Rorty Locost IRS Assembly - locost7.infolocost7.info/files/suspension/RortyLocostIRSAssembly.pdf · Rorty Locost IRS Assembly This Independent Rear Suspension design breaks no new

Rorty Locost IRS Assembly This Independent Rear Suspension design breaks no new ground, but is devised specifically for the Lotus Seven style "Locost" sports car as detailed in Ron Champion's book "Build Tour Own Sports Car For As Little As £250 – And Race It!" The hub bearing units, brake discs and callipers etc. are all sourced from a UK Ford Sierra, but many other IRS donors may be suitable, normally only requiring the hub plate and caliper bracket PCD to be altered. The adjustable links in the lower wishbones get around the problem of exerting undesirable loads on the rod ends and wishbones when the uprights are adjusted away from being parallel to the car's centre line. Due to their global availability, the design was based around QA1 shocks (part number UR3855B – or UR3855BX for polished), and 7" springs, though a number of other brands of shocks can be substituted. The clevises and weld eyes for the adjustable links are not as widely distributed, so I included drawings for them in the design. No warranty is given or implied as to the design's suitability for any purpose. It is as yet unproven in a Locost, but is freely offered for educational and comparative purposes. Anyone building and driving a car based on this design does so entirely at their own risk. Due to their propensity to sue anything with a pulse, Americans are explicitly requested not to attempt to construct this assembly either in part or in whole. I absolve myself from any liability whatsoever. Bob Frost-Stevenson [email protected] www.rorty-design.com

RORTY LOCOST IRS FASTENERS LIST

QTY ITEM MATERIAL (FINISH)

DIA/SIZE CLASS/GRADE LENGTH

12 HEX BOLT STEEL (ZINC) M12 CLASS 10.9 65mm 4 HEX BOLT STEEL (ZINC) M10 CLASS 10.9 30mm 2 HEX BOLT STEEL (ZINC) 1/2” X 20 UNF GRADE 8 1.50”

14 NYLOC NUT STEEL (ZINC) M12 4 NYLOC NUT STEEL (ZINC) 1/2” X 20 UNC 2 NYLOC NUT - THIN STEEL (ZINC) 1/2” X 20 UNF 6 JAM NUT STEEL (ZINC) 1/2” X 20 UNF RH 2 JAM NUT STEEL (ZINC) 1/2” X 20 UNF LH

12 HARDENED FLAT WASHER STEEL (ZINC) Ø12 4 HARDENED FLAT WASHER STEEL (ZINC) Ø10 4 HARDENED FLAT WASHER STEEL (ZINC) Ø1/2”

IRS

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REV

No.

RO

RTY

DES

IGN

P

O BO

X 13270 LAW

CO

UR

TS M

ELBOU

RN

E

VIC

8010 A

US

TRALIA

DATE & N

oZO

NE

UN

LESS SP

ECIFIE

D O

THE

RW

ISE:1. ALL D

IME

NS

ION

S A

RE

IN M

ILLIMETER

S2. R

EM

OVE

ALL B

UR

RS

& S

HA

RP ED

GES

3. CO

RN

ER R

ADII R

0.754. C

HAM

FER

SIZE 0.75 x 45°

5. CO

NC

ENTR

ICITY 0.05 TIR

THIS D

RAW

ING

IS C

ON

FIDE

NTIA

L AND

IS S

UP

PLIED

ON

THE

EXP

RE

SS C

ON

DITIO

N TH

ATIT SH

ALL NO

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N N

OR

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NSE

NT O

F RO

RTY D

ESIGN

FIRST A

NG

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JECTIO

N

UN

LESS SP

ECIFIED

O

THER

WISE

: TOLE

RA

NC

ES A

NG

ULAR

± 0.5°

.X ± 0.5.XX

± 0.25.XX

X ± 0.125

DATE

27.10.05R

F-SLO

CO

ST IR

S

REA

R U

PR

IGH

TH

UB

PLATE

RD

LIRS 23-3

1:1

SH

EET

DR

G N

o

DR

AW

NS

CALE

TITLE

A3

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ww

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REV

ISIO

NS

REV

No.

