MP5T Rebuild Photo Journal

[Brian MP5T]

All the harsh edges for valve relief, they are prone to causing detonation...

 

[Brian MP5T]

dizzam boy. cant wait to see the end product. keep it up.

Thanks, I hope I can remember how it goes back together...

 

[BlkZoomZoom]

Turf Suggested that the rough edges be removed. I'm lookinng into the cost but have decided to do it regardless of cost. Will buff at the same time.

Pictures of a Mirror Piston Top pending...

geee.... I wonder where he got that idea.(dunno)

The idea is to not make them polished however. You should treat them as an extension of the bowls in the head (intake side).

 

[Brian MP5T]

Seen. There are small lines in the top of the piston from manufacturing that have been removed. I still have to work on the valve relief.

 

[BlkZoomZoom]

If you saw, then why are you polishing?

 

[Brian MP5T]

If you saw, then why are you polishing?

I don't understand?

 

[BlkZoomZoom]

huh? lol.

 

[BlkZoomZoom]

The combustion chamber is the one looking at the piston in the real world and chambers don't like to see themselves in mirror-like domes. To quote T.O.O.

 

[Brian MP5T]

Ah, LOL.

 

[ddogg777]

Cermet coat those bad boys...then you don't need to polish them neither.

 

[Brian MP5T]

Wont that keep cylinder temps higher by blocking the hear from traveling down the skirt?

 

[ddogg777]

Wont that keep cylinder temps higher by blocking the hear from traveling down the skirt?

Yes, that is the whole point...you don't want the engine to soak up heat (heat is death to all mechanical parts). Coatings are designed to keep the heat from soaking.
In calculating power from an engine you only need to know a few things: intake temperature, exhaust temperature, mass of air. If you can raise that exhaust temperature (this is why we coat headers and combustion chambers) by keeping in the heat through coatings or injecting nitrous for a hotter burn or igniting a more powerful spark, you will get more power. If you can lower the intake temps by injecting nitrous (yes, it does both) or putting on a more efficient IC, you make more power. And, of course, if you stuff more air in there, you will get more power. In all cases you need to tune properly...

 

[Brian MP5T]

Yes, that is the whole point...you don't want the engine to soak up heat (heat is death to all mechanical parts). Coatings are designed to keep the heat from soaking.
In calculating power from an engine you only need to know a few things: intake temperature, exhaust temperature, mass of air. If you can raise that exhaust temperature (this is why we coat headers and combustion chambers) by keeping in the heat through coatings or injecting nitrous for a hotter burn or igniting a more powerful spark, you will get more power. If you can lower the intake temps by injecting nitrous (yes, it does both) or putting on a more efficient IC, you make more power. And, of course, if you stuff more air in there, you will get more power. In all cases you need to tune properly...

That would place the burden on the valvetrain and the manifold. No Thanks...

 

[ddogg777]

Brian, you better take off your turbo then. That is putting a lot more burden on you valvetrain and manifold than the coatings would...
You're totally blowing this out of proportion.

 

[Brian MP5T]

Brian, you better take off your turbo then. That is putting a lot more burden on you valvetrain and manifold than the coatings would...
You're totally blowing this out of proportion.

It's not that... I feel that it's a step that is not required or is overkill for me. The input was great and I'm sure is works very well.

 

[TurfBurn]

Finding that fine line between overkill and "doing things right" is hard... I too am not going with the coatings for various reasons... I'm also only upgrading the exhaust side valves, and not bothering on the retainers and springs.

 

[ddogg777]

Lol, I thought polishing your piston domes and cam gears was overkill...

 

[TurfBurn]

The man has an obsession with all that shines... what can we say!

 

[Brian MP5T]

Lol, I thought polishing your piston domes and cam gears was overkill...

I just polished a fingerprint off of one and found that it came up like a mirror so I did the rest...

 

[Brian MP5T]

The man has an obsession with all that shines... what can we say!

Bling!