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New School Custom Pistons

Discussion in 'Rootes Racing' started by spmdr, Jul 8, 2021.

  1. spmdr

    spmdr Donation Time

    Now that I have settled on a "New School" Rod, I need Custom "New School" Pistons, with a .787 pin.

    Looking on ebay for pins, I found these interesting pistons, that use that small pin.


    Too bad they are a bit too big for an Alpine.

    I'll most likely have a more old school looking piston.

    But who knows...

    I'm looking at/for a ring package like this:

    1.2 mm top
    1.2 mm second
    3 mm oil
  2. Jay Laifman

    Jay Laifman Donation Time

    Hi Dan. Per another post, when I had my engine built, the guy who helped was a Lotus racing expert. He had a set of rings that he favored - from his Lotus engines. To use them, it meant I had to go to 55 over. So that's what we did. It makes for 1780 cc. You may want to look into what the Lotus guys do for their custom pistons. I'll be you could find some slick stuff there that could work.
  3. spmdr

    spmdr Donation Time

    The rings I'm looking at are a mix of my choice for the top ring size (1.2mm)

    and the piston guys choice for an oil ring (3mm).

    Top rings have been coming down in thickness.

    Old school was happy with 1/16" (1.5mm)

    New school likes smaller, around .040 (1mm)

    I like to split the difference with .047 (1.2mm) for a bit more durability.

    The ring package I'm looking at is common in the Toyota 1.8 L with a STD bore of 3.228 (82mm)

    The Hastings # is 2C5087S 1.2mm top, 1.2mm second and 3mm oil.

    BTW, even though this is in the "Racing" section, I expect the pistons and rings to work fine on the street, as well.

    Based on what I have seen, it wouldn't take much to be BETTER than stock Alpine rings!

    My next choice is bore size, 82mm or 82.5mm for the first set of pistons.
  4. spmdr

    spmdr Donation Time

    Jay, can you get more info about the Lotus rings, like the width?

    .055 over is 3.265? A little bigger than I want to go, to start.
  5. Jay Laifman

    Jay Laifman Donation Time

    For point of reference, my bore is 82.8mm.
  6. Jay Laifman

    Jay Laifman Donation Time

    Just crossed posts. The guy who did the engine is actually the guy who is helping on the Elva race car we are restoring. I'll ask him what he used.
  7. spmdr

    spmdr Donation Time

    Jay, do you have the info on the pistons? Who made them?
  8. Jay Laifman

    Jay Laifman Donation Time

    We custom ordered them. It was either Jahns or Arias. I think it was Jahns. I just spoke with the guy who did them. He doesn't recall which special set of rings he used in those days - but said he would have got them for Dave Bean, a Lotus parts shop. He said regardless, he would get a modern narrow ring pack now and use JE.
  9. spmdr

    spmdr Donation Time

    I bought Pistons from J&E in the past but that was a long time ago,

    and like a LOT of companies, they have changed a LOT.

    I have not recently looked at J&E pistons but at this point I needed to cover that base.

    Based on their web site, J&E clearly has more forging types available than other sources,

    even though the salesman I talked to seemed to be quite ignorant about forging availability.

    One thing I did find out, J&E is NOT the best priced!

    I was not impressed with the J&E CUSTOM piston order form!

    I didn't see any place to spec the Location of the ring grooves,

    AND NO place to even SUGGEST special NOTES to consider/build to.

    J&E's order form asks a lot of info about the engine

    and less about the actual piston you want.

    The jury is still out on J&E, but it's not looking good.

    I have been referred to a new Piston manufacturer in Long Beach, but they are weak with their phone coverage...
    Last edited: Jul 22, 2021
  10. spmdr

    spmdr Donation Time

    The Racetec custom Pistons are here!

    ...to go with the EXtra long rods...

    IMG_20220622_130546437.jpg IMG_20220622_130853245.jpg IMG_20220622_130717055.jpg
    Last edited: Jun 22, 2022
  11. spmdr

    spmdr Donation Time

    For the record, the New School pistons have these weights:

    Piston ....... 308g

    pin ..... 90.5g

    pin clips .....1.5g

    rings ...... 19g

    total .........419g



    pin .............152-156g


    rings .................36g

    alpine_64 likes this.
  12. alpine_64

    alpine_64 Donation Time

    Not a bad saving.. I assume the weight reduction on rods is even better... Combined that will be a lot less reciprocating mass

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