B20 Stroker?

[dtmamg]

Anybody ever built a B20 stroker? I'm looking to get a new car soon, and up until recently I was going to get something like a 5.0 liter Mustang or a LT1/LS1 F-body. Due to insurance reasons, however, there's no way I'd be able to keep either of these on the road (just got 2 tickets for Unsafe Start/Improper U-turn doing donuts in a friends 328i). So now I'm looking to get a Civic hatchback, probably an Hx or Cx (doesn't get much cheaper to insure than that) and dropping in a fully built naturally aspirated B series. Just wanted to know if anyone had ever stroked a B20 and what rod length did you use as well as where did you get the crank/rods for it? I'm also considering throwing a VTEC head on it while I'm building it.

[mastarolla]

A B20 block is pretty much a stroked version of the B18. I think its just a larger bore or something like that which nets the extra .2 liter.

If you want a quick motor...build a turbo B20 with like a b16 or GSR head. Just dont rev it too high.

[dtmamg]

Stroking a motor involves using a shorter rod length and increasing the length of the crankshaft throws so that the piston travels farther, increasing the displacement. I realize that to have a larger displacement on a B-series (2.0 vs. 1.8), the cylinder bore would have to be larger, but I'm looking to see if anyone has stroked a B20. I was thinking about going with a turbocharged setup for a while, but I've decided to stay naturally aspirated for now for simplicity.

[mastarolla]

ive never heard of anyone stroking a 2.0 and im not sure how the all motor b20 performs. Lots of torque...

[dtmamg]

Yeah, basically what I'm looking to build is a B-series to drop in a Civic hatchback that'll put well over 200 ft-lbs to wheels throughout much of the powerband, naturally aspirated on 93 octane gas. It might take a lot more time and effort than going with a supercharger or a turbocharger, but thats not what I'm looking to do.

[mastarolla]

yea naturally aspirated is more challenging in my opinion than just bolting on a turbo and goin...i think its a lot more fun too.

[dtmamg]

Yeah, I've seen some kits that have it end up with like a 2.2 liter displacement, which is pretty sick and most likely makes a lot of torque.

[mellowboy]

Thats a good question actually. I dont know if they have kits for it but i think you can get 84.5 mm sleeves which makes it a 2.2.

[disbboi]

crower makes 2.2 liter stroker kit. the last time i checked i think its a little over $2000. i've seen stroked b16 to 1.8 liter and it ran great, but i don't know about a 2.2 liter tho.

[whtteg]

The stroker kit for the b18b1 will work in the b20,all you need is larger pistons b/c the bore in the b20 is bigger than the b18b1. The two motors are the same, the b20 is a b18b1 with a bigger bore. The two motors use the same crank and rods.

[dtmamg]

Thanks for the info. You don't happen to know what results people have seen from the Crower B18 stroker kit? Just looking for a general idea of how much power it'd be making.

[mastarolla]

A B20 Vtec build is known for the torque you get...id almost be scared to see what a turbo b20 stroked would do.

Is it the torque youre after because it would probably be cheaper going the H22 route

[whtteg]

Originally posted by dtmamg
Thanks for the info. You don't happen to know what results people have seen from the Crower B18 stroker kit? Just looking for a general idea of how much power it'd be making.

Sorry I have seen no info on results and I don't know of anybody who has it, I think it is b/c the r/s ratio will be even worse than the stock 1.54 , but i dunno. If you can get a hold of a b20 then sleeve it and boost around 20-25psi you would have a monster

[disbboi]

sorry i dont know the results for a 2.2 stroker, but i saw a 2 liter gsr that make 240hp and 173tq at the wheels naturally aspirated, but it was fully built. so imma guessing you should make more for a 2.2 liter. like mastarolla said it would probably be cheaper if you got a h22.

[dtmamg]

Yeah, the main reason I wasn't looking to put a H22 in was because of the increased weight. I wanted to have a car that would still be decent through the turns. Kind of an all-around autocross/drag-strip car.