also know that oil really does not to quite down piston slap. I recently had my engine deglazed, piston rings changed and cylinder head refurbed at moorspeed. Whats one of the best oils for my stock 2004 corvette. Mar 14, 2018 is using thicker oil a good remedy for reducing piston blowby caused by worn piston rings and cylinder bore. Jul 23, 2018 as long as the pistons are not slapping after the engine is up to operating temperature, you ignore it. Mix that with 10% ethyl alcohol and you have a really bad mix. As an aside, does the piston slap go away completely when the engine is fully warmed up. So with using a thicker oil the piston slap in my vehicle became worse. He got the car for a steal, and its actually in decent shape save for the typical cold start piston slap this car has one of the worst cases i have ever heard. Nov 09, 2009 piston slap is when the rod bearing goes out. If you hear piston slap and you stop your engine on time and do not keep driving it you will be able to fix it by boring the engine block and. The symptoms of motors with stuck rings it still runs.
I took the car into ford, and they referred to the bulletin that says the noise is normal and did not offer any resolution at all. Ducati corporate knows theres an issue and has advised how to fix it. The rings expand against the cylinder wall and seal the combustion chamber. Synthetic vs dyno oil to quiet piston slap car forums. This is why they add the moly coat to the skirt so that it will quiet down. Is this rotella oil something worth using or just stick with a good quality oil and oil fliter. Finally, an oil mixture that helps with piston slap. It does get much quieter after it warms up for a minute or. Piston slap is the rocking of the piston in the cylinder as opposed the desired movement of the piston up and down the cylinder. Quora user, amateur race car driver, engine builder and mechanical repair. They only do it when the weather is cold or have been sitting for a while. 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.
1549 1078 854 623 1311 1166 917 1038 1100 1359 1172 146 302 1443 1104 1029 625 1431 30 1300 1133 788 597 520 1167 390 109 1213 374 396 536 1366