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Locost 442 vs book measurements and cuts

Post by Ryan Chapman

Feb 27 2024

Dimension	Original Locost (Ron Champion)	Locost 442 Mod
Width	~44 in (1118 mm)	~48 in (1219 mm)
Length	~123 in (3124 mm)	~127 in (3226 mm)
Height	~13 in to top of rails	~15 in (2 in taller)
Wheelbase	~88 in (2235 mm)	~92 in (2337 mm)
Track Width	Based on donor car	Same or custom adjusted

Label	Qty	Length (in)	Notes
Base Rails
Bottom Longitudinal Rails (BR)	2	127.0	Full length of chassis (4" longer)
Outer Rails (OR)	2	92.0	Width of car (4" wider)
Cross Members (CM1, CM2, CM3)	3	44.0	Inner floor bracing
Front Bottom Crossmember (FB)	1	44.0	Between front rails
Rear Bottom Crossmember (RB)	1	44.0	Rear of chassis

| Verticals & Uprights | | | |
| Front Uprights (FU) | 2 | 15.0 | Front frame height (2" taller) |
| Rear Uprights (RU) | 2 | 15.0 | Rear corners |
| Scuttle Uprights (SU) | 2 | 15.0 | Near driver/passenger dash area |
| Transmission Tunnel Uprights (TTU) | 4 | 13.0 | Optional; interior support |

| Top Rails | | | |
| Top Longitudinal Rails (TR) | 2 | 127.0 | Matches base rails |
| Top Outer Rails (TOR) | 2 | 92.0 | Same width as OR |
| Front Top Crossmember (FTC) | 1 | 44.0 | Optional for firewall area |
| Rear Top Crossmember (RTC) | 1 | 44.0 | Matches RB |

| Diagonal Braces | | | |
| Side Diagonals (SD) | 2 | ~52.0 | Cut to fit (angled from bottom to top rails) |
| Rear Cross Braces (RCB) | 2 | ~30.0 | For rear triangle bracing |
| Transmission Tunnel Diags | 2 | ~35.0 | Optional, inside tunnel |

| Tunnel Rails (Optional) | | | |
| Tunnel Sides | 2 | ~127.0 | Inner transmission tunnel |
| Tunnel Crossmembers | 4 | ~6–10 | Cut to fit, width varies by trans |

📝 Notes:

This cut list gives you a complete frame tub, ready for the addition of suspension, roll cage, and body supports.
Cut lengths may vary depending on your drivetrain, pedal box, and seat positioning.
Angled cuts are needed for many diagonal pieces—these should be cut to fit on the car during mock-up for best accuracy.
You will need about 90–110 feet of square tube to complete this base frame.

Here’s your cut diagram showing how to efficiently use 20-foot (240") steel tubes for the Locost 442 frame. Each row represents one stick of tubing, with labeled cuts and their lengths.