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wytbishop wrote:The theoretical power rating of the ZE engine is 198hp. So it probably puts 160ish to the ground in the majority of cases. The only way to make more power is to increase volumetric efficiency. That means get more air in and out of the engine. Improving the intake and exhaust is the easiest and most common way tot do that, but it will probably only get you 10hp. That being said I'm sure that there are guys out there putting 200 on the ground. These are the guys chasing every little gain. Knife edging the IM, boring the TB, flowing the heads, 3 angle valve grind and on and on.

No combination of heads, cams, valves, etc. will increase your engine's output beyond 170-180hp or so. I would call 180whp the best case scenario without some sort of in depth search for added hp. If you're doing the internals, you coupld bump compression but that would hamper future boosting efforts.

RX8SE3P wrote: Here's an engine bay pic. They look just like "curved neck ZE". How would you tell this apart from a 200HP curved neck? They look identical. Head codes are probably the same too. Would the cams be KL31? I guess if it was a ZE version it would have a 7 nipple disty and no EGR etc.

Here's a pics, they are found in Eunos 800

Slammed6 wrote: Intake Manifold- A KLZE Curve neck is identical to a US Millenia manifold when it comes to performance, BUT a US millenia manifold will have a EGR on the back center of the manifold.

Heads- They will be the same on both a True KLZE or US Millenia Motor. They will have a stamp on then KL-31 101 and KL-31 1A1

Distributor- 7 nipple Disty on KLZE, 6 nipple Disty on US Millenia Motor

Cams- They will be the same on a True KLZE or US Millenia Motor. Stamped KL-01

Pistons- A True KLZE will have the FLAT top 10:1 Compression Pistons, Where the US Millenia Motor will have the 9.2:1 KLDE Pistons

Heads- They will be the same on both a True KLZE or US Millenia Motor. They will have a stamp on then KL-31 101 and KL-31 1A1

RX8SE3P wrote:
So there is actually a 200HP (149KW) curved neck motor and a 170HP (125KW) curve neck motor too, which are not to be confused with a DE at all, which I would refer to as a 164HP (121KW) short neck motor. I had it in my head that the Millenia + Eunos 800 had about 170HP regardless if they were from japan or not. But it seems there is actually a 200HP Japanese engine with the curved neck intake? Is that right?

RX8SE3P wrote:So there is actually a 200HP (149KW) curved neck motor and a 170HP (125KW) curve neck motor too, which are not to be confused with a DE at all, which I would refer to as a 164HP (121KW) short neck motor. I had it in my head that the Millenia + Eunos 800 had about 170HP regardless if they were from japan or not. But it seems there is actually a 200HP Japanese engine with the curved neck intake? Is that right?

Are we sure on that. Aren't they stamped KL and not KL31? If that was the case, and with square runner IM/Heads, you could easilly and fool 99.9% of people that that it's a DE and not a ZE

mazdamx3freak wrote:3 pages on this, come on? really? straight neck ZE is the only one that will have kl31 cams in it

Mooneggs wrote:

mazdamx3freak wrote:3 pages on this, come on? really? straight neck ZE is the only one that will have kl31 cams in it

sorry to disagree... my ze came with a straight neck and kl01 cams.

Mad Cow wrote:Is it weird that 1 of my heads is stamped KL31-1A1 and the other is KL31-101? Are the 101 and 1A1 used to differentiate the front and rear heads?

RX8SE3P wrote:

Mooneggs wrote:

mazdamx3freak wrote:3 pages on this, come on? really? straight neck ZE is the only one that will have kl31 cams in it

sorry to disagree... my ze came with a straight neck and kl01 cams.

That's not very common, in fact I have not ever heard of that before. Is it at all possible someone had it previously and swapped the curved neck into a straight neck?

RX8SE3P wrote:

Mad Cow wrote:Is it weird that 1 of my heads is stamped KL31-1A1 and the other is KL31-101? Are the 101 and 1A1 used to differentiate the front and rear heads?

No that sounds pretty much right. Mine are the same.

mazdamx3freak wrote:3 pages on this, come on? really? straight neck ZE is the only one that will have kl31 cams in it so get a straight neck ZE + millenia IM = best combo setup n/a factory. or buy a us millenia and get n/a full race colt cams, done!