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  1. 122344

    Offset question?

    If you want to install different wheels to your TR7 determine the space in the rear wheel opening between the inner body and the rear axle flange. Minus a little clearance that is your max back space. The front will have plenty of room. The offset is where the wheel mounting flange is in relation to the rim center. Most modern production wheels are 35 to 45 mm off center. A 7 inch rim is 178 mm. With a center at 89mm plus 43mm offset equals 132mm backspace plus about 12mm for the rim lip. Wheel spacers/ adapters have their own studs and can be a different bolt circle diameter than the axle flange. Don't forget the wheel center hole compatibility . 4x100 use to be a common Japanese bolt circle diameter.
  2. 122344

    Offset question?

    Have just gone through this with my Amazon, there is a differences between offset and back spacing. A narrow wheel with 0 offset will have less backspacing than a wide wheel with 0 offset. An back spacing determines if the wheels will physically fit on the hub/brake/ suspension.. The diameter of the hole in the rim and the nose of the hub must be compatible or made to be. Also will the rims center on the hub or by the lug nut tapper. 16x7 Toyota rims replacing 15x5.5
  3. 122344

    How to measure a Cam in the Hand

    While your in the shed here is a useful tool you could fab to occupy your time
  4. 122344

    How to measure a Cam in the Hand

    some cam specs. http://www.hottr6.com/triumph/tr6cams.html
  5. 122344

    Tr6 Camshaft

    Looks like it's time to get out the dial indicator and a degree wheel. Rainy day reading https://www.tildentechnologies.com/Cams/CamDesign.html
  6. 122344

    Tr6 Camshaft

    The cam spec card you receive with your cam will list the valve opening and closing point in crank shaft degrees. So you could calculate the lift per degree of camshaft rotation.The rate of the valve opening has limitations related to the diameter of the lifter. I have always thought of camshaft duration and compression ratio as linked. If you want to add camshaft duration you need to add compression pressure. At lower rpm you will have lower effective pressure so a higher than standard ratio is needed and at the higher rpm of volumetric efficiency the actual compression of the engine will be realized. Triumph had knowledgeable engineers designing their cams but there has been much experimentation in the last 50 years.
  7. 122344


    I had a similar experience on this site. I could not reset my password because I have a new email address. Multiple messages to the wizard behind the curtain then just opened a new account
  8. 122344

    Megajolt for the Thug

    here is a photo of Triumph 3 cylinder motor cycle throttle bodies on a Vitess 2.0L. Each group of 3 throttle bodies has a fuel rail, pressure regulator and throttle switch as manufactured. Some thing to think about