(Morrigan, as a synonym of Morgan of Arthurian legend)

Sunday, 27 September 2009

Cylinder Head removal

Well I managed to get the head of the engine today, all of the cylinders are in good condition, there is some coke on the piston crowns and the cylinder head needs a good de-coke, and likely the valves re-ground and the tappet shims re-doing.

The whole lot could also do with a good steam clean, will see if i can find somewhere to clean the block and head and also give the cylinder a de-glaze, to get everything back to new..

Hone-marks still in cylinders!

I've ordered a bunch of cleaning a painting supplies from Frosts which will allow me to progress through the various components and get them back to new.

At this point its looking good.

Monday, 21 September 2009

Throttle methods

Have been thinking about various throttle mechanisms, the options are:
  • Butterfly valve
  • Roller barrel
  • Twin roller barrel
  • Sliding plate
  • Twin roller profile
  • Iris (I've not seen any constructed like this, and would have poor flow characteristics - variable orifice plate)
  • Flaps (sort of a twin butterfly)
  • Twist mesh (slightly off the wall, and would need fatigue resistant filaments, but would be like the iris but with a venturi profile)
The primary search criteria is to extend the part throttle opening characteristics, i.e. to reduce the rate of opening for better control. But this also means keeping the fuel well mixed with the reduced air flow, and stopping it from ending up on the side walls.

Have played with roller barrel throttle bodies and believe that the size requirements are constrictive. The advantage of the butterfly is that it directs the air flow towards the injector at low flow rates thus encouraging mixing.

The construction for the butterfly version should be achievable through suitable casting and milling operations. Will need to save up for a large milling machine, and stepper motors to convert it to CNC, looking on the web a pretty sizable mill can be had for ~£700. With stepper motors available from ~£100 for a set of 4, but this is a long way down the line, need to build up casting kit first.

Saturday, 5 September 2009

Engine Model

Well, I've digitised as much of the engine and gearbox as is useful for design purposes (need some more detail in the mounting area, but have to clear the garage before i can get access).

The engine is standard 3.2L Jaguar AJ6, I've yet to work out how I'm going to weigh it and find the CoG, but with suitable levers there is always a way.

Initial Digitised AJ6 engine model

edit: got the garage cleared, and noticed how big the engine is (Huge!), its going to be interesting getting this all together into a vehicle. First job is to get it stripped and order parts before they become impossible to locate, thats if the liners are in good condition.