A little help with sleeves and pistons!!! A Few Questions

[Fifth Gear]

1. Check this right Im about to order some engine sleeves from Dart (or Darton) I called the company and this guy told me that they've only made two sleeves for the KA series and those were custom (I have to give him the bore specifications) and Im thinking about running with some JE pistons. But Im not sure if I should go with an 89mm or 90mm.

2. From what I hear DC sports has the best headers on the market, but Ive seen a couple of other rides and they have HotShot headers, whose better?

3. I want to run a T28 turbo or maybe something a little larger just a tad bit. So I have a question does a T28 even comes with a kit or will I have to buy everything seperate?

[Nismo_Freak]

1. You don't need sleeves for a KA engine, or any Nissan engine that is commonly swapped into a 240.

2. Turbo engines do not use "headers" they use a turbo manifold that is designed differently than a naturally aspirated manifold.

3. You will have to peice together your whole kit to run a T28.

You need to do alot of research on turbo systems before you start buying parts. It will save you alot of money and hard work by educating yourself on how the system works, and what is required as a basis of it.

[deviousKA]

You cannot sleeve a ka24.

Even if there was enough material to sleeve, you would gain absolutely nothing. Furthermore you would blow headgaskets between bores 1-2 2-4 more often than you change your oil.

The ka24 is last version of a long running design. The design has been updated throughout its lifetime and is engineered properly within the dimension constraints.

And when you call up a shop that SPECIALIZES IN SLEEVES and they mention they have done a custom sleeve for a particular engine, they will have that information on file and not need to ask the bore diameter. They just said that because it sounds good, they can make you a sleeve in any bore size you want.

Engineering is a critical thing, you would have better luck with a mail-order bride than mail-order sleeves for the ka24.

[LEMHEAD16]

Hondas Rule!

[deviousKA]

The reason hondas can be sleeved with aftermarket parts is because they are "sleeved" originally (sort of, actually they are cast in). The bores are not siamesed and by sleeving you are not affecting the cooling between cylinders at all. The KA bores are siamesed with cooling passages drilled diagonally between bores. The cylinder walls are steel and much thinner than a honda overall (half the cylinder wall being aluminum). In order to sleeve a nissan sand cast iron block you would have to remove most of the original cylinder wall material (which is quality steel to begin with ) and jeopardize and/or remove the cooling passages which are in very close proximity to cylinder wall (much closer than most of the cylinder wall thickness). There is not enough cylinder wall to insert any sort of a sleeve (wall thickness ~ 3/8"), even if there were (lets imagine the wall thickness was 1/2-3/4") the heat buildup would be so extreme you would be blowing headgaskets like crazy (material would not matter, even oringing wouldnt help).

Honda open deck aluminum blocks are inferior, to get anything close to a sand cast iron closed deck block strength you have to sacrifice way to much in cooling. Thats why aftermarket blocks are popular with honda, the stock blocks cannot be modified appropriately for decent strength, they werent really designed to be used for anything over 200hp. Open deck blocks are cheaper to manufacture because more of the cast setup can be reused, unlike a nissan sand cast iron block where each block is washed of sand and requires a new setup each time.

A nissan sand cast block from as far back as the 60's is stronger than an aluminum honda block, how many hondas do you see with over 1600 hp on a stock block? It cost nissan more to manufacture but thats just the way it is, be glad that you have one

BTW, I meant 1-2 3-4 in my previous post, not 1-2 2-4

[AmoebAssassin]

The reason hondas can be sleeved with aftermarket parts is because they are "sleeved" originally (sort of, actually they are cast in). The bores are not siamesed and by sleeving you are not affecting the cooling between cylinders at all. The KA bores are siamesed with cooling passages drilled diagonally between bores. The cylinder walls are steel and much thinner than a honda overall (half the cylinder wall being aluminum). In order to sleeve a nissan sand cast iron block you would have to remove most of the original cylinder wall material (which is quality steel to begin with ) and jeopardize and/or remove the cooling passages which are in very close proximity to cylinder wall (much closer than most of the cylinder wall thickness). There is not enough cylinder wall to insert any sort of a sleeve (wall thickness ~ 3/8"), even if there were (lets imagine the wall thickness was 1/2-3/4") the heat buildup would be so extreme you would be blowing headgaskets like crazy (material would not matter, even oringing wouldnt help).

Honda open deck aluminum blocks are inferior, to get anything close to a sand cast iron closed deck block strength you have to sacrifice way to much in cooling. Thats why aftermarket blocks are popular with honda, the stock blocks cannot be modified appropriately for decent strength, they werent really designed to be used for anything over 200hp. Open deck blocks are cheaper to manufacture because more of the cast setup can be reused, unlike a nissan sand cast iron block where each block is washed of sand and requires a new setup each time.

A nissan sand cast block from as far back as the 60's is stronger than an aluminum honda block, how many hondas do you see with over 1600 hp on a stock block? It cost nissan more to manufacture but thats just the way it is, be glad that you have one

BTW, I meant 1-2 3-4 in my previous post, not 1-2 2-4

Good post, I enjoyed the read.