Im going to get a b20z longblock and will slap a b16 head on it with a goldeneagle vtec conversion kit.will get some portflow valve springs and retainers and valves for the head no port.it will have a stock b20z block i mean everything stock except acl bearings and arp head studs no sleeves,and a garret straight t4 turbo so my question his will this block be safe enough to handle some boost and how will the sleeves hold up,remember this block has 9:6:1 compression stock.Also how high can i rev it up to with stock internals in block but with valve springs and retainers and how much boost will be safe for this setup.I will be using hondata s200 and it will be 91 daily driver but will tune it on race gas c16 when i race it.

 

IMO, the turbo is too big for it. You can have more fun with it if the b20 was sleeved. You will not be in the effeciency range of that turbo on low boost. Reasoning being, the sleeves dont like to see more than 280 hp. They're weak. Just get a t3/t04e and run 8 psi on it. You will be happy with the power band on the streets.


BTW, even tho b16 heads rev up to 9000rpm, you will still have to reinforce that bottom end to take it up that high.

 

well i had a b20vtec fullybuilt bored over to 85mm on stock sleeves and it made 241 to the wheels so i want to make atleast a little over 300 with this setup.

 

That's not what he's saying K-Series, he's saying that the powerband and on-off boost response will be crap with that straight T4 turbo. The effiency range for most of those larger ones are in the upper band. Stay a little conservative on size, and you'll like it more later.

 

There is lots of people on this board that have broken the sleeves on b20s - they dont hold up to boost very well and high rpms.

Personally i wouldnt boost that block stock unless i sleeved it.

b20 blocks have a weird sleeve design....this is what happens to them..


liam

 

thanks for the info.

 

im in the same boat as you although im running a B20B and a T3/T4 off of my old setup. i've read numerous stories about weak *** B20 sleeves but i still deided to do it. i plan not to go any higher than 10psi unless im feeling crazy or something or if i somehow come up on some money to sleeve another block.

about another month and the motor will be done.

 

i tak to a really experienced builder and said if i run anythng higher than 110 octane i can boost up to 13 psi safely on stock sleeves.

 

just go the safe route and resleeve the block..so u wont have to run into any trouble in the future. better to be safe then sorry

 

yea true that way i can boost like 24 psi safely.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by K SERIES &raquo;</TD></TR><TR><TD CLASS="quote">i tak to a really experienced builder and said if i run anythng higher than 110 octane i can boost up to 13 psi safely on stock sleeves.</TD></TR></TABLE>

The picture i posted was a b20b with rods and pistons (rollerwaves), stock sleeves, b16a head, revin' to around 8400rpms and 10psi of boost.

Broke while racing at the track.

liam

 

yea but what octane probly on 91 right.

 

I dont think you quite get what they are saying. THose sleeves are week. Period.

 

The reason for the B20 sleeves being weak is the material they are made out of.They are made out of a fiber steel content material making them weak.I too had a b20 block but after reading what the sleeves where made out of I sold it for $400 and bought the ls block for $100.The LS sleeves are made out of plain steel and the LS is proven to have less problems.

 

man if you have a solid running block and you get a good tuner It would be reliable at 10psi and regular gas. race gas Idont know....

 

yes i get it but any stock sleeves are weak unless sleeved its not hard to figure out.

 

Not AS weak as the b20 sleeves.
Look at it this way.
You say with race gas you can run 13psi, but what does race gas + more boost mean? More power for the weak stock b20 sleeves.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by K SERIES &raquo;</TD></TR><TR><TD CLASS="quote">yea but what octane probly on 91 right.</TD></TR></TABLE>

Yeah 91 octane. What does the octane have to do with anything? Its 10psi of boost on a well tuned built motor. The sleeves are weak...and thats that.

I run 20psi daily on 91 octane in my current dohc ZC - and i have zero problems (yay for a sleeved block).

liam

 

alright then i'll just sleeved the block then but if i sleeve the block thenis it better just to get a ls block then and cheaper to right.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by K SERIES &raquo;</TD></TR><TR><TD CLASS="quote">alright then i'll just sleeved the block then but if i sleeve the block thenis it better just to get a ls block then and cheaper to right.</TD></TR></TABLE>

Yep! A b20 is just a ls block with a gsr oil pump and 84mm sleeves. You can sleeve a LS block to the same size.

Personally id sell the block and get a LS and sleeve it - it will save ya money. But either one will work just fine.

liam

 

Running race gas isn't going to do it your're just more prone to blowing a sleeve.

The reason your running race gas to run more power thus more torque = boom.

 

thanks for al the info .