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Author Topic:   Spear bar on right rear ??
44racer
Dirt Full Roller

Total posts: 36
posted January 10, 2004 07:55 PM  
Has any one ever tried using a spear bar on the right rear ?? Was wondering how this would react compared to using the 4-bar set up.

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44 Racer

zeroracing
Dirt Forum Champ
Total posts: 1876
posted January 20, 2004 09:12 AM  
i looked into and it would take most the rearsteer out of the car, but i was talking with an afco guy and we fiqured the thrust angle would be very verysmall so that means it will not have very much bite.
but maybe we were mistaken on it i ahve not worked with one.
are you refuring to a y shaped tube that uses a birdcage (floats the rearend) and then mounts to the frame infront about in line with the center line of the axle.

NJantz
Dirt Forum Champ
Total posts: 755
posted January 20, 2004 09:36 AM  
got any pics of a spear bar?

zeroracing
Dirt Forum Champ
Total posts: 1876
posted January 20, 2004 10:54 AM  
i think poske sells them for masterbuilt, they look just like a wishbone set up.

44racer
Dirt Full Roller

Total posts: 36
posted January 20, 2004 12:30 PM  
Yes it lookes like a wishbone.Was just courious to see if anyone had tried it and how it worked. Thanks Mike

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44 Racer

GO 24
Dirt Freak

Total posts: 366
posted January 22, 2004 11:20 AM  
Hey guys I ran one all last year. Mine was a kinda "hybrid" Howe that came from Dave Eckrich. It was exactly like you described on the right rear, I also used a shorter spear on the left rear. I ran the car on a VERY tight low-banked 3/8", It was alittle pushy on a tacky track and got really good when the track slicked off. The cure for lack of bite was a short/straight bar instead of a J bar and no 90/10 shock. All in all I was happy with the car, I personally never drove it on a bigger track but the previous owner did and won 12 out of 21 races on 00'.
If you do it it will act and respond like a swing-arm, I wish I would have changed this one over to 4 link left.

GO 24
Dirt Freak

Total posts: 366
posted January 22, 2004 11:22 AM  
I forgot to mention, Mastersbuilt & Dirt Works (mods)have both messed around with spear rods on the RR recently.

dirtracer14
Dirt Forum Champ
Total posts: 1261
posted January 23, 2004 09:33 PM  
I have what you are calling the spear...or wishbone long like 30" bars that mount at the same point. I had the rr spring clampped and didnt like it at all so we are adding another birdcage next to the wishbone to hold the spring and shock.

WPP
Dirt Freak

Total posts: 451
posted January 24, 2004 05:15 AM  
I am also building a wishbone i was told to run the rear spring behind on the birdcage or on top of the rearend this is on the right rear with the wishbone 20 3/4 long and on the lr 4-bar with spring behind with the lower bar 13.5 and the upper 15.5 this is on a modified

GO 24
Dirt Freak

Total posts: 366
posted January 25, 2004 12:53 PM  
That sounds about right WPP, we also ran the coilover behind but on a floating birdcage. I tried it in front of the rear but it took a heavier spring & it was limiting the body roll. I'll definately mess with it again but like I mentioned it'll have a 4 link on the left.

44racer
Dirt Full Roller

Total posts: 36
posted January 27, 2004 09:25 PM  
Thanks for all the input guys.Was just wondering if this would work or not. We are racing and old LARRY SHAW car.It is believed to be a 91 or 92. Called them and didnt have any luck in any setup tips or sugestions. Just thought that we would try something different to see how the car would react. Thanks again Mike

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44 Racer

WPP
Dirt Freak

Total posts: 451
posted January 28, 2004 03:51 AM  
GO24 What angle did you have in the wishboe was the bottom bar level from the birdcage or did it run uphill on the right rear i was told not to run much angle in it if the spring was in the front on the birdcage and if it was in the rear you could run a little bit more angle in it but like i posted earlier i am looking mounting the spring on top of the rear end i would like to here your thoughts thanks

GO 24
Dirt Freak

Total posts: 366
posted January 28, 2004 11:17 AM  
I had 2 spuds on the rr frame, one made the bar darn near level and the other would put the bar right at 10 degrees going up hill. At 10 degrees it had more roll steer and I really never moved it after trying both. I had the coilovers in both locations and could not tell the difference when I moved the bar either. After reaching this point where I was fairly happy all we real really adjusted was stagger, bite, and the straight/panhard bar.

44racer
Dirt Full Roller

Total posts: 36
posted January 29, 2004 12:42 PM  
GO24 When you changed the straight bar did you find a happy medium where you usually started atfor a fairly heavy track then was there much you did to change to a dry-slick track. With that set-up were did you start at with spring rates. Thanks Mike

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44 Racer

[This message has been edited by 44racer (edited January 29, 2004).]

GO 24
Dirt Freak

Total posts: 366
posted January 29, 2004 02:41 PM  
We very seldom changed springs and settled with a 250lr & 200rr, incidently our rf was pretty soft---depending on conditions it was either a 400 or 450.
When the track was heavy I had the straight bar just about level--one hole up from center on the pinion mount, I tried alittle angle but it would get a throttle push in the center (when the cars real hooked up the lf will just kinda skim the top of the track surface). For a slick track I dropped it down to the bottom hole on pinion and went about 7in up off the frame rail. After changing the bar I usually added 30-40lbs of bite to the lr---ended up somewhere around 190lbs.
As a side note of caution, don't use a straight bar in this fashion on a car with alot of roll steer----unless you want a real radical ride!!!

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