KA-T Questions

[calebbo]

The goal is 220WHP

This is what I bought:
Turbo, Elbow, Coolant lines (Rebuilt SR T25)
Turbo Manifold (ISR V2)
FMIC Kit(CX Racing)
3" Exhaust (HKS Hi Power)
550cc Injectors (Deatschwerks)
Enthalpy Tune
Z32 Maf (N62)
BOV (HKS)
Headgasket (Felpro)
ARP Head Studs
Spark Plugs
Oil Feed/Oil Drain Lines
Glow Shift Gauges (Boost, Water Temp, Oil Pressure, Wideband)

Timing Chain Kit Install by shop (Includes *)
* Front Main Seal
* Tapped Oil Pan
* Oil Pump

My question is pertaining to the head.

When I swap out my head studs to ARP and change the gasket to a felpro, should I go ahead and swap out the valve stem seals?

I also have 200PSI compression on all 4 cylinders on a warm engine. Wide open throttle. 4 engine cranks. MATCO compression tester.

I assume this is carbon buildup since max is supposed to be 179-180PSI. So should I set the pistons to TDC and scrape off the carbon on the pistons while the head is off?

[tuzzio]

If you're already doing all this work, I would absolutely change the head studs and head gasket.

[calebbo]

If you're already doing all this work, I would absolutely change the head studs and head gasket.

The HG and head studs are a given. I just don't know if I should swap the valve stem seals and scrape off the carbon on the pistons.

[EnnEssEnnKAT]

Valve stem seals have a spring built into them so they wear and tear and get weaker over time. Prob a good idea if you have the spring compressor to remove and replace them with new.

Sent from mTalk

[calebbo]

Valve stem seals have a spring built into them so they wear and tear and get weaker over time. Prob a good idea if you have the spring compressor to remove and replace them with new.

Sent from mTalk

Do the valves need to be replaced as well or are they fine?

I have low HP goals. Around 220 at the wheels.

The warm engine compression test showed 200psi on all four cylinders after 4 cranks. It seems to be a very healthy engine. It has ~90k miles on it.

[EnnEssEnnKAT]

Do the valves need to be replaced as well or are they fine?



I have low HP goals. Around 220 at the wheels.



The warm engine compression test showed 200psi on all four cylinders after 4 cranks. It seems to be a very healthy engine. It has ~90k miles on it.

It seems to be pretty high compression for a used motor. As for the valves those do not need to be replaced, they're typically reused. What I've done is remove them and soak them in a special detergent to remove the carbon deposits and then reassemble. That's the best 'free' option.

Sent from mTalk

[tuzzio]

Valve seals are so cheap youd be a fool not too.

jwt makes a tool where you dont have to remove the head. works well.

[calebbo]

It seems to be pretty high compression for a used motor. As for the valves those do not need to be replaced, they're typically reused. What I've done is remove them and soak them in a special detergent to remove the carbon deposits and then reassemble. That's the best 'free' option.

Sent from mTalk


That's why I assumed it was carbon build up.

Anything I should do besides replace the seals? How a bout scraping off the carbon from the tops of the piston? Will that help lower the compression test to 180?

[calebbo]

Valve seals are so cheap youd be a fool not too.

jwt makes a tool where you dont have to remove the head. works well.

Well a fool I will not be. Replacing them.