2.8 to 3.1 Stroker Pistons RWD

[GearJammerR]

Hey everyone!

Ive got a S10 2.8 TBI for starters, Bone stock, Id like to stroke it with a 3.1 crank and pistons, I know that 2.8 to 3.1 share the same bore so but changing cranks means different pistons.

Ive used the search bar, and all the threads ive read are helpfull but none say exactly which pistons to use. Im running iron heads, would GENII Fwd pistons work? if they dont, a link to summit racing would be appreciated! Also would the crank from a Fwd motor work too? I can probably get both those for free, thats why im curious!

Lastly, I live all the way up here in Canada EH! otherwise id be slapping a 3.4 in there already. To bad theres none around where i live here in Winnipeg!!!!!!
Thanks to all for the info!

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[Driver_10]

The 3.1 and the 2.8l share the same pistons, connecting rods and heads. Only the crank is different. BTW make sure that you have an internally balanced flywheel before going forward with your build. Some of the older 2.8l were externally balanced via welded flywheel counterweights.

[betterthanyou]

You can use a FWD crank but not the pistons. Federal Mogul sells a nice set of pistons with coated skirts. You will have to get some machining done but you could turn your 2.8L into a 3.2L. I did it with my Trooper and its a great setup.

[GearJammerR]

ok, so the crank yes! pistons no..... Also my 2.8 is a 87, so i need a neutrally balanced flywheel or can I have mine rebalanced? Also will my harmonic balancer bolt to the crank snout? and my flywheel too?

I looked on the federal mogul website and they list sealed power pistons, with the coating. Im assumming those are them! Summit List price is like $20 bucks a peice, so not too bad at all

Betterthanyou, What kind of setup is in your trooper? Im thinking something sorta similar for my s10 4x4........

Mostly just increase the displacement and a good rebuild, maybe clean up the heads a little bit. And also put a mild cam and the bigger TBI unit from a 4.3

[bob442]

WTF are you talking about no 3400's? theres 30 of them at bucks auto!

[GearJammerR]

Lol not a 3400 but a 3.4 from a '93 to '95 camaro, with iron heads!!!

[bob442]

there is so much room in a s10, its not even worth getting a 3.4 block to start with. using all the accessories right from a w-body would be the way to go.

[Driver_10]

You can use a FWD crank but not the pistons. Federal Mogul sells a nice set of pistons with coated skirts. You will have to get some machining done but you could turn your 2.8L into a 3.2L. I did it with my Trooper and its a great setup.

Is the piston comp height different or something? I was under the assumption that a 3.1l was just a stroked out 2.8l.

[GearJammerR]

yepp, you got it, if the piston travels a longer distance with increased stroke, it would literally pop out of the block

[betterthanyou]

Yes only the pin height changed. That why you just need pistons and the crank but the rods can stay to make a 3.1L.

Here is a link to my 3.2L Trooper build. http://members.shaw.ca/isuzutrooper/isuzueng.htm

If you are interested I sell a big bore TBI kit on my main page. http://members.shaw.ca/isuzutrooper/