RO

RTY

DES

IGN

P

O BO

X 13270 LAW

CO

UR

TS M

ELBOU

RN

E

VIC

8010 A

US

TRALIA

DATE & N

oZO

NE

UN

LESS SP

ECIFIE

D O

THE

RW

ISE:1. ALL D

IME

NS

ION

S A

RE

IN M

ILLIMETER

S2. R

EM

OVE

ALL B

UR

RS

& S

HA

RP ED

GES

3. CO

RN

ER R

ADII R

0.754. C

HAM

FER

SIZE 0.75 x 45°

5. CO

NC

ENTR

ICITY 0.05 TIR

THIS D

RAW

ING

IS C

ON

FIDE

NTIA

L AND

IS S

UP

PLIED

ON

THE

EXP

RE

SS C

ON

DITIO

N TH

ATIT SH

ALL NO

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, CO

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RTY D

ESIGN

FIRST A

NG

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JECTIO

N

UN

LESS SP

ECIFIED

O

THER

WISE

: TOLE

RA

NC

ES A

NG

ULAR

± 0.5°

.X ± 0.5.XX

± 0.25.XX

X ± 0.125

DATE

27.10.05R

F-SLO

CO

ST IR

S

REA

R U

PR

IGH

TW

ISHBO

NE B

RAC

KET

RD

LIRS 23-4

1:1

REA

R U

PR

IGH

TP

LATE

A

RD

LIRS 23-5

2:1

2:1

RD

LIRS 23-6

REA

R U

PR

IGH

TP

LATE

B

2:1

RD

LIRS 23-7

REA

R U

PR

IGH

TP

LATE

C

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PR

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TP

LATE

S D &

E

RD

LIRS 23-8

2:1

1:1

RD

LIRS 23-3

REA

R U

PR

IGH

TH

UB

PLATE

SH

EET

DR

G N

o

DR

AW

NS

CALE

TITLE

A3

[email protected]

ww

w.rorty-design.com

REV

ISIO

NS

REV

No.

RO

RTY

DES

IGN

P

O BO

X 13270 LAW

CO

UR

TS M

ELBOU

RN

E

VIC

8010 A

US

TRALIA

DATE & N

oZO

NE

UN

LESS SP

ECIFIE

D O

THE

RW

ISE:1. ALL D

IME

NS

ION

S A

RE

IN M

ILLIMETER

S2. R

EM

OVE

ALL B

UR

RS

& S

HA

RP ED

GES

3. CO

RN

ER R

ADII R

0.754. C

HAM

FER

SIZE 0.75 x 45°

5. CO

NC

ENTR

ICITY 0.05 TIR

THIS D

RAW

ING

IS C

ON

FIDE

NTIA

L AND

IS S

UP

PLIED

ON

THE

EXP

RE

SS C

ON

DITIO

N TH

ATIT SH

ALL NO

T BE LO

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, CO

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RSO

N N

OR

USED

FOR

AN

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SE W

ITHO

UT TH

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CO

NSE

NT O

F RO

RTY D

ESIGN

FIRST A

NG

LE P

RO

JECTIO

N

UN

LESS SP

ECIFIED

O

THER

WISE

: TOLE

RA

NC

ES A

NG

ULAR

± 0.5°

.X ± 0.5.XX

± 0.25.XX

X ± 0.125

DATE

27.10.05R

F-SLO

CO

ST IR

S

1:1RD

LIRS 23-10

REA

R U

PR

IGH

TP

LATE

S H J &

K

SH

EET

DR

G N

o

DR

AW

NS

CALE

TITLE

A3

[email protected]

ww

w.rorty-design.com

REV

ISIO

NS

REV

No.

RO

RTY

DES

IGN

P

O BO

X 13270 LAW

CO

UR

TS M

ELBOU

RN

E

VIC

8010 A

US

TRALIA

DATE & N

oZO

NE

UN

LESS SP

ECIFIE

D O

THE

RW

ISE:1. ALL D

IME

NS

ION

S A

RE

IN M

ILLIMETER

S2. R

EM

OVE

ALL B

UR

RS

& S

HA

RP ED

GES

3. CO

RN

ER R

ADII R

0.754. C

HAM

FER

SIZE 0.75 x 45°

5. CO

NC

ENTR

ICITY 0.05 TIR

THIS D

RAW

ING

IS C

ON

FIDE

NTIA

L AND

IS S

UP

PLIED

ON

THE

EXP

RE

SS C

ON

DITIO

N TH

ATIT SH

ALL NO

T BE LO

AN

ED

, CO

PIE

D O

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N N

OR

USED

FOR

AN

Y O

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RPO

SE W

ITHO

UT TH

E W

RITTEN

CO

NSE

NT O

F RO

RTY D

ESIGN

FIRST A

NG

LE P

RO

JECTIO

N

UN

LESS SP

ECIFIED

O

THER

WISE

: TOLE

RA

NC

ES A

NG

ULAR

± 0.5°

.X ± 0.5.XX

± 0.25.XX

X ± 0.125

DATE

27.10.05R

F-SLO

CO

ST IR

S

2:1

REA

R U

PR

IGH

T -C

ALLIPER

BRAC

KET

RD

LIRS 23-11

SH

EET

DR

G N

o

DR

AW

NS

CALE

TITLE

A3

[email protected]

ww

w.rorty-design.com

REV

ISIO

NS

REV

No.

