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Discussion Forum

What would be a good compression reading on a B?

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08-16-2002 11:02:02

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My B (b450 and be362)smokes a little (white smoke)and seems to get worse after warming up. I measured the compression and all cylinders are running 95 to 100 psi dry. Did not check wet. Pulled valve cover and valves and rockers were very clean, so the head might have been rebuilt fairly recently. Looks like there are no valve seals on stems. I could grab top of valve spring and get a little side to side play.

Would valve seals help? Any opinions?

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Steve in N.J.

08-19-2002 21:40:22

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 Re: what would be a good compression reading on a B? in reply to Geoff, 08-16-2002 11:02:02  

White smoke usually isn't a good sign. Does the engine seem to run okay? The white smoke might be a head gasket starting to loose it's seal and coolant is seeping in, or maybe a crack somewhere. Check the oil and see if you're getting water in the crankcase. Usually oil starts to get "milky" when coolant starts to seep in, and as the engine warms up, a crack or a leaky head gasket would expand & get worst. I Don't mean to sound like Mr. Doom n' gloom, but if you catch a problem like that early, it's an easier and cheaper fix.... Good Luck! Steve

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Rod (NH)

08-17-2002 19:40:07

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 Re: what would be a good compression reading on a B? in reply to Geoff, 08-16-2002 11:02:02  
Hi Geoff,

Check out my post to Smitty up above regarding compression on a C for one opinion :o). The BE engine has a compression ratio of about 5:1. That translates into a maximum theoretical compression pressure of about 125 psig. I personally think that 95-100 psig on a compression test should be considered very good.

Are you using antifreeze in the radiator? White smoke at the exhaust typically indicates that antifreeze is getting into at least one of the cylinders in some way.


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