Making an intake runner thinks it's longer?

General engine tech -- Drag Racing to Circle Track

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digger
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Re: Making an intake runner thinks it's longer?

Post by digger » Fri Mar 09, 2018 4:26 pm

Less taper makes act a bit longer

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Re: Making an intake runner thinks it's longer?

Post by LSP » Sun Mar 11, 2018 8:35 am

427dart wrote:
Thu Mar 08, 2018 10:00 am
Let's say you have a tunnel ram type intake manifold that has runners shorter than you want for a particular RPM/ HP range.
Say for example the runner is 6 inches in length and results in power range from 5000-7500 RPM.
Would adding a divider about .090 in thickness and 4 inches in length centered in the runner speed the airflow up thus moving the power range down
to 3500-6500?
Just one of those "what if" ideas!
The 4" longer intake tract will have a power range of 2350 rpm less.
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Re: Making an intake runner thinks it's longer?

Post by In-Tech » Sun Mar 11, 2018 5:26 pm

Make some custom reed valves between the intake manifold and head port entry.
Heat is energy, energy is horsepower...but you gotta control the heat.
-Carl

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Re: Making an intake runner thinks it's longer?

Post by groberts101 » Sun Mar 11, 2018 6:23 pm

In-Tech wrote:
Sun Mar 11, 2018 5:26 pm
Make some custom reed valves between the intake manifold and head port entry.
And when you figure that kinda deal out let me know. I'll have the cash ready. :D

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Re: Making an intake runner thinks it's longer?

Post by In-Tech » Sun Mar 11, 2018 8:37 pm

groberts101 wrote:
Sun Mar 11, 2018 6:23 pm
In-Tech wrote:
Sun Mar 11, 2018 5:26 pm
Make some custom reed valves between the intake manifold and head port entry.
And when you figure that kinda deal out let me know. I'll have the cash ready. :D
Figuring it out and making it work is one thing, making it live is a whole 'nother. :shock: :mrgreen:
Heat is energy, energy is horsepower...but you gotta control the heat.
-Carl

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Re: Making an intake runner thinks it's longer?

Post by MadBill » Sun Mar 11, 2018 9:58 pm

I've seen the parts for experimental reed valve systems for a pushrod V-6 and ditto a V-8 but neither made it out of the lab. I think Alfa Romeo produced a reed valve 4 stroke.
Felix, qui potuit rerum cognscere causas.

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Re: Making an intake runner thinks it's longer?

Post by In-Tech » Mon Mar 12, 2018 12:13 am

I brought it up because a lot of good ideas need development to make them work and live. Keeping the mass flow increasing in a tapered runner is easy, getting it started is hard. The reversion is the biggest thing that makes a "large" port act lazy. If you can get the same mass flow into the cylinder a thousand rpm sooner because of a reed and it loses loss of mass flow a thousand sooner than its original peak, isn't that what we are talking about? \:D/
Heat is energy, energy is horsepower...but you gotta control the heat.
-Carl

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