Announcement

Collapse
No announcement yet.

will forged 2.8 pistons work in a 3100

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Rushman04
    replied
    Pm bashmanx

    Leave a comment:


  • bashmanx
    replied
    I have a set of forged 3100 pistons with stock forged rods. They have 150 miles on them, so very close to new. Nothing wrong with them. Are you interested?

    Leave a comment:


  • no_doz
    replied
    I have no clue how my crank trigger post ended up in here, sorry about that.

    Leave a comment:

  • Superdave
    Been there, Built that.

  • Superdave
    replied
    Gen 2 heads have a 26.4cc combustion chamber, 3100/3400 has a 28.6cc


    Just an FYI.

    Leave a comment:

  • SappySE107
    WOT-Tech

  • SappySE107
    replied
    We sell forged pistons for the 2.8, 3.1, 3.4, 3100, and 3400 engines, for stock or .927" SBC pin that work with our forged rods. Heavy duty pins, extra milling to lighten the pistons, and skirt/top and hard anodizing options are also available. We use Total Seal rings for these piston sets.

    http://wot-tech.com/shop/gm-60v6/for.../prod_262.html

    Leave a comment:

  • Guest
    Guest

  • Guest
    Guest replied
    You can use the 2.8 pistons in a 3100, but you also have to change the crank, which will give you a displacement of 2.8L ("2800"?), and will if the forged pistons produce the same SCR as the stock counter part reduce the SCR to 8.9:1 from 9.5:1. The good thing here is that the gen2 pistons do not come proud of the block and so thinner head gaskets could be used to raise the SCR slightly, IIRC it would be around 9.2:1 at that point.

    If you are referring to the stock TGP pistons, they are not forged, they are cast. This would give you an SCR of 8.8:1, just like the stock TGP had, since the combustion chambers are the same between gen2 and 3. Again, a thinner head gasket could be used but only raises the SCR to about 9.0:1 or so.

    Why are you wanting to run forged pistons? I have found that very few people actually need or benefit from using forged pistons where cast is usually a better choice.

    no_doz; what problem with the crank trigger?

    Leave a comment:


  • no_doz
    replied
    Will a set of forged pistons from a turbo 3.1 work with this combination? and if so what would the compression ratio be?

    Also, will him using a Gen 2 crank eliminate the problem with the crank sensor? if not what is needed to make the 7x crank trigger work with the OBD2 system?

    Leave a comment:


  • TREsab
    replied
    where can i find these forged 3.1L pistons

    Leave a comment:


  • sharkey
    replied
    i thought the 2.8l trw pistons were discontinued anyways. but no, they wont work.

    there are forged pistons for the 3.1l, and will work with the 3100

    Leave a comment:

  • Doubt_Incarnate
    I still watch ROBOTECH!

  • Doubt_Incarnate
    replied
    no. the connecting rods are the same also, so in order to make up for the added stroke of the 3.1/3100, the pistons have a shorter compresion height (center of pin to top of piston), so the 2.8 pistons is way to tall.

    Leave a comment:


  • TREsab
    started a topic will forged 2.8 pistons work in a 3100

    will forged 2.8 pistons work in a 3100

    will a set of forged 2.8 TRW pistons work in a 3100 engine? i know they have the same bore but is everything else the same?
Working...
X