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 Board index » Technical » B Series Engine Chat

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EauRouge
 Post subject: Difference between B18B and B20B cams
PostPosted: Mon Aug 27, 2007 2:47 pm 
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Can anyone confirm the difference between the B18B and B20B cams? I found some specs at BrianCrower.com and I want to know if anyone has experience between the two.

http://www.briancrower.com/makes/honda/b18ab18b.shtml

USDM B18B1 (’92-’00)
274°/278° 183°/184° .393"/.380" 9.98/9.65

USDM B20B (’97-’98)
278°/276° 190°/194° .397"/.382" 10.08/9.70

Thanks,
Dave
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jcushing
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PostPosted: Mon Aug 27, 2007 2:55 pm 
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from what ive seen b20b cams are smaller but b20z cams are bigger so i dunno if i would trust those specs as being correct for those specific years.
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88ls4drking
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PostPosted: Mon Aug 27, 2007 2:59 pm 
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i ran 16.2 with b20b cams.swapped to 90-91 ls cams and went 15.7.

_________________
had to change the game up. sorry.
91 DA teg.
ls bottom/b16a2 head.
pr3 pistons, itr cams.
a.e.b.s intake manifold.
kyb struts, onsoku coils.
cross drilled rotors, ebc pads

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jcushing
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PostPosted: Mon Aug 27, 2007 3:24 pm 
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seriously b20b cams are tiny... b20z cams however are pretty decent for OEM. they are are too small to make power though and should be upgraded asap
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labjunkies
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PostPosted: Mon Aug 27, 2007 6:09 pm 
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the LS B18B cams have the aggressive high end for any non vtec head build, the b20 camshafts produce a lil more torque on the band but we always tell our customers to stay with the B18B camshafts if can.

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4sd4dr
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PostPosted: Tue Aug 28, 2007 4:12 pm 
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When will someone measure the lift/duration of a set of OEM B18A/B18B and B20B/B20Z cams?

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jcushing
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PostPosted: Tue Aug 28, 2007 4:39 pm 
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i measured the lift of b20z and b20b cams, intake only

b20b 8.9mm
b20z 10.0mm (wich matched crowers specs for b18b)

i cant measure duration easily though.
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4sd4dr
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PostPosted: Tue Aug 28, 2007 5:40 pm 
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jcushing wrote:
i measured the lift of b20z and b20b cams, intake only

b20b 8.9mm
b20z 10.0mm (wich matched crowers specs for b18b)

i cant measure duration easily though.


both intake/exhuast were 8.9 and 10.0?

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1990 Integra Sedan - 244.8 fwhp B20VTEC.
1997 Civic LX sedan... stock.
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jcushing
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PostPosted: Tue Aug 28, 2007 8:24 pm 
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i only checked the intake
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allmotorls
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PostPosted: Tue Sep 04, 2007 10:49 am 
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have anybody used b20z cams on there ls i always used b18b cams but the powerband didnt really do it for me
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88ls4drking
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PostPosted: Tue Sep 04, 2007 4:00 pm 
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dont know if you all agree. i have had lots of non vtec B series. from obd0 to obd1 to obd2. they all ran better with 90-93 ls cams. the r1's. the quickest time i had with my b20 was 15.4. dont remember my speed. that was with ls cams. my fastest time with the b 20's was like 16.3. but our track is also shitty here in northeast tenn.

_________________
had to change the game up. sorry.
91 DA teg.
ls bottom/b16a2 head.
pr3 pistons, itr cams.
a.e.b.s intake manifold.
kyb struts, onsoku coils.
cross drilled rotors, ebc pads

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allmotorls
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PostPosted: Tue Sep 04, 2007 9:58 pm 
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da6jdmteg wrote:
dont know if you all agree. i have had lots of non vtec B series. from obd0 to obd1 to obd2. they all ran better with 90-93 ls cams. the r1's. the quickest time i had with my b20 was 15.4. dont remember my speed. that was with ls cams. my fastest time with the b 20's was like 16.3. but our track is also shitty here in northeast tenn.


oh ur from tennessee me too. :D
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JDM_DA9
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PostPosted: Wed Sep 12, 2007 11:28 pm 
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well i got a b20b with a p8R head and the cams say 75 ex and in... that is the b18b LS cams right?
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jcushing
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PostPosted: Thu Sep 13, 2007 6:06 am 
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same casting, NOT the same cam profile
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vwbased
 Post subject:
PostPosted: Sun Dec 02, 2007 11:09 pm 
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I measured the following on my B20B before retiming the cams for reverse rotation:

All measurements were at the valve. Lash was set to 0.007 inch on intake and 0.009 inch on exhaust.

Intake:
Peak lift = 0.332 in (8.43 mm)
IO: 5.0 deg ATDC @ 0.010 in lift
IC: 39.0 deg ABDC @ 0.010 in lift

IO: 19.5 deg ATDC @ 0.050 in lift
IC: 24.0 deg ABDC @ 0.050 in lift
Duration = 184.5 deg @ 0.050 in

LCA = 112 deg ATDC

Exhaust:
Peak lift = 0.356 in (9.04 mm)
EO: 46.0 deg BBDC @ 0.010 in lift
EC: 3.0 deg BTDC @ 0.010 in lift

EO: 31.5 deg BBDC @ 0.050 in lift
EC: 18.0 deg BTDC @ 0.050 in lift
Duration = 193.5 deg @ 0.050 in

LCA 115 deg BTDC

Note that there is NO Exhaust-to-Intake overlap.

Regards,
vwbased
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JDM_DA9
 Post subject:
PostPosted: Thu Dec 06, 2007 12:26 am 
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so they are not the same.... i will try to pick up some b18b cams then....
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 Board index » Technical » B Series Engine Chat

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