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ORIGINAL: pauly


ORIGINAL: Indi9xx

With valves modification to the profile over the years has been a hot subject. In particular there are modifications which can be used to allow you to use a cam with more overlap while controlling flow direction and reducing low rpm backflow during the cycle. As for valve mods to improve swirl, its one of those things that it would be interesting to experiment with.
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Are these the valves that were around 20+ years ago with a groove machined into the face of the inlet valve to limit back flow during overlap and a step on the back of the exhaust valve that supposedly reduced exhaust backflow ?.
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Your probably thinking of the Rimflow valves which were often in vogue in the late 80's which are a good idea on paper, never had a chance to test any Rimflow's. There are very similar things that can be done but I need to keep some things close to my chest.
 
ORIGINAL: Diver944
ORIGINAL: Indi9xx
about the same time as I found myself loosing traction at 120 mph as it happens!
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No wonder my rear tyres are always bald after a service [;)]
Just kidding - they are always fine
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After experiencing that once there is only two times I will push the throttle all the way down on one of our 3.2 944 Turbo hybrids and thats if (1) the engine is switched off or (2) the car is strapped down to a dyno!

 
ORIGINAL: Indi9xx

ORIGINAL: pauly


ORIGINAL: Indi9xx

With valves modification to the profile over the years has been a hot subject. In particular there are modifications which can be used to allow you to use a cam with more overlap while controlling flow direction and reducing low rpm backflow during the cycle. As for valve mods to improve swirl, its one of those things that it would be interesting to experiment with.
Click to expand...

Are these the valves that were around 20+ years ago with a groove machined into the face of the inlet valve to limit back flow during overlap and a step on the back of the exhaust valve that supposedly reduced exhaust backflow ?.
Click to expand...

Your probably thinking of the Rimflow valves which were often in vogue in the late 80's which are a good idea on paper, never had a chance to test any Rimflow's. There are very similar things that can be done but I need to keep some things close to my chest.
Click to expand...

That's them, couldn't rember the name, think there was an issue with carbon build up that needed removing fairly often to maintain the benefit.
 
ORIGINAL: Indi9xx
later this year, its still at an early stage right now.
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Just thought I would bump up this post to ask how far you have been with the custom intake.

Any news on this?
 
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