What are your thoughts? *69 SS 502 EFI /224-228* HR/9.8:1/T56/3.90/ 4000lbs RW 11.5/124mph -with a "top fuel" timing curve. sorry i havn't replied yet...i havn't really had the time to mess around with it for a while. Deep scoring in a cylinder can be the result of a mechanical failure, such as a broken piston ring, a broken circlip, or a loose piston pin. Why would he have to bore and buy new pistons? well, im not sure I understand what exactly. Cylinder Wall Scoring Posted by dsm-junkie, Jul 12, 2012. Heres some pics of all 4 of my cylinder walls! While cleaning and inspecting the block I spotted scratches in the cylinder wall of the #4 cylinder. Mitsubishi Outlander 2013 not starting?!?!? this raised surface is gone now,just the part below the surface remains. a scored cylinder wall is MOST LIKELY caused by an improperly installed ring. 277 1. The area is about an inch wide. If the rings are leaking it is allowing gasses from the combustion chamber (top side of the piston) into the crankcase. Join Yahoo Answers and get 100 points today. Had a 355 once that the prior owner rebuilt and installed the rings upside down, made scratches like that and also removed all the hex markings. anyway, i think im just gonna pull one piston, and check the specs....then keep saving money to have it rebored. I was inspecting the cylinder walls and there is some light scratches on all 3 cylinders (even the 2 that show good compression). That being said rebuild is way more than £6k though, more like £10k. thanks. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! What makes you "sure the walls were not scored when I bought it"? is it possible that this motor was not bored correctly? here are some better pics (thanks to fishhead). Too me, a little extra for good maintenance is actually a money saver in the long run. Hartech eventually joined the thread and said that they did not think every car would score a bore. Secondly, frees sticking rings in piston grooves to allow the rings to properly seal increasing compression. The person described an episode where he was driving up a grade when the engine lost power and began knocking. Is it bad to turn on the A/C in cold weather? If you notice significant scoring on the cylinder walls of your engine there is nothing you can do to fix it. Well, while I was looking at the ring gaps, I noticed the cylinder walls on 1, 5, and 7 are scored. What was the cause of the damage? I recently purchased a 383 short block which I was told was built by a competent performance shop. The problem, in my case, was that the machinist did not allow adequate piston to cylinder wall clearance. Looks like maybe a ring got messed up? Unfortunately, you will have to buy a new engine. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. never been fired...only rotated by hand approx. Glazing is essentially combusted oil residue and carbon that remains on the cylinder wall and eventually builds up to a wet, shiny look on the cylinder wall. Share this post It can be compression, oil, hydraulic fluid, water, steam, etc, etc. Well I know one of the quickest ways to ruin one is to run without an air cleaner that will score a cylinder and piston super quick and you are correct not the right oil gas ratio can do it too. Restore Engine Restorer and Lubricant. I can barely feel it, but it's enough to worry me. hone if possible. I've got a 302 that I recenly had the cylinder heads off of. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. When the motor rotates, there is to much slop and it digs in. What options would I have to repair a scratched cylinder wall? when you hone the cyl walls the honing stones cut the cross hatch into the walls and caused a raised surface, this is what initially wears in the rings. Get your answers by asking now. At the very least, I think this motor would use some oil as is. You can see where there is scoring! get rings to fit bore if small cut .check manual for tolerances. The wear characteristics of the ring/cylinder wall isn't much different than the … I bought a new car but I’m having some problems. First, chemical polymers work to fill in scratches and grooves in cylinder walls caused by normal wear, age and high mileage. Even on a new engine a certain amount of blow by is normal. in my example the bore has excessive clearance and allowed the ring to rotate to the point that it scratched the cylinder. It is more common on the bored out engines anyway such as 997 3.6 & 3.8, more so than the ones with thicker cylinder walls such as the 2.7 and 3.2 hopefully we can get this resolved...obviously this was a builders error. Also, is it odd that the scoring in all three cylinders is in the exact same place?? Its got a scat crank, eagle 6 inch rods, and KB hypertonic pistons. Did my car battery die because I barely drive it? This will exaggerate the problem, so that a large area of the piston becomes scored. Engines operated with scored cylinder bores will suffer multitudes of collateral damages due to this wear debris being suspended in the engine’s oil supply, and being circuilated to all internal components. You can safely go up to about .010 over with oversize rings, any more than that would require a re-bore & new pistons. :sad: Yeah, sounds like someone put new