turbos and high compression??

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Originally Posted by ProECU

The real reason why boost + high CR is "perceived" to be a bad idea is becuase ignition of a compressed mixture is not only harder to achieve in the same amount of time, it also becomes unstable.

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So would you say that a more powerfull ignition system (bigger gap, fatter spark) could help here?

yes, but remember, efficient combustion is a controlled burn.

hey just curious,where you guys pull your power estimates from?

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Originally Posted by EKVTIR-T

hey just curious,where you guys pull your power estimates from?

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things i have read & seen and people i have talked with.

*bennjamin edit*

Sounds like another troll on the forums...

once you boost a motor it is upping the compression on it anyway,
hence a motor with a standard high compression like 10:1 or 11:1 will only handell a small amount of boost on average eg 5lbs. ideal compression for a turbocharger is around 7:1 or 8:1 this can be achieved by useing a decompression gasket or some dished forged pistons.
A non vtec motor will be easier to turbo charge because they have a lower compression then the vtec. Most D series non vtec motors are around 9:2:1 which can handell around9lbs on standard internals. A b16a or h22 would only handell around 5psi standard

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Originally Posted by Lyle_Style

once you boost a motor it is upping the compression on it anyway,
hence a motor with a standard high compression like 10:1 or 11:1 will only handell a small amount of boost on average eg 5lbs. ideal compression for a turbocharger is around 7:1 or 8:1 this can be achieved by useing a decompression gasket or some dished forged pistons.
A non vtec motor will be easier to turbo charge because they have a lower compression then the vtec. Most D series non vtec motors are around 9:2:1 which can handell around9lbs on standard internals. A b16a or h22 would only handell around 5psi standard

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Dropping down to 7:1 and 8:1 is a little excessive for a street car don't you think, especially a B series?

whats the average lifespan of a thick, decompression headgasket? There is alot more material then a normal gasket, so wouldnt i get eaten away easier/faster? opinions?

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Originally Posted by Weq

whats the average lifespan of a thick, decompression headgasket? There is alot more material then a normal gasket, so wouldnt i get eaten away easier/faster? opinions?

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That is a factor, but from what I have read/heard the biggest issue is that you are reducing the quench because of the increased clearance between the piston at TDC and the head. Which of course increases the chances of detonation... Having said that though, some of the results Mr Toda has posted for stock B16A with thick head gasket are pretty impressive :)

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Originally Posted by PhatSol

Dropping down to 7:1 and 8:1 is a little excessive for a street car don't you think, especially a B series?

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Maybe a little excessive, but i know a bloke running a 6:2:1 compression with tough thick gaskets and all forged internals and its basically preped for 35psi
but yeh basically just how much boost u want, the more u want the lower you go and the deeper your pockets have to be
8:1 is a good compression as it will be still pretty torquey off boost down low and be able to easily handel 15lbs - 18lbs safely (depending on your cooling setup of course)