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  1. modesign

    Restrictors in brake lines - what for?

    Further clarification of the Boxster brake system from the manual. "To reduce the brake pressure at the rear axle and to adapt the brake pressure to the wheel load distribution a brake proportioning valve with a switch over pressure of 25 bar and a reduction factor of 0.46 has been fitted."...
  2. modesign

    Restrictors in brake lines - what for?

    In the Porsche Boxster a pressure limit valve s fitted to restrict the line pressure to the rear brakes. Under IVA regulation the rear brakes must not lock before the fronts. I understand that this valve stops any chance of rear brake lock.
  3. modesign

    Wing Mirror

    Rod, When visibility got bad, on my 1939 Hillman you just wound the windscreen out and lent forward!! Sandy
  4. modesign

    Wing Mirror

    Yes the IVA mandates mirrors and they must meet the rear view parameters. It does not exclude additional devices. If all the manufacturers think it is a good idea why is pressure to change not applied? Is there a down side? OK Greg, Silly question as we are now looking at politicians changing...
  5. modesign

    Wing Mirror

    With the advent of reliable ,ultra small video cameras and similar screens why can they not be used instead of wing mirrors? Less liable to damage, less aero drag and possible cover of blind spots. I understand that current law does not allow them.
  6. modesign

    Windsceen Fit

    Thanks all. I will use buttons as Greg suggested with a film thickness of 3-4mm. I understand that the reason for the thicker film was to stop screen damage from uneven apertures Cheers, Sandy
  7. modesign

    Windsceen Fit

    I am currently working on a windscreen aperture shape. What is the typical adhesive film thickness used by the manufacturer to glue in the screen ? The replacement fitter I spoke to just pushed until the adhesive came out!
  8. modesign

    planitary gear sets at the axle hubs

    The overdrive was also used on Sunbeam Rapier for Race and Rally use as well as on the road cars. The main problem was that in standard form even in road cars the torque limit made it operational on 3rd and 4th gears only. The competition overdrives used a different spring arrangement and were...
  9. modesign

    WRX knock problem

    Years ago when I had a Shelby Daytona in the US. It had the same lack of boost problems. Seemed to be worse in winter. The engine was a 4 cylinder. Spoke to Shelby who immediately said that it was piston slap (deliberately wide clearances) being picked up by the knock sensor and that I should...
  10. modesign

    Mid engine gear linkage

    A simple but effective cable link is used on the Porsche Boxster. The system uses two cables. Worth a look. Sandy
  11. modesign

    Rockwell Hardness of cam bucket tappets

    From another posting is this the 4 valve engine that had a camshaft failure from lack of oil? As the origional project used all standard parts where possible have you checked the bucket size against a 2 valve engine. They are available new currently.A new one would give you hardness data.
  12. modesign

    I need race engine overhead cam help

    If it is any help all the spares, part engines, gearboxes etc for this project were purchased from Italy a few years back (5?) by an active US Stratos racer. He had spares such as cams.Maybe you could trace him. Regards
  13. modesign

    I need race engine overhead cam help

    The standard Dino 246 (2.4 litre 6 cylinder) engine is 92.5x60 with a cam timing of 40-52/53-31 lift 36.7mm inlet and 36mm exhaust. Power 195bhp.The standard engine revs to 7800rpm. The engine has a rep for wearing the camshafts if not allowed to warm up for a minute at low revs. I always...
  14. modesign

    Is a lighter car always better for cornering?

    Interesting point about road conditions with reference to tire width/grip. European rally cars use wide and just road legal (have to have a minimum of tread cuts) for the dry, less wide but heavily cut for wet and very narrow high profile heavily cut(studded in some cases))snow tires. Maximum...
  15. modesign

    Using Mcpherson Spindle in SLA setup

    The use of a strut hub with a ball joint fitting is used on many 'kit' cars to make a cheap twin link suspension. Typically UK spec Ford parts. The fittings range from a turned alloy top fitting to a welded part. As the KPI of a strut conversion is based on the origional strut fitting which in...
  16. modesign

    Objectively measuring and defining subjective steering "feel"

    The BMW is rear drive most others front. Is it easier to make a good steering feel without front drive problems? (see torque steer).The point about the diffeence between the road tester on track wanting a pointy high feedback steering and the average pwerson who is more comfortable with a deader...
  17. modesign

    Torque Steer

    Two subjects relevant to the last postings from Greg and M Loew. First in my experience as a successful designer of mechanical devices I have found educated guesses and relevant opinions very valuable. If all problems could be solved by the use of FBD why do some cars have bad torque steer and...
  18. modesign

    Need some advice or feedback on CFD? (Computation Fluid Dynamics)

    One advantage of the water tank was with the use of a glass bottom it allowed flow under the car to be looked at.A track under the tank allowed a camera to move at the same speed as the model. Regards, Sandy
  19. modesign

    Know of any good books?

    Good book on composite construction and materials is Competition car composites by Simon McBeath ISBN 1 85960 624 5 Haynes Publishing.
  20. modesign

    Hydraulic gearbox linkage.

    Have a look at the Porsche Boxster gear links. Uses two cables with a neat gear change lever mech. The links on the box are simple.The Boxster engine is central.

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