EdSales

I just got done tearing down a B20B I bought, and am preparing to buy all the parts for the bottom end. I recently came across some people saying that B20Vtec Motor is not good for Road Course Racing, due to the fact that the Sleeves are weak and will crack. I am listing my build below, so you can tell me if the build will be ok for Daily Driving/Road Coursing, and if not, what Sleeves you recommend to go with.


B20B
84.5 or 85MM RS Machine Pistons 11.5
ACL Race Bearings
22T Water Pump
B20B Non-Vtec Head Gasket
Z10 Motorsports Block Girdle
ARP Rod Bolts
B16A Head
ARP Head Studs
Engine Oil Cooler
Z10 Breather Kit
Skunk2 High Comp Valves
Buddy Club Valve Springs
Buddy Club Retainers
Buddy Club Stage 4 Cam Shafts
Buddy Club Cam Gears


Thanks for the info ahead of time

vtec8200

Well it depends how high you plan on revving and the tune. Here at the track there is a guy who has ran 5 years on his b20vtec with ITR head and arp rod bolts. He is there every monday doing about 3-5 20mins sessions revving to 8200-500 rpms. I would personally not have the high comp valves because of the added weight and would balance the bottom end with possibly a block girdle (which you plan on adding). Add to that a safe tune up top and that engine will last, prove em!

GranDaddyPurp

invest in some rods. or get the oem rods shotpeened. also look into getting your crank micropolished and balanced. yes the sleeves are weak but if you keep your b20 well within its limits get it tuned. and also have it balanced i dont see why you cant roadrace with it.

good luck

EdSales

Thanks for the Info. I do plan on Shot Peening and Balancing Bottom End. I didn't know the Skunk2 High Comp Valves were heavier, I will def do some more research on them then.

DDTECH

the sleeves are no weak to where they can't support abuse or power.

they are weak because the b20 is **** to low rpm, high load ign knock/pinging.

Tuning a b20vtec can be tricky, but plenty of na people making 230+whp daily driven, high compression , low compression, alot of boost etc.etc.

DDTECH

What..

vtec8200

What what?
If I'm wrong then please explain.

xzodiackillerx

http://www.youtube.com/watch?v=fbGkxcY7YFU

vtec8200

that's the funniest thing I've seen in a while

DDTECH

High compression valves dont add weight, specially if you use the right valves..
The whole point of upgrading the valvetrain, valves included is to lose weight and add strength..
Stock ls/b20 cranks are some of the strongest cranks honda's ever made.. they can with stand high revs as long as the "weak" links are addressed

Rod bolts are about the "only" weak link all motor wise in the ls/b20's
upgrade rod bolts and slap a gsr head on a b20 or ls block and rev to 8200rpms all day.. if your motor makes power that high

With that said..
I run 13.0CR on pump gas on a stock sleeved b20vtec. - I had some knock problems around 2-3k rpms at high load.. take some timing out and be done - not a problem - ls's dont have this type of low rpm high load problem. non the less .. its not a issue

night

I'd still go for the 84.5 or even stock depending on clearance. longer lasting/bigger margin of error in the long run and room to rebuild if ever necessary.