My question contains to the diffrence between the grs engine and the type r. I am aware that the engine code is b18c. Is the b18c1 the grs? and the b18c is the type r? Or is the type r b18c5. For what i know the number are refuring to american right. Or and i just so lost it is not even funny. Please help.

 

b18c= jdm type r and gsr
b18c1= usdm gsr
b18c5= usdm type r
SEARCH..if u wanna know more

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by black93delslow &raquo;</TD></TR><TR><TD CLASS="quote">My question contains to the diffrence between the grs engine and the type r. I am aware that the engine code is b18c. Is the b18c1 the grs? and the b18c is the type r? Or is the type r b18c5. For what i know the number are refuring to american right. Or and i just so lost it is not even funny. Please help.</TD></TR></TABLE>

block codes are kinda stupid, throughout the world, they use different codes b18c in japan for both type R and GSR, then in different parts there is b18c3 c4 c6 etc

GSR has a P72 head, which is very similar to the ITR head, it has 31mm valves compared to the ITR which has 33mm valves, then the GSR head has smaller combustion chamber VS the type R head. This will give you approx .2 higher compression when putting any block onto a GSR head VS ITR head. The intake manafold is totally different and uses a dual runner intake system. For low RPM operation, it blocks off some of the air to allow more torque to be created so the engine isnt "flooded" with air and bog. Not very effective in my own opinion, but if yiou look stock for stock, the GSR manages to create an extra few fl/lbs of torque down low. Not worth loosing the upper end power though. The GSR cams have near the same amout of duration as ITR cams, but not nearly as much lift. The ITR cams are able to have a higher lift profile because of the stiffer valvetrain used on the ITR head. The ITR has different everything. Stiffer valvesprings, lighter intake valves, higher compression pistons (USDM 10.6:1 vs USDM 10:1) has different rods and a slightly ported head from the factory. Also the ECU has more agressive fuel and ignition maps.

All this for 600 RPM's higher of reving and 30 hp

Im kinda tired, so I hope that made sense

 

The GSR and ITR cranks are also different.

GSR/Type-R valvesprings have the same Honda part number. Type-R has better lost motion assemblies. And don't forget the red valvecover...

 

really? i didnt know that GSR valvetrain was the same as ITR

what about the retainers ?

drool the red valvecover gives it 10hp

 

thanks for the great replys

 

type r and gsr valvetrain is the same can anyone verify this?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ryan C &raquo;</TD></TR><TR><TD CLASS="quote">type r and gsr valvetrain is the same can anyone verify this?</TD></TR></TABLE>

In my experience, the ONLY WAY to tell if "different" honda parts are the
same is to compare the "complete" part #'s, if you have access to a parts
book or the software or fiche. It's usually the LAST 2 or 3 characters of the
part # that differentiate same parts, same applications from revisions or variations. As an example, ALL USDM CRX heads are part # 10003.
98% are also "PM5", but NONE of the LAST 3 characters are the same for ANY of the 13 different heads listed in the factory parts manual.
I know this doesn't answer the question at hand , but it does show the
chances of the two valvetrains as being the 'same' as rather small.
HTH

 

i realy realy doubt they are the same

 

when does b18c1 vtec engage 5500?

 

Between 4,400 and 5,000 rpm, depending on throttle position.

 

heads are different;
different port angles
arr head( pr3) has a ''home'' port job on it
quench
intake valves are lighter in the arrr
valve springs are different( well different intakes; intake used on exhaust)
different lma
same valve size
cams


block
crank is lighter on arr
rods
pistons

alternator has lower output on arr

 

The only common parts between ITR and GS-R heads are half of the valve springs. The ITR's dual exhaust valve springs are in fact the exact same part numbers as the GS-R's dual intake valve springs. ITR then has stiffer dual intake valve springs, while the GS-R only has single exhaust valve springs.