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-   -   Rebuilding NA engine anything else I should add while it's apart? (https://www.rx7club.com/2nd-generation-specific-1986-1992-17/rebuilding-na-engine-anything-else-i-should-add-while-its-apart-608082/)

Ljk619 12-27-06 12:32 AM

Ichaidez, it's pretty much like in my first post a few things listed would be:

-Rebuild Kit which is pretty much the seals springs and you name it for the internals of the engine
-Gasket Set which is for the rest of the stuff external
-Lapping all four sides of the Side and Intermediate Housings
-Two new Turbo Housings (current ones are shot)
-Porting on the new housings (Exhaust and Intake)
-One "Very Good Used Rotor" as one of the Mazdatrix employees told me
-Main and Rotor Bearings

All that comes out to a ballpark figure of around $3k...

The rest of the rebuilding is being done by me.

Also anyone that has experience with Mazdatrix porting, when they quote me $290 for porting the Intake and $90 for porting the Exhaust, is that a street port or bridge port? I'm not too sure on the difference of the two, I'll go look that up. And exactly how much gain should I be looking at through just the porting? Maybe Higher RPM operation? I don't know...

Ljk619 12-27-06 12:33 AM

O and another thing I bought the Engine Stand Adaptor so tack on another $100 for whoever is doing the math.

RX7Tuner. 12-27-06 03:58 PM

For $290 Mazdatrix is going to give you a streetport. It isn't very aggressive but it will be a noticible difference over stock. They will enlarge all six of the intake ports. I forgot what year we are talking about but you should make about 15% more horsepower from a good streetport.
Your RPM operation will remain the same. Don't go over 8,000.
If you are going to assemble this motor by yourself I think you should pay the $20 and buy a rebuild video from either Mazdatrix or Rotary Avation.

Why are you using brand new rotor housings? I guess if you're will to pay an arm and a leg it's worth it but I bet half you rebuild costs are in those two housings.

lchaidez 12-27-06 05:40 PM


Originally Posted by Ljk619
Ichaidez, it's pretty much like in my first post a few things listed would be:

-Rebuild Kit which is pretty much the seals springs and you name it for the internals of the engine
-Gasket Set which is for the rest of the stuff external
-Lapping all four sides of the Side and Intermediate Housings
-Two new Turbo Housings (current ones are shot)
-Porting on the new housings (Exhaust and Intake)
-One "Very Good Used Rotor" as one of the Mazdatrix employees told me
-Main and Rotor Bearings

All that comes out to a ballpark figure of around $3k...

The rest of the rebuilding is being done by me.

Also anyone that has experience with Mazdatrix porting, when they quote me $290 for porting the Intake and $90 for porting the Exhaust, is that a street port or bridge port? I'm not too sure on the difference of the two, I'll go look that up. And exactly how much gain should I be looking at through just the porting? Maybe Higher RPM operation? I don't know...

*LChaidez
I see, Thanks for taking time and explaining it to me. Good Luck, and if its possible can you take pictures of the progress and post them here. I would like to see it. Thanks again, and good luck!!

Ljk619 12-27-06 08:25 PM

The housings that came with the engine are shot to hell. It's been rebuilt once and whoever did the rebuild reused the original housings so there's a huge groove on them. So ultimately I'll have to replace two housings anyways and the price difference between the NA housings and Turbo housings are a mere $50 or so. Thus I figured might as well go with the Turbo housings and port it while it's all apart which means dropping about $300 more. All in all not that big of a dent compared to what I'm paying already just to get the engine in good running condition.

Hopefully with that extra 15% and whatever I decide to put into the car it'll be in great running condition when I'm done with it.


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