Staggered intake valve lash? & Analysis of intake flow
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Staggered intake valve lash? & Analysis of intake flow
Hello everyone. New member here. So my question is can any benefit or harm be derived from setting the two intake valve lashes for a particular cylinder in a honda head to the opposite ends of the recommended spec or beyond? As an example, setting one valve at .12mm and the other at .08mm or at an even greater disparity like .15mm and .05mm. Has this been done? If not, I’d like to try but without risk of damaging the valve train. Any intelligent insight would be appreciated.....
.... I was looking into the idea of offsetting or staggering the intake valve lash on my b18a1 in order to induce swirl in the combustion chamber. During my quest for answers as to whether this was a rediculous idea or not, I found an interesting article relating to the flow characteristics of an air/fuel mixture within the chamber and the effect that turbulence has upon it. I learned a lot from it so I thought I’d share with you! It’s attached below. Be warned, it’s a long read and includes some mind bending mathematics.
FYI This is my FIRST post on a forum ever. Don’t beat me up too bad.
.... I was looking into the idea of offsetting or staggering the intake valve lash on my b18a1 in order to induce swirl in the combustion chamber. During my quest for answers as to whether this was a rediculous idea or not, I found an interesting article relating to the flow characteristics of an air/fuel mixture within the chamber and the effect that turbulence has upon it. I learned a lot from it so I thought I’d share with you! It’s attached below. Be warned, it’s a long read and includes some mind bending mathematics.
FYI This is my FIRST post on a forum ever. Don’t beat me up too bad.
Last edited by Free Man; Jun 7, 2018 at 10:02 AM.
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Re: Staggered intake valve lash? & Analysis of intake flow
That's an interesting idea. I don't know enough about it to really say whether it would make a difference or not, but I can say I seriously doubt you would have any safety issues with the valvetrain. Many people neglect valve lash for a long time without serious issues.
I would be very interested in seeing back to back dyno runs experimenting with this.
I would be very interested in seeing back to back dyno runs experimenting with this.
Thread Starter
Honda-Tech Member
Joined: Jun 2018
Posts: 262
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Re: Staggered intake valve lash? & Analysis of intake flow
That's an interesting idea. I don't know enough about it to really say whether it would make a difference or not, but I can say I seriously doubt you would have any safety issues with the valvetrain. Many people neglect valve lash for a long time without serious issues.
I would be very interested in seeing back to back dyno runs experimenting with this.
I would be very interested in seeing back to back dyno runs experimenting with this.
Dyno runs would indeed yield good info. The idea was spawned from the need to reduce knock tendency by mechanical means So as to safely increase compression. I’d be interested to see what effects it has on fuel efficiency also!
Thread Starter
Honda-Tech Member
Joined: Jun 2018
Posts: 262
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Re: Staggered intake valve lash? & Analysis of intake flow
That's an interesting idea. I don't know enough about it to really say whether it would make a difference or not, but I can say I seriously doubt you would have any safety issues with the valvetrain. Many people neglect valve lash for a long time without serious issues.
I would be very interested in seeing back to back dyno runs experimenting with this.
I would be very interested in seeing back to back dyno runs experimenting with this.
I also had already considered the fact that neglected lash adjustment leads to out of spec clearances, but I can’t imagine the valves would loosen in a way that would lead to such a disparity between the two. My worry is that the uneven kinetic forces exerted on the rockers might cause some type of out of whack (sonic?) vibrations that would do damage over time.
Last edited by Free Man; Jun 7, 2018 at 12:02 PM.
Thread Starter
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Re: Staggered intake valve lash? & Analysis of intake flow
Yeah I’m sure I will. Thanks for the encouragement fellas. I had no luck finding anything online on this topic. I’m thinking the effect must be so negligible that no one bothered to mention it.... I’d be surprised if this has never been tried before. I’m going to do it on Monday if the weather is nice, I’ll keep you posted.
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Re: Staggered intake valve lash? & Analysis of intake flow
Yea man if you have an idea, i say go for it. Honestly not many people are willing to go and learn on their own, they rather copy and paste for the most part. But then there's those here who do tech and that's why im here.
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