Engine Blow By?

[sschefer]

Re: Engine Blow By?

The debri breaking and being pushed through oil or with the oil vs. being burned up or to a small amount that isn't harmful is my concern. I've used seafoam in the past and have had a 75% or better sucess rate at feeling, hearing, and seeing the engine in better running condition. Seems like the liquid is thin enough to move around when needed.

Now the Rislone I haven't used yet for engine treatment and after reading about the bearings being spun on 2 aircraft engines really does concern me.

I'm sure in auto application the Rislone engine treatment probably does a great job cleaning the heads & rings but considering it's a marine engine at much higher RPM's I have a feeling it wasn't designed for the marine application.

At least with Seafoam it says right on the bottle that it can & is designed to put into a Marine engine which makes me feel alot better.

My Dad swears by Seafoam and I can see how a strong cleaner could clean out the inside of an engine or at least reduce it which is a win either way in my eyes.

The seafoam made a big difference on my snowblower last winter.

In defense of Sea Foam I have to admit, I've been running old MTBE gas with Sea Foam in it mixed at 50:1 in my Honda 4 stroke Lawn Mower for 3 years now. Still have 15 gals left and the mower starts first pull every time. It makes a little oil now but the thing is about 10 years old and gets used every Saturday. Heck, I'm afraid to put fresh gas in it. LOL...

For real though, Your probably right, the problem that was seen with tight tolerance aircraft engines probably wouldn't occur in a marine or run of the mill auto engine. I probably wouldn't put it in a Bentley but that old Ford 302 might like it.

 

[gus-gus]

Re: Engine Blow By?

In defense of Sea Foam I have to admit, I've been running old MTBE gas with Sea Foam in it mixed at 50:1 in my Honda 4 stroke Lawn Mower for 3 years now. Still have 15 gals left and the mower starts first pull every time. It makes a little oil now but the thing is about 10 years old and gets used every Saturday. Heck, I'm afraid to put fresh gas in it. LOL...

For real though, Your probably right, the problem that was seen with tight tolerance aircraft engines probably wouldn't occur in a marine or run of the mill auto engine. I probably wouldn't put it in a Bentley but that old Ford 302 might like it.

Not to be disagreeable, but aircraft reciprocating engines have tolerances far larger than most any marine or automotive powerplants. Tolerances are larger because of FREE air cooling (no fan). The temperature variations are far larger than liquid cooled engines are, therefore the expansion and contraction of all air cooled engine components are much more extreme, requiring those larger clearances. Even turbine engines running at 70,000 RPM are just a bit tighter, not a lot tighter either.
We know that the carbon can be destructive to all bearings but especially babbitt bearings and I also believe it is indirectly caused by the timing when Rislone was used. It was used on an extremely coked up engine. This very likely could have been inconsequential if used on a younger less coked up engine. I just don't trust it and don't know for sure the true condition of coking or carbon build up in any engine, so to me it just isn't worth the risk. However I am not saying don't I am saying I won't.

 

[sschefer]

Re: Engine Blow By?

Wow, I didn't realize that. Makes a lot of sense. I'm curious as to why a babbeted bearing would be more susceptable. Unless the clearances are extremely wide doesn't the oil have to go through the filter before it gets to the bearings. With rollers they get oil both ways and I could see how unfiltered oil would be a huge problem.

 

[gus-gus]

Re: Engine Blow By?

Wow, I didn't realize that. Makes a lot of sense. I'm curious as to why a babbeted bearing would be more susceptable. Unless the clearances are extremely wide doesn't the oil have to go through the filter before it gets to the bearings. With rollers they get oil both ways and I could see how unfiltered oil would be a huge problem.

Babbitt bearings or better described as bushings, are amazingly soft and every spec of matter is either imprinted into the surface or washed out. The oil filters do remove most of the offensive matter. The oil filter normally exists right after the pump in an oil system. So what happens when Rislone releases carbon bits from the ring grooves and piston sides into the cylinder bores? This is my concern, it could be scoring those cylinder walls as it heads toward the oil pan/pump. Every micro speck of carbon creating a sandpaper like surface inside the oil pump and on bearing surfaces in the oil system.
Granted carbon always exists in engine oil, since it is a by product of burned fuels and oils. The difference in my imagination would be one of quantity. Releasing large amounts rapidly or at a much faster rate than normal. To me is gambling with the engines life span. However the advertisers believe and suggest if done successfully, and the piston rings are freed by the use of a Rislone like product, it is also very possible it will improve the performance of the engine. I know it is possible that they are correct, if all goes well. That is the gamble.

 

[gus-gus]

Re: Engine Blow By?

One more point which may be tough to describe has got me thinking about bearings ingesting oil, high in carbon.

Consider this, The crank isn't in the oil (normally) and in some engines the rod bearings are splashing in the oil and some are not. The ones that aren't splashing in the oil (most newer engines) have higher oil flow to them to both lubricate and cool the rods and crank. The oil flowing into the crank and being pumped through is now thrown around the engine in a spray/mist of oil. Washing cylinders down with cooling and lubricating oil. Is it then conceivable to believe everything being washed off of the walls will once again be draining onto and into the spinning rod caps and crank journals. Drooling down the cylinder walls over the crank bearing bosses or saddles, onto and into the journals. and since a (nominal clearance of .003 to .009) clearance exists and the wobble in that clearance is "pumping" or moving away from one side toward the opposite side, returning back as cylinders fire and forces flex the crank. This describes (at least to me) a method for oil high in carbon bits would have an unfiltered access into main bearing journals. No?

 

[jmw129]

Re: Engine Blow By?

One more point which may be tough to describe has got me thinking about bearings ingesting oil, high in carbon.

Consider this, The crank isn't in the oil (normally) and in some engines the rod bearings are splashing in the oil and some are not. The ones that aren't splashing in the oil (most newer engines) have higher oil flow to them to both lubricate and cool the rods and crank. The oil flowing into the crank and being pumped through is now thrown around the engine in a spray/mist of oil. Washing cylinders down with cooling and lubricating oil. Is it then conceivable to believe everything being washed off of the walls will once again be draining onto and into the spinning rod caps and crank journals. Drooling down the cylinder walls over the crank bearing bosses or saddles, onto and into the journals. and since a (nominal clearance of .003 to .009) clearance exists and the wobble in that clearance is "pumping" or moving away from one side toward the opposite side, returning back as cylinders fire and forces flex the crank. This describes (at least to me) a method for oil high in carbon bits would have an unfiltered access into main bearing journals. No?

WOW! Guys, I'm not sure what to think... I sent an e-mail to Rislone since they have all kinds of customer praises about their product & within 2 hr's I received an e-mail back from a rep bragging about how the military has used their products with a very high sucess rate?

Has this company been sued? Can they be sued? Really, seriously if the product doesen't free rings, lifter tick, valves, etc then is the product true?

I have used Rislone Compression Repair in my Durango & the product did help. I realize a marine engine is worked waaaaaaaaaaaay more than a car engine.

Has to be a professional Marine product out there that works right???