Reply to thread

See what others are reading now! Try Forums > Current Activity

Message: <blockquote data-quote="shiroitenshi" data-source="post: 1064345448" data-attributes="member: 27518">Well, this is another random tech article. Its not really a big thing since nobody installs their own vavlesprings, but here are some stuff I learned. Valvesprings usually has its own spec sheet, they are not usually published online, but you can request them from the manufacturer. Most US valvespring makers have them on request. Terminology you need to know. installed height: This is how tall the valve springs are after they are installed. The install height is different due to the valve seats. usually there is a small difference. as long as its within 0.5mm, shouldn't matter much.why is it important:the installed height preloads the spring, this gives you "seat pressure" that means how hard your valves press on the valve seats. seat pressure: This is how hard the valves press on the valveseats. For lastability, we don't want it very high, because it stresses the valvestems. but for turbos, we want it high enough so that it will close properly against the flow of air rushing in from a turbo or supercharger. We can't really change this springs to spec, but we can change valves seats and grind them to get the seat pressure we want. The springs specs usually have seat pressure vs install height table. Too high, and you risk breaking your valves even if you have good clearance. coil bind limit:this is usually the limit where the valvesprings bind. Means if you compress it past this limit, it wont return back to its original height. Most aftermarket honda is 19mm+, but take this with a pinch of salt, the older and worn out the springs, this number is reduced a lot. Thats all I remember for now, its something to pay attention to if you run aftermarket cams. They are WEAR & TEAR items and need to be replaced from time to time.Sent from my GT-I9100G using Tapatalk 2</blockquote>

Verification

The Marketplace Latest

Mugen MS-C Full Bucket Seat Civic Type R FL5 FK8
- Started by aycy
- Engine and Performance
Boost Logic Boostlogic Oil Cooler Kit R35 GTR GTR35
- Started by aycy
- Engine and Performance
Linney IHI 800WHP Turbo Kit R35 GTR35 GTR
- Started by aycy
- Engine and Performance
Varis R35 GTR GTR35 Front Bumper
- Started by aycy
- Exterior and Body
HKS Spec R Titanium Exhaust with Y pipe R35 GTR GTR35
- Started by aycy
- Engine and Performance
2016 BMW 120i LCI M Sport F20 1.6 Auto
- Started by aycy
- Cars for sale
GR Yaris H&R Front Rear Anti Roll Bar
- Started by aycy
- Chassis and Wheels
BBS RI-A 10J God Spec FK8 FL5 Honda Civic Type R...
- Started by aycy
- Chassis and Wheels
Rays Gram Lights 57CR GR Yaris Subaru Impreza Rim...
- Started by aycy
- Chassis and Wheels
2019 Toyota FORTUNER 2.4 VRZ 4X4 (A) Diesel
- Started by aycy
- Cars for sale

Posts refresh every 5 minutes

Haltech 500 o2 control

Hi Guys,

just wanna know how does haltech sprint 500's o2 control works.

does it actually change the value on the base map permanently

or

just compensate the the settings on the base map leaving all the values...

Leaked: All Audi Models Till 2012

Audi designs almost never fail to awe. The R4 is simply gorgeous, with design cues from the R8 and obviously smaller, it could be the successor to the...

Help! Mysterious Blinking Green Turbo Light (GSR)

hey guys,

Need some input from the sifus a bit... this headache is really driving me crazy...

Here's the situation, swapped my air filter two days ago... and that's where the problem started.

After the swap, the...