My understanding, after months of lurking on this board, is that the b16a2 head and the b18c5 head are the same casting, but the ITR gets a mild factory pnp. also, the itr obviously gets the more aggressive cams and valvetrain.

My question is about the valves themselves, and more specifically, their diameters. are the itr valves bigger than the b16a2 valves? they kinda look the same but i dont trust my eyes and i dont have a micrometer handy. if i were to take this ITR valvetrain and swap it into my b16a2 head, would I have to machine the head so the valves fit and seal properly? or are they the same size, needing no machining?

thanks!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ( o )( o ) &raquo;</TD></TR><TR><TD CLASS="quote">My understanding, after months of lurking on this board, is that the b16a2 head and the b18c5 head are the same casting, but the ITR gets a mild factory pnp. also, the itr obviously gets the more aggressive cams and valvetrain.

My question is about the valves themselves, and more specifically, their diameters. are the itr valves bigger than the b16a2 valves? they kinda look the same but i dont trust my eyes and i dont have a micrometer handy. if i were to take this ITR valvetrain and swap it into my b16a2 head, would I have to machine the head so the valves fit and seal properly? or are they the same size, needing no machining?

thanks! </TD></TR></TABLE>


x2

 

yes i believe that they should swap just fine, not 100% but im about 98% sure.

 

they should fit fine.same size.

 

cool thanks guys

 

i thought there was a difference between the valves or is it in the stems???? i think the stems are thinner on the itr

 

so they would be lighter right

 

I believe they have different angle seating (45degree and 60) and thinner stem.

 

From ITRCA.com

Exclusive lightweight valves:

* 12 percent weight reduction
* Valve shaft width was decreased from 5.5mm to 4.6mm
* The angle of the valve seat opening was tightened from 60 to 45 degrees
* Valve heads are lightened to reduce valvetrain weight
* Weight recduction allows engine to rev 200 rpm's higher

another member posted this the other day, i forget which thread tho

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by redlineintegra &raquo;</TD></TR><TR><TD CLASS="quote">From ITRCA.com

Exclusive lightweight valves:

* 12 percent weight reduction
* Valve shaft width was decreased from 5.5mm to 4.6mm
* The angle of the valve seat opening was tightened from 60 to 45 degrees
* Valve heads are lightened to reduce valvetrain weight
* Weight recduction allows engine to rev 200 rpm's higher
</TD></TR></TABLE>

good to know. so then i guess i need more info like ASAP.

i just dropped off 2 b16 heads to the machine shop today. one has an ITR valvetrain but it has been milled wayyyyyy too much so i'm having him put the valves in an unmilled casting. will i have to tell him to modify the seat opening? if so, how? or should i just stick with b16 valves and just swap the ITR springs/retainers? also - if i swap valves, i guess i'll need ITR valve guides too, yes?

the new valve seals are on their way so he's just prepping the head until they arrive which buys me some time.

 

IF THE VALVE SEAT IS DIFFERENT THEN YES YOU WILL HAVE TO RE SEAT THE NEW VALVES...

 

thats what i figured - just wanted confirmation, not to be yelled at

so now the question remains - can i stick with b16 valves and just the ITR springs and retainers? or would i be able to use the ITR springs and b16 retainers?

 

sorry abt the yelling you can use the springs and retainers from the itr but what is the diff between the b16 and itr retainers??? are they lighter??? or stronger??? or the same ****???

 

ITR valves DO NOT have a 60deg seat.They have a 45 seat just like all honda b series valves.They are interchangeable w/your valves.The only difference is the thinner stem by the valve head.

 

all dohc vtec b series cams are 5.5mm thick... so ye athey'll swap. also the face of the valve is 33mm on the intake and 28mm on the exhuast.
the ls valves are 31/28 and the stems are 6.5mm thick.

 

ok so i just dropped off a third head to the machine shop, along with my ctr-slugged b16a2 for a crank swap.

head 1 = ITR valvetrain, milled too much to use = dead
head 2 = ******* cracks from the spark plug holes to the valves = dead
head 3 = just dropped off, hopefully the casting is still good so I can put the ITR vavletrain in...dammit now i need another b16 head for my 2nd motor

then tomorrow I will drop off a bare b16 block for him to re-ring and re-bearing....and Im' still waiting on parts.

visually the valves look the same but he won't be able to pull them and measure them until later today.

 

the B16a B18C5's use the sam exhaust valves 14721-PR3-000 , the intakes are what is different the b18C5 are 14711-P730-J01 the B16's are 14711-PR3-000

 

now that's what i'm talkin about! part numbers and all....so now that the exhaust valves are teh same, what are the differences in the intake valves? stem diameter? seat face angle?

i guess i'll find out tomorrow when dood pulls the valves from the heads. hopefully i remember to bring a camera....

 

the valve seat angles and the stems are 4.5mm dia vs 5.5 for the b16 in the intake port.they are 12% lighter

 

so b16 valves and b18c1 valves should be the same correct?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98B18C1 &raquo;</TD></TR><TR><TD CLASS="quote">so b16 valves and b18c1 valves should be the same correct?</TD></TR></TABLE>

Im still trying to figure that out too

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91Civic_Joe &raquo;</TD></TR><TR><TD CLASS="quote">Im still trying to figure that out too </TD></TR></TABLE>

im guessin they are cause i just found out they have the same part #'s