im currently building a b20V with 11.5:1 comp. I plan to rev up to 9K maybe 9.5K, depending on how my numbers look. Will the stock sleeves in the B20 be able to handle this pressure. I did some searches and everyone says 8500 should be around the limit...what you guys think? Should i not rev this how, im in the process of putting the motor together, i dont want to sleeve it...is this safe ? thanks

 

What Cams will you be running? Those sleeves are not made to rev that high, 8200 RPMs should me the max. A girdle and block guard will sure help but still, 9000+ RPMs is a time bomb with stock sleeves.

 

just my 2 cents but we have had great luck doing 11.5:1 compression with a block guard and reving to 9k

 

Dont forget ARP Rod Bolts!

 

A good gridle will help out alot but i still wouldn't go above 8600 RPM's..

 

have cracked 2 b20 blocks in last month....one had block guard the other one didn't.....

both high 12 to low 13 to one compression...

 

running skunk2s2 cams...planned to rev to 9k...i dont want to use a block gaurd since it will only help so much, while limiting my cooling system. ARP is already planned...thx

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Supah_Eg6 &raquo;</TD></TR><TR><TD CLASS="quote">running skunk2s2 cams...planned to rev to 9k...i dont want to use a block gaurd since it will only help so much, while limiting my cooling system. ARP is already planned...thx</TD></TR></TABLE>

If you dont want to use a block guard try this! I know a few ppl that have done it and it works, however in all honestly as far as a B20 goes sleeve it!


http://www.homemadeturbo.com/t....html

You can get this kit from Endyne!

 

If using stock B20B/Z Crv block, I suggest trying posting the block, use a girdle, balance the reciprocating assembly & use no greater than 84.5mm bore if you plan rev. past +9000rpm & high cr.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jwaked &raquo;</TD></TR><TR><TD CLASS="quote">What Cams will you be running? Those sleeves are not made to rev that high, 8200 RPMs should me the max. A girdle and block guard will sure help but still, 9000+ RPMs is a time bomb with stock sleeves.</TD></TR></TABLE>

Can someone explain the science of this?

 

The thing about B20 blocks and their sleeves is the fact that it is a two layer sleeve. Some blocks have irregularities in the depth between these sleeves on the top of the block. Under a load such as 9 grand, they distort and you get flexing at the headgasket which everyone knows is bad. When they distort, they crack and then...BOOM! Thats why everyone suggest installing a blockguard or "posting" the block. "Posting" can be a very good alternative to block guards, but if not done correctly, well, your block is toast. So, be careful or let someone who knows what they're doing handle that for you.

Here is a link that will answer alot of questions. And, yes some of you may have seen this already but not everyone has, hence, this thread.

http://www.theoldone.com/articles/badtothebone/

 

I was really sketch about my set up because all i heard on this board was sleeve this and sleeve that but as far as experience goes i have a 12.5 b20vtec that has ran fine just as long as you keep your set up tuned-- run the right timing and gas.

I don't know aboout 9 grand though, i wouldn't take mine that high...
...but i didn't build it that way

as far as advice goes believe only the people that have ran the set-up personally none of this my friend's mom's dog groomer's cousin's neighbor B.S.

good luck keep us posted

 

My last motor was a turbo b20/vtec that I ran to 8 grand. I bought the block with a guard already installed so that was out of the way. The motor before that one was a b20/vtec that was spun to 8700 on some skunk stg 2s and a cr of 11.9:1 w/ Wiseco pistons. The power curve slammed in to the redline, but that block didn't have any reinforcing and was driven almost every day. the biggest thing to watch out for when buying a b20b/z is those sleeves. Always have the sleeves checked with a depth gauge.

But just to be safe especially when taking it past 8 grand and adding boost, get it reinforced. My two cents. Good luck.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nathan atwell &raquo;</TD></TR><TR><TD CLASS="quote">The thing about B20 blocks and their sleeves is the fact that it is a two layer sleeve. Some blocks have irregularities in the depth between these sleeves on the top of the block. Under a load such as 9 grand, they distort and you get flexing at the headgasket which everyone knows is bad. When they distort, they crack and then...BOOM! Thats why everyone suggest installing a blockguard or "posting" the block. "Posting" can be a very good alternative to block guards, but if not done correctly, well, your block is toast. So, be careful or let someone who knows what they're doing handle that for you.

Here is a link that will answer alot of questions. And, yes some of you may have seen this already but not everyone has, hence, this thread.

http://www.theoldone.com/articles/badtothebone/</TD></TR></TABLE>

Good Info!

