Questions about VANOS and OBD

postmaster · #1 (**permalink**) 10-23-2002, 05:17 PM

what is VANOS what does it do and what cars have it?

what is the actual difference of OBD1and2 why did they switch to OBD2?

WannaBeeM3 · #2 (**permalink**) 10-23-2002, 05:26 PM

Quote:

Originally posted by postmaster
what is VANOS what does it do and what cars have it?

what is the actual difference of OBD1and2 why did they switch to OBD2?

Vanos came the the 3 series in 1993, it is varible valve timing, like vtec is to hondas Vanos is to bmws. They switched to OBD2 because of emmission issues.

SG_M3 · #3 (**permalink**) 10-23-2002, 05:29 PM

No, vanos is variable valve timing, but nothing like vtec. Vanos alters the timing on the intake cam only. Vanos in the e46, e39, e38, z3 all used the double vanos motors, intake and exhaust

Obd I was phased out due to more strengent emissions requirements, and the fed implemented obd II.

Dinan330ic · #4 (**permalink**) 10-23-2002, 05:47 PM

Doesn't Honda's have like OBD-4 or some really high number?

SG_M3 · #5 (**permalink**) 10-23-2002, 06:03 PM

No all cars have obd II.

Andy W. · #6 (**permalink**) 10-23-2002, 08:12 PM

Quote:

Originally posted by Dinan325ic
Doesn't Honda's have like OBD-4 or some really high number?

no, all production cars 96+ have obd2

WannaBeeM3 · #7 (**permalink**) 10-24-2002, 08:53 AM

Quote:

Originally posted by SG_M3
No, vanos is variable valve timing, but nothing like vtec. Vanos alters the timing on the intake cam only. Vanos in the e46, e39, e38, z3 all used the double vanos motors, intake and exhaust

Obd I was phased out due to more strengent emissions requirements, and the fed implemented obd II.

Actually, not all vtec alters both intake and exhaust, like the eariler vanos, the eariler vtec only alters the intake cam only. I can be wrong, but this is what i've read, and a mechanic that works on hondas told me. So how is vanos nothing like Vtec? they both alter valve timing...

postmaster · #8 (**permalink**) 10-24-2002, 09:28 AM

^BUMP^

SG_M3 · #9 (**permalink**) 10-24-2002, 10:11 AM

Quote:

Originally posted by WannaBeeM3

Actually, not all vtec alters both intake and exhaust, like the eariler vanos, the eariler vtec only alters the intake cam only. I can be wrong, but this is what i've read, and a mechanic that works on hondas told me. So how is vanos nothing like Vtec? they both alter valve timing...

no, vtec isn't about timing. Vtec is basically putting 2 cams on one. There is a less aggressive lobe for low rpm tq and at around 5500rpm, it uses oil pressure to switch the rockers to the more aggressive lobe. Which is more aggressive allowing for more hp and better breathing.

Here is an article about vtec:
http://www.vtec.net/articles/view-ar...rticle_id=7334

Andy W. · #10 (**permalink**) 10-24-2002, 10:15 AM

Quote:

Originally posted by WannaBeeM3

Actually, not all vtec alters both intake and exhaust, like the eariler vanos, the eariler vtec only alters the intake cam only. I can be wrong, but this is what i've read, and a mechanic that works on hondas told me. So how is vanos nothing like Vtec? they both alter valve timing...

and you are wrong...DOHC VTEC changes both intake and exhaust...but its not cam/valve timing like VANOS. VTEC switches to a higher lift/longer duration set of cam lobes at a specific RPM, but the timing remains the same.

postmaster · #11 (**permalink**) 10-24-2002, 11:05 AM

can anybody explain in more detail

WannaBeeM3 · #12 (**permalink**) 10-24-2002, 06:31 PM

Quote:

Originally posted by Andy W.

and you are wrong...DOHC VTEC changes both intake and exhaust...but its not cam/valve timing like VANOS. VTEC switches to a higher lift/longer duration set of cam lobes at a specific RPM, but the timing remains the same.

Oh OK, sorry,didn't mean to get them mixed up.