Stiffer springs on a stock valve train robs power due to friction? Any thoughts????

[jojeezek]

Please PM me on what your take on this is? I have D15B head I am building. Port and polish, 3 angle valve job, milling but I am keeping the stock cam and valves. If I go with performance springs only will this add power or take away ?

[Barefoot]

Please PM me on what your take on this is? I have D15B head I am building. Port and polish, 3 angle valve job, milling but I am keeping the stock cam and valves. If I go with performance springs only will this add power or take away ?can explain to me y u need upgraded springs for a stock cam.

springs dont add power. they add reliability and ability when used with a bigger cam/cams.

[punkr6]

the springs will allow you to rev a little higher, thats about it...

[Barefoot]

the springs will allow you to rev a little higher, thats about it...
on stock cam whats the point.

[jojeezek]

Well see eventually I'm gonna boost the D series. I'm thinking about running 10 psi boost not more then this. I also expect the D to rev higher with the chipped P28 and the Hondata S300 set up. So again would I benifit for the springs with the stock valves and cam or would it be a waste of money. Can the stock springs and cam hold up to 8000 rpms? Even if I dont gain power will the springs and retainers add in any way to my build with the stock valve train and cam? The head that I have is a D15B vtec of a jdm motor. Any thoughts???

[jojeezek]

Also I plan on sticking to the low boost as I do not plan on building my bottom end.....

[jojeezek]

???

[jojeezek]

Would there be any benifit to putting after market springs and retainers with the stock cam and valve train? Even if it adds strength and reliability?

[dorin48]

Well normally i would tell you that revving higher on a stock cam is silly but.........

I decided to look at some N/A d15b dynos and it looks like 8000rpms IS good lol.

For example >

Bisimoto Header
stock jdm D15b head
D16a6 sleeved bore to 78mm.
cometic 80 thousands thick headgasket
stock jdm d15b cam
stock z6 intake manifold
stock ignition
no exhaust
s300
151 whp, 128 ft/lbs tq

http://i4.photobucket.com/albums/y144/bisimoto/bisimotoheaderD16.jpg

In light of this the springs "could" be a decent reliability investment.

To answer the friction question: Yes, in theory. In the real world I doubt you would even see a 2hp loss honestly.

[jojeezek]

Well normally i would tell you that revving higher on a stock cam is silly but.........

I decided to look at some N/A d15b dynos and it looks like 8000rpms IS good lol.

For example >

Bisimoto Header
stock jdm D15b head
D16a6 sleeved bore to 78mm.
cometic 80 thousands thick headgasket
stock jdm d15b cam
stock z6 intake manifold
stock ignition
no exhaust
s300
151 whp, 128 ft/lbs tq

http://i4.photobucket.com/albums/y144/bisimoto/bisimotoheaderD16.jpg

In light of this the springs "could" be a decent reliability investment.

To answer the friction question: Yes, in theory. In the real world I doubt you would even see a 2hp loss honestly.

Thanks Man. This is exactly what I was lookin for......

[Vteckidd]

no it wont cause loss of power, none that you can accurately calculate which means less than a hp at most.

[punkr6]

on stock cam whats the point.

to rev higher, The stock cam makes power past what the stock springs can old. a lot of the single cam boost guys are doing it with great results...

[jojeezek]

Awsome....just what i wanted to hear....:D
quote=punkr6;38403126]to rev higher, The stock cam makes power past what the stock springs can old. a lot of the single cam boost guys are doing it with great results...[/quote]