 

I think good tuning and respect for an engine will keep most problems out of sight. You know what your motor can do and where it makes power. There is no reason to take a motor past 9k if it isn't making any power that high. Be smart. I have driven my b20vtec for more than a year and drag and road raced it with no problems. All the engine work was done at Hook Ups Import Tek. Talk to Chris, he can school you on B20vtecs. He does a lot of them!

 

like everyone has said, if your not making power that high then there is no point, on the other hand if you will be, i would definitly get it sleeved for just the piece of mind. it makes no sense to spend all that money to build a nice motor just to have it blow up because you cut a corner.

 

thanks for the info, im currently running a b20V right now but its stock. I only take it to 8200 rpm. Since im going with Skunk2s2 cams and higher comp. on my next motor, i wanted to rev to 9k. I might end up posting the block like you guys said because i dont have the extra grand for sleeves...

Did any of you guys with the block gaurds have overheating problems? What kind of cooling system did you guys have? Thanks for the info everyone...!!!

 

I have built 3 B20 Vtec's, all with 12.5:1 comp. Two using GSR heads and one with a B16. All have stage 3 cams, and rev to 8900. I used Eagle rods with CP pistons, and block guards. All 3 are driven daily, and tuned with just a APEXi VAFC. I have never had any cooling problems. The oldest motor will turn a year old this November. No problems. Also all 3 are stock sleeves. It is good to get them sleeved, but $1000 a piece for a block is out of the question!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Supah_Eg6 &raquo;</TD></TR><TR><TD CLASS="quote">thanks for the info, im currently running a b20V right now but its stock. I only take it to 8200 rpm. Since im going with Skunk2s2 cams and higher comp. on my next motor, i wanted to rev to 9k. I might end up posting the block like you guys said because i dont have the extra grand for sleeves...</TD></TR></TABLE>

Be very careful when posting a block. You need the post on the side of the engine that the piston pushes against. Here is another link on "block posting." And you can see what i'm talking about sleeves. http://www.homemadeturbo.com/t....html

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Supah_Eg6 &raquo;</TD></TR><TR><TD CLASS="quote">Did any of you guys with the block gaurds have overheating problems? What kind of cooling system did you guys have? Thanks for the info everyone...!!!</TD></TR></TABLE>

I've only heard rumors of the old STR guards having these problems, but if you talk to EARL, i'm sure he can point you in the right direction if you want to go that route. Just search his name.

 

ok thanks for all the helpful information...i think ill post my block if i cant find a good price block gaurd with good coolant flow..thanks

So no one has overheated due to adding block guards to the engine? is it only a rumor?

 

I think the rumor was started way back when people first starting using block guards. I know the STR guards didn't have the right spacing on some of the holes, so. Not entirely sure, though. Just like when people started saying that adding pulleys would throw off your engine and eventually blow it, that rumor came from the time when Unorthodox Pulleys were unbalanced and yeah, they did cause some havoc on some pro motors. Like I said, its only a rumor to me. Anyway, most quality block guards you'll find in the aftermarket, today, would be a good piece considering, that most rumors have some merit. Well, good luck with your build. And Earl can really help you if you get stuck on something.

 

thx for the info but earl only has the STR block guards...i didnt see a pic of the guard so i cant tell about the coolant flow...thx

 

I'm sure that if STR had problems they fixed them. And I can't see Earl selling something that doens't work. See if AEBS still has block guards.

 

yea i will do some research on them. Lets just say it can be bad products with out the actual distributor knowing it. Like how the "NEW" style STR cams came out with faulty washers on the nuts. The company replaced the defected ones and developed new ones, but the bad products still got out to the market.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mf RENO &raquo;</TD></TR><TR><TD CLASS="quote">I was really sketch about my set up because all i heard on this board was sleeve this and sleeve that but as far as experience goes i have a 12.5 b20vtec that has ran fine just as long as you keep your set up tuned-- run the right timing and gas.

I don't know aboout 9 grand though, i wouldn't take mine that high...
...but i didn't build it that way

as far as advice goes believe only the people that have ran the set-up personally none of this my friend's mom's dog groomer's cousin's neighbor B.S.

good luck keep us posted </TD></TR></TABLE>


I couldnt agree more


The majority of the issues regarding B20 sleeves was with boosted b20vtecs or b20's where cylinder wall pressure was a lot greater than any all motor setup.


Lots of B18C and B18B motors crack sleeves also.

Just keep things in perspective

&lt;--- who has built his fair share of b20vtecs w/ no problems from 10:1 to 12.3:1 compression on crappy 91 octane California gas