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+--- Thread: 2014 Impala engine gets a high-tech lift (/thread-17962.html)
Pages: 1 2
RE: 2014 Impala engine gets a high-tech lift - docCarter - 09-17-2012 12:35 PM
Does that mean I'll be able to scream Vtec?
Jokes aside, nice.
RE: 2014 Impala engine gets a high-tech lift - REVolution - 09-17-2012 12:36 PM
Ok, so when you want the performance profile, it extends the pushrod (so to speak) so that it pushes the valve down further allowing more air to flow in?
In Eco Mode, it retracts the push rod so it allows less air?
Is that what I am supposed to see it as?
From the pic you have there, Spook, it looks like it pushes the outer casing up into the push rod so its a shorter stroke for the rod to travel.
RE: 2014 Impala engine gets a high-tech lift - jspookss - 09-17-2012 12:40 PM
RevOver9000;231313 Wrote:Ok, so when you want the performance profile, it extends the pushrod (so to speak) so that it pushes the valve down further allowing more air to flow in?
In Eco Mode, it retracts the push rod so it allows less air?
Is that what I am supposed to see it as?
From the pic you have there, Spook, it looks like it pushes the outer casing up into the push rod so its a shorter stroke for the rod to travel.
Yup. Its pretty much that damn simple.
Simple and ingenious at the same damn time.
RE: 2014 Impala engine gets a high-tech lift - jspookss - 09-17-2012 12:41 PM
docCarter;231312 Wrote:Does that mean I'll be able to scream Vtec?
Jokes aside, nice.
You could scream HIGH LIFT PROFILE!!!!!
But it wouldn't be as cool
RE: 2014 Impala engine gets a high-tech lift - REVolution - 09-17-2012 12:43 PM
jspookss;231317 Wrote:RevOver9000;231313 Wrote:Ok, so when you want the performance profile, it extends the pushrod (so to speak) so that it pushes the valve down further allowing more air to flow in?
In Eco Mode, it retracts the push rod so it allows less air?
Is that what I am supposed to see it as?
From the pic you have there, Spook, it looks like it pushes the outer casing up into the push rod so its a shorter stroke for the rod to travel.
Yup. Its pretty much that damn simple.
Simple and ingenious at the same damn time.
Yea! Its a lot more simple than I thought it was going to be.
RE: 2014 Impala engine gets a high-tech lift - RougeRiver - 09-17-2012 12:50 PM
RevOver9000;231301 Wrote:Ok, I'm probably going to sound etremely stupid.
The cam, sits inside the block, in the lower part of the engine. The pushrods run inside the block up to the heads and push the lifters up to lower the valves on the other side of the lifters. When you say the lifter is in the block, is the new generation of the small block different in that regard and everything is moved around?
A lifter has always been in the block in an OHV engine. The pushrod sits on a surface that is under oil pressure. That way, there is no need for a lash adjustment. The oil pressure moves the surface to take up any wear in the system resulting from valve stem or seat wear. Pushrods made from hollow tubes with pinholes on both ends allows the lifter to provide top end lubrication without using oil holes in the castings or external lines. The fact that one does not have to get a pain in the ass valve lash check as part of normal service was icing on the cake.
I call the lifter a lash adjuster because that is on of its functions.
Ed Cole was a very smart man.
RE: 2014 Impala engine gets a high-tech lift - RougeRiver - 09-17-2012 12:58 PM
jspookss;231311 Wrote:Now that's the old version for DOD. But its similar in concept. Since this iteration they have a variable fluid ratio that acts like this newer multi profile system.
Before it was just kind of an on and off switch for cylinder deactivation. Now its currently used to vary timing as well.
I haven't seen any leaks on what the system will look like for the new gen V8's
I got cued into what they are up to by a very well written post at GMI by someone debunking every dated criticism of OHV. The writer posted some diagram of OHV with variable profiles that I traced to printed patent publications. If I use kind of wierd terms of anacronyms in my posts it is because that makes it easier for a reader to do a technical literature search of the subject.
I look forward to the next generation V8 from GM.
RE: 2014 Impala engine gets a high-tech lift - jspookss - 09-17-2012 01:58 PM
RougeRiver;231331 Wrote:jspookss;231311 Wrote:Now that's the old version for DOD. But its similar in concept. Since this iteration they have a variable fluid ratio that acts like this newer multi profile system.
Before it was just kind of an on and off switch for cylinder deactivation. Now its currently used to vary timing as well.
I haven't seen any leaks on what the system will look like for the new gen V8's
I got cued into what they are up to by a very well written post at GMI by someone debunking every dated criticism of OHV. The writer posted some diagram of OHV with variable profiles that I traced to printed patent publications. If I use kind of wierd terms of anacronyms in my posts it is because that makes it easier for a reader to do a technical literature search of the subject.
I look forward to the next generation V8 from GM.
