Any experience with "sticking piston rings" on dormant engine?
#1
Rennlist Member
Thread Starter
Any experience with "sticking piston rings" on dormant engine?
Has anyone had any experience with sticking piston rings in an engine that has not run in years? Is there such a thing as rings that are just sticking but are still good? I have a 2nd engine in my 82 Euro S that is only starting when I add some oil to the cylinders through the plug hole. I restored this car and replaced the M28/11 engine with a M28/12 that I resealed and had the heads rebuilt on.Decided not to do the rings. I couldn't get it started for the first time till today when added the oil to the cylinders after Porsche mechanics advice. Now it starts,but only when I add oil to the cylinders and throttling up a little keeps it running till I let off the gas. Then it dies and wont restart. I checked Google and found the Rislone web site advertising a ring seal oil additive that also says it can free sticking rings. http://www.barsproducts.com/rislone_faq.htm
from the site=What are the most common causes of low engine compression?
Low compression can be caused by normal engine wear and decreased sealing between the piston rings and cylinder walls. This can be the result of scratches in the cylinder walls or sticking rings in the pistons which allow compression to move from the top of the cylinder down into the crankcase below the piston.
How does Rislone Compression Repair with Ring Seal work?
Rislone Compression Repair with Ring Seal works two ways to solve low compression problems. First, chemical polymers work to fill in scratches and grooves in cylinder walls caused by normal wear, age and high mileage. Secondly, frees sticking rings in piston grooves to allow the rings to properly seal increasing compression.
This is probably BS witch oil but do sticking rings exist and how do you unstick them?
from the site=What are the most common causes of low engine compression?
Low compression can be caused by normal engine wear and decreased sealing between the piston rings and cylinder walls. This can be the result of scratches in the cylinder walls or sticking rings in the pistons which allow compression to move from the top of the cylinder down into the crankcase below the piston.
How does Rislone Compression Repair with Ring Seal work?
Rislone Compression Repair with Ring Seal works two ways to solve low compression problems. First, chemical polymers work to fill in scratches and grooves in cylinder walls caused by normal wear, age and high mileage. Secondly, frees sticking rings in piston grooves to allow the rings to properly seal increasing compression.
This is probably BS witch oil but do sticking rings exist and how do you unstick them?
#4
Rennlist Member
Hmmm,
Pressure probably wouldn't help. RPM might.
If there's some compression to be had, we've used a couple of things over the years to free things up, but not on a Porsche engine.
#5
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By far the most common cause of very low compression on all cylinders is a badly overheated engine which got so hot it compromised the spring of the rings...... and nothing in a can will fix that. This was the engine which before they shipped it too you they said it had low compression ? Seems they were correct.....
#6
Rennlist Member
Thread Starter
I did my first one ever a few days ago after Landseer suggested it due to my no start. I checked 3 cylinders with a borrowed(O'reillys) gauge. Questionable results were around 30. I was upset and thought the gauge might be wrong so borrowed another one and got low readings so did a wet one and got 160-240. I might check into a leakdown test or redo the compression test better to see what cylinders are affected.
#7
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Thread Starter
Even after rebuilding the cluster it looks like I have gauge problems and gauge illumination probs. Warning lights work.
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#8
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Or, at this point, as you are working this and the 'other' BB, and getting similar feedback and advice, accept the engine is shot as Jim suggests, and pull it again and do a ring job. No amount of oil, compression testing and other tbd voodoo will fix your problem right now, and forget about the cluster gauge problems -
Sorry, but you have a re-ring in your future.
Sorry, but you have a re-ring in your future.
#10
Rennlist Member
Thread Starter
By far the most common cause of very low compression on all cylinders is a badly overheated engine which got so hot it compromised the spring of the rings...... and nothing in a can will fix that. This was the engine which before they shipped it too you they said it had low compression ? Seems they were correct.....
#11
Rennlist Member
Ah!
By far the most common cause of very low compression on all cylinders is a badly overheated engine which got so hot it compromised the spring of the rings...... and nothing in a can will fix that. This was the engine which before they shipped it too you they said it had low compression ? Seems they were correct.....
Looks like it's going to be coming out again. If there were just some old carbon or light corrosion, that's a lot different than cooked rings.
#12
Rennlist Member
Thread Starter
Or, at this point, as you are working this and the 'other' BB, and getting similar feedback and advice, accept the engine is shot as Jim suggests, and pull it again and do a ring job. No amount of oil, compression testing and other tbd voodoo will fix your problem right now, and forget about the cluster gauge problems -
Sorry, but you have a re-ring in your future.
Sorry, but you have a re-ring in your future.
#13
Three Wheelin'
The cylinder walls look pretty good. I dont think its your rings. We did a compression test on later car and it was showing 30 psi when it was cold, we put some oil in the cylinder from the spark plug hole and it end up showing 160-180 psi. The car is running fine now.
Did you do any media blasting to the intake?
Did you do any media blasting to the intake?
#14
Rennlist Member
I think most of us on here that have been following you feel your pain, but you are approaching that point where you have to say 'yes' and get out the engine hoist. Good luck, if i was anywhere near close to you i would be right there to help -
#15
Rennlist Member
Thread Starter
The cylinder walls look pretty good. I dont think its your rings. We did a compression test on later car and it was showing 30 psi when it was cold, we put some oil in the cylinder from the spark plug hole and it end up showing 160-180 psi. The car is running fine now.
Did you do any media blasting to the intake?
Did you do any media blasting to the intake?