100/4 Bottom End

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100M PISTONS

Our 100M Die Cast Pistons are made specially for us by Omega,  Britain's leading competition piston manufacturer. They have the original 100M dish of 14CC which will give a compression ratio of approximately 8.5:1, providing the cylinder head and block have not been skimmed.

Being lighter and having a better design than the original they are not only stronger for performance use but are also quieter for road use. We have used metric sizes in order to take advantage of the latest ring technology and reduce crank case pressure.

They are supplied with gudgeon pins to suit standard clamp conrods (gudgeon pins for fully floating rods are available to order).

The sizes stated are the actual bore sizes, all clearances have been allowed for on the piston.

100/4 Bottom End
Code: CENG409
Sku: CENG409
Availability: In Stock
CENG409
£395.00
Qty
Code: CENG410
Sku: CENG410
Availability: In Stock
CENG410
£395.00
Qty
Code: CENG411
Sku: CENG411
Availability: In Stock
CENG411
£395.00
Qty

Replacement Parts

Code: CENG413
Sku: CENG413
Availability: In Stock
CENG413
£31.00
Qty
Code: CENG414
Sku: CENG414
Availability: In Stock
CENG414
£31.00
Qty
Code: CENG415
Sku: CENG415
Availability: In Stock
CENG415
£31.00
Qty
Code: CENG409C
Sku: CENG409C
Availability: In Stock
CENG409C
£19.95
Qty

FLAT TOP PISTONS

Forged by Omega for maximum strength. These give an approximate compression ratio of 10.5:1 the crown is of sufficient thickness to allow a 6CC dish to be machined in if a slightly lower compression ratio is required.

They are supplied as a set of 4 with plain Gudgeon Pins to suit fully floating con rods.

Gudgeon Pins for standard clamp rods are available to order.

100/4 Bottom End
Code: CENG409F
Sku: CENG409F
Availability: In Stock
CENG409F
£495.00
Qty

Replacement Parts

Code: CENG413/3
Sku: CENG413/3
Availability: In Stock
CENG413/3
£9.95
Qty
Code: CENG413/7
Sku: CENG413/7
Availability: In Stock
CENG413/7
£12.52
Qty
Code: CENG413/10
Sku: CENG413/10
Availability: In Stock
CENG413/10
£12.65
Qty
Code: CENG409G
Sku: CENG409G
Availability: In Stock
CENG409G
£16.95
Qty
Code: CENG612C
Sku: CENG612C
Availability: In Stock
CENG612C
£0.53
Qty

CYLINDER LINER

Our good quality cast iron straight plain Cylinder Liners are available in three sizes, all over 8 inches (203mm) long and require shortening after fitting.

Approximate dimensions are:
ENG417B 3.543"od 3.346"id (90.0mm x 85mm)
CENG417 3.562"od 3.374"id (90.47mm x 85.7mm)
CENG417A 3.597"od 3.441"id (91.36mm x 87.4mm)

100/4 Bottom End
Code: CENG417
Sku: CENG417
Availability: In Stock
CENG417
£40.00
Qty
Code: CENG417A
Sku: CENG417A
Availability: In Stock
CENG417A
£40.00
Qty
Code: ENG417B
Sku: ENG417B
Availability: In Stock
ENG417B
£40.00
Qty

SPIN-ON OIL FILTERS

These Standard Oil Filters traps and holds all particles larger than 25 microns, while capturing a high percentage of even smaller particles, their dirt-holding capacity is significantly larger than the minimum manufacturer requirements between oil changes. The full-flow oil filters use arch-pleated, prescription-blended media, which provides low initial restriction to oil flow – less than 2 psi pressure drop when filtering oil at a rate of 4 gallons per minute at normal operating temperatures.

100/4 Bottom End

Replacement Parts

Code: CENG688
Sku: CENG688
Availability: In Stock
CENG688
£6.95
Qty

STEEL CRANKSHAFT

Our Steel Crankshafts are made from EN40B and Nitride hardened. To our drawings and specification by Britains leading manufacturer.

