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Icarus60

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  • Location
    Nailsea, south of Bristol
  • Cars Owned:
    1958 TR3A, 1962 TR4. British Motorcycles,Fixing mechanical and electrical things and making electronic boxes.

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  1. Thanks Brian and Mick I was not aware that the two outer manifold studs are drilled through into the outer head stud bores and I suspect I’m far from being alone on this. I can confirm that this is the case on the head I’m working on but with the correct depth studs fitted they are well short of contacting the head studs. It looks to me therefore that it will only be a problem if incorrect, excessively long, manifold studs are used. I wonder however how many reluctant to move cylinder heads have been caused by over long manifold studs? Onwards and sideways Rog
  2. Yes I have a couple of gaskets and I’ll give it a go and report back. Thanks and regards Rog
  3. Thank you Mick but I will still appreciate knowing the stud positions if anybody has the dimensions available. regards Rog
  4. Colleagues I have a high port head with both lower outer exhaust manifold studs sheared off below the surface. I plan to drill them out but could benefit by making up a, reusable, drill guide jig to drill them as centrally as possible. Can any body help with accurate dimension for the inlet and exhaust manifold stud centres ? Any help appreciated Regards Rog
  5. I cut mine with a sharp knife with a single vertical cut top to bottom. They are then very easy to install onto the mounting plate and it makes little or no difference to the isolation characteristics of the motor once installed.
  6. I have read it Peter and it is very informative and it is one of several sources that has given me a reasonable understanding of Weber DCOE type carbs. I have a setup very similar to Mike and I was interested in the idle jets that he finished up with. Regards Rog
  7. Brilliant Mike - thanks. What size idle jets did you finish up with to get a reasonable idle and transition. Regards Rog
  8. Nice. Couple of questions if I may. Did you have them setup for your engine when you bought them and before going on the rolling road? What jet sizes and emulsion tubes are fitted? Thanks and regards
  9. To help in making an informed guess of the expected compression pressure in PSI, multiply the compression ratio by 20 and subtract twenty. Making an informed guess using this method is considered preferable to making an uninformed guess.
  10. Peter It’s handy that you can multiply the Compression Ratio by 20 and then subtract 20 to get an estimate of the compression pressure in PSI. This seems to work pretty well as a starting point even though it’s not an exact science. All plugs out, good battery and wide open throttle seems to give comparative values Rog
  11. Icarus60

    TDC, ??

    Pete I made up a TDC lever using an old spark plug. I tension the external part of lever upwards with an elastic band and as the lever has about a 5:1 ratio it is simple to determine TDC. The off the shelf tools are great for central plugs but you have to careful when using them when the spark plug is inclined as they can jam. regards Rog
  12. Hello There,

    Thanks for getting in touch my home number is 0161 494 5047.

    Best Peter

  13. Peter Please PM your telephone number to me and I will give you a call on this. Regards Rog
  14. It is a good idea and this has actually been a standard practice on piston aero engine for many years. Google Lycoming pressure test for some good info. ( It is also standard practice to cut up the old oil filter on each change to see if the bits are getting any bigger etc) I hope you sort it Bob Rog
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