Rule of thumb for girder and hydraulic frontend

Try using this area for frontend information.
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krymis
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Rule of thumb for girder and hydraulic frontend

Post by krymis »

Rule of thumb for setting trail of hydraulic and girder frontends:
First use the tire width formula (T=(((rear tire width/front tire width)*100)-100)*0.01) to find the needed adjustment trail.
I.E.: 90/90/21 front tire and 250/35/18 rear tire
T=(((250/90)*100)-100)*0.01
T=(((2.778)*100)-100)*0.01
T=((277.778)-100)0.01
T=(177.778)*0.01
T=1.778" of trail adjustment needed

* remember this equation results in American Standard Measuring not metric so you would have to do one more little conversion for metric: simply multiply answer by 25.4 to get mm answer
* i try to round to three decimal places as that is a common amount when machining.

So now using a baseline trail of 2" I will add the trail adjustment to the 2" baseline and come up with my needed trail.
I.E.: 2" + 1.778"= 3.778" of needed trail or round to nearest 1/8" so 3.75" of trail.

- I do not concentrate on wheel flop for these front ends as they respond better to the trail numbers rather than the wheel flop numbers. Frontends with a rocker system at the axle, I use my wheel flop equation and shoot for .125" of trail as the axle travels in an arc about the fulcrum point.
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Re: Rule of thumb for girder and hydraulic frontend

Post by concrete guy »

Thanks for posting this Chris.
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Re: Rule of thumb for girder and hydraulic frontend

Post by Maxthegardener »

:handgestures-thumbupleft:
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Re: Rule of thumb for girder and hydraulic frontend

Post by budoka »

love seeing this kind of info being spread around. i've had a book on suspension theory and application lying around for some time that i've been wanting to dig into, but just haven't seemed to be able to find the time.

good stuff, thanks for posting it.

-dan
-experience is a wonderful thing. It enables you to recognize a mistake when you make it again.
http://knuckleheadsummer.blogspot.com/
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railroad bob
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Re: Rule of thumb for girder and hydraulic frontend

Post by railroad bob »

Obviously a lot of work put into this, thanks...
Alaska - Land of the Individual and Other Endangered Species
An Armed Society is a Polite Society,...
Politicians Prefer Unarmed Peasants
TANSTAAFL
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