This steel crankshaft is made with the Works type 8 bolt fixing for the flywheel and is also ground ready for our rear oil seal kit. Requiring no additional machining to fit as it uses the standard main bearings and original 111.1mm stroke.

It can only be used with our Steel Con Rod Set (CENG432R).

For the person who wants the ultimate in performance, these obviously strengthen the bottom end considerably and mean that the engine can be reved safely to very high limits.

100/4 Bottom End
Code: CENG432K
Sku: CENG432K
Availability: In Stock
CENG432K
£2,450.00
Qty

STEEL CON ROD SET

These are H-Beam style made to our drawings and specification by Britains leading manufacturer, with conventional fully floating little ends and can therefore only run with pistons that contain circlip grooves (i.e. our pistons CENG409, CENG410, CENG411 and CENG409F).

These are considerably lighter and stronger than standard ones. Supplied as a set of 4.

Two types available, the 100/S fits with the standard 100/4 crank sizes or the others to suit our steel cranks with better quality big-end shells.

100/4 Bottom End
Code: CENG432R
Sku: CENG432R
Availability: In Stock
CENG432R
£1,295.00
Qty
Code: CENG403
Sku: CENG403
Availability: In Stock
CENG403
£1,995.00
Qty

Replacement Parts

Code: CENG605
Sku: CENG605
Availability: In Stock
CENG605
£12.95
Qty

CORE PLUG STRAP KIT

This kit is designed to fit across the core plugs to stop them blowing out when under high stress from race or rally conditions.

100/4 Bottom End
Code: CENG570
Sku: CENG570
Availability: In Stock
CENG570
£19.50
Qty

REAR CRANKSHAFT OIL SEAL CONVERSION KIT

When fitting this kit to the 100 it will require some machining to the crankshaft and cylinder block so therefore can only be fitted during a total engine rebuild. Although full instructions are supplied it is recommended that this kit is fitted by us or a qualified engineer. (A 4.2mm Drill & M5 Tap is also required). It is worth spending the money as, when fitted correctly, it really does stop those annoying oil leaks!

100/4 Bottom End
Code: CENG590
Sku: CENG590
Availability: In Stock
CENG590
£59.50
Qty
Code: CENG850D
Sku: CENG850D
Availability: In Stock
CENG850D
£1.95
Qty
Code: CENG850T
Sku: CENG850T
Availability: In Stock
CENG850T
£10.60
Qty

Replacement Parts

Code: CENG850S
Sku: CENG850S
Availability: In Stock
CENG850S
£12.95
Qty

ALUMINIUM ENGINE BACK PLATES

These Aluminium Engine Black Plates are much lighter and stronger than the Standard Engine Back Plates and machined to clear our rear crank oil seal kit.

Two types available:
- To suit original 4 cylinder mechanical clutch bellhousing.
- To suit a 6 cylinder hydraulic clutch bellhousing when fitted to a 100/4.

100/4 Bottom End
Code: CENG402
Sku: CENG402
Availability: In Stock
CENG402
£95.00
Qty
Code: CENG402A
Sku: CENG402A
Availability: In Stock
CENG402A
£95.00
Qty

LIGHTENED FLYWHEELS (EXCHANGE)

Due to the long stroke characteristics of the 100 engine the flywheel can be lightened substantially with no noticeable loss of torque or detriment to smooth running.

This makes the engine more willing to rev quicker and higher with an all round improvement in performance on a standard or fast road car.

Supplied to suit original 2 or 3 dowel clutch.

100/4 Bottom End
Code: CENG435AB
Sku: CENG435AB
Availability: In Stock
CENG435AB
£195.00
Qty
Code: CENG435A
Sku: CENG435A
Availability: In Stock
CENG435A
£165.00
Qty

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Welcome to the Denis Welch Motorsport website for Performance Parts. We cater for every aspect of work on your classic car be it road, race or rally, using our unrivalled success in many aspects of Motorsport to make your car as successful and reliable as possible.

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