Thoughts on intake plenum size?
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Joined: Mar 2014
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From: Ohio
extending length runners seems like a nightmare. You're moving the entire plenum, so sensors, throttle body/cable, intake tubing will all move. For a V8, the runners would have to all be perfectly parallel. Multiple runners and butterflies are way easier. Long runners and short runners. Short runners are closed off with a butterfly valve until set conditions.
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Joined: Jul 2014
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From: My own internal universe
they way I imagined it was a fixed plenum. Technically as runners gain length, you lose plenum, but at low RPM, that is OK. Then as the runners shrink, the plenum grows. I sort of figured both the low and high RPM conditions would work out that way, which would allow constant cable position, etc. Presumably, longer runners would reduce reversion and help tame idle??
But this is really just imagineering....
Now, watch Lance post up he did something like this five years ago. Dude is so far ahead of the curve it's scary.
But this is really just imagineering....
Now, watch Lance post up he did something like this five years ago. Dude is so far ahead of the curve it's scary.
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Joined: Mar 2014
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From: Ohio
Spread length ITBs are probably the way to go. You'll need to be able to read/adjust individual cylinder trims. Your runners will be different lengths to spread the RPM efficiencies out.
Look up the Cadillac engines that finished 1st and 2nd place at the 24 hours of Daytona last year.
Look up the Cadillac engines that finished 1st and 2nd place at the 24 hours of Daytona last year.
they way I imagined it was a fixed plenum. Technically as runners gain length, you lose plenum, but at low RPM, that is OK. Then as the runners shrink, the plenum grows. I sort of figured both the low and high RPM conditions would work out that way, which would allow constant cable position, etc. Presumably, longer runners would reduce reversion and help tame idle??
But this is really just imagineering....
Now, watch Lance post up he did something like this five years ago. Dude is so far ahead of the curve it's scary.
But this is really just imagineering....
Now, watch Lance post up he did something like this five years ago. Dude is so far ahead of the curve it's scary.
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Joined: Jun 2016
Posts: 22,303
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From: Central Cal.
F1- now THOSE are the scary bunch, using the highest tech stuff around (WITH accompanying budget...) and I can imagine Lance being right in the thick of it! He knows SO much stuff....
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From: PDX-OR-USA
The mazda ITB's had a telescoping velocity stack, it was activated by a pneumatic cylinder, IIRC it only moved between short/Medium/Long, and with the rotary RPM, that meant they only moved exiting the turns and during braking.
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Joined: May 2009
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From: over dere
they way I imagined it was a fixed plenum. Technically as runners gain length, you lose plenum, but at low RPM, that is OK. Then as the runners shrink, the plenum grows. I sort of figured both the low and high RPM conditions would work out that way, which would allow constant cable position, etc. Presumably, longer runners would reduce reversion and help tame idle??
But this is really just imagineering....
Now, watch Lance post up he did something like this five years ago. Dude is so far ahead of the curve it's scary.
But this is really just imagineering....
Now, watch Lance post up he did something like this five years ago. Dude is so far ahead of the curve it's scary.
I used to try to engage in conversation with him, then I learned to shut up and listen only when he speaks/types.
Where's he been anyway?
Thread Starter
Joined: Jul 2014
Posts: 10,450
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From: My own internal universe
Originally Posted by 00pooterSS
When I first read some of his posts, I thought he was crazy. Then it set it as I read more and a good quote came to mind "to some people, really smart people sound like crazy people"
I used to try to engage in conversation with him, then I learned to shut up and listen only when he speaks/types.
Where's he been anyway?
I used to try to engage in conversation with him, then I learned to shut up and listen only when he speaks/types.
Where's he been anyway?
Guy at work was like that too. He would randomly say something like -- we need to build a road right here -- and everyone would laugh. Three years later nobody knows how we ever survived without that road.
I'm not sure English is Lance's first language so sometimes it's hard to understand what he means. Or maybe it's just how he communicates that makes it hard to understand.
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From: Central Cal.
I'm pretty sure English is his first language, though he is from New Zealand, so their version of English is a wee bit different than ours; very similar to Australian English.
I talked to him a few weeks back. He kind of posts up in spurts. More than anything I see him in the advanced engineering section (go figure)
Guy at work was like that too. He would randomly say something like -- we need to build a road right here -- and everyone would laugh. Three years later nobody knows how we ever survived without that road.
Guy at work was like that too. He would randomly say something like -- we need to build a road right here -- and everyone would laugh. Three years later nobody knows how we ever survived without that road.
I really wish I worked with someone like that still. I did for about 10 years but for the past 5 or so.. man these guys impress me when they come in with their pants on the right direction.. It's really depressing.
It's definitely different, at first I thought he was whacky cause his english is fairly broken and the stuff he was posting about. Then I realized he's just that far ahead.