I thought the b18a1 was rated at 130bhp, while the b18b1 was rated at 140bhp?
You are correct, the b18a1 was 130hp between 1990 and 1991, but in 92 the engine went to 140, there was a difference in the cams as well as the changeover from obd0 to obd1
2nd Generation Integra Specifications (USDM Models) 1990-1991 Acura Integra
Courtesy the 1991 OFFICIAL ACURA Sales Brochure
ENGINE AND ELECTRICALEngine Type1.8 L, DOHC, 4-cylinder, 16-valveEngine BlockAluminum alloy with cast-iron cylinder linersHorsepower, SAE net130 hp @ 6000 rpmTorque, SAE net121 lbs.-ft. (16.8 kg-m) @ 5000 rpmInduction SystemProgrammed Fuel Injection (PGM-FI)
1992-1993 Acura Integra
Courtesy the 1993 OFFICIAL ACURA INTEGRA Sales Brochure
ENGINEERING RS-LS-GS GS-R Engine Type 1.8L, DOHC, 4-cyl., 16-valve SystemHP, SAE net 140 hp @ 6300 rpm Torque 126 lbs-ft (17.4 kg-m) @ 5000 rpm Redline 6500 rpm Bore & Stroke 3.19 in x 3.50 in
(81mm x 89mm) Displacement 111.9 cu in (1834 cc)
original question though was the b18b1(usdm) v.s the b18b(jdm) engine
The SAE net hp is set for the usdm models, but JDM engines are NOT SAE TESTED because they are not sold in usdm cars, so horsepower figures can vary slightly due to whoever does the test.
I fully believe that the jdm engine may have a few extra hp, and it could be anything from how the engine was tested to what condition it was in when tested, and the emissions on that engine.
Either way, after all of this, who would pay the 600 bucks+installation for a b18b jdm engine just for 3 hp?