Project Bottomless Money II Chassis Plans

 

 

 
 

 

Steve's Big Block Powered Chassis

D60 FR/RR, C6, 203-205 Doubler

 

I received quite a few requests for chassis blueprints that could accommodate a larger drive train.  You asked for it so here it is.

 First, all the components I used in my Project BMP will easily fit into this chassis, however I decided to design this chassis around full width axles (84" outside of tire to outside of tire shown).  To accommodate larger drive trains the new chassis features a taller & wider hood and a wider passenger compartment.  The lower frame rails were also re-designed to allow for a lot of foot room.  Here's some comparison shots of the new 2 seater chassis (BMP II) vs. the original 3 seater I recently built.  The front axle is pushed farther forward in the 2 seater chassis to accommodate the track bar up front and to keep the front axle in front of the motor.  With all the links being 34" long the new chassis would have an estimated wheelbase of 108.5" and better than a 90 degree approach angle front and rear with 39.5" tires.  Longer rear links would easily allow for bigger tires and a longer wheelbase if desired.

The part envelope shown in green is an inline 6 cylinder engine, 5 speed transmission and Dana 300 transfer case from a Jeep YJ (one of the larger engine options out there).  A raised hood or hood bulge would be required and the stock radiator would need to be rear mounted (or a smaller one sourced). A custom 26 x 19" double pass radiator would fit up front. In addition, the belly pan of the chassis is left wide open to allow the transfer case and transmission to be removed from the vehicle without pulling the engine. Other engines that would fit easily: Pontiac 3.8l V6, Chevy 4.3l V6, Chevy 4.8/5.3/5.7/6.0/LT1, Ford 5.0l to name a few.  

The front axle could be located with either a 4 or 5 links (one of them being a trac bar), the rear easily fits a double triangulated 4 link.  There is room for a rear sway bar on the rear axle if you desire one,  the one shown is approx. 36" long.

Isometric views comparing the BMP II chassis to the original BMP chassis.  In back of the BMP II chassis I mocked up a stock YJ radiator and a 20 gallon fuel cell (approximate).  Basically BMP II is a compact 2 seater with lots of room.

Here are a few views without the body panels.  The drive train shown is my existing 1.6l with a Samurai Radiator, dual Toyota transfer cases, a 5 speed manual transmission and an 8 gallon fuel cell.  As you can see the engine bay is very roomy and should provide ample room for larger motors.

Specs:  Outside of door bar to outside of door bar is 55.6".  Belly to highest point on the roof is 55" and length from front bumper to rear most tube is 133.6". Estimated chassis weight is approx. 300lbs as shown.

Suspension Information: For further suspension information see the FAQ.

Comparison pictures, BMP II in front

The plans you will receive are laser printed on 11 x 17 sized sheets of paper.  I have broken down the entire chassis into stages and include a suggested order of assembly guide to help you build your chassis.  The guide lists how I would tackle the chassis build and notes when you should mock up major systems and suggests other systems that need to be considered at that stage.

Things to keep in mind:

1. I make no warranties of any kind for the performance or durability of this chassis.  You are buying plans only. If you chose to fabricate something using these plans you assume all risk in the fabrication and operation of the project.

2.  You will need a basic knowledge of tube bending and access to a tube bender, welder, chop saw, etc. Access to a plasma cutter or cutting torch would be very helpful but is not required.  The chassis is designed around 1 5/8 tubing with a bend radius of 4.5"***.  Larger tubing  or bend radii could be used with some adjustments to the initial tube lengths.  there are no bends over 90 degrees.

*** It has been brought to my attention that the 4.5" radius die is no longer available from JD2. See the FAQ here for information on compensating for different die sizes. It is actually a very quick and easy adjustment to accommodate larger bend radius dies.

3.  The plans are meant to be a guide.  Since there is no way to get the bends to match the plans %100 expect to have to make small adjustments.  The plans do have suggested cut lengths and start points for the bends.  It will be your responsibility to cope the tube ends.  In spots where there are straight braces I usually provide a recommended tube size and length, however in most cases your best bet is to measure the distance between the nodes to determine the actual cut length.

4.  The plans only cover the dimensions of the basic chassis.  This means gussets, mounting tabs, suspension related mounts on the axles, body panels, component mounts, and all interior mounting tubing, etc are your responsibility. 

5.  I will include a recommended list of material for the basic chassis.  You may want to purchase additional material if you would like to leave extra material on the cuts or if you feel you may have to re-do a section of tubing.

For costing purposes I used approximately (8) 20ft sticks of 1.625 x .120 DOM, and (2) 20ft sticks of the following: 1.50 x .095 and 1.50 x .120 for the main chassis bracing. To save money you can get away with using HREW for any piece of tubing that does not contact rocks.

The plans cost $120 which includes all drawings on 11 x 17 paper; shipping is included in that price to any address in the Continental US.  I do not offer electronic versions. I accept Zelle as payment, email sales@azrockcrawler.com for payment  information. I used to accept PayPal but as of 12/9/2020 I am no longer accepting payment from that "service".

All packages ship USPS, please allow 1-2 weeks for domestic orders although actual ship times are usually much faster.

International customers please read -

As of 10-30-2020 I will only ship to the US. I apologize for the inconvenience but I no longer have any faith in the postal services of other countries.

  Answers to the most common questions -

I do not offer an electronic version of the plans.

I do not accept PayPal for any orders as of 12-9-2020.

 
         
 

This work in progress is being built here in Phoenix, AZ by Bill Guier. He had a local shop fabricate the chassis from the plans.

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The chassis was modified for more passenger room.

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The buggy will be powered by a 472 cu/in Cadillac motor which will feed a TH400 and D300 combo.

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A pair of Rockwell axles shod with 44" Boggers will eventually make their home under this rig.

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