Thread: under pressure

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Pat, thanks so much for your feedback.

It seems like we aren't looking at it from the same perspective.

With mechanical valve timing, you cannot change the lift or duration.

With electronically controlled hydraulic actuator, throw out the rule book. Notch the pistons, and you can leave them open 360*, if you like.

What I am thinking, is you close the valve well before tdc, you reduce the amount of air drawn in. Now your 350 running 11: 1 static compression is developing cylinder pressure no greater than a stock 8:1 compression motor.

The valve overlap is modified, your 11:1 motor is running smooth and docile, you can even pump low octane so save $$ on your daily commute. Then tank up with av gas, drive to the track, flip a switch, and the beast rumbles and crackles ready to make asphalt scream for mercy.

Originally Posted by firebird77clone

Pat, thanks so much for your feedback.

It seems like we aren't looking at it from the same perspective.

With mechanical valve timing, you cannot change the lift or duration.

With electronically controlled hydraulic actuator, throw out the rule book. Notch the pistons, and you can leave them open 360*, if you like.

What I am thinking, is you close the valve well before tdc, you reduce the amount of air drawn in. Now your 350 running 11: 1 static compression is developing cylinder pressure no greater than a stock 8:1 compression motor.

The valve overlap is modified, your 11:1 motor is running smooth and docile, you can even pump low octane so save $$ on your daily commute. Then tank up with av gas, drive to the track, flip a switch, and the beast rumbles and crackles ready to make asphalt scream for mercy.

nope.. i think your going to bleed down a hi CR engine to gaine??. not going to work like you think. to reduce intake draw by then haning what ever valve you want open or keep shut . you never said carb or fuel injection maybe your ideal would work better as a 2 stroke gas engine with a variable blower boost ? many ways to go. many have been done . from a 8to 1 to 10to1 every thing the same in the engines. gain may not be more 30 hp this maybe it abit generous . that why i said 17to1 cr would have to be better to make worth the work .the cam in the 10to1 is going to add some hp and rpm. there still port flow port size and how the fuel air mix and CFM of with ever you pulling air threw the intake . a rotory valve engine with a variable rotory timing would be nother way no valve in the way . piston can be made and chamber for the best burn . honestly i just realy can not see it you way... as a engine builder i want to keep the intake valve open a fair amont of time . you dening the engine breath and helping some of this is over lap both valve off the seat.nother thing to look at is the pistons start it.s way you say your going to move the cam by moving valve open timing ? by how much ? you need watch that ex valve . a lot of things go on in a engine somethings that many claim to know .i do not. i only know how to machine them and on a good day i know what cam and cr in the real world works build them and make good power. i do not know if it on the web but the engine with just a piston no crank call spilt fire ? piston were on a geneva gear .