Does a b20 have the same pistons as a b20z and the head is different or does the b20z have domed pistons, or both? Would putting a b18b head on a b20b block make a b20z2? Or do you have to increase the compression more?
You're right about the pistons but i found out the b20z has the same cams as the b18b, but the cylinder compression between the b20b(us) and the b20z is the exact same! I don't get it. Its gotta be all in the cams! I want to know because i want to turbo a b20 but the b18 takes turbocharging way better and i want to find out why.
You're right about the pistons but i found out the b20z has the same cams as the b18b, but the cylinder compression between the b20b(us) and the b20z is the exact same! I don't get it. Its gotta be all in the cams!
nah I'm pretty sure it's the pistons that are responsible for the compression difference. Cams don't affect compression anyway.
__________________
uɐsnɹnƃgurusan
Teal Civic Sold: 08/31/2006 FOLD FOR SHO! TEAM 54075 folding@home
nah I'm pretty sure it's the pistons that are responsible for the compression difference. Cams don't affect compression anyway.
NOOOOO you're lying!!! I can't find that FLIPPING engine anywhere. And actually i don't feel like swapping engines or changing the pistons. HOWEVER i do think putting the b18b head on my b20 will make for a nice turbocharged
NOOOOO you're lying!!! I can't find that FLIPPING engine anywhere. And actually i don't feel like swapping engines or changing the pistons. HOWEVER i do think putting the b18b head on my b20 will make for a nice turbocharged
Don't know if this will help you but here is what I found.
B20B
Found in: Honda CR-V, Honda Orthia
Displacement: 1973
Power: 126hp @ 5500rpm
Torque: 133 ft @ 4200 rpm
Compression: 8.8:1
Bore: 84 mm
Stroke: 89 mm
Redline: 6300 rpm red line
B20Z
NON-VTEC
Found in: 1999-2001 Honda CR-V
Displacement: 1974
Power: 146 hp @ 5500 rpm
Torque: 133@ 4500 rpm
Compression: 9.6:1
Bore: 84 mm
Stroke: 89 mm
Redline: 6700 rpm
Mods: All stock, for now. Hooked up the stereo though.
To start things off, the B18B and B20 (B and Z) have IDENTICAL heads. There are NO differences at all. The only head that is different is the ultra rare JDM P8R head, with slightly larger ports. Putting a B18B head on a B20 block will only be a waste of time. The castings are exactly the same.
Secondly, the thing that makes the compression higher in the B20Z is the pistons. The Z has domed pistons, and the B has flat pistons. The problem here is identifying which motor is which. This task is easily done if the motor is USDM. A USDM B20Z is marked as such: B20Z. However, the JDM B20 motors are all marked B20B, whether higher compression or lower compression. The only reliable way to check which motor is which, is to look on the back of the block. The higher compression B20B will have a knock sensor on the back, while the lower compression motor will not. The higher compression motor is from 1999+, so if you know what year your motor is for sure, that is an easy way to tell. 1996-1998 = B20B, 1999+ = B20Z.
Finally, I saw someone talked about boosting a B20. Id reccommend otherwise. Had you researched, you would know that the B20 is essentially a bored out B18B, with some minor differences. This means that, because it has been bored from 81 to 84mm, it has cylinder walls that are 3mm thinner than a B18B. This makes the cylinder walls much weaker, and under boost- they will crack. Ive seen B20's boosted before, and make great power- but Im willing to bet they didnt last longer than 20k miles. If you absolutly want to boost a B20, have it sleeved- or run around 6psi or less on it. Like I said, the B18B head is the same as the B20, so swapping it will make boosting it no better or worse.
Oh, and you will want to swap out the stock B20 intake manifold for a B18B one. These ARE different, and the B20 one is crap. Toss it in the garbage.
Mods: Audio: Kenwood speakers, Music Keg, and reciever, 2 10" subs, and two amps; Engine: Comptech Ice Box cold air intake. More to come soon...
b20b and b20z have completely different intake manifolds as well. Not that it matters cause like said above, swaping either out would be for the better.
Mods: All stock, for now. Hooked up the stereo though.
Quote:
Originally Posted by Slade
b20b and b20z have completely different intake manifolds as well. Not that it matters cause like said above, swaping either out would be for the better.
I was going to mention this, but I wasnt 100% sure. Correct me if im wrong: The B20Z has the taller "giraffe" style intake manifold, and the B20B has the lower one, correct?
I was going to mention this, but I wasnt 100% sure. Correct me if im wrong: The B20Z has the taller "giraffe" style intake manifold, and the B20B has the lower one, correct?
that is correct. in the olden days we called that a tunnel ram intake manifold. It produces more torque than a short runner manifold. Also, from what I understand, the B18 manifold on a b20 will increase power in the upper rpm range while reducing a little in the lower rpm range
Mods: All stock, for now. Hooked up the stereo though.
Ive heard that the B18 intake manifold is superior in every way to the B20 one, simply because it flows so much better. While the B20 one does have longer runners, its innefficient flow characteristics make it inferior to the LS. Just what ive heard.
Ive heard that the B18 intake manifold is superior in every way to the B20 one, simply because it flows so much better. While the B20 one does have longer runners, its innefficient flow characteristics make it inferior to the LS. Just what ive heard.
The b20b has the long intake runners for low rpm torque
the b20z has shorter ones with a little box on top i forget what its called anyways its for midrange torque. Someone posted dyno tests showing all the differences with b20 b18 and b20z. He switched intake manifolds and the b18 intake manifold is much better. ALSO the cams on a b18 and a b20z (not the b20b) are the same. I guess its for higher peak torque.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
Pretty much identical to the b20b.
Linear Mode
