If I bore out a b16 block to 85 or 86mm with sleeves, would it have the same displacement as a plain ls block? Also, which would have the best r/s be between the two? Thanks

 

B16 bored out to 85mm with net u 1.76l, a 86mm bore will give u exactly 1.8l's. B16a has the best r/s ratio.


Modified by SpdFrk at 2:08 AM 10/13/2003

 

B16=1.74:1
B18=1.58 I believe
1.75:1 is the best and that is why the B16 is so damn good
So if you want a real good high rever use the B16.

 

So I should stick with the b16 internals, or us something else? For example, ls internals? Thanks

 

gwaa
1.74 is not the 'best'
I bet you wont find one semi / tractor / or boat motor with that high a rod:stroke.
I like lower rod stroke because it makes more low rpm power easier.

 

86 x 77.4 = 1798 which is aabut the same displacement as a B18C1/5 but 36cc smaller than a B18A/B...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by -KangaRod- &raquo;</TD></TR><TR><TD CLASS="quote">gwaa
1.74 is not the 'best'
I bet you wont find one semi / tractor / or boat motor with that high a rod:stroke.
I like lower rod stroke because it makes more low rpm power easier.</TD></TR></TABLE>

B16 has the best r/s ratio out of all the b-series blocks.

Hondas have no low rpm power. They were designed to make high end power. Having a higher r/s ratio makes the engine capable to rev higher safely.

 

If you are looking for a good street motor build the head and put some high comp pistons in and keep the stock B16 rods and crank. If you still want a good r/s ratio and want to go a little farther look into a B17 crank.

 

Great, thanks everyone for the advice. I now know what to do, I'll start buying parts very soon.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SpdFrk &raquo;</TD></TR><TR><TD CLASS="quote">
B16 has the best r/s ratio out of all the b-series blocks.

Hondas have no low rpm power. They were designed to make high end power. Having a higher r/s ratio makes the engine capable to rev higher safely.
</TD></TR></TABLE>
If 1.74 is the best, then why would an LsVtec walk a B16 in the quarter? If its only displacement, then why does an LsVtec have little trouble with a GsR too.
I'll give you a hint, Its rod:stroke. Like I said, Different RodStrokes, for Different Folks. 1.74 sucks for low end power. I like to win drag races so I need a lower Rod:stroke.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by -KangaRod- &raquo;</TD></TR><TR><TD CLASS="quote">
If 1.74 is the best, then why would an LsVtec walk a B16 in the quarter? If its only displacement, then why does an LsVtec have little trouble with a GsR too.
I'll give you a hint, Its rod:stroke. Like I said, Different RodStrokes, for Different Folks. 1.74 sucks for low end power. I like to win drag races so I need a lower Rod:stroke.</TD></TR></TABLE>

1.74 is the best for reliability, unlike the 1.58 R/S found in the LS/VTEC. A LSVTEC would beat a b16 because it has more displacement, from a longer stroke.

Rod/Stroke is not necessarily the deciding factor in an engines power.

Rod/Stroke ratio is a way of determining how fast the piston is traveling inside the cylinder.


Here is very informative link: http://www.stahlheaders.com/Lit_Rod%20Length.htm


Modified by SiRWanabe at 3:45 PM 10/13/2003

 

Why would a lumpy 351 walk a ls/vtec, more power but usually when somebody says "best" I assume safe and realiable. Rev a B16 to 10k with proper valvetrain all day cause its perfect for that due to the little outward force on the walls, ls/vtec you need more then valvtrain to run 10k safely. Do you know what low r/s does to a motor? we arnt making up ****, low r/s is not good for a fully reliable everyday motor, now dont say it cant be reliable cause it can but 1.74 will blow the doors of 1.58 for a reliable everyday car. When you arnt reving r/s isnt as big of a deal but to make honda power you need to rev so the better the r/s the better the motor. Face it hondas will not can not and never will make torque so they must rev.

 

first and formost, its not 1.58:1 for an LsVtec, its 1.54:1...
in that article (I don't have time to read the whole thing, I'm at work right now)
It clearly states :
Short Rod is slower at BDC range and faster at TDC range,
A long rod will help peak power (therefore a shorter rod will help low end power)
Thus, at any given "time" on the power stroke between a rod to crank pin angle of 10o and ie. 90-o, the short rod will generate a greater force on the crank pin (more force = more torque)

Which roughly translates too lower rod stroke = more torque. An LsVtec will rape sleeved B16 (with 1800 cc displacement) with 1.75 rod stroke in a drag race (all things else being equal)
In a road race where reliability is concerned a 1.75 would be a better option, but at the same RPM the one with the lower rod stroke will have a greater piston speed and make more torque which translates into more power.

 

If compare a 86mm b16 and a Ls/VTEC, your saying the Ls/VTEC will beat out the b16 because it has longer stroke, correct? Even though the two have almost the same displacement. So what if I put Ls internals in the bored b16? Do I have myself a winner?

 

the reason an LSVTEC setup may beat a B16 setup in a race would be due to the fact that the LS 1.54 R/S ratio makes power/torque down low in the rpm. unlike the B16A's 1.74 ratio, which yields that nice top end power but hardly any torque especially down low. for reliability and high reving power, the B16 is the way to go.
but the 1.54-1.58 B18 R/S ratio isn't so bad for a street motor, or a motor that isn't seeing really high rpm every day. there are ways to help the B16 accelerate quicker to keep up with the B18's. one is to use closer tranny gears to keep it in it's powerband where it makes that power. and of course another way is would be overboring to 84+mm and/or using a B17 crank and rod setup. but the B17 crank and rod setup would no longer yield that nice 1.74 ratio. but it would still be a bit better than the GSR or LS ratio at about 1.61. also keep in mind that going with 85-86mm bore will not be very reliable over time to use on the street. stick with 83-84mm bore size, or use the B17 crank/rods with 81.5mm bore on stock sleeves.