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#215167 - Tue Sep 05 2006 11:27 AM My PB Blaster vs. Kroil test
Builder Offline
Shop Shark
Registered: Wed Apr 20 2005 12:00 PM
Posts: 3449
Loc: Minnehaha County, South Dakota
Friday I brought home a 1957 Corvette engine. When I took it apart, the right bank of pistons were all stuck. One of the worst ones had a pile of white and yellow crystalized corrosion filling the cylinder. It reminded me of a severely corroded battery terminal. I decided to test the PB Blaster and Kroil on the motor to find out which one actually worked the best.

For the sake of clarity I will number the cylinders 1-2-3-4.

The two outside cylinders (1 and 4) had the most corrosion, and I assumed they would be the toughest pistons to remove. The two center cylinders were stuck and not quite as bad.

Cylinders 1 and 4 seemed to be the worse of the four, and I decided that since the Kroil was the most expensive I would give it the task of the worse cylinder (#1). I also chose to use kroil in the number 2 cylinder. PB Blaster was used in 3 and 4, with 4 being the worse of those two.

First I took a 2" wire wheel on my die grinder and removed as much rust and corrosion from the tops of the pistons and I cleaned the tops of the cylinders too. I then propped the block so the right bank of pistons were level.

I then sprayed Kroil into cylinders 1 and 2 until the top of the piston was covered, then the same to 3 and 4 with the PB Blaster. I noticed the PB Blaster was bubbling a little around the edges of the piston. It reminded me of carbonated beverage when you pour it in a glass. I let them both sit for about 18 hours. All the cylinders looked like they had the same amounts of penetrant on top of the pistons when I returned.

First I took a wood 2 x 2 and hammered the two center pistons (2 and 3) down into the bore. Both came loose relatively easy. I pounded them from the bottom and they both came out of the cylinders fairly easy and with reletively equal force.

I pounded on the tops of the 1 and 4 pistons to see if they would loosen up. The number 1 cylinder with Kroil started to move so I continued to work on it. I got it far enough down the cylinder to see where the rings has set against the cylinders. I took my wire wheel and cleaned up the cylinder again and then pounded the piston from the bottom and it came out of the cylinder.

I then turned my attention to #4 with the PB Blaster. I pounded and pounded on the top and bottom of the piston and it would not move. I sprayed some more PB Blaster on top of the piston and waited about 15 minutes and pounded again. The piston did not move.

I decided that I had better prop the motor up again and let it soak another day. I was already leaning towards the Kroil as being the better of the two, and I sprayed some Kroil in the #4 cylinder.

After 10 minutes I took the 2 x 2 and hit it with the hammer. The piston moved on the first hit. After moving the piston down far enough, I again cleaned the cylinder with the wire brush. I pounded from the bottom and got the piston out.

Now you could say that all the pounding on the #4 PB Blaster piston helped loosen it up before switching to the Kroil, but I really believe that the Kroil did a better job of penetrating and loosening up the pistons. I also looked at the cylinders afterwards too. The PB blaster cylinder showed deeper scores in the cylinder walls from the hard deposits left behind.

I also noticed the lubrication of the kroil was much higher. The PB Blaster seemed dryer and less oil like.

My test finds Kroil superior to PB Blaster.
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#215168 - Tue Sep 05 2006 12:22 PM Re: My PB Blaster vs. Kroil test
dad6timz Offline
Shop Shark
Registered: Sat Mar 26 2005 12:00 PM
Posts: 637
Loc: simpsonville sc
I always thought PB was the best but I will now try Kroil. I'm always willing to try new stuff.
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#215169 - Tue Sep 05 2006 12:55 PM Re: My PB Blaster vs. Kroil test
cletis Online
Registered: Sat May 19 2001 12:00 PM
Posts: 10459
Loc: Parker County Texas
Thanks for the report. Very thorough and easy to comprehend.
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#215170 - Tue Sep 05 2006 04:56 PM Re: My PB Blaster vs. Kroil test
49 geezer Offline
Shop Shark
Registered: Mon Nov 13 2000 12:00 PM
Posts: 767
Loc: Hedgesville, WV
Started using Kroil after my F in Law recommended it. They used it at the Celanese plant in western Maryland all the time. Never been happier with a product.
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#215171 - Tue Sep 05 2006 10:05 PM Re: My PB Blaster vs. Kroil test
Packrat Offline
Wrench Fetcher
Registered: Wed Aug 30 2006 12:00 PM
Posts: 83
Loc: Upper Michigan
Where can a guy buy Kroil? I have s stuck 350 in my 48 coupe. I have kept the cylinders full of PB for the last 3 or 4 weeks and tried to turn the engine with a bar on the flywheel but no luck. I was trying to get away without pulling the heads. It looks like I might have to pull it apart and use the wooden block. I have tried to find Kroil but no luck. Don
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#215172 - Tue Sep 05 2006 10:06 PM Re: My PB Blaster vs. Kroil test
Packrat Offline
Wrench Fetcher
Registered: Wed Aug 30 2006 12:00 PM
Posts: 83
Loc: Upper Michigan
Where can a guy buy Kroil? I have s stuck 350 in my 48 coupe. I have kept the cylinders full of PB for the last 3 or 4 weeks and tried to turn the engine with a bar on the flywheel but no luck. I was trying to get away without pulling the heads. It looks like I might have to pull it apart and use the wooden block. I have tried to find Kroil but no luck. Don
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#215173 - Wed Sep 06 2006 01:23 AM Re: My PB Blaster vs. Kroil test
J Lucas Offline
Registered: Mon Nov 22 2004 12:00 PM
Posts: 2589
Loc: South Omaha, Nebraska
I have been impressed with PB Blaster, looks like I will have to check out Kroil.

Thanks for the tip.

John
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#215174 - Wed Sep 06 2006 01:55 AM Re: My PB Blaster vs. Kroil test
Inky05 Offline
Shop Shark
Registered: Sat May 21 2005 12:00 PM
Posts: 1178
Loc: N.E. Pennsylvania
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#215175 - Wed Sep 06 2006 08:43 AM Re: My PB Blaster vs. Kroil test
Achipmunk Offline
Registered: Tue Dec 11 2001 12:00 PM
Posts: 13907
Loc: Boiling Springs, S. C. 29316
packrat, most industrial supplies carry it and "some" parts houses. I use to get it in a can like WD-40 but now I can only find it in a larger can and use my own squirt bottle. Its the best stuff around. The plant I worked at for many many years tried it all.....and ended up using Kroil to. I have a quart of it!!
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#215176 - Wed Sep 06 2006 10:02 AM Re: My PB Blaster vs. Kroil test
Billybolt Offline
Shop Shark
Registered: Thu Feb 12 2004 12:00 PM
Posts: 652
Loc: Bay Area, CA
sea foam
Test this stuff out. Its expensive but good. It even sprays upside down.
Sea foam, Deep Creep
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