Siamesed bores and engine modifications
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 7,218
Likes: 1
From: Cresskill NJ
Siamesed bores and engine modifications
I'm assuming that now that we have siamesed bores tuners will be able to bore the cylinders out with less chances of complications. Also, just by stroking alone this gives a much better starting point.
I'm thinking also that this engine will respond very well to forced induction once the compression is lowered. Especially once Chevy releases the 3 valve heads.
I think a lot of the Vette's competition will be getting some big suprises :cheers:
I'm thinking also that this engine will respond very well to forced induction once the compression is lowered. Especially once Chevy releases the 3 valve heads.
I think a lot of the Vette's competition will be getting some big suprises :cheers:
Le Mans Master
Joined: Aug 2000
Posts: 8,762
Likes: 2
From: Murphy TX
Re: Siamesed bores and engine modifications (DngrZne)
I hope this isn't considered hijacking the thread, but can someone explain 'siamesed bores'? I'm not quite picturing what the heck that means.
:cheers:
:cheers:
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 7,218
Likes: 1
From: Cresskill NJ
Re: Siamesed bores and engine modifications (yellow01)
I hope this isn't considered hijacking the thread, but can someone explain 'siamesed bores'? I'm not quite picturing what the heck that means.
:cheers:
:cheers:
Drifting
Joined: Feb 2002
Posts: 1,260
Likes: 0
From: Chapel Hill NC
Re: Siamesed bores and engine modifications (DngrZne)
Actually iron. They're still using sleves. Old trick is to drill small hole at the top of the piston stroke between the cylinders in the joining material. Another about a half inch lower. Supposedly lets some water flow through between the cylinders to help cooling. :cool:
[Modified by I Bin Therbefor, 1:45 AM 1/6/2004]
[Modified by I Bin Therbefor, 1:45 AM 1/6/2004]
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 7,218
Likes: 1
From: Cresskill NJ
Re: Siamesed bores and engine modifications (I Bin Therbefor)
Depends how close the liners are coming to each other. The engine has a 4.4" bore center with 4" bores leaving .4" between the cylinders. I believe the liners are relatively thin, so most of this extra space beteen the cylinders will still be aluminum, but it will also leave much more room for boring out the cylinders without worrys of hitting the cooling jacket. :cheers:
Race Director
Joined: May 2000
Posts: 12,712
Likes: 2,264
Re: Siamesed bores and engine modifications (I Bin Therbefor)
Actually iron. They're still using sleves. Old trick is to drill small hole at the top of the piston stroke between the cylinders in the joining material. Another about a half inch lower. Supposedly lets some water flow through between the cylinders to help cooling. :cool:
[Modified by I Bin Therbefor, 1:45 AM 1/6/2004]
[Modified by I Bin Therbefor, 1:45 AM 1/6/2004]
Duke
Burning Brakes
Joined: Feb 2000
Posts: 1,195
Likes: 1
From: East Bay CA
Re: Siamesed bores and engine modifications (DngrZne)
Here's a recent GM patent on an aluminum siamese cylinder block. I think this
is directly relevant to Gen IV.
http://patft.uspto.gov/netacgi/nph-P...1&RS=6,349,681
is directly relevant to Gen IV.
http://patft.uspto.gov/netacgi/nph-P...1&RS=6,349,681
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Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 7,218
Likes: 1
From: Cresskill NJ
Re: Siamesed bores and engine modifications (Runge_Kutta)
Here's a recent GM patent on an aluminum siamese cylinder block. I think this
is directly relevant to Gen IV.
http://patft.uspto.gov/netacgi/nph-P...1&RS=6,349,681
is directly relevant to Gen IV.
http://patft.uspto.gov/netacgi/nph-P...1&RS=6,349,681
Interesting read :cheers:
Instructor
Joined: Jan 2004
Posts: 213
Likes: 0
From: houston tx
Re: Siamesed bores and engine modifications (DngrZne)
Runge, thanks, that patent drawing is exactly the info I was looking for when I registered for this forum. How thick are those sleeves anyway? :thumbs:
Le Mans Master
Joined: Jan 2003
Posts: 6,298
Likes: 0
From: Tyler TX
Re: Siamesed bores and engine modifications (DngrZne)
I hope this isn't considered hijacking the thread, but can someone explain 'siamesed bores'? I'm not quite picturing what the heck that means.
:cheers:
It means there are no cooling jackets in between the cylinders, just aluminum.
:cheers:
It means there are no cooling jackets in between the cylinders, just aluminum.
Drifting
Joined: Feb 2002
Posts: 1,260
Likes: 0
From: Chapel Hill NC
Re: Siamesed bores and engine modifications (Runge_Kutta)
Much more efficient solution than drill holes or cast slots. Wonder how they got the heat pipe to work with all the vibrations and g loads on the working fluid. :cool:
