Ather

I recently did a compression restore treatment using the BG 109 Compression Restore product based on Bill's recommendation (thanks Bill, you're awesome). There is a definite improvement in performance which you can feel. It may not have fixed all the compression issues but for 8 bucks plus shipping, its definitely worth the money. If you're experiencing sluggish performance (your car that is), and you suspect compression, give it a try. Just thought I'd share to see if anyone else can benefit.
Cheers,
Ather

Randy V

Model year and mileage of your car?

Ather

87 S4 Auto, 128k.

S4ordie

I don't understand how any product can restore compression. Isn't BG products for carbon removal? If what you mean is that increased compression is restored to lower compression after carbon in the cyclinders is reduced I geuss I understand that. If you have a low compression issue I can't see how any product works on that.

Imo000

Sounds like an ordinary combustion chamber cleaner. You can achieve the same exact results with water and save yourself the $8 plus shipping.

pcar928fan

I should try something in EURO85...might help!

Ather

So here's the story. My mechanic ran a compression test. The numbers were very low. He mentioned that there could be carbon build up and the valves may not seat properly. He suggested trying to remove carbon buildup. Bill suggested BG products so I gave it a try.

With regards to the water, I haven't tried it and don't know too much about the process but personally don't feel comfortable pouring water into engine.

Tony

neat and all but do you have any before and after numbers to see how much of an improvement?

What was your compression before?

SeanR

If there was enough carbon on the valves to keep them from fully seating, you can lose compression.

Speedtoys

Same as fuel...a liquid.

Imo000

And the stuff you've poured into the engine is 99% made out of whater, right?

The water method is an old mechanic's trick. Don't beleive me, do some research. All the combusiton chanmber cleaners are based on it, they just add a few other thing so they can call it something else and charge $8 plus shipping.

Bill Ball

On one friend's GTS that had terrible pinging and very HIGH compression (presumably from a thick layer of coke on the piston tops and roof of the combustion chamber), we tried the "water treatment" mechanic's trick without anything much happening despite sucking in several liters of water into the intake. He then had a BG intake treatment with 3 chemicals done at a shop with excellent results. The compression fell back to the normal range (190-195 down from 210-215) and the pinging was eliminated. When we had the intake off a bit later, we could see that the backs of the valves which were previously coked up were now clean.

I don't know exactly what Ather used. I drove his car before and SOMETHING was wrong, but I did not get a chance to do any testing. I had planned to have him come over and repeat the compression test and do a leakdown, and check some other things that might account for his loss of power and a noticeable vibration, but we haven't had a chance to do that.

dr bob

Euro85 was a test mule/ GuineaPig for my injector cleaning setup while the car vacationed in SoCali. Simple enough to drop in a couple different BG cans and see what might happen. There was a definite improvement. Not saying there isn't more though.

dr bob

The water trick works for sure poured into a carburetor, but getting even distribution among the cylinders doesn't work if you allow the fluid to be drawn in through a vacuum port. Can't run water through the MAF. So it needs to go in through the boot between the MAF and throttle. Needs to have a lilttle lower vapor pressure than water so it doesn't puddle in the belly of the intake, but really needs to do most of its "flashing" at the valves and the in the combustion chambers. The temperature shock of the cold water on the valve deposits steam-blasts a lot of junk loose as it flashes.

Tony

I use this stuff...when Im down to my last few gallons in the tank, then i add
it.
Liqui Moly Ventil Sauber

This is actaully a pretty good price...
http://www.fcpeuro.com/products/vent...ui-moly-lm2001

just ordered 6 cans...Our Exped could use some i know. Its been a while.


http://www.liqui-moly.de/liquimoly/p...cument&land=DE