I'm doing some over the phone research for a buddy doing a swap. The motor is JDM out of a right hand drive, the block code is B18C, no # at the end and the valve cover is black. Wikipedia lists the B18C as a JDM Type-R motor, but I thought Type-Rs had red valve covers. The importer said it was a GSR motor.

The main reason we need to know is to find a doughnut gasket for the header to cat flanges. The Acura dealership has to order it and can't produce a spec on the measurements. Someone measures the I.D. of the manifold flange at 2 1/4", but we don't trust him to run for food let alone measure something. Any help would be appreciated.

 

b18c is a jdm gsr

 

x2

 

its a jdm gsr motor..aka sir-g.

 

Seems like its a sir=gsr. Both the jdm type r and sir=gsr say b18c. so check the IM but most importantly check the head numbers.

 

i believe after 1996 the b18c is a jdm type r engine.

 

every single one of you guys is wrong. b18c is the code for BOTH the ITR and SIR-G. the only way you can tell is with the cylinder head. if it's p72 it's GSR or SIR-G as they call it in japan. ITR is pr3. the intake manifolds are also a giveaway. the black valve cover is typical of sir-g as all itr engines come factory red. the valve cover doesn't much much though. check the head casting and intake manifold.

 

you took the words out my mouth

 

You sir are correct PR3 = ITR, P72 = SIR-G / GSR

 

this guy is right nothing else even matters

 

x1000.

 

you can also tell by the price if buying thru a company. jdm itr swap runs bout $4200+, while jdm gsr/sir-g runs bout $3000 - $3500.

 

he's right! I got a B18C gsr


depends where're getting them, HMO sell for like $1700 for gsr motor (97) 35,xxx-55,xxx miles.

 

wasnt there a term for it SiR is B18C and ITR is B18CR? not talking about the stamp, but thats what people calls it?

 

I thought the head would say p-72 for a gsr and p-73 on a itr head.

 

no, this is just a honda tech rumor that some people started using when they were talking about their engines. quite a few people believe this and i even had one kid ask me why i put a b16 head on a jdm gsr, he was like it says b18c. after a couple minutes of telling that guy it was actually an ITR and showing him why i think he may have caught on. when people say b18cR they are just doing it to brag or clarify about having an itr engine and not the gsr. you literally can not tell the difference on the sir-g and itr bottom ends without seeing the piston

also, ITR's use b16 heads, there is no itr specific head. the b16-itr head has minor port work and a better valve train thus it becomes an itr head. for example mine is stamped pr3-2

 

I understand, But if you look at the bottom of a Gsr head the chamber is different. I was running b20/gsr head. It raises the compression and it's faster to me. but, that;s my opinion. Good to chat with a real HEAD . PEACE A