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My PB Blaster vs. Kroil test
#215167 Tue Sep 05 2006 04:27 PM
Joined: Apr 2005
Posts: 2,004
B
Builder Offline OP
Shop Shark
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.

Re: My PB Blaster vs. Kroil test
#215168 Tue Sep 05 2006 05:22 PM
Joined: Mar 2005
Posts: 300
D
Shop Shark
I always thought PB was the best but I will now try Kroil. I'm always willing to try new stuff.


The crew that works on the \'42 --Sara, Hannah and Abby [stovebolt.com]
Re: My PB Blaster vs. Kroil test
#215169 Tue Sep 05 2006 05:55 PM
Joined: May 2001
Posts: 8,386
Extreme Gabster
Thanks for the report. Very thorough and easy to comprehend.


"It's just a phase. He'll grow out of it." Mama, 1964

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Re: My PB Blaster vs. Kroil test
#215170 Tue Sep 05 2006 09:56 PM
Joined: Nov 2000
Posts: 582
4
Shop Shark
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.


Country Roads, West (By God) Virginia
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Re: My PB Blaster vs. Kroil test
#215171 Wed Sep 06 2006 03:05 AM
Joined: Aug 2006
Posts: 37
P
Wrench Fetcher
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


"Sometimes my luck is so bad that if I bought a pumkin farm, halloween would probobly be outlawed."
Re: My PB Blaster vs. Kroil test
#215172 Wed Sep 06 2006 03:06 AM
Joined: Aug 2006
Posts: 37
P
Wrench Fetcher
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


"Sometimes my luck is so bad that if I bought a pumkin farm, halloween would probobly be outlawed."
Re: My PB Blaster vs. Kroil test
#215173 Wed Sep 06 2006 06:23 AM
Joined: Nov 2004
Posts: 1,855
J
Workshop Owner
I have been impressed with PB Blaster, looks like I will have to check out Kroil.

Thanks for the tip.

John


J Lucas





1941 Chevy 1/2-Ton
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1959 Chevy Apache 31 Fleetside
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1959 Chevy Viking 40

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Re: My PB Blaster vs. Kroil test
#215174 Wed Sep 06 2006 06:55 AM
Joined: May 2005
Posts: 375
I
Shop Shark


IRWIPI 2005 Peoples Choice
Inky,
"It's not that I haven't done IT... It's that I haven't done IT yet."

--------------------
'48 1-1/2 ton Dump
'57 Chevy Panel
'59 Chevy 2 ton Dump
Re: My PB Blaster vs. Kroil test
#215175 Wed Sep 06 2006 01:43 PM
Joined: Dec 2001
Posts: 15,239
Boltergeist
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!!


1937 Chevy Pickup
1952 Chevy Panel
Pictures in my Photobucket
1950 Chevy Coupe

52 Chevy Panel

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
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Re: My PB Blaster vs. Kroil test
#215176 Wed Sep 06 2006 03:02 PM
Joined: Feb 2004
Posts: 336
B
Shop Shark
sea foam
Test this stuff out. Its expensive but good. It even sprays upside down.
Sea foam, Deep Creep

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