Dynoed 1170hp/1180ft/lbs today.
01-16-2010, 11:18 PM
#165
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that is an interesting method of keeping the heads down, but i assume you will not be able to do it with the aluminum block because the sleeves are not thick enough, maybe if you install thicker sleeves ?
01-17-2010, 10:06 AM
#166
I just would like to know whats going to help the most cause i can either sell my ported l92s and vic jr intake for a set of 317s for a super vic. My l92s have been milled .030 but flow alot more than the 317s and if the pyrmiding helps that much i would keep them to see how much better they do than not having pyrmided l92s, if that made sence.
01-19-2010, 02:32 AM
#167
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so if i understand this correctly this is the process in the pyramid ring method
1 . over bore the top of the cylinder to a diameter bigger than your bore . if a 4.00 bore than machine top of each bore to 4.125 and .080 deep
2. he modifies a felpro graphite head gasket , essentially boring the gasket out cutting out the fire ring and making the gasket larger than the diameter of the top of the block
3. you place the pyramid rings on the top of all 8 cyls then u place then head gasket on the block
now this essentially gives each cylinder its own head gasket ( pyramid ring ) wich cuts directly into the cylinder head and the felpro head gasket only is used to seal the water and the oil
seems like a very easy proccess it just took awhile to understand
1 . over bore the top of the cylinder to a diameter bigger than your bore . if a 4.00 bore than machine top of each bore to 4.125 and .080 deep
2. he modifies a felpro graphite head gasket , essentially boring the gasket out cutting out the fire ring and making the gasket larger than the diameter of the top of the block
3. you place the pyramid rings on the top of all 8 cyls then u place then head gasket on the block
now this essentially gives each cylinder its own head gasket ( pyramid ring ) wich cuts directly into the cylinder head and the felpro head gasket only is used to seal the water and the oil
seems like a very easy proccess it just took awhile to understand
01-19-2010, 03:35 PM
#171
I don't understand what's so hard to grasp about this process. From everything I've seen and read this setup is solid. The machine work would be cheap and easily doable by any machine shop compared to having siamese ring grooves cut too. You've got a beautiful car man.
01-19-2010, 08:48 PM
#172
What are they made of... And how crucial is the receiver groove in the heads dimensions? Proportionate to the thickness of the gasket? Im guessing if the pyramid rings bottomed out first the gasket wouldnt be compressed properly. How do you get that perfect?
And is there a price on these pyramid rings? This is the last step I need to do before im done w/ my engine.....figure out how to hold the heads on.
And is there a price on these pyramid rings? This is the last step I need to do before im done w/ my engine.....figure out how to hold the heads on.
01-20-2010, 06:08 PM
#174
there is NO receiver groove in the head !
the piramid rings are called that way because they look like piramids
a "triangular" shape with the sharp point sticking up towards the head.
This sharp point "cuts" directly into the aluminium head surface.
Water and oil are separated through use of a "normal" gasket. (without any metal rings around the bores)
The height of the pyramid rings and the thickness of the water/oil gasket need to be matched properly.
Biggest problem is when using very expensive heads, as these rings cut into the aluminum of the head, this requires to have the heads skimmed more often and deeper when the heads need to come off for wathever purpose
This is a proven and reliable (and relative cheap) method being used for quite some years ..
maybe Andreas can show a closeup picture from a head that came of a piramid engine to show how deep these grooves actually cut/ dent the headsurface?
the piramid rings are called that way because they look like piramids
a "triangular" shape with the sharp point sticking up towards the head.
This sharp point "cuts" directly into the aluminium head surface.
Water and oil are separated through use of a "normal" gasket. (without any metal rings around the bores)
The height of the pyramid rings and the thickness of the water/oil gasket need to be matched properly.
Biggest problem is when using very expensive heads, as these rings cut into the aluminum of the head, this requires to have the heads skimmed more often and deeper when the heads need to come off for wathever purpose
This is a proven and reliable (and relative cheap) method being used for quite some years ..
maybe Andreas can show a closeup picture from a head that came of a piramid engine to show how deep these grooves actually cut/ dent the headsurface?
Last edited by jeejee; 01-21-2010 at 12:05 PM.
01-21-2010, 09:58 PM
#176
From reading up on these pyramid rings on different sites and following up on adreas's post on here and the bmw site, they are sold for $600 shipped no matter what the bore size is. I would like to know if andreas has ever used a o-ring or even a fire ring (very similar to pyramid ring) and how they worked for him compared to the pyramid rings? I have a thread about pyramid rings in the forced induction section just waiting for someone with more experence to answer some of my questions.
i would drive it every day
01-24-2010, 12:29 PM
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there is NO receiver groove in the head !
the piramid rings are called that way because they look like piramids
a "triangular" shape with the sharp point sticking up towards the head.
This sharp point "cuts" directly into the aluminium head surface.
Water and oil are separated through use of a "normal" gasket. (without any metal rings around the bores)
The height of the pyramid rings and the thickness of the water/oil gasket need to be matched properly.
Biggest problem is when using very expensive heads, as these rings cut into the aluminum of the head, this requires to have the heads skimmed more often and deeper when the heads need to come off for wathever purpose
This is a proven and reliable (and relative cheap) method being used for quite some years ..
maybe Andreas can show a closeup picture from a head that came of a piramid engine to show how deep these grooves actually cut/ dent the headsurface?
the piramid rings are called that way because they look like piramids
a "triangular" shape with the sharp point sticking up towards the head.
This sharp point "cuts" directly into the aluminium head surface.
Water and oil are separated through use of a "normal" gasket. (without any metal rings around the bores)
The height of the pyramid rings and the thickness of the water/oil gasket need to be matched properly.
Biggest problem is when using very expensive heads, as these rings cut into the aluminum of the head, this requires to have the heads skimmed more often and deeper when the heads need to come off for wathever purpose
This is a proven and reliable (and relative cheap) method being used for quite some years ..
maybe Andreas can show a closeup picture from a head that came of a piramid engine to show how deep these grooves actually cut/ dent the headsurface?
You only need to machine the surface every 2-3 time you lift the head. And then you only need to shave off 0.05 mm.