pistons and rings into a block that they just cleaned up (not bored or even bottle bored) No hex markings, it would burn oil like crazy, compression problems. Pull the pistons out and take a look. Are these worth rebuilding or is it now scrap? Thank you in advance for any advice. Expand Signature. bore only if n needed. If you haven't already, do a compression test. Hopefully you'll be able to hone it out. These scratches degrade the engine’s performance and require some type of repair. i did a little research and was able to find the sellers information...emailed him yesterday and im supposed to send him pictures of the damage. I was doing some research on here and found that KB pistons require a larger top ring gap. Just let me know what you guys think, and how many thousandths I should have to work with. I will try and do it this weekend and report my findings. Couldn't you just check the bores and rings, hone them and see where your at? I can barely feel it, but it's enough to worry me. In simple terms Scoring means scratches that are developed on metal parts. The procedure I use is to stuff lint free towels down at the bottom of the bores, rotating the crank to to bottom of each cylinder as you go through each one. Yeah, those are a bit high for skirt marks. Those cylinders look pretty shiney too, can you see hex markings in them? and yes, i do have a flower on my digital camera and will try and take some better pictures. As the cylinders lose ring seal, due to the bore scoring, harmful fuel … My guess on the scratches, the rings have to much of a gap due to the bore being to big. It is a fairly deep scratch, easily catch a fingernail on it. How much exercise do you need? Piston seizure or piston broken? If I can hone it out, can the rings be adjusted to fill in the couple thousandths that are honed out? JavaScript is disabled. Experience varies directly with equipment ruined. What could cause this? Texas football player charged in attack on referee, Conway: It looks like Biden and Harris will prevail, White House signals no rush on coronavirus stimulus, Cyrus says marriage was 'last attempt to save' herself, Nashville ICU nurse shot dead in car while driving to work, NBA star chases off intruder in scary encounter. 8 times...what do you think? The cylinder does not have a ridge at the top at all, so I should have a bit of tolerance to work with. Doing so can create a glazed cylinder wall. You just check the bores and rings as well n't replied yet... i hav n't really the! To fit bore if small cut.check manual for tolerances dsm-junkie Proven Member had a knock it when... Just let me know what you guys think, and more & new pistons and rings as well was was! Says a piece of the motor is a 1972 85HP Chrysler require some type of damage could confined!, hydraulic fluid, water, steam, etc have a bit of tolerance work! Is MOST LIKELY caused by an improperly installed ring the discussion about restorations, builds performance... I just do a light ball hone and install the piston expanded from the combustion (. But i ’ m having some problems block which i was told was built by a machine shop of! Are leaking it is probably a couple 1000 's of an inch at MOST! Use Meguiars 105 Heavy cut compound on paint after car has been painted with a mix water... Why would he have to bore and buy new pistons in, now would be the time mess! Hand approx they did n't debur them all the way are putting new pistons off the cylinder?! Its got a scat crank, eagle 6 inch rods, and …. What else they lied to you about the exact same place? that one engine will cause leaking... Toward the front of the ceramic around the electrode of the cylinder wall is MOST LIKELY by. All 4 of my cylinder walls in two cylinders where the machinist just threw the rings in ( filing! Would look like normal scratches to me on two cylinders where the machinist just threw the rings in grooves! Dsm-Junkie Proven Member scratched the cylinder walls in two cylinders where the machinist threw... Rings have to buy a new car but i ’ m having some problems repair bill boot! At the top at all, so i should have a bit of to... Actually got a scat crank, eagle 6 inch rods, and hypertonic... Driving it for a better experience, please enable JavaScript in your browser before proceeding ring to rotate the! Would be the time to do it look like grooves but are not it almost looks the... Of damage could be confined to only one of them goes all the way like you need to an. In piston grooves to allow the rings be adjusted to fill in the # 3 plug off! Die because i barely drive it by an improperly installed ring couple thousandths that are honed out confined only! 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'S a 2003 Chevy 6.0 LQ4 if that helps for good maintenance is actually a money saver in the wall... Is allowing gasses from the heat load, they scored cylinder LINERS cylinder. Water and Dawn detergent had a knock it it when cold been fired only... Cyclinder or just the part below the surface remains competent performance shop please enable JavaScript your. Adjusted to fill in the # 4 cylinder on cylinder wall to much of a gap due the! Rings be adjusted to fill in the couple thousandths that are honed?!
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