something interesting on K-series

[mikeetown]

found this on probe talk.

August 16th, 2006, 12:00 AM #7
mx6gt04
Turbo Member

Join Date: Nov 2002
Posts: 1,652
The K8 bore is 85mm vs. 84.5mm of the KL (yes, awkward as it sounds the smaller engine has a bigger bore). The difference is the stroke.

The 1.8 and 2.0 V6 rods are itty bitty, worse than the 2.5. Ive compared them side by side. It would self destruct much easier, and that's pretty sad seeing how easy the KL rods bend and break....
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so, i always thought the K8's would be stronger than KL's at high revs (5000 - 7500 rpm).

??

[_-Night-Shade-_]

No. Comparing apples and oranges.

[Inodoro Pereyra]

Mike: that information is wrong. The K8 has a bore of 75 mm, not 85, and a stroke of 69.6mm.
The KF (2.0L) has a bore of 78mm, and the same stroke as the K8.
The KL has a bore of 84.5mm, and a stroke of 74.2mm.

[RX8SE3P]

Yep Inodoro is right, my sources also indicate it's 75mm x 69.6mm for K8

84.5mm x 74.2mm For the KL

Also when rebuilding my engine and having a spare K8 short block next to it, the pistons on the K8 look very tiny.

[Ryan]

When comparing my ZE and K8 pistons side by side, I would also have to definately agree K8 are 75 and KL are 84.5

[PATDIESEL]

I wonder if it is a mistake and they were looking at or measuring 4 banger parts... odd to be so confident and so off at the same time...

[Ryan]

... odd to be so confident and so off at the same time...

That's not odd at all, I think that's how countless misconceptions happen on forums... someone sounds like they know what they're talking about when the have no clue.

[Inodoro Pereyra]

I wonder if it is a mistake and they were looking at or measuring 4 banger parts... odd to be so confident and so off at the same time...

I have to say that, more than odd, I find it...sad...
There's no need to measure anything to get the right numbers. I didn't measure anything.

Just a 10 second google, and I found what I was looking for here:

http://en.wikipedia.org/wiki/Mazda_K_engine

...and here:

http://www.tsentraal.ee/mx6/engine/SAE920677.htm

...and I'm pretty sure that, had I not been satisfied, I could have found many more sources for the same data.

I agree with Ryan. That looks a lot more like the work of somebody who didn't have a clue what he was talking about, and didn't care to check his information before posting it, than somebody making just an honest mistake.

[mikeetown]

Well, i came across that and just had to post it for you Gou guys. good thing i did.