Upgrade? The scrub radius is so wrong there. seriously, that is not the right way to build a front end. .
It's pretty, It's not right but it's pretty Lots of cars have shit for scrub radius because of the aftermarket parts we are force fed. So you're not alone. Scrub radius of 2" (positive or negative) is the sweet spot.
Maybe it is my old eyes but it looks like the bottom of the shock mount is just barely above the rim outer edge, thus making it technically within the scrub radius. Cutting it close if there is any crown but we all make our choices. Sorry I was not thinking scrub radius but scrub line.
I have an almost identical looking setup on my roadster, but the inner edge of the wheel rim is just about inline with the outer edge of the large slot in the caliper mount / disc cover, meaning the wheel is inboard by a good inch or more. Mine drives perfectly. I don't know how detrimental an effect that extra scrub radius would have. Can't be a good thing but isn't necessarily dreadful? Chris
Updated the Muncie two years ago. Changed from 3:30 to 3:80 posi. In need of a fifth gear, settled on a Richmond. Won't install it until next winter.
Nah, it sits right...it's been measured out. It drives right. We didn't change the stance...Video with the 3:30
Been aware of scrub radius for quite awhile, but this is the first time I've ever seen 2" pos. or neg. designated as acceptable. Always thought that you were supposed to aim for center, which I can't get on my hiboy because of Buick drums unless I go to 16" tires/rims. Never measured mine but an educated eyeball says about 1-1.5" pos. Might be able to bring in a half inch or so, but didn't think it was really worth the expense and effort. Your comment makes me feel a bit better about that decision.
Ackerman has nothing to do with scrub radius, which is explained and depicted quite well in post #4. You've got a sharp car and I don't want you to get the idea that I'm critizing it in any way, just talking about one of the little known aspects of steering geometry.
"I'm familiar with ackerman type steering and others." It is not a type of steering, it is a principle of steering geometry.
Excuse me, it was sold as a feature by some manufactures, like McCulloch. I don't take any of this as criticism, we don't even have a chrome shop in the whole state. My car is my daily driver and it drives nice.
Ackerman is a principal of steering geometry- specifically tracking thru corners. More specifically the inside tire turning a tighter circle than the outside tire. It's in the same categories as caster camber and toe
So 2" pos/negative is the sweet spot for scrub radius. The scrub creates a force against the steering components. This force loads all of the inherent slop to one side and keeps it there. As scrub radius decreases towards zero that force lessens and the slop can switch sides, incredible at ZERO or close creating loose and wandering steering as that slop switches sides. More than 2" and then the force is to great and causes irrational steering output and tire wear.
He'll probably just buy one of those go-cart Ackermans and adapt it to his 32. Should solve all the driveability issues. Don't worry, it's been "measured out".
This is the strangest thread I've read in a while. It seems like there are about 3 separate conversations going on independent of each other...
No They don't even make the 1:1 5th gear anymore or the 6-speed OD only the Super street 5 with OD and the Super T 10 4-speed. https://www.richmondgear.com/auto-parts-catalog/high-performance-transmission-catalog/
Is Ackerman sold by the gallon or the pound? I think I'd better stock up, there may be a shortage of it in the near future.
The Jalopy Journal
