how to tell JDM B20B
- Thread starter d-proff
- Start date
yeah any usdm motor has a number followed after the letter
For instance a b18c is a jdm gsr or type r depending on head code where as a a usdm version is b18c1
But seriously search next time man, this topic has been covered a few times and most recently maybe a month ago if that
i no the number or deal bout usdm lik d15b(jdm) or b18c1(usdm) to b18c(jdm) i no that but i no there is a usdm b20b an b20z n a jdm b20b but go up to the page in the engine code and u will see it i also seen on some other site where they talk about jdm only has b20b and we have the usdm b20b and b20z our b20z has idenical specs to the jdm b20b so i want to be able to tell the differnce where there is stamping on the head or what to where i know if its jdm or not
This is also misleading...The only reason jdm motors put out some more power is because they dont have all the bs emissions crap in them like the usdm motors do. If it wasnt for that the usdm motors would put out more power. My one buddy proved this correct too. He had a jdm gsr and a usdm gsr. He knew a guy at this tuning shop we have here in town and he let him use it cheap, anyway dyno tuned both the same way with the same stuff, cause he too was curious if there was a difference and both put down 170whp when said and done.
So i mean in all honesty all your really buying is a lower mileage motor with maybe most the time a better compression test. So if your dropping in a jdm gsr into a car that still needs to pass emissions and running on an obd2 ecu for that matter it really anit gonna be any quicker then a usdm motor, just the usdm motors are harder to find with true lower miles
I answered your question in my post dude, its not jdm unless no number after letter and you kinda answered it yourself too. And this is a false statement, a lot of people think this but theres no difference in internals
ok>>>you guys see to know about jdm>>>>ok here is the deal im buying a jdm motor with about 50K and acura transmisson with 90k>>>> Ls i think with a flywheel, rsx leather seat from only (2) the body has 120k. it also have headers,intake, exhaust. no dents, it looks relay nice. i gave him my offer which is 3,600>>>it this a good price??????anyone??????????help
^^Thread jacker.
Most of that is true, but u still can run across minor differences here and there. For instance my JDM b16 does have higher compression and different pistons from the usdm b16a2 and b16b ctr. Emissions plays a part but there are also slight changes in the motors as well in some cases
Taken from HT
Let's first start off by saying that ALL USDM motors will have a number after the last letter in it's engine code. The Engine code stamp can be found where the transmission and block mate at the front of the motor. The JDM motors do not have this number after the last letter. For example, a B20B1 is a USDM motor, whereas a B20B is a JDM motor.This is important to understand in determining which motor you have.
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. 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.
Here is a list of the different compression ratios and Power Ratings for B20's, in regards to the year and origin of the motor:
USDM:
96-98 Honda CRV
126 HP, 133 ft/lbs TQ
compression: 8.8:1
99-00 Honda CRV
146 HP, 133 Ft/lbs TQ
compression: 9.6:1
JDM (taken from Japan's Honda website):
96-98 Honda Orthia
143 HP, 132 ft/lbs TQ
9.2:1 compression
96-98 Honda Step Wagon
123 HP,133 ft/lbs TQ
9.2:1 compression
99-00 Honda Step Wagon
134 HP, 136 ft/lbs TQ
9.6:1 compression
96-98 Honda CRV (two variants)
128 HP, 136 ft/lbs TQ
8.8:1 compression
143 HP, 132 ft/lbs TQ
9.2:1 compression
99-00 Honda CRV
148 HP, 136 ft/lbs TQ
9.6:1 compression
96-98 Honda SM-X
128 HP, 135 ft/lbs TQ
8.8:1 compression
99-00 Honda SM-X
138 HP, 137 ft/lbs TQ
9.6:1 compression
These power figures are worthless for you and me, in the sense that these numbers are for these motors in their respective stock vehicles. Take into account that these numbers are with each specific vehicle's stock restrictive header/exhaust, extremely restrictive ECU with it's conservative fuel/ignition tables, restrictive intakes, etc. I've seen multiple B20's dyno in the 125-140 HP range with nothing more than an intake, header, and exhaust, with torque numbers in the 130-140 FT/LBS region. Which is more torque than they are rated at to the flywheel. Based on the factory numbers, these kind of gains shouldn't be made just with an intake and exhaust upgrade. This just goes to show you how underated these motors are from the factory. There is a Rule of thumb that says whp numbers should be about 15-20% lower than flywheel rated horsepower. By using that formula, High compression B20 motors should be rated closer to 160 Hp and low compression B20 motors should be rated closer to 145 horsepower.
