When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
For those familiar with signs of bore scoring, from videos I have seen of bore scoring, I'm mostly concerned with cylinders 2 and 5 on the attached videos. I was still getting used to how to move around the scope for cylinder 1 and 2 so you would have to bear with the moments in the video that aren't useful. For Cylinder 2, if you move to about the 3 minute mark it has the best video. I have the engine out of the car at this point planning to do clutch, rms, ims retro, aos, etc…
Cylinders 2 and 5 seem to have some scoring but maybe earlier stage? You can also see a little moisture on one spot on Cylinder 2. I would appreciate input from someone with experience with this.
Those videos don't appear to play as I had to convert them from MP4 to MOV and the free converter I used is putting a watermark on it that I guess you can only play the video with their player. I'm going to have to find some other way to share the videos
Here are a series of photo's of the area of cylinder 2 that showed some discoloration on the cylinder wall. I looked at my photo's and video of 5 again and I'm convinced I was seeing shadows. In any case this area of Cylinder 2 shows the only signs I see in all the cylinders. I can't really make out any scoring in the video or photo but it is discolored in streaks in this one section
I don’t know if that’s scoring or just normal wear but what are all the bits of debris on the pistons? Are those just anti seize granules that fell in after removing the plugs?
Stage 3 scoring on one, and looks like stage 4 scoring on the other the best I can tell. I'd expect this one is making a lifter ticking sound, and has started eating some oil by this point?
You have longitudinal scoring over at least 2/3 of the piston travel, it appears.
If you pull the sump plate, and sneak in to the bottom of the bores (#5 is really tough to do) you'll probably see more scoring. The issues start at BDC and the piston covers the area up, which fools a lot of people.
Like I always say, if you are going to have a failure, this is the best one to have.. Little to no collateral damage to the components that wouldn't be getting thrown away, no matter what. I am doing several videos for the Rennvision channel this week on bore scoring. We sold 4 engines last week (unheard of in January!) and of those 4, 3 of them had scored bores. Bore scoring is leading to more engines coming our way than all the other failures combined. I plan to do several videos about diagnosis, and actually performing this bore scope analysis with a cheap smart phone bore scope that anyone can buy, and use.
Interestingly enough, that little puddle that you see... Guess what that is? When you figure it out you are close to understanding the most misunderstood contributing factor to this affliction...
Interestingly enough, that little puddle that you see... Guess what that is? When you figure it out you are close to understanding the most misunderstood contributing factor to this affliction...
Fuel leakage from compromised Injector because of alcohol in fuel...just a guess.
Like I always say, if you are going to have a failure, this is the best one to have.. Little to no collateral damage to the components that wouldn't be getting thrown away, no matter what.
...
Interestingly enough, that little puddle that you see... Guess what that is? When you figure it out you are close to understanding the most misunderstood contributing factor to this affliction...
Two questions then Jake:
1. If there is no collateral damage "no matter what", at what point does an engine with bore scoring NEED to be rebuilt?
2. When do I KNOW my injectors need to be replaced/serviced?
I watch my fuel trim numbers and put seafoam through my tank every month, but the loss of perceived power I am getting by running 91 octane no-ethanol gas is not being offset by the sense of self righteousness I am experiencing knowing I am protecting my bores.
Without looking at the Flat6 site, I am going to guess gasoline that has been "washing" oil from the cylinder. Probably due to injectors spraying too much fuel (running rich).
1. If there is no collateral damage "no matter what", at what point does an engine with bore scoring NEED to be rebuilt?
2. When do I KNOW my injectors need to be replaced/serviced?
I watch my fuel trim numbers and put seafoam through my tank every month, but the loss of perceived power I am getting by running 91 octane no-ethanol gas is not being offset by the sense of self righteousness I am experiencing knowing I am protecting my bores.
The cost to replace injectors is not much vs testing and refurbishing, just get a new set and forget about it...
01-05-2019, 04:55 PM
Cylinder Scope 2004 C2
