I'm still looking for cams for my car, but theres someone selling a used itr head in the forums that comes complete with head,valve cover, intake manifold, cams, cam gears, valve train and all the rest of the good stuff only for 700 dollars. This could save me alot of money if i ended up buying it, but how would my compression ratio be effected? Would anything have the potential of being destroyed doing this?

 

should slap right on, im almost sure your comp will go down slightly.cant remember,theres a whole article and how to on this in the hybrid-hondaperf.org board.

 

CR would be like 9.6 or so.
Bolts on, you would need a new intake manifold as well.

 

yeah the whole package includes the intake manifold too. If i milled the head a little bit and got an aftermarket head gasket, would it be possible to make my compression back up to stock?

 

yeah, the ehad gasket alone would take care of it.

 

The GSR head vs the ITR head is .2:1 compression difference. So with the stock 10.1:1 GSR pistons you will run 9.9:1. If you get a 2 layer head gasket from Spoon or Mugen it'll raise it back up .2:1.

HTH,

 

Stock is 10.0:1

 

10.1:1 for the GSR and 10.6:1 for the ITR. USDM of course.

 

Uhmm, B18C1 =10.0:1 CR

 

yeah, b-18c1=10.0:1 and the JDM version has the same compression as the usdm ITR i believe?

 

usdm b18c = 10.0
jdm b18c = 10.6
usdm b18cR = 10.6
jdm b18cR = 11.1:1

 

don't mill! been there, done that, warped head

isn't slapping a b16 head onto a b18c1 bottom end a good way to turbo?

 

i'm sticking n/a sorry

 

is changing a gsr head to itr worth it? i know it lowers compression but any info would be good

 

well for starters stock gsr head vs stock itr head,

flows better (slight oe port & polish)
better/higher flowing intake manifold desing
better valvesprings
better/hotter cams

if your going to get your head p&p stick w/ the gsr head,it can flow better (i know im going to get flamed for this one)

you can also get a skunk2 manifold + better springs and cams for your gsr head, but if yo can find a complete itr head assembly cheap,its a great add on.

 

-2 points of compression.

 

Come on guys, do the math.
It'll be about 9.6:1.

You're adding 1.1cc to TDC volume. Try the math yourself.

BTW, Benjamin.. milling is not a bad idea. YOU might have had a bad experience with it.. but there's countless people out there who are all for milling.
I've had it on almost every single one of my cars. Main thing is.. it's irreversible.
I do it because aftermarket headgaskets don't usually do to well as far as compression gains.

Mill ITR head 20 thou and do a 1 layer gasket. That's what I'm screamin.

 

I've thought about the B18C5 head on my hybrid as well. Keep the thoughts coming. Do you guys think it would be better to find one complete OR just upgrade my current B18C1 head?

-Todd

 

I think just slapping a b18c5 head/manifold on a b18c swap is not worth it.

Main reason being... chances are, you have a GSR tranny and a GSR ECU. Combine these with the ITR head/manifold and the lowered compression and the car will run like ***.

Now if you have a Skunk2 P28 and a B16 or ITR tranny, then you'll be fine.
But most people don't have this, and it's why that setup will probably be slow.

Bottom line is, GSR tranny sucks. Get a 4.78 or 4.92 for it or get a ITR tranny. For a fast NA street car, GSR tranny is not an option in my book.

 

I would, if I knew the formulas

 

Thanks for the poinetrs, I was looking at the wrong info for my reference.


[Modified by Trey, 9:21 AM 1/15/2002]

 

Second that "GS-R tranny sucks" notion. I had a B18C1 before my B18C5 swap and the gearing on the GS-R tranny sucks. It's okay for the B18C1 due to the good midrange power and the 4500rpm VTEC, but with an ITR-spec motor and the 6000RPM VTEC it would suck donkeyballs. An ATS FD might help run through the gears quicker, but it still would drop out of VTEC sometimes when shifting.


But NO you don't have to buy an ITR motor to get the same type of power. GS-R motor can be built as good or better for less money - argue all day if you want to, but I've had BOTH and I know for sure. The avergare B18C5 baselines at 165hp MAYBE? If all you want out of a B18C1 is 165hp, then it's really easy and cheap. then sell the GS-R tranny and buy a used ITR tranny and re-chip the ECU to run ITR specs or better.

My 2 cents.

 

The two most impressive B18C1 motors I have seen PERTAINING TO MODS:

gsr98vtec on this board, Skunk2 cams, Mugen headgasket, JDM 4-1, greddy exhaust, comptech icebox. stock ECU, etc.
180.1/130.0 at the wheels

another local guy about 2 yrs ago...
gsr, stock bottom end, CTR cams, head milled 40 thou(not ported), USDM ITR header/b-pipe, iceman intake, PYR ECU, cam gears
188/137

gsr motors respond VERY well to compression.