BEWARE!! Do NOT let engine importers fool you. Many of them knowingly try to sell you a "JDM" B20B and tell you that ALL JDM B20B's are high compression. As many of you have just learned, this is not true. They tell you this because demand for the low compression motors is alot less than the higher compression B20's. Possibly, many importers just don't know the difference. But don't take that chance. The only REAL way to tell is if the motor has a knock sensor. Also if it is a USDM "B20Z", it is no doubt the 9.6:1 compression motor. So, it may be safer just to find a "B20Z".
Let's first start off by saying that ALL USDM motors will have a number after the last letter in it's engine code. The Engine code stamp can be found where the transmission and block mate at the front of the motor. The JDM motors do not have this number after the last letter. For example, a B20B1 is a USDM motor, whereas a B20B is a JDM motor.This is important to understand in determining which motor you have.
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. 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.
Here is a list of the different compression ratios and Power Ratings for B20's, in regards to the year and origin of the motor:
USDM:
96-98 Honda CRV
126 HP, 133 ft/lbs TQ
compression: 8.8:1
99-00 Honda CRV
146 HP, 133 Ft/lbs TQ
compression: 9.6:1
JDM (taken from Japan's Honda website):
96-98 Honda Orthia
143 HP, 132 ft/lbs TQ
9.2:1 compression
96-98 Honda Step Wagon
123 HP,133 ft/lbs TQ
9.2:1 compression
99-00 Honda Step Wagon
134 HP, 136 ft/lbs TQ
9.6:1 compression
96-98 Honda CRV (two variants)
128 HP, 136 ft/lbs TQ
8.8:1 compression
143 HP, 132 ft/lbs TQ
9.2:1 compression
99-00 Honda CRV
148 HP, 136 ft/lbs TQ
9.6:1 compression
96-98 Honda SM-X
128 HP, 135 ft/lbs TQ
8.8:1 compression
99-00 Honda SM-X
138 HP, 137 ft/lbs TQ
9.6:1 compression
These power figures are worthless for you and me, in the sense that these numbers are for these motors in their respective stock vehicles. Take into account that these numbers are with each specific vehicle's stock restrictive header/exhaust, extremely restrictive ECU with it's conservative fuel/ignition tables, restrictive intakes, etc. I've seen multiple B20's dyno in the 125-140 HP range with nothing more than an intake, header, and exhaust, with torque numbers in the 130-140 FT/LBS region. Which is more torque than they are rated at to the flywheel. Based on the factory numbers, these kind of gains shouldn't be made just with an intake and exhaust upgrade. This just goes to show you how underated these motors are from the factory. There is a Rule of thumb that says whp numbers should be about 15-20% lower than flywheel rated horsepower. By using that formula, High compression B20 motors should be rated closer to 160 Hp and low compression B20 motors should be rated closer to 145 horsepower.
BEWARE!! Do NOT let engine importers fool you. Many of them knowingly try to sell you a "JDM" B20B and tell you that ALL JDM B20B's are high compression. As many of you have just learned, this is not true. They tell you this because demand for the low compression motors is alot less than the higher compression B20's. Possibly, many importers just don't know the difference. But don't take that chance. The only REAL way to tell is if the motor has a knock sensor. Also if it is a USDM "B20Z", it is no doubt the 9.6:1 compression motor. So, it may be safer just to find a "B20Z".
this thread is too jdm for me
lolz