im aboutt to build my b20 vtec and i already searched about this but how much horsepower can a b20 vtec hold?? thanks.

 

40

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ekVtecPower &raquo;</TD></TR><TR><TD CLASS="quote">im aboutt to build my b20 vtec and i already searched about this but how much horsepower can a b20 vtec hold?? thanks.</TD></TR></TABLE>
Depends on how strong its arms are and how heavy the horsepower is. Japanese horsepower weighs more than USDM horsepower. How much can your B20/VTEC bench press?

 

well i havent built it yet so i dunno, i was thinking about a b20b block with a b16a head and a b16a transmission.. do u think i should just go GSR? thanks

 

anyone?

 

WOW, this has to be a troll??

Anyways the B20 has an 89mm stroke, so its a larger stroke than a GSR. The cylinder walls are very thin and there is no girdle, so the block isn't as strong as a GSR. For NA it should be fine, don't take it to much past the stock redline unless you use some forges internals. Goodluck

+1

 

im planning on getting some better sleeves on the b20, and some high compression pistons.

 

I'm shooting for 250whp out of my stock sleeve crvtec.

eagle 4340 knife edged crank
eagle ls/b20 rods
custom Wiseco 12:1 pistons
custom ground crower cams
planning to take mine to about 9300
either going to use a block guard or just post the block.
havn't decided if i'm going to put a girdle on it or just stick with the arp mains.
You know b16's handle over 9k w/ no girldle

sleeves are ok as long as you have a good tuner and don't detonate as that is what usually kills b20 blocks.

Check the All motor section as there are some over 260whp

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drift4jesus &raquo;</TD></TR><TR><TD CLASS="quote">
You know b16's handle over 9k w/ no girldle
</TD></TR></TABLE>
Yeah, but B16s also have a 77.4mm stroke, not 89mm. Honda felt a girdle was necessary for an 81.4mm stroke . . .

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Targa250R &raquo;</TD></TR><TR><TD CLASS="quote">
Yeah, but B16s also have a 77.4mm stroke, not 89mm. Honda felt a girdle was necessary for an 81.4mm stroke . . .</TD></TR></TABLE>

Brilliant.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drift4jesus &raquo;</TD></TR><TR><TD CLASS="quote">
You know b16's handle over 9k w/ no girldle
</TD></TR></TABLE>

Rod stroke ratio ownes you. Also b16 blocks have more webbing and reinforcement than a b20/LS block.

 

so u guys think b20vtec is a good idea ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MotorMouth &raquo;</TD></TR><TR><TD CLASS="quote">WOW, this has to be a troll??

Anyways the B20 has an 89mm stroke, so its a larger stroke than a GSR. The cylinder walls are very thin and there is no girdle, so the block isn't as strong as a GSR. For NA it should be fine, don't take it to much past the stock redline unless you use some forges internals. Goodluck

+1 </TD></TR></TABLE>

when you say stock redline, do you mean a b16 stock redline or a b20 stock redline

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jerbear! &raquo;</TD></TR><TR><TD CLASS="quote">

when you say stock redline, do you mean a b16 stock redline or a b20 stock redline</TD></TR></TABLE>

b20. redline is one of those things that fall under "your only as strong as your weakest link". when you want to inrease your redline you have to ask yourself;

"can my valvetrain handle it?" -check
"can my bottom end handle it?" -check
"will i even make anymore power?" -check
all 3 good to go? raise it to heaven if you so desire.

if your valvetrain can't handle it, SOMETHING will pop. if your bottom end can't, you'll most likely spin a bearing or bend a rod, or even put a crack in your sleeve(s). and lastly, stock redlines are there for a reason. LS's can handle more than 6.5k (or whatever it is) but honestly, the stock cams do not make anymore power above that.


to the thread starter: b20 sleeves are typically weak. if you plan to build it, step one are sleeves, and if your gonna drop the money for the build i would suggest a turbo setup rather than an all-motor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MotorMouth &raquo;</TD></TR><TR><TD CLASS="quote">Brilliant.

Rod stroke ratio ownes you. Also b16 blocks have more webbing and reinforcement than a b20/LS block.</TD></TR></TABLE>

How's this for your ownage... no main girdle what!?! STOCK SLEEVE just a block guard
9k rpm hmmm.
https://honda-tech.com/zerothread?id=1607086
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Targa250R &raquo;</TD></TR><TR><TD CLASS="quote">Yeah, but B16s also have a 77.4mm stroke, not 89mm. Honda felt a girdle was necessary for an 81.4mm stroke . . .</TD></TR></TABLE>
Which motor is it that honda built that has a 81.4mm stroke? I havn't heard of it. Are you referring to the 87.2mm stroke of the GSR/ITR motors?

R/S ratio is over rated when referring to bseries engines. With custom pistons you can use gsr length rods on an 89mm stroke and still have a nice Rod stroke ratio.

You need to go look at http://www.theoldone.com and check his b20 build where he takes a stock sleeve b20 to 10,200rpm.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drift4jesus &raquo;</TD></TR><TR><TD CLASS="quote">Which motor is it that honda built that has a 81.4mm stroke? I havn't heard of it. Are you referring to the 87.2mm stroke of the GSR/ITR motors?</TD></TR></TABLE>
Yes, I intended to write 87.2mm in reference to the B18C, but mistakenly put the 81.4mm spec from the B17A1, which did not have a girdle. My mistake. Thanks for pointing it out.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">You need to go look at http://www.theoldone.com and check his b20 build where he takes a stock sleeve b20 to 10,200rpm.</TD></TR></TABLE>
Yeah. It also blew up when the rods stretched and the pistons contacted the head.

Of note from that site:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Endyn &raquo;</TD></TR><TR><TD CLASS="quote">The cylinder casting that Honda uses in these B20’s is extremely brittle when compared to more resilient “round” individual bore liners. This is simply the nature of a casting such as this where sectional thickness varies so significantly. These cylinders are easily cracked if there’s just a hint of detonation and all it takes to break one of the blocks with the small casting flaws is about 220 HP, so they can certainly be a liability.</TD></TR></TABLE>

 

I'm not argueing that the b16 or b18c is not a better design. the b20 is bigger and w/ the same mods you would put into a smaller engine you can get way more power out of an engine that is 5% bigger.

build it right and a b20vtec is a great engine combo (just like anything else that you build well) its just the fact that its bigger.

You put cams that peak out before 9k that will provide a flat torque curve and you will have a faster set up than you would if you built something smaller.

In the world of going fast its about average horsepower in the usable powerband, not how high it peaks at.