1vicissitude

http://www.k20a.org/forum/showthread.php?t=92965


Okay well people have swapped the k24 into s2000s, and people have swapped the f20c into miatas, so by natural progression this swap makes sense.

With these things hitting 230-350 whp on pump gas with varying mods, this is pretty damn cool.

Anyone have any new information on this? Very expensive swap. Should be a lot of fun. A f20c would be much easier and cheaper. I have seen them on CL for <3k quite regularly. Either way it would be nice to have an engine that actually makes some good power.

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bigx5murf

convert a k series to rwd? Why bother w/ the extra complexity? Just f20c it. Unless you've got that much extra money you need to burn away.

Conundrum

Some guy swapped it into his S2000, then turbo'd it. It's cool but sounds really expensive.

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1vicissitude

I'm not, k-tuned eludes that it's in the game book. Just seeing if anyone had some info on it. Either engine is light years ahead of our current slugs.

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Bob Loblaw

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robertw

I'm assuming these swaps aren't cheap but if the cost approaches anything in the $8-10k range, why not just put an ls1 in the car? Don't get me wrong, I love the k series, but I'd rather have 8 cylinders lol. Same goes with people swapping the sr20 in, why?

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07 Civic Si :: 96 Miata :: 02 SV650
My SV650 Street Fighter Build

djsqiigles

That is the most American thing i've ever read.

Kolbotn

This^^

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92' 1.6 Silverstone NA

RustyNWeathered

For some reason alot of import ppl are import and nothing else. They dont even admit or like corvettes or any american sports car that is good. I have friends that just hate v8s..for no reason

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I wanna rock you like the 80s

robertw

Haha sorry if I offended anyone with my last post, I just fancy v8's in small cars.

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07 Civic Si :: 96 Miata :: 02 SV650
My SV650 Street Fighter Build

1vicissitude

I like v8s, but the idea of throwing an engine in that weighs 100lbs less and has twice the horsepower sounds awesome. I'd love to see a f20c miata face off against a k20 crx.

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ComicArtist

Yeah, cause they're USDM as fuck

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1978 Datsun 280z - L28ET swapped
1990 Mazda Miata

terry pham

I would do whatever gets better gas mileage... for your intended purpose... 300hp vs 500hp

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spd579

I already have one k20(in my type-S), I'd buy another miata if there was a kit to drop one of these in it. Rotrex the k20 and be pushing 450whp like cake on 93 stock block.... Only reason I dont boost the k20 I've got now is bc it's FWD and can't put the power down.

DazedAndConfused

My friend has a K20 GT35R powered MR-S, and he STILL can't keep the power down even with it RWD. He's hacking away on the body to mount flares for big as shit rubber. lol

1vicissitude

That sounds awesome Dazed, any pics? He should just get the 15x10 6uls and 275 hoosiers with that type of power. Even that might not be enough though.

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DazedAndConfused

I'll take pics next time I go to his house. His driveway consist of all project cars and he DD his NSX. lol

1) Cressida that he is working on making a mid engine twin turbo tube chassis
2) K20 GT35R MR-S
3) Boosted NSX
4) Boosted 1UZ 280Z flared and dropped.
5) RSX Type S (getting body work)

DazedAndConfused

Heres a pic of like a quarter of his driveway and garage in the background. You can see the RSX and the 280Z in the air along with his gigantic stack of tires. His garage is a dream of parts. Turbo's galore and so many awesome parts just laying around. I'm so jelly

coupeloop

wheres the cross burnin' at tonight??

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Believe.

Diamond Dave

A) Engine cost is not a reason to justify a hybrid conversion.

B) Horsepower is not the measure of which hybrid engine conversion is "best".

C) Any hybrid engine swap is neither inexpensive nor an intelligent solution.

Tip14

Would be a good idea, but.... Lots of work and money involved I like Bob Law's picture it about sums it up lol

1vicissitude

Again never said it was cheap. However swapping a k20 or f20 makes more sense for someone with a 200whp NA 4 cylinder goal. The k20/f20 engine stock with a tune will make more then our BP will ever make, and it will do it with OEM reliability. Try to say the same for a 12:1 stroked BP with a 9k redline. Different strokes for different folks. I'm not against a v8 swap anyways. I am however open to new ideas and vendor support. Specially when a k20/f20 powered miata is a thing of beauty.

