SEE it? Hell, Joe WROTE it!randy331 wrote:Come on Joe don't hold back, tell us what you really think.Joe Mendelis wrote: What a load of crap. This is why I don't buy those magazines.
I buy the magazine, I just don't always buy the info.
Hey, did you see the new artical where low lift flow is the most important, because the engine sees it twice, and high lift once? :D
Randy
Lobe seperation question
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Re: Lobe seperation question
[i]"There are some people who, if they don't already know, you can't tell 'em."[b]....Yogi Berra[/b][/i]
[i]"Being able to "think outside the box" presupposes you were able to think in it." [b]--Bob Lutz[/b][/i]
[i]"Being able to "think outside the box" presupposes you were able to think in it." [b]--Bob Lutz[/b][/i]
I too would like to learn more about this.randy331 wrote:Why is that? I would have thought, with full ex, reducing overlap would help mileage. Too early of EVO?SStrokerAce wrote:It IS ONLY FOR IDLE QUALITY, you would get better fuel milage with more overlap than the OEM cams have. The guys in GM Powertrain know this but the platform guys want smooth idles.chevy_power wrote:Is this why gm has gone to wide lsa's for their ls engines? Or is it to perserve the idle quality.
Bret
Randy
Joe
Re: Lobe seperation question
So with low lift flow being so important, maybe we should set up our valve train to have the valve bounce off the seat. Then our engines will see low lift flow 3 or 4 times!!!!!!OldSStroker wrote:SEE it? Hell, Joe WROTE it!randy331 wrote:Come on Joe don't hold back, tell us what you really think.Joe Mendelis wrote: What a load of crap. This is why I don't buy those magazines.
I buy the magazine, I just don't always buy the info.
Hey, did you see the new artical where low lift flow is the most important, because the engine sees it twice, and high lift once? :D
Randy
I guess you wouldn't want the valve to bounce too high, then you'd be accessing mid lift flow!!
Think Joe would help wright that artical??
Randy
Last edited by randy331 on Sat Mar 29, 2008 12:44 pm, edited 1 time in total.
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Re: Lobe seperation question
Most valves do bounce a few times when they close. Let's treat that as a good thing rather than the problem it is.randy331 wrote: So with low lift flow being so important, maybe we should set up our valve train to have the valve bounce off the seat. Then our engines will see low lift flow 3 or 4 times!
Randy
I can see it now on those other "tech" forums:
The newest TOTW (Trick Of The Week)....LLBF
Increase .015-.025 lift flow as much as possible on the intake to take advantage of the bounce. Be very aggressive on the IVC ramp to get more LLBF (Low Lift Bounce Flow). This along with tiny, high subsonic velocity ports will make tons more low end torque.
Do you think we could sell that? I'll ask Joey M. if he can work on that LLBF. I'm thinking he'll probably go for 15°-20° seats and a huge intake valve to get the most curtain area.
We should promote/market them as the LBF heads. We'll let folks figure out what the LBF really means.
Jon
[i]"There are some people who, if they don't already know, you can't tell 'em."[b]....Yogi Berra[/b][/i]
[i]"Being able to "think outside the box" presupposes you were able to think in it." [b]--Bob Lutz[/b][/i]
[i]"Being able to "think outside the box" presupposes you were able to think in it." [b]--Bob Lutz[/b][/i]
Re: Lobe seperation question
Randy, I did write about how great it is to have all that sweet low-lift flow for more "torque". It was supposed to be on the newsstands Tuesday!randy331 wrote:So with low lift flow being so important, maybe we should set up our valve train to have the valve bounce off the seat. Then our engines will see low lift flow 3 or 4 times!!!!!!OldSStroker wrote:randy331 wrote: Come on Joe don't hold back, tell us what you really think.
I buy the magazine, I just don't always buy the info.
Hey, did you see the new artical where low lift flow is the most important, because the engine sees it twice, and high lift once? :D
Randy
SEE it? Hell, Joe WROTE it!
I guess you wouldn't want the valve to bounce too high, then you'd be accecing mid lift flow!!
