• 4 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     TE = 4st Enduro & TC = 4st Cross

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

Volumetric Efficiency

ascribner

ascribner

Husqvarna
AA Class
Off chance, has anyone determined the efficiency of the SMR511 engine? I am trying to calculate CFM to help choose an adequate air filter.
 
An easy starting point is to work backwards from a dyno plot. On most decent modern engines, you'll hit 90%-110% VE at the same time as the torque peak. You can look at the torque curve and ratio it from there, if you want to see what the VE values are at different engine speeds.

If you are just looking to calculate peak CFM, you can assume that you make 10 hp per lb/min of airflow. 50 hp is 5 lb/min, so just figure out how many CFM that is using air density at your location. That ought to be close enough, probably within 10-20%.
 
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