Midi-buggy

[bdkw1]

Hi everybody! Started working on a new project a while ago and thought I would share it's progress with you.

Design: What started all this was working on a Sand Bullet car, it was all sorts of fun to drive but needed a few changes to better suit what I would want to do with the car. This is going to be a larger car mainly for pre-running in Baja.

Chain drive: In order to get the proper gear ratio you have to have a very large sproket or run a jack shaft. Both have serious draw backs.

Motor: Busas make great power but I was a little concernd about tranny strengh and durability. Also no reverse sucks.

So know we need a motor with reverse and shaft drive with a pretty beefy tranny...................... Honda Goldwing............ This will be mated to a Speedway enginerring mini stock quickchange rear end flanged out for 930 CV's.http://www.1speedway.com/irs_quickchange.htm

these are some pictures of the frame drawings. These were just done quickly in 2D to help with part location and geometry.

I have most of the parts completed for this and will take more pics as it progresses. This probibly won't be as well documented as some but I'll try.

[hero_saku39]

My first build is with a goldwing motor.......do you know a price on that diff?
It looks perfect.

[bdkw1]

With flanges and everything about 1250. I picked up a used 1 for about half that.

[hero_saku39]

Do you have any info on a dealer (or can you buy direct from the manufacturer?) I couldn't find any in their list that advertised that diff.

[Reflex]

I heard and read the Goldwing comes with an electric reverse, as in only adequate to back the 350kg bike away from the curb, are you sure it can be considered a real reverse on a buggy?
I know some other peeps scrapped the idea of using that engine because the reverse is not really usable in a buggy, I don't know if this applies to all model years?
Drawings look good, looking forward to seeing your progress.

[hero_saku39]

Originally Posted by Reflex

I heard and read the Goldwing comes with an electric reverse, as in only adequate to back the 350kg bike away from the curb, are you sure it can be considered a real reverse on a buggy?
I know some other peeps scrapped the idea of using that engine because the reverse is not really usable in a buggy, I don't know if this applies to all model years?
Drawings look good, looking forward to seeing your progress.

Newer Goldwings have reverse. 1500 and 1800 motors......I think they use the starter that enguages a reverse gear.?.? Most mini rails aren't going to weigh much more than the 800 lbs. bike. With the lower gearing I think the newer motors with the reverse gear will be sufficient to back it up.

[yoshi]

I'm 99.9 percent sure the goldwing uses the starter for reverse, fine for the single wheel of a bike for about 5 feet, prob. not gonna work for a sandrail. I was using a chrysler gear reduction starter with a 14 inch diameter flywheel on my single seater and even that was a bit high geared for my taste. Good luck though....

[hero_saku39]

Originally Posted by yoshi

I'm 99.9 percent sure the goldwing uses the starter for reverse, fine for the single wheel of a bike for about 5 feet, prob. not gonna work for a sandrail. I was using a chrysler gear reduction starter with a 14 inch diameter flywheel on my single seater and even that was a bit high geared for my taste. Good luck though....

Can you elaborate.....I don't see the problem. The only difference the two rear wheels is gonna make over one rear wheel is rotating mass and I don't see how that will be much of a problem because it will not be a fast acceleration of that weight. Also there will probably be a final drive ratio reduction of 20-30% making it even easier to move the weight. The only problem I see is that it will probably take 12 minutes to back up 6 feet because it will turn so slow.?

[yoshi]

Originally Posted by hero_saku39

Can you elaborate.....I don't see the problem. The only difference the two rear wheels is gonna make over one rear wheel is rotating mass and I don't see how that will be much of a problem because it will not be a fast acceleration of that weight. Also there will probably be a final drive ratio reduction of 20-30% making it even easier to move the weight. The only problem I see is that it will probably take 12 minutes to back up 6 feet because it will turn so slow.?

I will admit that a super low gear ratio will move anything. I am the one that said you could pull a semi trailer with a 5 hp briggs and straton lawn mower with little to no stress if the gearing is right, the problem is the speed. I know that going fast is of no concern, but I don't think anyone wants to sit for even a min. while trying to back up 6 feet. It may not seem like that long but mark out 6 feet on the floor and use a full min. to cross the distance and you'll see how long that really is. I think it will be too high geared in stock form and won't move the rail backward anyway, especially on any kind of incline.....

[bdkw1]

GL1800 uses the starter motor for the reverse. Seeing that these beast wiegh 850# to start out with and I'm going to have a 26% lower overall gear ratio than stock, it should move nicely.

Do you have any info on a dealer (or can you buy direct from the manufacturer?) I couldn't find any in their list that advertised that diff.

You can buy directly from them. Any speedway dealer should also be able to order it for you probibly at a better price.


I'm also thinking of keeping the cruise control. :lol: