campo

iTrader: (3)

redesigned some knuckles and i love the out come!!!

joshuaput

schwooo
fds are awesome with like 48degrees of angle. whats this at? I bet thats going to blow minds.

Also those tires are awesome in the rear.

campo

iTrader: (3)

That's about 75-80 degreas

Battle Cat

iTrader: (78)

hows your inner clearance on the LCA?

campo

iTrader: (3)

I fixes the problem where the caliper hits the lca with my knuckles And my wheels hit the frame or they would turn more!!

ballinnmiami240sx

iTrader: (2)

your calipers on?

campo

iTrader: (3)

Lol yes they are on! That picture is fully bolted up and only one inch higher than ride height!

Battle Cat

iTrader: (78)

im still waiting to see if any one makes a LCA that allows for more angle/clearance

driftfcbuckey

iTrader: (8)

Measure it up! Looks good

campo

iTrader: (3)

Well with my knuckles you don't need aftermarket lcas! And if you want more angle you need to modify the knuckles any how so why even bother with them?

ballinnmiami240sx

iTrader: (2)

im planning to make new lca's soon.

boogerburns

Thats some mad angle! What did you do to them to clear the lca?

campo

iTrader: (3)

I fixed the roll center by dropping down the lower balljoint on the knuckle by one inch and shortened the tie rod pickup and turned it in!

mannykiller

iTrader: (93)

I'd really like to see the actual knuckle if you have a pic of them..

SpAm@FC

iTrader: (4)

more pics please!

MadJap

It's really very cool!!!!
More pics please!!!)))

mannykiller

iTrader: (93)

updates? knuckle pics?

campo

iTrader: (3)

soon guys! i have been overly busy down at Pettit Racing rebuilding the 20b!

campo

iTrader: (3)

Well here is my secret!

RogueFab

iTrader: (2)

How do you think the strength compares to stock? It is hard to see the material thickness in the photo with the paint on. Looks like chopped and turned... Did you V groove and fill with weld?

campo

iTrader: (3)

yes its v-grooved! i have an old buz box welder that will melt 5 inch thick steal so i know they wont break. the steal plate i used for the drop and bracing is quarter inch.

mikerbike

Did you get a funky/intense camber curve, since your upper and lower arms are further angled apart than they were before? Or do you not really care about that kind of stuff?

RogueFab

iTrader: (2)

You aren't going to leave that huge spacer/bolt in single shear on the tie rod end... right?

Melt 5 inch thick steel? Not with 220V and house current. And not that you would ever need to. I'll take your word that your welder has enough juice for a multipass on 1" cast steel/iron penetrating .25" at a time though.

campo

iTrader: (3)

the straight line driving has intense neg camber but at full lock the tires have full contact leading wheel and trailing wheel like i wanted.

No im not gonna leave them like that, even though they are all grade 10. it was just a mockup i made but im going to drill out the knuckles and put in copper bushings so there is no taper and then i just replace the copper bushing over time when they wear down.

and it wont melt 5" on a quick pass but its a 50+ year old welder and i can melt these knuckles to a pile of scrap if i wanted. its intense. i can take a video of it when i get back from vacation if you'd like

RogueFab

iTrader: (2)

My concern isn't the hardware, it is the Z distance from the knuckle casting to the point where the heim is mounted. Your stress in that pin is much more significant from bending load than from shear, and your bending load is proportional to the moment arm length (Z/vertical dist). Furthermore, your linear steering force required is inversely proportional to the Y/forward distance from your knuckle pivot axis to the tie rod hole. Without taking measurements, it looks like you cut about 1/3 of steering moment arm off, and tripled the Z distance. With those numbers, you will have more than 450% of the load in that pin that an OEM setup has. If you want to see a free body diagram or more engineering analysis, let me know.

One other drawback will be deflection in that long bolt (or any other long hardware you use). With the long moment arm and high loading, you will see some serious movement at the heim before the tire moves (which will of course be worse with the engine installed and when the car stopped).

You did an amazing job cranking a ton of steering travel out of that setup, and I am only posting this so that I can alert you of what in my opinion is a safety issue. I am glad you are innovating, and I would love to see this thing drifted at steering lock with this setup! Just don't want to see it break and harm anyone

Thanks for considering this. If you want to take some measurements I can measure my OEM stuff and do a more detailed analysis for you. I'm a mechanical engineer with a background from industry that includes FEA and other structural analysis, and my business is designing metalworking tools with Rogue Fabricaion.