Does anybody here know of someone who can or does make a quick change rear end? I would really like one for my supermodified project and it seems impossible to get a Skellenger.

Matt

Does anybody here know of someone who can or does make a quick change rear end? I would really like one for my supermodified project and it seems impossible to get a Skellenger.

Matt
There are no manufactures of quick change rears at the moment. Do not know of anyone that plans on making them either. I know I have only one Skellenger left and I will not part with it. Wish there was a supplier for them as they do add a bit of class to the shelf queens.

There are no manufactures of quick change rears at the moment. Do not know of anyone that plans on making them either. I know I have only one Skellenger left and I will not part with it. Wish there was a supplier for them as they do add a bit of class to the shelf queens.

There was one racer? on this forum that I thought was reproducing the Skell rear end
and had a few for sale but the prices, you could buy a Ford 9" rear cheaper.
With the speed of today cars, I think it would be step back.

The problem we have is in order to do the supermodified concept the right way, meaning engine offset, the only options we have are either a quick change rear end, a 2 belt setup or a reverse rotating engine. Is there any way possible to get a reverse rotating engine?

BTW, obviously we're not going by the QSAC rules for this car. It will violate left side weight % rules, the wheelbase rule, and the shock rules. The project is meant to be more "scale" and like a real ISMA/MSA supermodified, not like a sprint car with different body work the way the QSAC rules are written.

The least expensive way for a quick change these days is to watch ebay for a Raco rearend. big and boxy looking but thats the only option I see.

Try QuarterScaleLegends.com got to their forum. You should have better results there on a Q/C rearend.The problem we have is in order to do the supermodified concept the right way, meaning engine offset, the only options we have are either a quick change rear end, a 2 belt setup or a reverse rotating engine. Is there any way possible to get a reverse rotating engine?

BTW, obviously we're not going by the QSAC rules for this car. It will violate left side weight % rules, the wheelbase rule, and the shock rules. The project is meant to be more "scale" and like a real ISMA/MSA supermodified, not like a sprint car with different body work the way the QSAC rules are written.

One is very close and it will be almost as nice as a skellenger

http://www.quarterscalelegends.com/bb/viewtopic.php?t=1280

One is very close and it will be almost as nice as a skellenger

http://www.quarterscalelegends.com/bb/viewtopic.php?t=1280


What rapid prototype technology did you use to make the parts that are in those pictures? Is that from Z Corp? Or another type of rapid prototype part?

We use Z Corp for some 3D printing similar to the parts you have in the pictures.

The parts look great.

Joe
:thumbsup:

Wow, that looks great. I'll be keeping my eye on that project for sure.

Matt

Thats not rapid prototyping. It is an investment cast part, just like the skellenger rear ends were. The mold is machined aluminum and then you inject wax in the mold. You pull out the wax part and dip it in ceramic over and over again. You then heat it up and the wax melts out. you then pour aluminum in and there you go! The pictures in that post are finished castings from the foundry. They just need to be machined now.

Thats not rapid prototyping. It is an investment cast part, just like the skellenger rear ends were. The mold is machined aluminum and then you inject wax in the mold. You pull out the wax part and dip it in ceramic over and over again. You then heat it up and the wax melts out. you then pour aluminum in and there you go! The pictures in that post are finished castings from the foundry. They just need to be machined now.

Interesting.

They look nothing like the investment castings we use. I work for Woodward Governor Company. We get investment castings from Howmet Georgetown in Canada; they have a much more gray color to them and a bit of gloss/luster to the finish prior to machining. Maybe it's a difference in the grade of aluminum?

Either way, the parts look like they will be nice when finished.

Best of luck with the completion of the project.

Joe
:thumbsup:

heres a sprint car on ebay maybe you might want it with the rear end?
http://cgi.ebay.com/1-4-scale-sprint-cars-and-misc-parts_W0QQitemZ280225636200QQihZ018QQcategoryZ1916 7QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Did this project ever pan out? I am currently in the process of this same idea. I was wondering if you had any help for me?

In post #4, you asked about a reverse rotating engine. I remember a conversation with Carroll Cheek (the founder of WCM) about this. Yes it's possible....I hope a good engine guy will jump on this thread to tell you how to do it. It seems to me it was something about the relationship between the coil and the flywheel. Carroll said "The engine just don't care which way it turns."

Larry

In post #4, you asked about a reverse rotating engine. I remember a conversation with Carroll Cheek (the founder of WCM) about this. Yes it's possible....I hope a good engine guy will jump on this thread to tell you how to do it. It seems to me it was something about the relationship between the coil and the flywheel. Carroll said "The engine just don't care which way it turns."

Larry

I don't know if it applies to this engine or not. I am thinking it does. I am a designer/draftsman for Kohler engines. On our engines, the piston pin is offset. The piston has to be oriented a certain way based on the connecting rod location past TDC(top dead center). This is usually the reason for the marking on top of the piston identifying which way to install the piston. The wrist pin bore is off center in the piston to offset the load on the piston skirt during the compression stroke. Since every stroke on a 2 stroke is the compression stroke, I would think this still applies. What happens if the piston is not oriented correctly for the compression stroke? You will start experiencing piston scuff. This is premature wear on the piston skirt because the compressive load is off center. The reason it is off center is the connecting rod is on an angle on the downward stroke. It is not straight up and down.
Having said that...then I would think if you rotate the engine backwards, then the angle of the connecting rod is going to be slanted on the opposite side of TDC on the downward stroke. If in fact the wrist pin bore is off center(which I am not certain that it is), you would have to flip the piston 180 degrees. If you rotate the piston, do you have to rotate the cylinder as well. I think that if the dowel pin locating the compression ring doesn't align with a port, it shouldn't matter. But this might be confusing for someone else if they are working on your engine.
Again...I am not saying for certain that this is the case with the Zenoah engine. But I would recommend checking the wrist pin bore location and confirm if it is on center or not.
Other comments are welcome....:)

In post #4, you asked about a reverse rotating engine. I remember a conversation with Carroll Cheek (the founder of WCM) about this. Yes it's possible....I hope a good engine guy will jump on this thread to tell you how to do it. It seems to me it was something about the relationship between the coil and the flywheel. Carroll said "The engine just don't care which way it turns."

Larry

Ok...I have been dwelling on this as well. "the relationship between the coil and the flywheel."
The ignition timing will be different. I don't know what the exact timing is for these engines are but I will use a hypothetical number. Let's say that the spark timing is set at 10 degrees before TDC. Then if the engine is rotating backwards, the timing will now be 10 degrees after TDC. There is also the issue with that the engine is now starting its spark timing on the opposite of the magnetic field as well. This will also change the spark timing as well. The engine may still actually run, but performance would be seriously compromised
Let me know your thoughts :)

Take the easy way, turn the motor 180 degrees and make the right side the drive side..

:thumbsup:

"Take the easy way, turn the motor 180 degrees and make the right side the drive side"

Must agree with cadguy's thumbs up!
That's what I have done with my sprintcar. Then you can run Smartech or FG pinion and crown gears to a lay shaft, that drives a pulley to another pulley on the rear axle. My belt is much wider than the standard belts run in the USA, at approx 20mm wide. This system allows the belt to run down the centre line of the chassis. Extremely effective on dirt when the left and right rear wheels load and unload on our rough dirt tracks.
There are photos of my sprinter on this Forum showing what I have done.
Do a search to find the thread.