09-09-2018, 01:04 PM
(09-09-2018, 12:35 PM)Michael D Wrote: Browsing though what's on offer with the several respected specialist, I've come across a choice of cyliderheads that are supposed to enhance performance:
- Ricardo head (out of stock at the moment)
- Alta head - Brough Superior spec (either cast iron or alloy)
- Nippy / Ulster head (iron)
- Whatmogg-Hewitt head (alloy / aluminum)
I'd like to know what these heads have to offer in different aspects (apart from the obvious price differences) and what further changes may be needed when combined with other inlet and exhaust manifolds and a single 1 1/8 SU carb (i.e. ignition advance/retard; fuel mixture etc) ; no search engine has propped up any useful information (even the posts on the old forum I've found are not conclusive).
Dear Michael,
In my experience the standard 37 head is a good starting point — skimmed 10 or 15 thou. to make flat and slightly increase compression ratio. Check it is not already skimmed by measuring depth which is 1.5 ins standard form.
I use a 1.25 SU with no 6 needle and blue spring. Electronic ignition with fixed timing ie bob weights welded together.
Mine is essentially a road car but is
lively enough to take part in the odd sprint or friendly hill climb. Main thing is keeping the weight down and aim for around 30 bhp.
Charles