RO

RTY

DES

IGN

P

O BO

X 13270 LAW

CO

UR

TS M

ELBOU

RN

E

VIC

8010 A

US

TRALIA

DATE & N

oZO

NE

UN

LESS SP

ECIFIE

D O

THE

RW

ISE:1. ALL D

IME

NS

ION

S A

RE

IN M

ILLIMETER

S2. R

EM

OVE

ALL B

UR

RS

& S

HA

RP ED

GES

3. CO

RN

ER R

ADII R

0.754. C

HAM

FER

SIZE 0.75 x 45°

5. CO

NC

ENTR

ICITY 0.05 TIR

THIS D

RAW

ING

IS C

ON

FIDE

NTIA

L AND

IS S

UP

PLIED

ON

THE

EXP

RE

SS C

ON

DITIO

N TH

ATIT SH

ALL NO

T BE LO

AN

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, CO

PIE

D O

R D

ISC

LOS

ED TO

ANY O

THE

R PE

RSO

N N

OR

USED

FOR

AN

Y O

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PU

RPO

SE W

ITHO

UT TH

E W

RITTEN

CO

NSE

NT O

F RO

RTY D

ESIGN

FIRST A

NG

LE P

RO

JECTIO

N

UN

LESS SP

ECIFIED

O

THER

WISE

: TOLE

RA

NC

ES A

NG

ULAR

± 0.5°

.X ± 0.5.XX

± 0.25.XX

X ± 0.125

DATE

27.10.05R

F-SLO

CO

ST IR

S

SH

OC

K MO

UN

T -LO

WER

RD

LIRS 24

1:1

SH

EET

DR

G N

o

DR

AW

NS

CALE

TITLE

A3

[email protected]

ww

w.rorty-design.com

REV

ISIO

NS

REV

No.

RO

RTY

DES

IGN

P

O BO

X 13270 LAW

CO

UR

TS M

ELBOU

RN

E

VIC

8010 A

US

TRALIA

DATE & N

oZO

NE

UN

LESS SP

ECIFIE

D O

THE

RW

ISE:1. ALL D

IME

NS

ION

S A

RE

IN M

ILLIMETER

S2. R

EM

OVE

ALL B

UR

RS

& S

HA

RP ED

GES

3. CO

RN

ER R

ADII R

0.754. C

HAM

FER

SIZE 0.75 x 45°

5. CO

NC

ENTR

ICITY 0.05 TIR

THIS D

RAW

ING

IS C

ON

FIDE

NTIA

L AND

IS S

UP

PLIED

ON

THE

EXP

RE

SS C

ON

DITIO

N TH

ATIT SH

ALL NO

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CO

NSE

NT O

F RO

RTY D

ESIGN

FIRST A

NG

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RO

JECTIO

N

UN

LESS SP

ECIFIED

O

THER

WISE

: TOLE

RA

NC

ES A

NG

ULAR

± 0.5°

.X ± 0.5.XX

± 0.25.XX

X ± 0.125

DATE

27.10.05R

F-SLO

CO

ST IR

S

SH

OC

K MO

UN

T -LO

WER

RD

LIRS 24

1:1

SH

EET

DR

G N

o

DR

AW

NS

CALE

TITLE

A3

[email protected]

ww

w.rorty-design.com

REV

ISIO

NS

REV

No.

RO

RTY

DES

IGN

P

O BO

X 13270 LAW

CO

UR

TS M

ELBOU

RN

E

VIC

8010 A

US

TRALIA

DATE & N

oZO

NE

UN

LESS SP

ECIFIE

D O

THE

RW

ISE:1. ALL D

IME

NS

ION

S A

RE

IN M

ILLIMETER

S2. R

EM

OVE

ALL B

UR

RS

& S

HA

RP ED

GES

3. CO

RN

ER R

ADII R

0.754. C

HAM

FER

SIZE 0.75 x 45°

5. CO

NC

ENTR

ICITY 0.05 TIR

THIS D

RAW

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IS C

ON

FIDE

NTIA

L AND

IS S

UP

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ON

THE

EXP

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SS C

ON

DITIO

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ATIT SH

ALL NO

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NT O

F RO

RTY D

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FIRST A

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RO

JECTIO

N

UN

LESS SP

ECIFIED

O

THER

WISE

: TOLE

RA

NC

ES A

NG

ULAR

± 0.5°

.X ± 0.5.XX

± 0.25.XX

X ± 0.125

DATE

27.10.05R

F-SLO

CO

ST IR

S

1:1

RD

LIRS 25

SH

OC

K MO

UN

T -U

PPER