Info on these tunable runners... How does it work?
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Info on these tunable runners... How does it work? Came across this article a while ago and recently purchased a FAST 102 LS1/LS6 and I'm porting it myself. Shaving down the runners and what not. Here's the article - http://bangshift.com/general-news/ne...ke-combo-grow/.
How do these new runners work? I'm trying to understand what is going on specifically when you change to the different runner (standard, medium and race).
How do these new runners work? I'm trying to understand what is going on specifically when you change to the different runner (standard, medium and race).
The way I understand it is the short (race) runners are pretty much straight into the intake ports of the head, and you'll see gains in the upper RPM range with them. They are kind of like what you'd get out of a single plane intake. The medium runners are probably what you're looking for. You'll see more gains up top, but won't loose a lot of under the curve power.
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From: Coast of San Mateo County Between Pacifica & HMB
If/When these ever become
Available just like the article/add
Says, you can change the runners as your combo or
Track/Street situation changes.
These runners have been
Promised/Late! For at least!
6-9 Months depending on
Port Shape!
Available just like the article/add
Says, you can change the runners as your combo or
Track/Street situation changes.
These runners have been
Promised/Late! For at least!
6-9 Months depending on
Port Shape!
I heard they are holding off on that project for now. But I've heard of people cutting and shaping them there selves. But it basically turns the power band up depending on the shape and length of the runners.
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The way I understand it is the short (race) runners are pretty much straight into the intake ports of the head, and you'll see gains in the upper RPM range with them. They are kind of like what you'd get out of a single plane intake. The medium runners are probably what you're looking for. You'll see more gains up top, but won't loose a lot of under the curve power.
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Verdad Gallardo Yea really... They introduced them a year ago. I know they did it around the time msd introduced their manifold. Don't know if that had anything to do with it. Either way it shouldn't take a year + to get some pieces of plastic to the market
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From: Schererville, IN
Maybe if the claim is "XX horsepower gains!" then they have to do a lot of computational fluid dynamics to get the shape just right. And/or real world testing after they make a new shape. And then maybe CA CARB certification? It's not "just plastic" there is a lot of R&D time put into this stuff.
Of course there is more to it than just a piece of plastic. And I'm also sure when FAST designed the 102 they tried all different length runners. They had this idea in their back pocket for a long time now. What is the real reason they have delayed?...
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From: Norn Iron
They are just bits of plastic, they're just small alterations to an existing manifold from what it appears.
All they needed to do is make them which they already appear to have done, stick them on some engines or give them to suitable companies willing to test them and get feedback as t how they perform.
It really isnt difficult.
But the more and more I search, the more it seems that the long runners simply work and really offer minimal restriction even right at the top end. They help make power/torque everywhere vs short runners except perhaps above 7, 7500rpm etc.
So for 99% of users is the tradeoff worth it ? Maybe lack of the short runners going into production is because of that very thing ?
Even the new crossram from Edelbrock etc...they're talking about long 13" runners not short runners.
Likewise the Vararam if it ever gets going. Long runners seem to just seem to be the way forward.
All they needed to do is make them which they already appear to have done, stick them on some engines or give them to suitable companies willing to test them and get feedback as t how they perform.
It really isnt difficult.
But the more and more I search, the more it seems that the long runners simply work and really offer minimal restriction even right at the top end. They help make power/torque everywhere vs short runners except perhaps above 7, 7500rpm etc.
So for 99% of users is the tradeoff worth it ? Maybe lack of the short runners going into production is because of that very thing ?
Even the new crossram from Edelbrock etc...they're talking about long 13" runners not short runners.
Likewise the Vararam if it ever gets going. Long runners seem to just seem to be the way forward.
They are just bits of plastic, they're just small alterations to an existing manifold from what it appears.
All they needed to do is make them which they already appear to have done, stick them on some engines or give them to suitable companies willing to test them and get feedback as t how they perform.
It really isnt difficult.
But the more and more I search, the more it seems that the long runners simply work and really offer minimal restriction even right at the top end. They help make power/torque everywhere vs short runners except perhaps above 7, 7500rpm etc.
So for 99% of users is the tradeoff worth it ? Maybe lack of the short runners going into production is because of that very thing ?
Even the new crossram from Edelbrock etc...they're talking about long 13" runners not short runners.
Likewise the Vararam if it ever gets going. Long runners seem to just seem to be the way forward.
All they needed to do is make them which they already appear to have done, stick them on some engines or give them to suitable companies willing to test them and get feedback as t how they perform.
It really isnt difficult.
But the more and more I search, the more it seems that the long runners simply work and really offer minimal restriction even right at the top end. They help make power/torque everywhere vs short runners except perhaps above 7, 7500rpm etc.
So for 99% of users is the tradeoff worth it ? Maybe lack of the short runners going into production is because of that very thing ?
Even the new crossram from Edelbrock etc...they're talking about long 13" runners not short runners.
Likewise the Vararam if it ever gets going. Long runners seem to just seem to be the way forward.
You make a very good point.