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spd579

Just got off the phone with K-tuned, said they've threw the idea around but nothing is in the works. I told them to get on it!

spd579

A) Why the F not? if it makes good power(k series do)
B)?? What do you measure a good engine by? Besides Efficiency I cant think of anything that ranks higher
C) It may not be cheap but I can think of at least 10 engines that would be better than the bp and b6 engines....

Diamond Dave

In your world maybe. Honda has some great engines for sure. How does it sit in the Miata engine bay? what does it do to the balance? do you care about using the PPF? Have you moved the steering rack or shim the subframe? All those things affect the outcome so that HP means less than the total driving package.

Not everyone shares the same goals. My SR20 Autech makes stock 200hp NA, but that doesn't make it a "smart" engine choice. It was for my needs as we can use the PPF, we don't have to move the steering rack, nor do we need to shim the subframe and it sits lower and closer to the firewall to boot. It will fill the gap in time until I decide that I'd like a reliable 350WHP from a mild SR20det. V8's are cool and I've got nothing against them, I'm just not sure that's a swap for me.

Amen brother.



A) Hybrid swap costs are hidden in the large pile of $100 parts.

B) because there isn't one "right" engine. They're all a bad idea that happen to make more HP than a BP.

C) Nothing changes the fact that on a dollar to hp ratio, very few hybrid engine swaps can compete with the cost effective results that a turbo kit on a BP gives the Miata; about 60=70% of the performance of a V8. Anyone choosing NA for "purity's sake" is just screwing around or making up excuses (like me). The people with turbo Miatas that have turbo problems fall into 2 categories typically: 1) too cheap to buy a proven kit so they cobbled something together 2) trying to get more HP out of the package by sacrificing reliability.

mazdaze

Yeah? Well so is the 00' Honda Civic Si that wanted so bad to race me this morning. Whats your point?

spd579

Just so you know, I have a k20 and a flawlessly built BP, the BP cost about 12k for parts and labor to be built and I'll only be pushing ~450whp max rated a ~550 max. I can buy a stock k20(lighter than any BP) that would easily make that power(stock) for probably under 2k. I believe someone could make up the difference somewhere in there and even easier with other powerplants.

Dave P

12k for a built bp plus labor?
ill make a list with the highest prices ive ever seen

BP block-500
built and worked head- 3k if you do the whole kit
carillo rods-1k
fm pistons-900
motor work-1500
bearings-200
misc stuff like gaskets-500
boundry oil pump-500

factor in fuel rail pump blah blah blah maybe 10k for every thing you need for a built boosted tuned 300whp miata. thats the high side. i see no point in a $10k swap that will net you 200whp and a dismal 140ft/lbs tq when for the same price you can have a little monster of a bp with a large snail friend next to it for around the same price

1vicissitude

Can be way more expensive than that. FM or Mahura strokers are ~5k with no machine work.

So say 5,000 for a stroker, 1,500 associated machine work, 3,000 on a head and valvetrain, 700-1100 for cams... See how fast it adds up?

It really just matters on your power goals. A BP built to be the absolute best it could be is still going to be displacement limited. 2.1L is the max it'll go. A stock f22c will do everything a high dollar built BP will do for the 3k they can be bought for. The f22c is easily replicated in the chance of a blown engine, and has oem reliability. A BP built to run 8.5k+ rpms that is stroked to 2.1L will not be a long lasting engine. for the cost of the built BP you could easily have a shop install a f22c.

A mildly built BP and a turbo is cool, but there comes a point where building one further doesn't make sense unless limited by class rules.

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Diamond Dave

Great, do the conversion, keep track of the costs and come back to let me know how wrong I am.

For the record, I think it's great that you want to do this conversion AND show everyone how inexpensive a hybrid engine swap can be. Come back to post pictures.