Herald Fast Road Cams

[948_droptop]

Hi All 

Would anyone know if they make performance cam shafts for the 948 twin cam? Also would a cam for the 1200 fit? any advice would be appreciated. 

Best,

Shane

[Clive]

Not sure whether the 948 had a large or small journal cam, but they are all available. 

1200 cams are early and late and the 12/50 may be different again? Just choose the one that suits the way you plan to use the car.

(presume you mean 948 twin carb.... a twin cam would be very interesting!)

[948_droptop]

hey clive thanks heaps for the advice. So i assume that if the 948 had a small journal cam - any fast road cam made for a small journal cam would suit? will have a look. and yes twin carb! wouldn't a twin cam be a treat. thanks again.

[Clive]

Yep, you are correct. Small journal cams have bearings in the block, so a parts diagram should help. Or give canley classics a call for advice (they REALLY know their stuff)

Or try Colin on here, he is the early Herald chap.

 

[Colin Lindsay]

Early 948 Herald saloon camshaft was part number 204490, coupe was 202931 - the coupe was twin-carb. Rimmer's site claims this is the same part number for the 1200 coupe as I have listed for the 948 coupe - this points to a straight swap, but they also list the Spitfire version 211433 for the Herald 1200.

1200 was 211256 while early Spitfire 1147 was 211433 -  the Spitfire MK3 is allegedly the one to go for if it'll fit the 948 block, which is something I've never checked before, as opposed to the early shafts.

All but the late 13/60 were small journal camshafts. 

Check Moss Europe as they seem to have performance camshafts listed.

https://www.moss-europe.co.uk/camshaft-fast-road-small-journal-new-212164-th5.html

Here's a link with a lot of interesting spec:

http://www.auskellian.com/paul/links_files/spitfire_cam_specs.htm

Herald data is below, if I've copied it correctly from a word document:

948:

Valve Timing
Inlet opens	10° B. T. D. C.
Inlet closes	50° A. B. D. C.
Exhaust opens	50° B. B. D. C.
Exhaust closes	10° A.T.D. C.

Herald 1200 Engine Nos:
GA.HE to GA. 164,889 HE – Inlet opens	12° B. T. D. C.
GA. 177,973 HE to GA. 178,000 HE – Inlet closes	52° A. B. D. C.
GB. 1 HE to GB. 2,700 HE – Exhaust opens	52° B. B. D. C.
GB. 1 HE to GB. 2,700 HE – Exhaust closes	12° A. T. D. C.
All other Herald 1200 and Herald 12/50 engines – Inlet opens	18° B.T.D. C.
All other Herald 1200 and Herald 12/50 engines – Inlet closes	58° A. B. D. C.
All other Herald 1200 and Herald 12/50 engines – Exhaust opens	58° B. B. D. C.
All other Herald 1200 and Herald 12/50 engines – Exhaust closes	18° A.T.D.C.

[DanMi]

The MK3 cam was fitted to the late Mk2 spit (I guess that should be the other way round), so should fit. Cam bearings were not always fitted to small journal cam engines. I have an early mk2 spit block in which the cam runs directly in the block and a late with bearings, the late mk2/mk3 spit cams fits both. So any small journal cam will fit. late mk2/3 is 65/25 profile.