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Cam question

Discussion in '"Stock" Alpine' started by clhiller, Nov 19, 2020.

  1. clhiller

    clhiller Silver Level Sponsor

    In the process of rehabbing my new-to-me 1960 Series 1 last winter, I found that the block was out of a RapierII.
    I have the alloy head and appropriate carbs on it, but was wondering if the cam specs are different between the Rapier and the Alpine?
     
  2. jumpinjan

    jumpinjan Bronze Level Sponsor

    Those cams will show wear even at 30k miles. I don't have an answer your question, but if you rebuild it, get the cam re-gound by Delta in the "KB" profile.
    Jan
     
  3. husky drvr

    husky drvr Platinum Level Sponsor

    clhiller,

    If your engine is assembled and operating with the alloy head, you don't have the Rapier cam. The Rapier II originally used an iron head. The valve arrangement differs between the two heads which causes incompatible valve motions on the center two cylinders. The question is which alloy head and cam you have installed. The three main engine cam specs can be found in WSM 124, General data section.

    cam differences

    Maybe this pic will help.

    cyl#2 lobes circled in black

    exhaust is red

    intake is blue

    fuel pump lobe is green

    drive gears are circled in purple - the narrow drive gear is for a 1725 alloy head. the wider gears are for three main engines

    these are two alloy head and two iron head cams - one of the alloy head cams is for a five main engine

    [​IMG]

    Hope this helps,
     
    Last edited: Nov 19, 2020
  4. clhiller

    clhiller Silver Level Sponsor

    It is together and running fine. The reason I ask is that the distributor that’s on it is from the Rapier and I was thinking about getting it rebuilt and recurved by Jeff at Advanced Distributors. I wanted to get the correct curve for the Alpine cam.
     
  5. husky drvr

    husky drvr Platinum Level Sponsor

    OK, WSM 124, General Data section, page 17, at bottom of page - first set of numbers is S I, II, & III

    ....................................................................................................... - second set is S IV

    Vacuum advance is same for all.

    (full retard) is referring to the vernier scale adjustment I think.

    HTH,

    upload_2020-11-19_18-51-53.png
     

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