Im sure everyone on this board has seen that by running larger pistons/bigger bore, you can make alot more HP running NA. Ive seen 81mm sleeved blocks making around 200-210HP, and 84mm sleeved block making 210-240HP. My question is, if larger sleeved blocks really making more HP, why doent anyone resleeve their blocks to the largest possible mm a Bseries block can take? I heard B series blocks can take up to 87mm sleeves. Why doesnt anyone go with that? Just wondering..........

 

It's like choosing between 12.5:1 compression and 11.0:1. You know that the first one will give you more power, but what you give up is drivabilitly.

An 87mm bore sounds like it would be a race only idea. A drag race only type thing..most people on this board are into road racing. Although, I don't know exactly what a 87mm bore would do in a road racing situation, I assume that it wouldn't be the best thing

 

 

that's right, just like you can spend same amount of money to get a turbo R and makes more power than a N/A R, but not everyone doing that.

 

I don't think drivability is a problem with resleeved blocks. 87mm bore would be fine in road racing conditions provided everything was done properly and tolerances were kept up to standard. But like everyone knows, the more power you make, the more stress is put on other components. Overall reliability would generally decrease as you make more power regarless of how you make the added power, even if it is only I/H/E.

I see the main reason that most ppl don't resleeve blocks is because it would mean doing engine mods and not just your basic bolt-on. Many people would feel initimidated when doing actual internal modifications to an already great engine. There are a lot more variables when dealing with internal engine mods compared to bolt-on mods.

 

87mm sleeves on a B series motor is not recommended for daily drivers. The larger you go on the bore, the thinner the walls get between the pistons. If you look at a block, there isnt much metal between the pistons. 84-85mm is the largest i would ever consider on a daily driven car. Any larger and you risk having sealing problems between the head and block.

Also many people do not go bigger bore due to the significant cost that is involved from custom pistons, resleeving, etc...

Cheapest route is B20 block with custom pistons. You get the 84mm bore without the huge expense.

 

What about the new Dart/Payn Block that is coming out soon. I don't know the details but Dart as in Dart Heads, of small block& big block domestic fame has teamed up with import tuner/eng Payn Technologies to produce a new B-series block. Here are the specs: http://www.payntechnologies.com/hondablock.html

Mattj

 

The Payn block is fine... Great block if you really want to build an engine from top to bottom with the power/reliability we want, but we're talking about a whole different level of costs. If you want to build the best engine possible, no cost concerns, that would probably be the best way to do it.

 

Your probably right in saying 87mm is a little too much. I would go 84, but probably not 87. I don't think many people are doing 87 anyways.