I had both in my garage the other day and i was going to drop my block off at the machine shop to get balenced and i noticed that the Type R crank is at least 10lbs more than the gsr crank. does it make a difference in performance or anything? i know that almost everything on a type R is a little more beefed up that a gsr so is having a type R crank better . But also then i remembered that for all motor lighter is always better. So which one should i put in my motor if you guys could tell me that would be great.

 

search my friend "itr gsr crank"

https://honda-tech.com/zerothread?id=423970

 

weight

 

as covered in that thread, the ITR crank is heavier(heavier counterweights) but you cannot, for a fact say that one is better than the other.

They can excel at two different things. The ITR crank being the heaviest would be best suited for high rpm power, because it has the most momentum. And on the other end of the spectrum, i believe the LS/B18B crank is the lightest, which is why it is favored for drag, power earlier on.......

someone bitchslap me if that's too general of an opinion, thats just been the expression explained to me by an engine builder when comparing cranks

 

Well, if the b18c1 and b18c5 rods are the same and the blocks are identical, where does the slight displacement difference come from? I thought the ITR had a slightly larger displacement than the GSR. I was assuming this was due to a difference in cranks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tegbuilder &raquo;</TD></TR><TR><TD CLASS="quote">Well, if the b18c1 and b18c5 rods are the same and the blocks are identical, where does the slight displacement difference come from? I thought the ITR had a slightly larger displacement than the GSR. I was assuming this was due to a difference in cranks.</TD></TR></TABLE>

they are the same displacement

 

the displacement is the same. type r might have like .0025 more displacement because of the bigger combustion chambers on the head. nothing that is noticable.

 

Same displacement. Combustion chamber does not affect displacment, just compression.

Bore and stroke determine displacment.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b19coupe &raquo;</TD></TR><TR><TD CLASS="quote">Same displacement. Combustion chamber does not affect displacment, just compression.

Bore and stroke determine displacment.</TD></TR></TABLE>

 

type R crank and gsr crank are not the same,the only thing they share in simularitys is the amount of stroke and journal sizes.. the R crank has heavier counterweights and is made from a slightly different material..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MHRacing-310 &raquo;</TD></TR><TR><TD CLASS="quote">type R crank and gsr crank are not the same,the only thing they share in simularitys is the amount of stroke and journal sizes.. the R crank has heavier counterweights and is made from a slightly different material.. </TD></TR></TABLE>

its repeat day!

 

think about it. when you have a bigger bore you are creating more area, same goes for having more area on the head.

1797.5627=displacement of a stock gsr
1797.5671=displacement of gsr with b16 head

like i said its a very small #

 

You could slap a head onto the block that creates 20 gallon combustion chambers, and the displacement will not be affected. It's only bore x stroke that affect displacement. Hell, you could take the head off thus creating an infinitely large combustion chamber....and the displacement will remain the same.

 

IVE HEARD FROM LUCKYRACING THAT THEY ARE MADE OF DIFFERENT MATERIALS

 

Displacement = Pi X 1/2 R (sqaured) X H X # of cylinders.
Example GSR/ITR
Pi ~ 3.14
R = 8.1 Centimeters (81mm bore)
H = 8.72 Centimeters ( 87.2mm stroke)
# of Cylinders = 4.
Plug the numbers in:
3.14 X 4.05(1/2 of 8.1=4.05) X 4.05 X 8.72 X 4 = 1796.454288.

Combustion chamber volume is not part of any displacement calculation that I have seen. If there is a formula for calculating diplacement that includes combustion chamber volume, post it. We could all learn something

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Beave0101 &raquo;</TD></TR><TR><TD CLASS="quote">They can excel at two different things. The ITR crank being the heaviest would be best suited for high rpm power, because it has the most momentum. And on the other end of the spectrum, i believe the LS/B18B crank is the lightest, which is why it is favored for drag, power earlier on.......
</TD></TR></TABLE>
Heavier parts are better suited to low end power (since they can store momentum better) at least I'd assume a heavier crank would have the same effect as a heavier flywheel, no?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Lsos &raquo;</TD></TR><TR><TD CLASS="quote">You could slap a head onto the block that creates 20 gallon combustion chambers, and the displacement will not be affected. It's only bore x stroke that affect displacement. Hell, you could take the head off thus creating an infinitely large combustion chamber....and the displacement will remain the same.</TD></TR></TABLE>

What he said. No way does head volume/specs have ANYTHING to do with displacement.

 

well sorry if im wrong. this is what ive been told, but not everyone is right.

 

a larger combustion chamber usually implies a larger bore, but doesn't necissate it.
A larger bore requires a larger combustion chamber (on a B20Vtec for instance.)

 

the only thing that change or creates displacement.strokexbore.
when you use different heads such as gsr you will raise compression,and with b16 and type-r you will loose compression.yes you will gain some if bored or stroked,but not just by switching heads.

 

i think hri is right go to c-speedracing.com and play with there displacement calculator it does matter

 

I hate seeing the search thing cuz when you actually do a search, you get more replys to search it than the actual answer