how many thousands of an inch? litters? cubic inches? haha im curious is it worth it? channeled block? let me know whats up

 

Most people don't bother with the D-series; but it's probably been done to 1.8liters

 

yeah that what i thought. i wanna build like a mean d16a6 block with an y8 head

 

There's quite a few people that mod D-series; it's just not popular on H-T.

Most I've seen is 1mm OS on stock sleeves(76mm), and around 78 or 79mm with a resleeve. 1.8l is only possible with a D17 crankshaft/stroker.

It's very helpful because overboring not only increases displacement slightly, but also helps to deshroud the valves.

Humble Performance hit around 163whp/140ft-lb tq on a 78mm bore D16(using stock P08 head). Only mods were I/H/E(Bisimoto header) and Hondata S300.

 

so what is 1mm OS? like in litters? nice set up. did you boost that engine?

 

That's not my engine, and no, it's not boosted.

1mm OS= 1mm Oversize(going from 75mm bore to a 76mm bore). to figure out the displacement, you'll have to do some math:

what I do is convert everything to cm, makes it easier;
pi*(Bore/2)^2*Stroke*number of cylinders=displacement.

For instance, a 78mm bore D16:
pi*(7.8/2)^2*9*4=1720cc(or 1.7l). For reference, stock displacement is 1590cc(about 1.6l)

 

Supposedly the EF I just bought has it's A6 bored over 0.030. *shrug*

 

well obviously they weren't trying to make power by doing that.. they were most likely tryin to clean up deep gouges in the cylinder wall, and without a slight overbore the rings wouldn't have seated in properly.

 

whats the most bore i cant do on an d series?

 

kevin already said. a 1mm overbore is the most he's seen safely done. for such a small gain i would put the money for an overbore toward something else.

 

hmm yeah that does sound smater.

oh i have another question.

h series and d series are the only channeled blocks?

 

well my friend has a zc that is bored .5 over
that makes it 75.5mm bore
im pretty sure we figured out all that math and concluded it gained .1 litre

so .5mm over stock bore would potentially net you a 1.61L or roughly 1610ccs

 

It's not recommended to go larger than a 78mm bore on a sleeved block. It's the equivalent of trying to do an 87mm bore bseries. Its do-able but wont last long

 

i got a friend thats using stock components with bolts ons and is making 162whp. this is a d16z6 block, dohc zc pistons on stock rods, d16a6 head, intake/header/exhaust, and adjustable cam gear. he uses hondata s300, and had it professionally tuned.

 

hm... sounds good guys.

i guess ima have to replan my build