DOHC B6 Information

[shorestiva]

eh not really. I can do it but I've only put one of the "Advanced" setups together so I may not get everything right. I'd prefer to do a straight cash deal.

[FoMoCoMotion]

Joe & Charlie, would either of you be interested in the 1.5L rotating assembly as a partial trade towards a custom strut / shock combo? Thinking of using the 1.6L rotating assembly for ease of replacement parts.

[ihasmiat?]

Awesome, please any and all information on it would be appreciated. I already read your post about shaving part of the distributor, idle valve (which I don't need here in Florida) bypassed that on my first 1.6 miata.


Where are you located? If your in Florida I'd love to come hangout and work on some cool festivas?


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[Advancedynamix]

Read it in the first post, that you can run the b6ze with the stock b3 festiva ecu. But haven't been any to find any detailed information.

Any links or DIY threads I might be over looking?

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I don't think anyone has posted a DIY or a real detailed thread on it. I'll be doing the swap shortly, I'll post up the specifics. I've never done it personally, but I've driven 2 cars with this setup and can say first hand that it works good.

[ihasmiat?]

Read it in the first post, that you can run the b6ze with the stock b3 festiva ecu. But haven't been any to find any detailed information.

Any links or DIY threads I might be over looking?

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[Advancedynamix]

Yeah, carb dip is pretty amazing. Don't get it on your hands though, it's a pretty potent neurotoxin.
The ZLde crank has smaller big end I.D. than the B6d too. I haven't mic'd them yet. They look like the same size bearings as the b3 though.

[FoMoCoMotion]

The big end bore of the B6-ZE rod bore is also larger than the B5-ZE's. My El-Cheapo Harbor Freight gauge measures the B6 at 1.89" and the B5 at 1.69".


PS - It's amazing how well Berryman Chem Dip works to clean up varnish.

[Advancedynamix]

Is this the vent location, the hole on underside of alternator mount?

My ZLde has the same block as that late B6d. Here is what it looks like inside the cavity that this hole goes into.

It's just a cavity, made by the oil pump housing and the block.

[Dragonhealer]

Thanks for the info guys. Seems I have a lot to learn about these little beasts! Growing up in rural Wilkes Co. NC (the birth place of stock car racing) I never really understood the drift scene. As a kid racing go-karts and such it seemed the goal was always looking for traction and corner speed; the exact opposite of drifting
I tore down one of the Miata motors today and noticed another difference between the B6-ZE and B5-ZE engines. The B5's pistons are pressed-on style and the B6's use circlips to hold the wrist pins in. The B6 also has an oil drain / vent tube in the back that you had pointed out earlier in this post. Which style is preferred, Pressed or floating?

serious engine builders use full floating wrist pins. You will need bushed rods. Pistons can be machined for retaining clips or sourced from an engine that uses full floating pistons.

[FoMoCoMotion]

B6-ZE on the Left B5-ZE on the right

[FoMoCoMotion]

Thanks for the info guys. Seems I have a lot to learn about these little beasts! Growing up in rural Wilkes Co. NC (the birth place of stock car racing) I never really understood the drift scene. As a kid racing go-karts and such it seemed the goal was always looking for traction and corner speed; the exact opposite of drifting
I tore down one of the Miata motors today and noticed another difference between the B6-ZE and B5-ZE engines. The B5's pistons are pressed-on style and the B6's use circlips to hold the wrist pins in. The B6 also has an oil drain / vent tube in the back that you had pointed out earlier in this post. Which style is preferred, Pressed or floating?

[Advancedynamix]

I just scored 3 Miata engines today for a song. One supposedly has a rod knock, one he said was a smoker and the other had sat outside and was in "unknown" condition. The guy I picked them up from in Charlotte is into the drifting scene and says they all prefer the BP engines. Doesn't the B5 and B6 engine have a better rod ratio?

Yeah. The Miata requires more TQ than a Festiva, so the BP is a better choice, unless you're going to run the engine at over 6400rpm for long. Even the B6 rod ratio is not ideal, but it's better than the BP.
Our cars should not be set up like a miata, if you want to make the most of the chassis. We don't need nearly as much low end TQ. Low end TQ is important when you're learning to drift a RWD car. However, we want to focus heavily on maintaining traction with our drive wheels. Whether you want to drift a Festiva or just enjoy a spirited drive, front wheel traction is necessary.
Out here all the serious drift guys are just swapping V8 engines into their cars.

[shorestiva]

Yes but supposedly the b6 head/intake/cam combo flows a lot worse so everyone wants to swap to a bp. Plus the extra displacement for faster spool. The accepted way for a big power build on miataturbo is vvt bp with rods, pistons, flat top intake manifold, e85, aftermarket crank damper, billet oil pump and a efr turbo hooked up to the miata 6 speed. The trans aren't holding up well at over 300-350tq though.

[FoMoCoMotion]

I just scored 3 Miata engines today for a song. One supposedly has a rod knock, one he said was a smoker and the other had sat outside and was in "unknown" condition. The guy I picked them up from in Charlotte is into the drifting scene and says they all prefer the BP engines. Doesn't the B5 and B6 engine have a better rod ratio?

[william]

^+1 finding capris around here is getting really hard. And miata engines go for to much.