Just got them back from Yaw Power yesterday from getting resurfaced. These suckers are beautiful. Definately worth the $250... All the port work was done by myself.

 

another..

 

last one for now.

 

VERY nice.

I usually put valve grinding paste between two irons and rub them like crazy during a rebuild.. Works GREAT to remove surface scars..

What did you pay for that jobber?

 

More details! Did he lap the irons, re-nitride them, what?

Those look GORGEOUS.

Dale

 

Did you use a stencile to do the porting? Loosk amazing. Thats what I wanted to do from the get go but then we just decided to get a rebuilt reman instead.....Sad....to think I could have had a bridge port

 

those things look like new, 250 dollars for both? thats a damn good price. Whats the web site for them?

 

Mazdatrix also laps housings for $60 per surface which comes out to $240 per engine

 

Ha.. I missed the price.. D'OH! Nice - definately worth it!

 

Their site is yawpower.com. Included in the $250 is a very extensive cleaning then they are resurfaced. This page shows the process quite well: http://www.yawpower.com/eb01t.html..

Here's a good description taken from their site:

Housings are ground flat, and then lightly lapped to provide a minimum surface finish of 15rms measured across the grain.
We prefer grinding to lapping for 2 reasons.

1. Grinding insures that the opposing surfaces remain parallel. Lapping provides a flat surface, but does not have a mechanical reference to the opposing surface. Grinding involves mounting the housing to an electromagnet which is parallel to the grinding wheel travel so that dimensional accuracy is maintained.

2. A housing that is lapped mirror smooth will have little or no oil retention. This is clearly illustrated when applying assembly lube to a mirror finished housing. Rather than spreading evenly across the surface, the lube will bead up much like water on a freshly waxed car. Our process leaves some grain intact to hold oil on the surface, and the light finish lap flattens the top of the peaks insuring that the seals have a smooth finish to ride on. This approach is more time consuming, and so more expensive, but has proven to us to give the best housing and seal wear, along with a quick break in period.

Dale, they take less than a thousandth off so there is plenty of nitride material remaining.

Xeros, I made my own template for the ports and thanks for the comments!

 

Sweet!

 

Looks Sweet!

 

They actually resurface all of their new housings with the same process b/c they feel it is a better finish...

 

looks tasty Good job

 

NEXT REBUILD I AM GOING THE SAME WAY! Only I hope thats not anytime soon.....

 

Cool, that is a way good thing to know. I'm amazed how CLEAN they can get the irons - it's REALLY hard to get the corrosion out of the water jacket! Not to mention it's MUCH easier to inspect a clean housing for damage - dirt and corrosion can hide damage many times.

Dale

 

Did you have them flow test your ports with their flow bench while they had your housings? Oh what did the shipping run you for all the housings?

Edit: Nevermind about the shipping. I just realized that you live in the same state.

 

Nice porting, that thing is going to be a chugger for sure.

I can hear it already,

Brap, Brap, Brap..

Post a sound clip once you get it up and running.

 

Will do. I shoulda had my buddy put them on the flow bench, but they have been pretty busy over there, so I didn't want to bother them too much.

 

PMed you ...

 

wow, haven't heard of those guys before, but after browsing their website...damn I'm impressed!

 

me too, nothing sounds better that a bridge port at idle

 

DITTO !!