Sorry for the noobish question if that has been covered countless times, I dont visit this section and the search function is retarted.

Is there a difference between the ITR crank vs. the GSR crank? I know they have different part numbers but what are the exact differences between the two?

TIA

 

if i remember right it's lighter as well as being balanced.

 

Actually it's heavier because it is counterweighted.

 

start reading:
http://itrsport.com/

 

Its highly rigid crankshaft is made of forged, high-strength steel with eight full balance weights to reduce vibration at high rpm by 20 percent. The journals of the crankshaft also feature a special micro-polished surface finish for reduced friction and increased durability.

8-Weight, Fully-Balanced Crankshaft:
Balancing weights were added to number 1 and 4 wich reduces vibration at high rpm by 20 percent
The journals of the crankshaft also feature a special micro-polished surface finish for reduced friction and increased durabilty
Attachment point of the connecting rods to the crankshaft uses a new, adjustable connector that allows the mechanics to manually adjust the connection using a micrometer so they can compensate for the stretching of the connecting rod bolt.


Thanks RockinaRHard


I am assuming the crank has Pr3 cast on it somewhere? If not how do I tell the difference?

 

looks like i didn't remember right.

 

It's actually marked "R" on the bottom of the crank somewhere.

 

Can anyone verify this? Better yet anyone have an ITR crank that can take pics of the casting numbers or the "R", just dont want to drive a few hours to look at a crank and them be clueless in identifying it. I trust the seller but its just how I am

 

I think this is paraphrased form the 1997 ITR Helm supplement. That manual had a major marketing slant to it to make it seem like the ITR engine had many things that the GSR engine did not. I don't like politics in service manuals. Reading that makes one think that the ITR carnk has two extra counterweights compared to the GSR. The fact is that it is just heavier than the GSR crank to reduce vibration at high RPM. The connecting rod bolts are indeed unique to the ITR.

 

No pics, but I'm 100% sure... Just rebuilt mine

 

Interesting, let me ask you this, how do you make 1 crankshaft heavier than another identical piece without adding counterweights?

I wish someone had a picture of both, we could put this to bed right now.

 

Journals and snoot are the same. The crank throws on the ITR are bigger than the GSR.

For 100$ you can get a GSR crank balanced where it will perform better than a ITR crank.

 

So for $100 I cant take an ITR Crank and make it perform better than said modified GSR Crank?

I want the weight of the crank, not looking to shave weight.... 10,000+ rpm Turbo Motor not NA

 

No, the performance improvement is not in better balance. The improvement is lower inertia which allows you to carry the torque further out and extend the powerband. A moded GSR crank has lower inertia than a ITR crank with a better than ITR factory balance.

If you want to improve your ITR crank, you are now taking about a Castillo's job. It will be a lot more than $100.

 

Like I said, I do not like service manuals that have a political bias. The implication of the manual is that the GSR crank would only have 6 couinterweights, which is not the case. They should have said: Balancing mass was added to number 1 and 4...

 

Guys,

I'm sorry in my previous posts I said conterweights. I meant crank throws.

Corrected in my posts above.

 

I want the heavier ITR crank for a number of reasons, apparently for one it helps with vibrations/dampening (which at super high RPM is critical). The extra weight should help with keeping the RPM/Boost up in between shifts (what is this you say about better balance, why would a modded GSR better balanced than the ITR with the heavier weights?) and I think with the combination of a good aftermarket Damper and my semi-heavy flywheel I will get alot of life out of my bearings and good throttle response and most importantly reliability out of my setup. I am going to have it micropolished so if anything was done by Honda I am doing away with that so thats a non-issue.

Remember you dont want lightweight stuff for Turbo Motors, heavy parts with higher inerta are generally welcomed in my situation.
Good info in here so far

 

I asked Jeff Evans about it....

"They are several pounds heavier, as well as better balanced from the extra weight. They are the best OEM crank you can buy, but super hard to find"

That is all I need to know....lol

 

Do I have to do all the work? people use the search!
In this thread are pictures and info.
https://honda-tech.com/forums/acura-integra-type-r-8/little-ot-itr-vs-gsr-crank-423970/

 

Ok, you tell the guy balancing the crank the operating range and spec the level of vibration you want to see. Most choose better than factory.


You seem to be confusing heavy with strength. You want the lightest weight possible but also want required strength for the application.

 

That would be so hard t oidentify unless you had a GSR crank on hand to see the differences. In for a pic of the "R" casting.

 

Lol I feel dumb because I cant totally tell by the pic which crank is which, I am going to say the left is the ITR, it looks beefier in the circled counterweight area's. It also looks to be drilled alot more but my GSR crank is all drilled up like that too so IDK...lol

Then again the counterweights opposite the journals look longer to me on the right crank than the left but maybe its just the may its machined and my eyes are just playing tricks on me.

 

Can someone tell me exactly which crank pictured above is the ITR Crank? The crank in my engine now (GSR) is stamped with an "R" and looks like the one on the right.

 

the crank on the left is the itr. i have a gsr and itr crank here and i weighed both too. as i recall they were the same weights. they look different just like the above pic.

my itr is on bottom. gsr on top.



and the way to tell if its an "R" is that there is an "R" on the crank. look below.