crxrx7

ENGINE HP SIZE DECK BORE STRK ROD
B18C1 170 1797 8.347 3.189 3.433 5.429
B18A1 130 1834 8.347 3.189 3.504 5.394
B16A3 160 1595 7.998 3.189 3.047 5.290
D16Y8 127 1590 8.347 2.953 3.543 5.394
D16Y7 106 1590 8.347 2.953 3.543 5.394
D16Z6 125 AS ABOVE

Well I had some crazy thoughts late tonight around 35. I was looking at the differences between the B16 and the D16.
If you look at the b16, the bore and the stroke are about the same. Like a square. On the d16 the bore and stroke are differnt by half and inch. Like a rectangle. I read once that the closest to a square is the best combo for some reason. I think that the reason the d16 has such a long stroke was because they needed more torque in the smaller/cheaper engine. The D16z6 make 106 lbs/tq while the b16 make 112 1bs/tq. This has to do with all sorts of other things but mainly the high compression ratio, bigger head and higher engine speed.

The higher engine speed also helps with the horsepower #s. I think thats why they gave the b16 such a short tranny also. I has no torque. Honda wanted the D16 to have enough torque to haul their cars around but they had to sacrafice the hp.

So heres my theory. If you want more torque get a longer crank. I don't think it matters what bore size you have but the bigger the better. The B16 has an 81mm bore while the D16 has a 75mm. If you want higher hp # get a shorter crank. The same goes with the bore. Doesn't matter. The only problem with getting a shorter crank is where the hell would you get one and why would you do this because it would decreace your displacement. You couldn't bore out your engine enough to replace it. It sounds good in theory though.

Well upon further investagion it occured to me that honda was screwing around like me and out popped the the B18.
Same deck height as the d16. Hence this is why you can use b18 rods in the d series. Same bore as the B16. They got the torque that I was looking for. So lets say I could bore out a D16 to 81mm. I would think that I would get the same torque #s as the b18. I would have to duplicate the compression ratio and port out the head a little to get the right flow. This would work. Get darton sleeves and have the bore be about 81mm. Maybe bigger if they could do it. This would be a total sleeper. you could have the hp and torque of a B18 looking so small in a D16. OH BOY. all i need is about $2500 and I am good to go.
Then since after it gets all built and everything is forged i could turbo it and get massive # from it. Oh ----. I need to stay up late every night.

Here are some more #s
Stroke
D16Z6 89.992
B18c1 87.198
B18a1 89.001
Now in this case the numbers are so close it would seem that it wouldn't make that much of a difference but it does. It will matter how fast you can spin this engine. The Z6 has the longest stroke which make for good torque with what it has to offer. But also has low rotating mass since the rods and pistons are smaller. The A1 has a shorter stroke so it can still make Ok hp but won't spin that fast. But the C1 has the shortest. If you guessed it they wanted it to spin even faster to get both hp and torque. It will also have lower rotating mass. Now what gets me is that if the c1 has the same bore but differnet stroke where are the 1.8 liters coming from. the only thing that I can think of is that the combution chamber has to be bigger. Where displacement comes from is the stroke,bore, and combustion volume. You can change two by adding what you take off of the other. Thats what I think.

crxrx7

It took me a little under an hour to write this so no stupid replys.

Semnos

The biggest bore I've read been used for a d-series is 79mm.
I don't think you can go bigger without sacrificing the strength of the sleeves...It was done on a resleeved block.
Remember that D-series blocks are smaller so the sleeves are also smaller you need some room for the coolant.
And Larry(Theoldone) Destroked his D16 to 1.5 liter with a custom crank to get a R/S ratio of 1.7.
A square engine puts less stress on the cilinder walls .... it can rev higher with less stress and last longer.
Just get a B18A or B18B it's cheaper.
Oh and a bored D-series to 79mm can not be boosted the cilinder would be to wezk for that.

88crxSi

LMAO, I hate to burst your bubble but bore has nothing to do w/ the "squareness" of the engine. It's ROD/STROKE ratio

SkunT

I was thinking the same thing.

that is a very good write up though. IM gonna have to read it a few times....

crxrx7

Thanks for pointing that out. I said that some where I just had the wrong part. I think that I said Piston/Stroke ratio.