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Author Topic:   RE: Rayburn Starting Point HELLLLP
kgofsttrnlft
Dirt Roller

Total posts: 16
posted August 14, 2005 11:00 AM  
Can anyone give me some starting points for a 2003 Rayburn? It's 4-bar left and Z-link right, underslung. I'm running an all cast iron engine..yeah, I know, but dang, I can't afford all that cool stuff. I need some spring suggestions. I have the pull bar and 5th shock on top of the rear and a lift bar with the sixth coil for braking only, I guess. I have adjustable Koni's on all four corners. I have my own ideas on shock selection, but am willing to listen to more experience. I have recently taken a struggling 4-bar Z modified to some success by making substantial changes in the setup on it, so I have a good working knowledge of rear suspension, and I raced a limited late with monoleaf very successfully until a couple of weeks ago, so I work well with Rayburn's front suspension. All this so you guys will know I'm not totally lost, I just bought this car and everything I read seems to start with an aluminum engine. ANY help will be responded to with respect if not outright bowing and s****ing. Thanks guys!!
Ken Kelley

kgofsttrnlft
Dirt Roller

Total posts: 16
posted August 14, 2005 11:04 AM  
Sorry for the omission, I also need to know what offsets to start with for 14" wide rims..I have to keep front tire width to 88" total and 86 total on rear. Thanks again in advance for ANY and ALL advice!!!!!

rocket36
Dirt Freak

Total posts: 209
posted August 14, 2005 12:17 PM  
i'm not too familiar with rayburn's, but i would think you will need to raise your engine about an inch. we do with our steel block in our rocket. otherwise the weight being so low in the car causes a push.
most chassis builders base thier cars around the standard 5" offset wheels.
the rayburn web site has some base setups to get you started.

kgofsttrnlft
Dirt Roller

Total posts: 16
posted August 15, 2005 09:02 AM  
I think you're right on the wheel offsets. Thank you for the info. I looked at one a friend has yesterday and that seems to be what he has, but he's new to late models too and I was scared to take his word for it. The Rayburn site has starting spec's but I assumed they were for an aluminum engine..should the spring rates be higher for cast iron block and heads?

rocket36
Dirt Freak

Total posts: 209
posted August 15, 2005 02:10 PM  
to start with, i would say start with the base spring rates. you will most likely not be able to go quite as low a rate on the right front as is possible/warranted sometimes with an aluminum engine, but that is something you'll just have to try.
maybe worth calling rayburn and talking to one of thier guys, might save a heap of "he-said-she-said" type problems.

kgofsttrnlft
Dirt Roller

Total posts: 16
posted August 15, 2005 03:20 PM  
Thanks again. Yeah, I'll give him a call and see what he says.

karsbell
Dirt Roller

Total posts: 23
posted September 13, 2005 05:56 AM  
I am wanting to set my underslung 2001 rayburn up with four bar on left, but I have a question. On a regular four bar car there is a dummy shock in front of the axle which mount on the birdcage. I can't mount the dummy shock on the birdcage becauase the car is underslung. So does the dummy shock mount on its own birdcage with a heim rod so it floats but stays in place or does it mount on a bolt to the axle tube mount so it is stationary? Any help will be appreciated.
Scott

rocket36
Dirt Freak

Total posts: 209
posted September 13, 2005 03:36 PM  
the dummy shock is normally just mounted on the front of the birdcage where a regular shock would mount at the frame and birdcage.
the zero valve shock (with a 2" extension) is only used to limit downward travel (upward lift) to stop the rear shock from pulling apart and over indexing of birdcage. your underslung rails should do the same thing.
some cars will use a valved shock on the front side like a 9comp/1ext to help hold the car on the bars and stop it from slamming down hard under brakes.
if you have the front mounts on birdcage and frame, you should be able to run one, i can't see why the underslung rail would be in the way.

fr1
Dirt Forum Racer

Total posts: 93
posted September 15, 2005 11:00 AM  
Good luck calling CJ and telling him you are running 4 link!

GO 24
Dirt Freak

Total posts: 366
posted September 15, 2005 11:32 AM  
On the 00' I help out with from time to time it's all basically standard Rayburn setup and then tweaked from there for the driver. Good rule of thumb for steel motors is to raise the engine 1in as stated before.
CJ's hard to read, he's sent me to the hotdog stand more than once!

karsbell
Dirt Roller

Total posts: 23
posted September 15, 2005 08:55 PM  
We are tired of eating hotdogs, that's why we wnat to try the 4 bar setup.

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