Think Joe would help wright that artical??
Randy
Jon, the LBF "Low Bounce Flow" head is coming along. So far we have tons of torque. The top secret VJ specs are 0* topcut .300 wide, 15* seat .080 wide, then a 30, 45, 60, 75, 90. You can NEVER have more than 15* difference in the valve job angles; Remember, the air can't make that turn!
So to take advantage of LLBF, one would need to increase valve bounce.
So what valve material will increase valve bounce?
Would it be better to have the valve bounce several times real low, or one or two times a little higher?
I guess this would depend on what the flow #s were from your,
"LLBF bench"
Randy
So what valve material will increase valve bounce?
Would it be better to have the valve bounce several times real low, or one or two times a little higher?
I guess this would depend on what the flow #s were from your,
"LLBF bench"
Randy
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The key to making the LLBF head work is this valve. (also known as the "Pogo valve")randy331 wrote:So to take advantage of LLBF, one would need to increase valve bounce.
So what valve material will increase valve bounce?
Would it be better to have the valve bounce several times real low, or one or two times a little higher?
I guess this would depend on what the flow #s were from your,
"LLBF bench"
Randy
Automotive Machining, cylinder head rebuilding, engine building. Can't seem to quit
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I like it! We could make the "ballast mass" (BM) from Mallory metal so it wouldn't protrude too far into the chamber and maybe raise the compression ratio unacceptably high (>10.0:1).Keith Morganstein wrote: The key to making the LLBF head work is this valve. (also known as the "Pogo valve")
With the pogo feature we could tune the valve to have max bounce either at torque peak or hp peak (if they were at different rpm).
Jon
[i]"There are some people who, if they don't already know, you can't tell 'em."[b]....Yogi Berra[/b][/i]
[i]"Being able to "think outside the box" presupposes you were able to think in it." [b]--Bob Lutz[/b][/i]
[i]"Being able to "think outside the box" presupposes you were able to think in it." [b]--Bob Lutz[/b][/i]
Maybe we could set it up to bounce more with increased rpm. Then there would be no end to the power potential, or rpm it made it at.OldSStroker wrote: With the pogo feature we could tune the valve to have max bounce either at torque peak or hp peak (if they were at different rpm).
I guess in an engine like this, the more out of control the valve train, the more HP.
Randy
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There are so many engnes like that around that we need get the LBF heads on the market soonest!randy331 wrote: Maybe we could set it up to bounce more with increased rpm. Then there would be no end to the power potential, or rpm it made it at.
I guess in an engine like this, the more out of control the valve train, the more HP.
Randy
Jon
[i]"There are some people who, if they don't already know, you can't tell 'em."[b]....Yogi Berra[/b][/i]
[i]"Being able to "think outside the box" presupposes you were able to think in it." [b]--Bob Lutz[/b][/i]
[i]"Being able to "think outside the box" presupposes you were able to think in it." [b]--Bob Lutz[/b][/i]
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Greezer wrote:How about a solenoid actuated valve .
Thats been what tried for so long now. Guess nobody has got it to work perfect for a long time yet. This way the computer could control the valves and have a short duration at low rpm and longer duration at higher rpms.
As its now, you just run a high stall converter and forget low rpms but the new cars can't do that.
They get it done someday-you would think.
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How about an overhead cam with just a bunch of speed bumps on it??Greezer wrote: How about a solenoid actuated valve - just bouncing the valve repeatedly for the event? It could be contained within the confines of what is now the boss, giude, and stem. Maybe triggered off the crank. No cam, lifters or pushrods to worry about,.
I like this! In one thread we've introduced several new very advanced engine terms to the racing world.Greezer wrote: just mapping the LLBF for the maximum low lift bounce factor (MLLBF). Maybe a metal film vacuum coated ceramic valve.
LLBF
LLBF head
LLBF bench
just to name a few, and the newest, and my favorite.
Maximum Low lift Bounce Factor, but that would add a new term,
Maximum Low Lift Bounce Flow Factor.
I can't wait to read Joe's next magazine article!!
Randy