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Old 11-21-2014, 11:32 AM   #701
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Originally Posted by AndyHollis View Post
I strongly suggest you do NOT go 88mm bore on stock sleeves. Here's what happens when you track that for six months:
Was this the cause of your engine troubles during the most recent one lap or is this from an earlier engine?

Last edited by asmasm; 11-21-2014 at 12:28 PM.
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Old 11-21-2014, 12:43 PM   #702
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Was this the cause of your engine troubles during the most recent one lap or is this from an earlier engine?
Yes, that was the One Lap 2014 motor.

It was already sick (down on compression 8% in one cylinder) prior to the event. Just got worse and worse during. Massive blowby, too. Post event compression test showed down 25% in that cylinder and down 10% in adjacent one.

We had originally planned to run a different motor (fresh pro built shortblock) but that one had an oil leak which we did not have time to fix (turned out to be through the girdle)
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Old 11-21-2014, 02:13 PM   #703
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this is awesome
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Old 11-22-2014, 08:08 AM   #704
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Subscribed for updates... Was considering an ls swap but I'm on the fence now. Too bad I sold the k20/24 hybrid sitting in my shed a year ago :(
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Old 11-23-2014, 10:54 AM   #705
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Andy, you should do a dedicated build thread for your car.
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Old 12-12-2014, 05:26 PM   #706
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Just had a thought, why not use the 1.6 miata flywheel and clutch design for this? It would WAY simply the flywheel that you guys have to have custom made. Even a stock k24 is going to be a lot of engine for the stock 1.8 clutch to handle so you're already into having to use aftermarket clutches. Might as well save weight and MOI by using the 1.6 stuff and make the flywheel easier to boot.
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Old 12-12-2014, 07:15 PM   #707
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Just had a thought, why not use the 1.6 miata flywheel and clutch design for this? It would WAY simply the flywheel that you guys have to have custom made. Even a stock k24 is going to be a lot of engine for the stock 1.8 clutch to handle so you're already into having to use aftermarket clutches. Might as well save weight and MOI by using the 1.6 stuff and make the flywheel easier to boot.
It's spelled weigh. And more surface area makes a huge difference not having to put a stupid heavy pressure plate on a miata.
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Old 12-12-2014, 08:29 PM   #708
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Quote:
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Just had a thought, why not use the 1.6 miata flywheel and clutch design for this? It would WAY simply the flywheel that you guys have to have custom made. Even a stock k24 is going to be a lot of engine for the stock 1.8 clutch to handle so you're already into having to use aftermarket clutches. Might as well save weight and MOI by using the 1.6 stuff and make the flywheel easier to boot.
Good question, and one we considered. We decided to stick with the 1.8L setup for a few reasons:

1) Believe it or not, manufacturing cost was identical between the 1.6 and 1.8 style, due to the size of the piece of aluminum used to make the flywheel.

2) We recommend using a full 1.8 drivetrain to handle the additional torque of the K series, and most customers are using 1.8 cars anyway. Many already own an aftermarket 1.8 clutch so this helps keep their cost down.

3) we like the clutch options for the 1.8L better. Take the Exedy stage 2 clutch for example, which is perfect for a K24. the 1.6 stage 2 is only rated for 152wtq, but the 1.8 is good for 208wtq - perfect for NA K setups.
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Old 12-12-2014, 08:32 PM   #709
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I've been looking for some build threads on these but haven't turned up much. I sure hope they start popping up soon so I can get reading and learning!
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Old 12-12-2014, 10:18 PM   #710
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Quote:
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It's spelled weigh. And more surface area makes a huge difference not having to put a stupid heavy pressure plate on a miata.
weigh simplify the flywheel doesnt make any sense.

The racers who arent running twin disks or anything else with a non-standard flywheel seem to favor the 1.6 flywheel even if they're making big boy horsepower like bundy. Getting a heavier pressure plate is a good thing on the miata, the stock plate is just way too soft of a pedal. Even my 300ftlb rated clutch has a lighter pedal than I would prefer in a racecar its nice on the street though.
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Old 12-13-2014, 06:28 AM   #711
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That heavy pressure plate isn't nice on the thrust bearings though.


Oh and I got a picture from Kmiata of this,
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Old 12-13-2014, 12:02 PM   #712
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I've been looking for some build threads on these but haven't turned up much. I sure hope they start popping up soon so I can get reading and learning!
Shut up and buy one so I can build it.
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Old 12-13-2014, 02:48 PM   #713
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That header is a circus and a masterpiece at the same time.
Anybody wanna buy a K24 off me? I can't get away from a 1.8BP. I have wayyy too much BP stuff sitting around.
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Old 12-13-2014, 03:00 PM   #714
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Quote:
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Shut up and buy one so I can build it.
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That header is a circus and a masterpiece at the same time.
Anybody wanna buy a K24 off me? I can't get away from a 1.8BP. I have wayyy too much BP stuff sitting around.
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Old 12-13-2014, 03:16 PM   #715
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Quote:
Originally Posted by hornetball View Post
Andy, you should do a dedicated build thread for your car.
Quote:
Originally Posted by turbofan View Post
I've been looking for some build threads on these but haven't turned up much. I sure hope they start popping up soon so I can get reading and learning!
As I mentioned in my first post: www.OneLapMiata.com it's a Facebook page but you don't have to sign in to view. Follow along.

Here's a teaser: Name:  5CF75143-59D3-4314-BC07-D8823C10A615_zpshrcwwkma.jpg
Views: 26
Size:  172.0 KB
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Old 12-13-2014, 03:19 PM   #716
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It looks like a Suzuki cappuccino 3 cylinder in there, compared to a BP with all the crap on it.
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Old 12-13-2014, 03:23 PM   #717
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It looks like a Suzuki cappuccino 3 cylinder in there, compared to a BP with all the crap on it.
Intake manifold will fill the void...at least the one's I'm looking at.

Custom plenum style by either Hayward or Xcessive...or ITBs with custom airbox.
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Old 12-13-2014, 04:05 PM   #718
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Itbs with k&n sprint car airbox is the route I will be taking mine.

60mm kinsler's with 12" runners
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Old 12-13-2014, 04:47 PM   #719
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I think it looks at home in it's natural habitat.

Forgot I snapped this at the Dyno Day last month.

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Old 12-13-2014, 05:09 PM   #720
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It fits so nicely, just looks like its backwards.
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