What is the difference int-ext ITR valve springs

Reply Subscribe

Thread Tools

Search this Thread

Nov 11, 2003 | 03:08 PM

Wes d

Thread Starter

Junior Member

Joined: Nov 2001

Posts: 350

Likes: 0

From: Sacramento area, CA

What is the difference int-ext ITR valve springs

I have a set of 16, yellow, intake itr valve springs I'd like to use on my head.
I was told this is the setup to run along with portflow inners. My question is WHY?
Are the itr intake springs stiffer than the exh side springs?

Nov 24, 2003 | 09:35 PM

WCI

Junior Member

Joined: Mar 2003

Posts: 888

Likes: 0

From: Placerville, CA, USA

Re: What is the difference int-ext ITR valve springs (Wes d)

I would like to know that one too.

Nov 24, 2003 | 09:38 PM

EF_LSVtec

Honda-Tech Member

Joined: Apr 2002

Posts: 4,281

Likes: 1

From: Hayward, CA 94541, USA

Re: What is the difference int-ext ITR valve springs (Wes d)

I guess because the intake cam has higher lobe than the exhaust...but who knows for sure except Honda factory techs...

Nov 25, 2003 | 07:53 AM

Mr Hammond

a/k/a Jomo

Joined: Jan 2002

Posts: 6,275

Likes: 0

Re: What is the difference int-ext ITR valve springs (Wes d)

When doing so on a B16A you do it to upgrade the exahaust to dual valve springs which are also stiffer. The ITR already has dual valvesprings on both sides. The intake side just happens to be a bit "stiffer".