Say our building platform is a 95 b18c1
1st. we want more torque so we add a b20 or b18b crank and bore the sleeves to 84mm to create more displacement. Is that right?
2nd. Once we've altered the sleeve size on the bottom end, wouldn't we have to match the size of the head's half of the combustion chamber? Thus, How can a b16 head sit on a b18b, without alterations.

I know these things are possible, but I don't understand why. If you guys would take the time to explain it to me I'd appreciate it.

 

1.Simply bore the GSR Block to 84-84.5mm and use the same crank.
2. Some people open the CC`s to match the bore and some don`t. I did. There was a good 4-5 page discussion about thise in the FI Forum 6 months ago.

Ryan

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtecvoodoo &raquo;</TD></TR><TR><TD CLASS="quote">1.Simply bore the GSR Block to 84-84.5mm and use the same crank.
2. Some people open the CC`s to match the bore and some don`t. I did. There was a good 4-5 page discussion about thise in the FI Forum 6 months ago.

Ryan</TD></TR></TABLE>
If you don't mind me asking, what is your set up? How much power are you putting down?

By not matching the CC to the sleeve bore, doesn't that result in a signifigant loss of power and make the boring pointless?

 

Look, helping me out is deleting one less ignorant guy asking swap questions, and you guys can go back to comparing pistons

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Touch &raquo;</TD></TR><TR><TD CLASS="quote">
If you don't mind me asking, what is your set up? How much power are you putting down?

By not matching the CC to the sleeve bore, doesn't that result in a signifigant loss of power and make the boring pointless? </TD></TR></TABLE>

Completely false.

In fact it can very well raise HP by resulting in a higher static compression ratio than if the CC on the heads were opened up to 84.x mm. However in short, what it can cause is more chance of "hot spots" occuring in the CC resulting in possible detonation. Secondly it is argued that you will achieve a better mixture in the combustion chamber since the air flowing around the valve on the outer edges of the CC will have an easier time filling up the entire cylinder.

Increasing the bore 3-3.5mm will increase the displacement of the engine, and increasing displacement will make more hp. There is however a limit to the rule but up to about 86mm you will make more power.

If you are not boosting and you are going to be sleeving your block, 85mm pistons will be a nice balance.

Lastly, just FYI, all B16's and B18's have 81mm bores. Their displacement is varied by their crankshafts. The compression is varied by pistons & cylinder heads.

 

I thought more displacement made torque, not hp and if that comes from the crank, then why the larger bore?

I know I'm asking a lot of questions, but I really wanna investigate and know what I'm talking about before getting anyone to build a motor

 

More displacement makes more torque and hp. HP and torque are interrelated.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Touch &raquo;</TD></TR><TR><TD CLASS="quote">I thought more displacement made torque, not hp and if that comes from the crank, then why the larger bore?

I know I'm asking a lot of questions, but I really wanna investigate and know what I'm talking about before getting anyone to build a motor</TD></TR></TABLE>

Torque and HP are very much related.

HP is a function of torque. HP is figurative.

If the motor makes more torque, as long as everything induction-wise is efficient enough to provide the motor with enough incoming air and proper outgoing velocities, you will make more HP along with the additional torque.

I suggest doing some searches on "horsepower" to get a better understanding for this all.

 

boring and strokng makes power, but opening up the CC loses compression not good. i dont do it either, as i see it pointless. about the b16 on the b18 block, theyre the same bore 0f 81 and a b16 head is same casting as a type r head.

 

Cheetah has some very good points on spot-facing. To bad I have the worst memory on earth.

 

lately ive been thinking about opening up my combustion chambers but i was thinking more of tapering instead of boring..because i want to decrease the probability of hot spots..

regular bore:
<FONT COLOR="white">-</FONT>_____________
|&lt;&lt;&lt;84mm&gt;&gt;&gt;|

my idea:
<FONT COLOR="white">-</FONT>_____________
/&lt;&lt;&lt;82mm&gt;&gt;&gt;\
&lt;&lt;&lt;&lt;84mm&gt;&gt;&gt;

 

that looks good.