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E34 (1989 - 1995)

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  #26  
Old 02-07-2013, 09:17 AM
samsonnyc samsonnyc is offline
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Quote:
Originally Posted by snowsled7 View Post
At that point, the engine needs serious repair or replacement. There are thousands of used engines that fit in these cars for sale cheap, less than a good head repair.

That's how I ended up with this one.

I think I will just repair my head if my piston rings are good.


Quote:
Originally Posted by snowsled7 View Post

Sounds like there are some issues, especially if 12 psi is hissing through.

Which engine is this, M20 or M50. If it is the M20, is the belt service current? Jumping a tooth or two on a worn belt would give you numbers like that but I also think it would be VERY sluggish to drive... that is the stumper.
Its the M50 vanos. Drives fine, although it has normal days and good days. I think I mess up on that leakdown test.

Maybe I don't need to rebuild this head.

Do you recommend immersing a chamber in Berryman's Chem Dip. I turn the crank such that the exhaust valves are open. Fill up the chamber with the dip, will coat the exhaust valves, the piston top and the underside of the intake valves. Then I pour some down the fuel injector's opening to coat the upperside of the intake valves. Soak it down overnight, then run the engine at high rpm to bust off loosed carbon.

Or maybe MMO, or Piston Kleen ? I've read the Piston Kleen loosens up hard carbon great.

Not as good as a full head job but cheaper.

Wait. Oh yeah, you already said no. Ok.

But, do you think this is a good valve 'maintenance' thingy ? Do this once every year? 6 months ?
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  #27  
Old 02-07-2013, 02:55 PM
samsonnyc samsonnyc is offline
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I have been thinking about this all day. It is annoying. There shouldn't be carbon or **** happening on valves and they shouldn't be getting damaged or pitted or what have you and require lapping. If my super old pistons can leakdown at 5% and 8% which is racing quality, what the hell is wrong with the valves?

I have decided to change the way the engine is designed. I have an idea. Wise men, tell me what you think.

Why not have a rotating sprocket wheel above each space on the chamber ? The wheel would have a slot cut into it that rotates into position during the fueling stroke. Air and fuel rushes in. The other wheel's slot rotates into place during the exhaust stroke. Exhaust is pushed out, and its even better because it doesn't have to move around a trumpet to leave. More exhaust gets out. Stronger vacuum is created. So more fuel and air is pulled in later. Combustion is better because there is more oxy and less leftover exhaust. So more power, fuel economy, and hot dogs.

While the slot on one wheel is over the chamber, the other wheel still rotates its slot out, and so closes the chamber on its side. All of this is timed just like the cams are timed now.

The beauty is no carbon can be formed. The rotating wheels are flush with the head and that scrapes carbon off all the time. Stays clean. If necessary, the rotating heads can be easily removed and cleaned out during a vcg job which is cheap to do. They will all have little timing marks so its easy to put them in the right place.

The Rotavalves would be made of composite metal.

No more rebuilding heads !

I need a patent attorney.

Last edited by samsonnyc; 02-07-2013 at 02:58 PM.
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  #28  
Old 02-07-2013, 04:12 PM
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BMR_LVR BMR_LVR is offline
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Sounds similar to a 2 stroke motorcycle engine or a Wankle rotary engine in the Mazda.
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It's Deja Poo - as in, I've heard this **** before.
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1992 525i - Sold
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  #29  
Old 02-07-2013, 06:26 PM
samsonnyc samsonnyc is offline
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Quote:
Originally Posted by BMR_LVR View Post
Sounds similar to a 2 stroke motorcycle engine or a Wankle rotary engine in the Mazda.
Fire the patent attorney.
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  #30  
Old 02-07-2013, 06:31 PM
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BMR_LVR BMR_LVR is offline
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Location: Asheboro, NC
 
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Quote:
Originally Posted by samsonnyc View Post
Fire the patent attorney.
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Most problems are usually something simple !

Quote:
Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.
Steve

Calypso Red 1992 525i with 200K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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  #31  
Old 02-07-2013, 06:50 PM
snowsled7 snowsled7 is offline
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Two strokes go as far as to eliminate the valvetrain altogether. My 700 cc two cylinder 2 stroke makes 140 hp, we have a 1 liter making over 190 @ 8000 rpm. Fuel economy is nothing to brag about though, more horses, more oats
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  #32  
Old 02-07-2013, 08:26 PM
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_Ethrty-Andy_ _Ethrty-Andy_ is offline
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Quote:
Originally Posted by snowsled7 View Post
more horses, more oats
hahaha i like that one mate
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  #33  
Old 02-08-2013, 12:04 AM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
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Mein Auto: E23;E30;E38;E32;E34 +
The rotating valve thing has been done. Didn't last.
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  #34  
Old 02-08-2013, 07:53 AM
samsonnyc samsonnyc is offline
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Originally Posted by BMWFatherFigure View Post
The rotating valve thing has been done. Didn't last.
Fire the engineers too.

My new carbon free engine company is shrinking fast.
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