[RenownMN]

So we just finished this head for our sponsored Miata Car in FL. This is our Stage 4 "Full Race port." When porting these heads we attack every angle possible. We cut the valves and valve seats here in house and vacuum check every valve for a proper seal. To ensure proper valve train geometry we set and adjust the installed valve tip height. This attention results in maximum performance and reliability. We are working on building an inventory of heads to help expedite the process to help keep your down time to a minimum and your car on the track longer. We will also be offering core exchanges as well. Tell us what you think.

Specs:
-Renown 4 angle Valve Job
-Renown Full Race Port
-Renown Chamber work
-Resurface
-Supertech dual valve springs
-Supertech coated valves
-Supertech ti-retainers
-Bronze Valve guides

Each head we do also receives:
-Clean / Hot Tank
-Baked and soda Blasted
-Visual Evaluation / Inspection
-Vacuum tested
-Lubricated

 

[phillyb™]

this is relevant to my interests as my head is currently being ported and polished.
looks great!

 

[Bluegs03]

Hey are all of these 99 bp4w heads or have you experimented with any vvt 2001+ heads. Just curious with the differences you noticed inbetween them.

 

[Bob Loblaw]

This is nice. What's the damage on one of these?

 

[RenownMN]

For the port work and the valve job we offer 3 stages.

Street port: $600 3 angle valve job
Mild race port: $900 4 angle valve job
Full race port: $1200 4 angle valve job

parts are additional and we offer assistance in helping you choose the proper performance parts to ensure you get the best bang for the you buck!

We have not done to much with the VVt heads however we would love to get all up in one! lol. If interested please feel free to PM me.

 

[jux]

Nice!!

...and since I have a BP4W head itching for some minor work, at what stage/price point are things like gasket-matching and valve-deshrouding worked into the plan? If those types of services are part of your basic Street Port job, well, we might need to chat.

 

[RenownMN]

Well start chatting away buddy. Yes they are main premise of our street port.

Here is what is Standard procedures as well as what is included in the stage 2 (street port)
Standard Procedures
Disassembly
Degreasing
Media Blasting
Check Clearances
Check valve spring bind for camshafts
Check valve spring compression for OE valve springs
Set valve stem height
Set valve lash
Set valve spring install height
Reassembly

Street Port
Standard Procedures
Casting flashes removed
Polished exhaust ports
3 Angle Valve Job
Head Resurface

 

[90R]

For the port work and the valve job we offer 3 stages.

Street port: $600 3 angle valve job
Mild race port: $900 4 angle valve job
Full race port: $1200 4 angle valve job

got flow bench data for the port work?
are you using stones to cut the valve angles?

 

[Laguna96]

just out of curiousity, can you post the flow results from this? i'm porting my head at school but the thing is sometimes a mirror finish port isnt a good thing... the sand cast marks are often engineered to direct swirling vortexes and idle air pockets for certain performance aspects that when changed can actually decrease power/torque. they look great! i would just love to see flow numbers.

 

[1vicissitude]

Only sides that see polishing are the exhaust side and the chamber. You are correct, but that is about intake ports, not exhaust. A mirror finish on the intake side can cause atomization issues. On the exhaust side, or the chamber, a mirror polish can increase velocities, helps with carbon build up, and in the chamber can help fight detonation.

 

[Straitup D]

Looks good, is this for the blue car?

 

[RenownMN]

We didn't have an opportunity to have this Head tested. We will as we do the next one.

You guys are absolutely correct, and great observations. We do not polish the intake ever, nor do we go as big as possible As that can cause more harm than good.

The one thing to keep in mind is that CMF isn't always the best rule of thumb for measuring performance gains when porting something. Bigger is not always better. We apply our knowledge learned from schooling, trial, research and experience in the field.
We look more at how the air will flow in and out of the head. Focusing large amounts of attention to the short turn and overall shape of the ports, ie walls and floor roof. We also pay attention to what we can do to increase fuel atomizing opportunity's. We will work the ports to help divide the fuel evenly, reshape valve boss's and reshape the chamber to minimize fuel puddles. We want a increase of proper efficiency not just maximizing the air flow.

Also Straightup D this is not for the blue Miata, (Taras) we are building his block though. Pics of that will surface soon

This head was for our sponsored drift car in FL
Video of Sliding goodness here ---> CLICKY HERE TO WATCH SLIDING HAPPINESS!

 

[RenownMN]

Who wants port work. Super tax season special PM for info.

 

[Laguna96]

another question, why do you stop at 4-angle? isn't 3-angle and 5-angle standard for porting? in my experience 3-angle is standard re-surfaced, 5-angle is a nicely done seat, and "race-ground" seats are fully rounded off, but of course that requires a lot of maintenance...

that being said, do you do the 4th angle on the combustion chamber side or the inner port side? and any news on those airflow results?

 

[AngelsAndBombs]

I PM'd you regarding a head over-haul kit but this head work is sounding pretty nice. What is this "tax season special" ?