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100/4 Top End
NEW CAMSHAFT KITS
In 2003 we totally revised not only the way we sell our camshafts but also the design and manufacturing. We now only sell camshafts packaged complete with followers and cam lube for assembly. There are considerable differences between new and reground cams so the decision should be taken carefully.
Manufactured to the original specifications with original lobe position. The oil feed to the centre journal is as standard and the lobes are made as large as possible to reduce wear. Using the best material available for long life and fully heat treated.
Now also available as a Billet Blank for final profiling and heat treatment to your specification, by ourselves or your cam grinder.
PROFILES
- DWR 1 Profile is the only camshaft which will fit without any valve pocket reliefs. This profile is similar to the original 100M cam and so works well in any standard or mildly tuned car.
- DWR 2 Profile is high lift with 300 degrees duration (may require valve pockets). This profile is very similar to the original ‘Works' profile and ideal for race and rally cars.
- NOW AVAILABLE
DWR 4 profile is our 100/S interpretation with 278 degrees duration. Which puts it midway between our 1 and 2 in performance terms and very suitable for a Mille Miglia type rally 100/4 or 100/S..
PLEASE NOTE: Prices include cam followers and cam lube, but not pushrods.
For a Camshaft Profile specification sheet please click the attachment below.
If you require any further information please contact our Parts Team on +44(0)1543 472 244 or email: sales@bighealey.co.uk
| Attachment | Size |
|---|---|
| Cam Timing Chart 4 Cylinder.pdf | 109.88 KB |
EXCHANGE CAMSHAFT KITS
In 2003 we totally revised not only the way we sell our camshafts but also the design and manufacturing. We now only sell camshafts packaged complete with followers and cam lube for assembly. There are considerable differences between new and reground cams so the decision should be taken carefully.
Reground old units limit the lobe size and position, with this in mind we only accept old units which have not been reground before both on the lobes and journals. Using the original material we heat-treat these to the best limits available.
PROFILES
- DWR 1 Profile is the only camshaft which will fit without any valve pocket reliefs. This profile is similar to the original 00M cam and so works well in any standard or mildly tuned car. (To exchange your old camshaft for a DWR 1 use ENG457/1 or to buy a DWR 1 without trading in, use ENG457A/1)
- DWR 2 Profile is high lift with 300 degrees duration (may require valve pockets). This profile is very similar to the original ‘Works’ profile and ideal for race and rally cars.
- NOW AVAILABLE
DWR 4 Profile is our 100/S interpretation with 278 degrees duration. Which puts it midway between our 1 and 2 in performance terms and very suitable for a Mille Miglia type rally 100/4 or 100/S.
PLEASE NOTE: Prices include followers and cam lube, but not pushrods.
For a Camshaft Profile specification sheet please click the attachment below.
If you require any further information please contact our Parts Team on +44(0)1543 472 244 or email: sales@bighealey.co.uk
| Attachment | Size |
|---|---|
| Cam Timing Chart 4 Cylinder.pdf | 109.88 KB |
ALUMINIUM CYLINDER HEADS - 4 CYLINDER
The Denis Welch Motorsport Aluminum Cylinder Heads are manufactured from our own drawings, patterns and castings, and are completely computer machined to our own specifications.
The development process has seen them, crack tested and inspected at every stage of production. They have also been run on our Dynamometer to remove all faults.
Finally, we have sawn them in half to get right inside the casting, ports, oil and water galleries. During production every head is pressure tested and fitted with precision ground, replaceable, lead-free valve seats of the latest material, where applicable they are complemented by our top quality valves, guides, springs and top caps.
These are complete and ready to fit with new rocker and manifold studs.
BARE HEAD
Fully machined bare head (as cast ports) with valve inserts fitted and semi-formed seats. Ready for you to supply and fit valve guides, cut seats, final skim head gasket face and assemble with your components.(Must use 6 cylinder exhaust valves).
STANDARD COMPLETE
Supplied ready assembled by us in our own factory. Bronze valve guides, stainless steel valves, steel valve top caps and heavy duty springs etc. Head gasket face final skimmed giving a combustion chamber of 62cc as original.
FAST ROAD COMPLETE
As ‘Standard’ with the addition of CNC machined ports, all symmetrical and matching. Aluminium valve top caps, competition valve springs and top hat stem seals. 66cc chamber volume.
FULL RACE COMPLETE
As ‘Fast Road’ with larger CNC machined ports, for increased flow. The significantly larger exhaust ports are best suited to a large bore manifold gasket and big bore exhaust. They also benefit from dowel holes machined in the manifold face to match the inlet manifolds precisely to the ports. 66cc chamber volume.
Both inlet and exhausts ports are hand felted after CNC machining to achieving the desired surface finish and gas flow characteristics.
Please note – if intending to use with our roller rockers (CENG502K), please specify with order to have push rod holes machined to suit.
All our inlet manifolds are now also available CNC ported along with dowel holes to match seamlessly to our cylinder heads.
If you require any further information please contact our Parts Team on +44(0)1543 472 244 or email: sales@bighealey.co.uk
BIG BORE MANIFOLD GASKET - 4 CYLINDER
Our 4 Cylinder Big Bore Manifold Gasket is manufactured from top quality materials with larger port holes.
VALVES
All our valves are made from one-piece forgings in 214N stainless steel with stellite tips and plasma nitrided stems for increased life.
Suitable for both leaded and unleaded fuel.
These are made to the lightest design using standard size stems and collets.
COMPETITION VALVE SPRING SET
Our Competition Valve Spring Set provides increased seat and nose pressure.
Please note: To fit these springs in the 100 it is necessary to use (CENG 731 or ENG731) 3000 Top Caps.
- ENG525HD - Double springs to suit standard & 100M cams
- CENG525 - Single springs to suit higher performance cams i.e our DWR 2
COLISBRO-BRONZE VALVE GUIDES
These are essential in all engines with gas flowed ports whether aluminium or iron and engines converted to lead-free fuel.
Precision turned with honed bores these should not require reaming after fitment.
Colisbro material being of a copper colour should not be confused with the inferior yellow brass coloured cheaper alternatives.
Now available - Tapered Bronze Value Guide.
LIGHTWEIGHT VALVE TOP CAPS
Our Valve Top Caps are manufactured from either top quality aircraft aluminium and are hard anodised red or high grade steel and heat-treated, both are to suit 3000 size springs.
Prices stated are per item.
VALVE STEM OIL SEALS
Our Valve Stem Oil Seals are top-hat type seals which fit around the top of the valve guide.
They only fit with our competition single-valve springs (CENG525 - Single springs to suit higher performance cams i.e our DWR 2)
Prices stated are per item.