12mm lift cams too aggressive for stock valve terrain? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Options13 · 02-02-2016, 12:54 AM

I'm curious on if 260 tomei pon cams with at 12mm lift is too aggressive for stock valve springs?

If so, would this be the best option for springs?

http://www.mazworx.com/store/ShopCart.aspx

e1_griego · 02-02-2016, 01:00 AM

Tomei tells you as much when they sell you procams

Quote:

Originally Posted by FRSport

We only carry Poncam as a 256 IN / 256 EX combo. Anything other duration is considered as the Procams, which requires valve spring changes for higher lifts.

Options13 · 02-02-2016, 01:08 AM

i called mazworx today, and they said it would be fine to run stock springs, as long as i'm on hydraulic lifters.

Just trying to get second opinions.

I wish i could score a deal on some JWT's

cotbu · 02-02-2016, 04:29 AM

I like 10.5 to 11.2~5 for stock valve train. That would mostly be used with 256 to 264 duration cams.

Sent from my SM-N910T3 using Tapatalk

Kingtal0n · 02-02-2016, 05:53 PM

These days you have to attach a number when you say "stock springs"

i.e. "brand new stock springs"
or
"stock springs with 150,000 miles"

If you have worn out stock springs with high mileage, then at least change them for some new unit. As you dig deeper into a head, you "might as well do things while you are in there" like change the guides, do a valve job, etc.. so a recommendation to change springs must be coupled with an existing engine state (mileage is a factor)

Options13 · 02-02-2016, 07:08 PM

At this rate I'm either going to upgrade my springs to super tech double springs or jwt s3 cams.

The mileage on my stock springs are unknown. I had BC springs on the head but I'm gonna get rid of those, I think they are too stiff, I threw a rocker arm so I wanna prevent that from happening, so maybe a less aggressive cam, or good quality springs.

02-02-2016, 12:54 AM	#1
Options13 Nissanaholic! Join Date: May 2007 Location: OR Posts: 1,825 Trader Rating: (43) Feedback Score: 43 reviews	12mm lift cams too aggressive for stock valve terrain? I'm curious on if 260 tomei pon cams with at 12mm lift is too aggressive for stock valve springs? If so, would this be the best option for springs? http://www.mazworx.com/store/ShopCart.aspx __________________ Drift team page www.facebook.com/savageimpression

02-02-2016, 01:08 AM	#3
Options13 Nissanaholic! Join Date: May 2007 Location: OR Posts: 1,825 Trader Rating: (43) Feedback Score: 43 reviews	i called mazworx today, and they said it would be fine to run stock springs, as long as i'm on hydraulic lifters. Just trying to get second opinions. I wish i could score a deal on some JWT's __________________ Drift team page www.facebook.com/savageimpression

02-02-2016, 04:29 AM	#4
cotbu Post Whore! Join Date: Sep 2005 Location: SWFL Age: 49 Posts: 3,318 Trader Rating: (3) Feedback Score: 3 reviews	I like 10.5 to 11.2~5 for stock valve train. That would mostly be used with 256 to 264 duration cams. Sent from my SM-N910T3 using Tapatalk __________________ LoverTechnologies "Half Broken Things!"

02-02-2016, 07:08 PM	#6
Options13 Nissanaholic! Join Date: May 2007 Location: OR Posts: 1,825 Trader Rating: (43) Feedback Score: 43 reviews	At this rate I'm either going to upgrade my springs to super tech double springs or jwt s3 cams. The mileage on my stock springs are unknown. I had BC springs on the head but I'm gonna get rid of those, I think they are too stiff, I threw a rocker arm so I wanna prevent that from happening, so maybe a less aggressive cam, or good quality springs. __________________ Drift team page www.facebook.com/savageimpression

02-02-2016, 05:53 PM	#5
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 41 Posts: 4,829 Trader Rating: (17) Feedback Score: 17 reviews	These days you have to attach a number when you say "stock springs" i.e. "brand new stock springs" or "stock springs with 150,000 miles" If you have worn out stock springs with high mileage, then at least change them for some new unit. As you dig deeper into a head, you "might as well do things while you are in there" like change the guides, do a valve job, etc.. so a recommendation to change springs must be coupled with an existing engine state (mileage is a factor)