Why aren't miata engines so good for all-motor power?
#1
Why aren't miata engines so good for all-motor power?
When people build Hondas they make these high revving stroker engines with cams and such, and make ridiculous amounts of n/a power, but usually when people want fast miatas they put a turbo on it, else they do a K swap. What makes Honda engines different? How much power can you make from a miata n/a?
Not sure if this is the right thread. But i was thinking about this lately. Considering buying a Honda just for the experience and fun tuning something different.
Not sure if this is the right thread. But i was thinking about this lately. Considering buying a Honda just for the experience and fun tuning something different.
#3
When people build Hondas they make these high revving stroker engines with cams and such, and make ridiculous amounts of n/a power, but usually when people want fast miatas they put a turbo on it, else they do a K swap. What makes Honda engines different? How much power can you make from a miata n/a?
Not sure if this is the right thread. But i was thinking about this lately. Considering buying a Honda just for the experience and fun tuning something different.
Not sure if this is the right thread. But i was thinking about this lately. Considering buying a Honda just for the experience and fun tuning something different.
#8
Melody,
165whp on E85 is about the limit for cost effective power. N/A BP's don't make serious power without huge cams. Even then a junkyard K24a2 will embarrass it. The funny thing is that N/A power is all cams. You can put a stupid huge set of cams in a bone stock BP4W with nothing more than stiff valve springs and make 185whp on E85..briefly. Madjaks engine is highly developed and just matches the junkyard K24A2 with a header. The difference is the K24 will last like 200hrs.
We have put together maybe a dozen 150-170whp BP track cars in the last 12 years. Only one 8500rpm, 200whp, ITB 2.0L. That car was fun but made no sense in any context.
Then there are turbo BP's. The current record is something like 650whp in a drag motor. But 400whp track builds that have 50+hrs on them are almost commonplace. That full race 400whp BP cost only 2-3k more than a K swapped anything. That the 400whp BP can just about be ordered off a website or two and just bolted together furthers it's position as the preferred option.
There is a reason this forum is named so.
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#11
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I've always been puzzled by people who, absent any rules-limitations, elect to build insane naturally-aspirated engines.
If you're doing it just for the sake of doing it, then I can respect that. That's Hackaday.com kind of stuff.
But if your goal is to wind up with a car that's daily-driver-friendly yet also insanely fun when you have some open pavement in front of you, and you're working with a 4 cyl chassis, then it just makes no sense to ignore forced induction.
If you're doing it just for the sake of doing it, then I can respect that. That's Hackaday.com kind of stuff.
But if your goal is to wind up with a car that's daily-driver-friendly yet also insanely fun when you have some open pavement in front of you, and you're working with a 4 cyl chassis, then it just makes no sense to ignore forced induction.
#12
I've always been puzzled by people who, absent any rules-limitations, elect to build insane naturally-aspirated engines.
If you're doing it just for the sake of doing it, then I can respect that. That's Hackaday.com kind of stuff.
But if your goal is to wind up with a car that's daily-driver-friendly yet also insanely fun when you have some open pavement in front of you, and you're working with a 4 cyl chassis, then it just makes no sense to ignore forced induction.
If you're doing it just for the sake of doing it, then I can respect that. That's Hackaday.com kind of stuff.
But if your goal is to wind up with a car that's daily-driver-friendly yet also insanely fun when you have some open pavement in front of you, and you're working with a 4 cyl chassis, then it just makes no sense to ignore forced induction.
#15
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Ive seen some K series bored and stroked way out so theyre like 2.6L or more, running methanol, making ~500hp. Theyre also drag racing grenades Id imagine.
But to the OP, this tells the whole story:
BP:
B16:
K20A flows better stock than a race ported B16 head. This is why they make big power so effortlessly. All you have to do is build it to support the RPM, throw wild cam profiles at it, and you get all the power.
But to the OP, this tells the whole story:
BP:
B16:
K20A flows better stock than a race ported B16 head. This is why they make big power so effortlessly. All you have to do is build it to support the RPM, throw wild cam profiles at it, and you get all the power.
#17
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I've seen those photos before. Something about them has always bothered me, and I just figured it out.
In the Honda cutaway, the slice has been made right through the middle of the vale-guide bores. This means that the ports have been sectioned at their widest point, presupposing that they are roughly circular and also co-planar with the valve stem.
In the Mazda cutaway, you can't see any of the valve-guide bores. This suggests that the cut is not through the center of the ports.
Or, put visually:
I'm not disagreeing that the port design in the Mazda BP-series heads is sub-optimal, but those photos seem disingenuous to me.
In the Honda cutaway, the slice has been made right through the middle of the vale-guide bores. This means that the ports have been sectioned at their widest point, presupposing that they are roughly circular and also co-planar with the valve stem.
In the Mazda cutaway, you can't see any of the valve-guide bores. This suggests that the cut is not through the center of the ports.
Or, put visually:
I'm not disagreeing that the port design in the Mazda BP-series heads is sub-optimal, but those photos seem disingenuous to me.