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cdx2k1 wrote:Finally 2 sensible answersDoes compression ratio have anythinjg to do with it?
ingalook wrote:An oh yeah... you could never have the correct AF to run at that RPM without vtec... if you build an engine with that type of tune it would not be able to idle !
ingalook wrote:Any engine that crosses 6500rpm needs some sort of variable lift tech, <---- what varible lift tech u speak about?
like VTEC, VVT-i etc to give it the ability to idle and rev when needed... and that's why Audi can build a production V8 with a 8200rpm redline
i could build a HIGH revving STOCK b20 block with b16a vtec head, rev the sheit out of it,
it WILL break at 9000rpm soon enuff! even tuned unbuilt it will break soon.
why? it has vtec dosent it? but why does it break?
because its a LARGE 84mm bore, THIN 1 piece sleeve, and a long rod to stroke ratio 89mm. vs the ideal bullerproof b16 77.4 stroke.
its all about torque vs horsepower, pistons speed and gearing
The perfect ratio is 1.75. If the ratio is off, it means that the rod is not using 100% of it’s momentum to compress the air and gas mixture. It’s using more energy to push against the sides of the cylinder walls than to compress the fuel mixture. This is normally not too bad because things are very well lubricated in your engine. But when you change certain aspects of the engine, in particular increasing the ECU fuel cutoff point or going forced induction, the imperfect R/S ratio will cause more stress on the engine block and could eventually destroy it. A good R/S ratio also ensures long engine life.
the b16 have near perfect RS and the gearing to go with it. torque to pull the car, but lots more power to speed things along
b20 RS is about 1.52, can't handle high RPM, because of it RS but it has alots of torque.
cams just let the motor breathe at higher RPMs
Higher CR adds torque.
i could build a HIGH revving STOCK b20 block with b16a vtec head, rev the sheit out of it,
it WILL break at 9000rpm soon enuff! even tuned unbuilt it will break soon.
why? it has vtec dosent it? but why does it break?
because its a LARGE 84mm bore, THIN 1 piece sleeve, and a long rod to stroke ratio 89mm. vs the ideal bullerproof b16 77.4 stroke.
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