hydroman

HELLP! i just purchased a jdm b20b , i asked for a 1999 motor because they have more horsepower then the 98 n down. when i popped my hood i look at the year code and it says 98.

people have told me its because the jdm motors were built 1 year prior but how do i really know if i have the 126hp b20 or the 146hp b20?

31dev31

What's the whole engine serial number? We may be able to help you identify it.

Cynikal.Mindset

Next, there weren't any B20Z's in Japan. All the JDM B20's were stamped B20B, regardless of the year. You can tell the year of the motor by checking the year/month the head was cast in. The year is located just above the fourth exhaust runner. It is in a circle with a slash through it. Disregard the slash as it means nothing. For example a circle with a 9/8 is a motor that was made in 1998. Be careful though, as this is not a 100% accurate based solely on the year. You must also look at the month it was made. Again, it is right next to the year and will have the month in a circle with a slash through it. Just like the year, if it says 1/1, that means it was made in november, the eleventh month. This is a general rule on all honda motors, but the month is not always there. Now, i'll show you why the year is not 100% accurate. If a motor was made in 98, but was made in november or december of that year, it is actually a 99 motor. That is because they start making the motors early for the next years vehicles. If the head was made in september/october though, that is a tossup as it may either be the year cast on the head, or the next year, because that is the crossover where they stop making the current years vehicles and start producing the next year's vehicles.

Believe it or not, almost all B20's, regardless of year, come with the 96+ Integra LS P75 head. They are 99% identical. They have the same valves, springs, valve covers, distributors, cam gears, etc. as 96+ USDM/JDM P75 Integra LS heads. The only differences are w/ the variances in camshafts. There is one exception however. The B20 motor was equipped in MANY vehicles in Japan, mainly the SM-X, Step Wagon, CRV, and Orthia. Of the many B20 powered vehicles, three of them came with the P8R head, and only in certain model years. The Orthia, which came out in 1996 was one. The other was the Step Wagon. The orthia came with the P8R head in it's 96-98 model years and the step wagon came with the P8R equipped B20B in it's 96-98 model years. The CRV also came with either the P8R head or P75 head in it's 96-98 model years. The P8R head is a completely different casting than P75 heads which were used on all other B20's. This head came with 84mm combustion chambers and 33mm vtec sized intake valves.



All 99-00 B20's have a knock sensor, regardless of where it comes from, which signifies the high compression 9.6:1 motor. If your B20 does NOT have a knock sensor, it is not the 9.6:1 compression motor. High compression B20's use "PHK" pistons which have a less of a dish them, as the "P3f" pistons found in the low compression B20's do. All B20's have an 84mm Bore and an 89mm stroke regardless of year. They are internally and externally identical to 96+ B18B's, with the exception of the Pistons, sleeves, and in some cases, the intake manifold and cams. They all have an 81mm combustion chamber diameter as well, except for the "P8R" head, which has an 84mm diameter and larger valves, as described above.

Cynikal.Mindset

^^copied from some website

MPR

So...if the OP's b20 has a knock sensor, it's the motor he wanted...and if not....he got jipped....correct?

Cynikal.Mindset

correct

F8i

iTrader: (10)

I believe if he has a long airbox it's the motor he wanted, and a short airbox is the low compression B20B.

hydroman

on my motor it came with the short intake manifold instad of the longer one and where can i find this knock sensor when i pop my hood?

MPR

uh...google "b20 knock sensor location"

Ta-da! lol

bbarbulo

iTrader: (2)

or it could simply be under the intake manifold, just above the oil filter.

chiutc

Good info....