Well I just installed 97 ITR cams in my GSR engine. I thought I installed ITR valve springs as well, but found out tonight from the guy I bought them from, that he sent me the wrong valve springs. Instead of sending me ITR Intake & Exhaust valve springs, he sent me GSR Dual Intake valve springs for bought IN & EX.

So now I am running dual GSR Intake Valve springs on both intake and exhaust side. I am supposed to have the car tuned in the morning and don't know what to do.

Will the motor be safe? Or should I just wait till I get the ITR intake valve springs, then have it tuned?

DonF, Master of the Universe, Combustion Contraption, please your input would be great!

Thanks

 

Wait till you get your ITR Inner IN springs. Why chance dropping a valve and blowing thousands of dollars when you can wait several more days for your springs

I'm sure you seen this already but just in case you didn't here's some good reading info
https://honda-tech.com/zerothread?id=1803606


I was in the same boat as you a few weeks ago. I wasn't sure if I should have run std. size acl bearings cause according to the crank codes, it was calling for green and brown bearings. But after measuring clearances and then plastigaging to confirm, I realized I needed undersized bearings. I could have spun a rod had I been impatient and just ran the std size. So what if I had to wait another 4 days for different bearings, at least now I know my clearances are right.

 

Ya I completely understand. I am actually posting this for my friend. I did all the work on and car and installed everything yesterday and was 99% sure that they were not ITR valve springs to begin with, but his car, he told me they were.

Well now, looks like I am the lucky one to get to redo everything again. If it were me, I would wait and just do the ITR springs.

 

you'll be fine.

 

iam running ctr cams with exact springs of yours

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BMo Tuning &raquo;</TD></TR><TR><TD CLASS="quote">you'll be fine.

</TD></TR></TABLE>


OEM Cams run...???

YOU GOT IT OEM VALVETRAIN&gt;......

Obviously you'll be fine.

 

just don't rev it over 8200k and it will be fine

 

I have some 01 ITR cams and im runnin a stock 95 GSR head with dual springs only on the in. side and i go to 8.5 all day long. have been for over a year.

 

Depending on the spring installed heights you may or may not have enough coil bind clearance.

Some people get lucky and some don't.

ITR springs have about 0.9mm more travel to bind than GSR springs. I know coz I've measured dem on dis macheen



Here are some specs



Rocket Motorsports fo da win!!!

You better run "thundercats"!!! NO MERCY FOR THE DUMB OR DA WEAK.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Master of the Universe &raquo;</TD></TR><TR><TD CLASS="quote">Depending on the spring installed heights you may or may not have enough coil bind clearance.

Some people get lucky and some don't.

ITR springs have about 0.9mm more travel to bind than GSR springs. I know coz I've measured dem on dis macheen



Here are some specs



Rocket Motorsports fo da win!!!
You better run "thundercats"!!! NO MERCY FOR THE DUMB OR DA WEAK.</TD></TR></TABLE>

LMFAOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOO

 

Ok lets see here. Honda decided to produce springs just for the itr/ctr cams. They couldve used gsr springs but they didnt, so why would you?

 

http://www.lightningmotorsports.com/techhonacua.htm

According to this, the 97 spec ITR uses the same intake spring combo in regards to part numbers as the intake spring combo found on the 97 spec GSR.

So from what i'm gathering here is that there really isn't much of a difference if you were to put GSR intake springs on both the intake an exhaust when installing ITR cams.

No difference. Both have redline rpm's of 8400 rpm's. Not only that, the NEWER (i.e., 2000-2001) itr motors have lighter valves, which is obviously the reason why they can have a different valve spring for those motors. However, when we have the HEAVIER gsr valve, we need to put the stiffer valve springs back on. I'm sure the NEWER (i.e., 2000-2001) itr springs do allow more lift before coil bind, but I don't think the GSR springs will coil bind with ITR cams. I could be wrong, but I would ultimately assume that they wouldn't come close.

Simple. I really think it's just that simple.

 

well this doesnt make too much of a difference since i did it on a single cam, but i used to run a single cam vtec d16z6 with a gude gorilla cam with my tune to 8.5k rpm on stock valvepsrings... with an occasional 9k rpm shift, but i didnt take it to 9k that often, just everyday lmfao

i got a deal on the cam so i ran it didnt have money for valvepsrings and retainers but i had money to spend on getting stuff to chip and tune my ecu myself so i spent it on that...

i never had problem with valve float except for 1 time when i over revved my motor to 10k on accident

but heres the cam specs and yes i ran this cam on 3 different motors and it ran 920's in the 1/8 mile spinning the street tires the whole way down the track yea its not fast but it was a sohc v with intake dc header exhaust and this cam

but ****it run the cam its not like b series are that much more then 200 dollar single cams

do it right or dont do it at all thats why i run stock type r now

PART NO: HCCS21

DESCRIPTION: Gorilla Cam. 6000 to 10000 RPM

POWER BAND: 6000 R.P.M. TO 10000 R.P.M.

IDLE: (Good) Around 750 R.P.M.

SPECIFICATIONS: Intake LIFT – 0.434 DURATION – 258

Exhaust LIFT – 0.405 DURATION – 258

 

The problem with running gsr intake springs with an itr intake cam isn't spring pressure. It's the fact that itr cams open the valve 11.5mm, while the gsr springs SUPPOSEDLY have a coil bind lift of 12.2mm. This means that when the cams, while in vtec, are at maximum lift, if the valvesprings were compressed 0.7mm farther down, you'd get coil bind.

You know, .7mm = .0275" which isn't very much at all. The recommended safe clearance is .050" to .060" which is far more than .027."

So now you see why it is important. Not just because it's ITR cams needing to be with ITR springs. ITR is just a name.

However, according to many sources, the 97 spec ITR and GSR have the same intake valvesprings. So this means that Honda said the hell with it with the ITR in that year in regards to coil bind clearance. I personally have a 2000 spec usdm gsr and plan on putting 2000 spec us itr cams in it with gsr intake springs on both the intake and exhaust. Not sure if I will be safe or not. I might just wait. I don't know.

 

Can someone step in and comment on whether .7mm is enough coil bind clearance. I mean, .7mm more valve travel, and then you get coil bind. Hmmmmm. I thought recommended has always been .050" to .060."

 

I would love to know this. Hell I can't seem to be able to get my hands on a set of itr intake springs. I'm either gonna not put the itr cams in and wait, or just put them in anyways. I have two sets of GSR dual intake springs.

I need more inspiration. Will I be cool.

 

It will be fine. rev the hell out of it.

 

Huh? ~.030 to .035" isn't very much. I'm gonna have to check it first. If I have .045" or .050" coil bind clearance, then i'm runnin' them.