importlegions

i kno the bottem end of a b20 has a max rev up to 7500, and when u do a crvtec either dohc vtec head redlines way higher at like 82-8500, and norm to build a b20 right, u need to get better rods n pistons to handle the higher revs, but what if u got ur ecu chipped to redline at 7500, and u got a vtec controller to kick vtec in a lil earlier sence ur vtec is starting earlier? is that a safe solution

JDMFreak

wow 7500 is kinda high for stock bottom, basically if your planning on changing out on the head, you will also need to change out the ecu due to VTEC, with the vtec controller you should be able to lower your vtec rpm, but you want to make sure you have enough oil pressure to do so, you dont want to have vtec to kick in to low it might damage it...

importlegions

i meant using the b16 ecu for the vtec to work and gettin it chipped to redline earlier,i forgot about oil pressure, but that can be fixed pretty easy, but is the bottem end safe this way?


Modified by importlegions at 6:00 PM 10/19/2004

j_kevin_ca

hey! gotta a ques. for ya.
do you have a JDM B20 motor?? if u do, how much did you pay for the swap??

JDMFreak

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by j_kevin_ca &raquo;</TD></TR><TR><TD CLASS="quote">hey! gotta a ques. for ya.
do you have a JDM B20 motor?? if u do, how much did you pay for the swap?? </TD></TR></TABLE>

yes i do, it was free becuz i did the swap myself with the help of H-T and a couple of friends

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by importlegions &raquo;</TD></TR><TR><TD CLASS="quote">i meant using the b16 ecu for the vtec to work and gettin it chipped to redline earlier,i forgot about oil pressure, but that can be fixed pretty easy, but is the bottem end safe this way?


Modified by importlegions at 6:00 PM 10/19/2004</TD></TR></TABLE>

ok, here we go, the b20 if a torque monster for a b-series...but the b20 block is not built for high rev, what your planning on doing is just slap a vtec head on a b20 block which is still possible, BUT without upgraded the bottom so it can handle the stress, wear and tear, and high rev the engine will not last that long and it will crack for sure....i highly recommand you contact your local shop or do a search here and go upgraded your bottom as in re-sleeving it and doing it the correct way! and good luck bro!

b20vtecEK

dont rev over 8000 unless you change internals. My b20vtec setup had arp rod bols and acl beaings along with some other stuff in the bottom end and handled 9.5K no sweat. The highset i brought it was 11K and it had NO problem with it. I had a built head mind you.

chad

i rev'd my b20 to 7800.....only problem was valve float.....

i rev'd my b20 STOCK BLOCK vtec to 8800 numberous times....

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b20vtecEK &raquo;</TD></TR><TR><TD CLASS="quote">dont rev over 8000 unless you change internals. My b20vtec setup had arp rod bols and acl beaings along with some other stuff in the bottom end and handled 9.5K no sweat. The highset i brought it was 11K and it had NO problem with it. I had a built head mind you. </TD></TR></TABLE>


k.....
you weren't making power past 9200 so why rev that high??

b20vtecEK

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chad &raquo;</TD></TR><TR><TD CLASS="quote">you weren't making power past 9200 so why rev that high??
</TD></TR></TABLE>

Simply because it is really cool to see your tach go for lap 2 . But it was pullin up and until 9500 so yea.

h22egcivic

my friends reachs 10k rpm's easily with stock bottom end with built ls head.

importlegions

thanks alot man, i thnk imma just get a b16 complete swap for my eg ahtch, then sell it and get a ek and use w/e leftover for building a b20 bottem end so it can handle it, i apreciate ur help tho

Deemeetree

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by h22egcivic &raquo;</TD></TR><TR><TD CLASS="quote">my friends reachs 10k rpm's easily with stock bottom end with built ls head.</TD></TR></TABLE>

I'd love to see how long that B20 block lasts running 10,000 RPM.

JDMFreak

i feel sorry for the b20b/z and b18a/b for who keeps on over-reving them

Deemeetree

If you can clap on a VTEC head and rev to 10,000 RPM, people wouldn't be building them in the 1st place. Every article and person I knew who did a B20/VTEC swap built the block. The block CAN NOT rev past 7,500 RPM without strengthening it. If you want to pass 7,500 RPM, build it.

chad

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dimi &raquo;</TD></TR><TR><TD CLASS="quote"> The block CAN NOT rev past 7,500 RPM without strengthening it. If you want to pass 7,500 RPM, build it.</TD></TR></TABLE>


DO YOU KNOW THIS FOR FACT.....cause i can prove you wrong.....

mine went to 8500 on a daily basis!!!!!!

DON'T post if you have no clue

oh yeah....

my honda challenge engine would see 8700 all day long....on STOCK BLOCK!!!!!!!!!!!!!!!!!!!!!!!!!!!!!and internals!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Conclusion

10,000+ is just plain nasty

Deemeetree

Then why does everyone who wants to rev pat 8,000 build the block?

And I'm not saying it can't be done. But how long will it last beating it on a daily basis?

j_kevin_ca

are you using a B16 tanny??

JDMFreak

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by j_kevin_ca &raquo;</TD></TR><TR><TD CLASS="quote">are you using a B16 tanny??</TD></TR></TABLE>


GSR Tranny got it from Brian Wong, good man

Mackenzie

when you guys say build the bottom end what do you build?

Donkey85

that usually means a better crank,rods, pistons, sleeves and so on

chad

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Donkey85 &raquo;</TD></TR><TR><TD CLASS="quote">that usually means a better crank,rods, pistons, sleeves and so on</TD></TR></TABLE>


95% of the time built means....aftermarket RODS AND PISTONS ONLY
4.9% of the time the owner means the above plus he/she sleeved the block
.1% of the time they put a new crank/stroker crank in

Filliam H. Muffman

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


95% of the time built means....aftermarket RODS AND PISTONS ONLY
4.9% of the time the owner means the above plus he/she sleeved the block
.1% of the time they put a new crank/stroker crank in


</TD></TR></TABLE>

damn accurate statistic. I hope you went door to door and took a poll from all of honda-tech to get that.

chad

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JUN EK9 &raquo;</TD></TR><TR><TD CLASS="quote">

damn accurate statistic. I hope you went door to door and took a poll from all of honda-tech to get that. </TD></TR></TABLE>


yeah well...i work in a shop....this is comprised over my experience of 10 years....would you like to see my statistical data proving this??

chad

you really need to drop that 95% down to 50%....

that other 45% went to dumbasses who really have no clue as to what is done....and are just talking out their ***

dustrag

Well i agree w/ the 7500 comments.. that is where mine goes 2.. i have seen some people w/ stock blocks go well past that for quite some time.. Those are the people that get used to it and then are suprised when it does go up in pieces.. A local shop turboed his crvtec.
stock block and stock b16head reved far to high 9000 + granted it was cool to watch until he changed the oil and then started it up. KABOOM!! and to this day he blames the oil change! LOL