Civic-EG.com Forum 3.3.1

- Wed Aug 25, 2010 2:16 am #210440 I Ive got a b18c but do not know if its a B18c spec r, or a B18c sir-g. Any ways of finding that out?

Also, what is the difference between a c1 head, c5 head, and the B18C head (from japan)?

- Wed Aug 25, 2010 3:47 am #210452 the manifold will tell you what motor you have. Post a pic.

It will also say on the block B18c something if its an american motor.


the C5 and spec R heads will have pr3 on the casting some where.

1986 Nissan 300zx
1980 Kawasaki KZ650
2014 Kawasaki Ninja 300

- Wed Aug 25, 2010 5:03 pm #210519

It will also say on the block B18c something if its an american motor.

I understand. But It says B18C only. Just want to figure out if its a B18c spec r, or a B18c sir-g

- Wed Aug 25, 2010 5:37 pm #210524 The head says this...


And the block says this...

[suspendedHatch]

- Wed Aug 25, 2010 6:28 pm #210533 I'm pretty sure that's a B18C1 equivalent. If the intake manifold is upside down and has the lever with a dashpot on the FPR side that it's definitely a GSR.

Greasedmonkey will come back and confirm this but I have a GSR and it has P72 stamped on the head just like yours.

btw Greasedmonkey is awesome.

- Wed Aug 25, 2010 6:34 pm #210536 just let me know what type of pictures to take and show you guys so you can tell what type of motor i got

- Wed Aug 25, 2010 11:08 pm #210577 Take a picture of the intake manifold or of the engine bay facing the car if the engine is in the car already.

Hi, I'm John. I'm a hacky sackin', rock climbin', scuba divin', aircraft mechanic.

- Thu Aug 26, 2010 3:19 am #210613

I'm pretty sure that's a B18C1 equivalent. If the intake manifold is upside down and has the lever with a dashpot on the FPR side that it's definitely a GSR.

Greasedmonkey will come back and confirm this but I have a GSR and it has P72 stamped on the head just like yours.

btw Greasedmonkey is awesome.

Im awesome!! Wow, thanks.


Yes, P72 is a gsr head. You have what seems to be a JDM GSR or SiR-G motor.

When and if you order a new intake manifold for this motor, get one for a gsr.

1986 Nissan 300zx
1980 Kawasaki KZ650
2014 Kawasaki Ninja 300

- Thu Aug 26, 2010 3:35 am #210618

Take a picture of the intake manifold or of the engine bay facing the car if the engine is in the car already.

Here yah go. . .

- Thu Aug 26, 2010 3:37 am #210619

I'm pretty sure that's a B18C1 equivalent. If the intake manifold is upside down and has the lever with a dashpot on the FPR side that it's definitely a GSR.

Greasedmonkey will come back and confirm this but I have a GSR and it has P72 stamped on the head just like yours.

btw Greasedmonkey is awesome.

Im awesome!! Wow, thanks.


Yes, P72 is a gsr head. You have what seems to be a JDM GSR or SiR-G motor.

When and if you order a new intake manifold for this motor, get one for a gsr.

Thats what im trying to figure out. If its a jdm gsr, jdm type r, or sir-g. But thanks for the tip on the intake manifold.

- Thu Aug 26, 2010 12:18 pm #210651 Sir-g

600whp Turbo 84mm LS/Vtec Drag Hatch

- Thu Aug 26, 2010 6:56 pm #210702

Sir-g

how can you tell? Like whats a dead give away?

- Thu Aug 26, 2010 9:23 pm #210730 here's a pic of a type r....





the USDM B18C1 (GSR) and JDM B18C (Sir-G) look like their intake manis are on upside down, like the picture you posted


nice swap

600whp Turbo 84mm LS/Vtec Drag Hatch

- Thu Aug 26, 2010 10:31 pm #210737 Sir-g and GSR are the same motors pretty much.

ITR and Spec R are the same.

They just come from different sides of the pond.


You have a JDM B18c motor, which is a Sir-G. If you want to get more parts for it, you will be ordering parts for a USDM GSR motor. Its all the same. The main difference will be the intake manifold. It has to be GSR/Sir-G (p72) head specific.

The ITR and Spec R both use the PR3 casting which is the same as the B16a/B17a head.

1986 Nissan 300zx
1980 Kawasaki KZ650
2014 Kawasaki Ninja 300

- Thu Aug 26, 2010 10:55 pm #210739

here's a pic of a type r....





the USDM B18C1 (GSR) and JDM B18C (Sir-G) look like their intake manis are on upside down, like the picture you posted


nice swap

Gotcha thanks man