Obviously it is designed to absorb engine vibrations, but what specs does it need to meet in order to be SFI approved? Also why does NHRA require this part?

This kinda stems from the fact that the Evolution Ind. damper looks a lot different from the Fluidamper?

Bryson

 

ttt

 

I'm not sure on the exact reason for the requirement.... but I think it has to do with old v8's exploding back in the day. Hopefully old guy will chime in.

I don't know much about what is required from a damper to get the SFI approval, however I don't think its much because the evolution pulley is SFI approved and it is not a damper (see link: https://honda-tech.com/zerothread?id=984831)

After researching and owning the fluidampr, I wouldn't buy any other one. Its awesome. I personally would get a little scared of running a high-HP setup with a non-dampening pulley even if it is SFI approved.

 

Yeah, unfortunetly, I already installed the Evolution Pully...

I'm just wondering what makes it "SFI approved"

And from what was said in the previous thread, it doesn't appear to be an underive pulley. It just doesn't have the AC/power steering ribs.

 

we carry the Evolution pulley and I used to hang out at Evolution while they were developing many of the products they have now.
The SFI is just a certification that they have tested the part to meet certain standards. SFI was started to have a Foundation that everyone can follow.
Im not sure on the actual requirements, but lets say like the Pulley, it would have to be spun at a certain RPM, maybe 12-13K RPM and tested for quality.

From what the Engineers told me at Evolution, dampener is usually associated with the old style pulleys from domestic cars. they needed dampeners due to the poor quality of the crank balance at that time. The technology of today, expecially Honda don't require the "dampener". The Evolution pulley is well balanced and designed to work without the "dampener"


Modified by exospeedAMcrx at 12:53 PM 4/1/2005

 

Here is SFI's website.

http://www.sfifoundation.com/

Basically the test for a 18.1 SFI (harmonic pullies) is they spin it at 12500 RPM for an hour and make sure it doesn't come apart or lose its characteristics or dimensional information.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by exospeedAMcrx &raquo;</TD></TR><TR><TD CLASS="quote">we carry the Evolution pulley and I used to hang out at Evolution while they were developing many of the products they have now.
The SFI is just a certification that they have tested the part to meet certain standards. SFI was started to have a Foundation that everyone can follow.
Im not sure on the actual requirements, but lets say like the Pulley, it would have to be spun at a certain RPM, maybe 12-13K RPM and tested for quality.

From what the Engineers told me at Evolution, dampener is usually associated with the old style pulleys from domestic cars. they needed dampeners due to the poor quality of the crank balance at that time. The technology of today, expecially Honda don't require the "dampener". The Evolution pulley is well balanced and designed to work without the "dampener"


Modified by exospeedAMcrx at 12:53 PM 4/1/2005</TD></TR></TABLE>

Thats what I've heard in the past. Espeically if the whole rotating assembily is ballanced, honda's don't seem to have harmonic problems.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Rtype16 &raquo;</TD></TR><TR><TD CLASS="quote">Here is SFI's website.

http://www.sfifoundation.com/

Basically the test for a 18.1 SFI (harmonic pullies) is they spin it at 12500 RPM for an hour and make sure it doesn't come apart or lose its characteristics or dimensional information.</TD></TR></TABLE>

Sweet...thanks for the confirmation!

I wonder if the flywheels do the same test.