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Old 01-09-2013, 12:07 AM   #1
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Default Terrible news

so im not sure this is the right section but i think it will do.
i have a 1990 miata ive been modifing for about a year. i put all fm suspension hawk break pads a 96 dash and a few other goodies.....i love the car but it seemed to be getting slower and slower latly???
So today im leaving work and its just dead slooooowww....i mean foot to the floor in first gear not going anywhere...so i check the timing and its wayyyyyy retarded.
i took apart the timing and front cover and found what i suspected. the crank key and broken and the crank gear is flopping around on the crank..:( :( :(
as i planned to be turboing this car in less than 2 months now its time to make a chioce.here are the options i see

1.swap in a 1.8L and call it a day and turbo that one
2. swap in a used 1.6 and turbo that (lnc this time)
3. sorce a crank and rebuild the motor i have
4. swap in a mazda speed 1.8 turbo...(this possable?)

what would you all do?

what would you all do with a bud
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Old 01-09-2013, 12:16 AM   #2
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A buddy of mine with a 1.6 constantly said that going to a 1.8 is a decent step up power-wise, and that a solid N/A 1.8 can be a potent autox engine.

That said, it's really up to you and depends upon your budget.

The mazdaspeed motor might be harder to find.
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Old 01-09-2013, 12:34 AM   #3
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Option 1
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Old 01-09-2013, 12:38 AM   #4
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the mazda speed motors are all over ebay for around $2k so if that swaps in easy that would be a decent deal i thought since by the time i buy a 1.8 swap that in and then add a turbo im looking at closer to $3500ish....
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Old 01-09-2013, 12:40 AM   #5
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Quote:
Originally Posted by Hahnlsquid View Post
so im not sure this is the right section but i think it will do.
i have a 1990 miata ive been modifing for about a year. i put all fm suspension hawk break pads a 96 dash and a few other goodies.....i love the car but it seemed to be getting slower and slower latly???
So today im leaving work and its just dead slooooowww....i mean foot to the floor in first gear not going anywhere...so i check the timing and its wayyyyyy retarded.
i took apart the timing and front cover and found what i suspected. the crank key and broken and the crank gear is flopping around on the crank..:( :( :(
as i planned to be turboing this car in less than 2 months now its time to make a chioce.here are the options i see

1.swap in a 1.8L and call it a day and turbo that one
2. swap in a used 1.6 and turbo that (lnc this time)
3. sorce a crank and rebuild the motor i have
4. swap in a mazda speed 1.8 turbo...(this possable?)

what would you all do?

what would you all do with a bud
If you didn't see the red under the words misspelled.
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Old 01-09-2013, 12:45 AM   #6
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using cell phone no spell check...sorry im not a spelling guru....just a mechanic.
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Old 01-09-2013, 08:01 AM   #7
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Why on earth would you swap a 96 dash into a 90? The 96 dash is a good 20lbs heavier. Everyone I know does the exact opposite. Swap a 90-93 dash into a 94-05 Miata.
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Old 01-09-2013, 09:08 AM   #8
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Go with option 1. The msm motor is just a 99 motor with a shitty turbo system.
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Old 01-09-2013, 09:31 AM   #9
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Quote:
Originally Posted by TNTUBA View Post
Why on earth would you swap a 96 dash into a 90? The 96 dash is a good 20lbs heavier. Everyone I know does the exact opposite. Swap a 90-93 dash into a 94-05 Miata.
I could understand putting an NB dash in it since people say those are "nicer" and are actually double din rather than 1.675433456 din like the NA IRRC. But putting in an a 94-97 dash makes no sense.

Last edited by Leafy; 01-09-2013 at 09:45 AM.
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Old 01-09-2013, 09:41 AM   #10
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1) The MSM mirror IS NOT just a 99-00 motor
2) The OP didn't say anything about a NB dash...or did I miss something?
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Old 01-09-2013, 10:01 AM   #11
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Quote:
Originally Posted by TNTUBA View Post
1) The MSM mirror IS NOT just a 99-00 motor
I know they are not identicle but to my knowledge the differences are minute.

I could have sworn the only real differences were the cam and the fact that it is plumbed for turbo lines already. I own one so I would like you to open my eyes if there is something I am missing that actually means anything.
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Old 01-09-2013, 10:11 AM   #12
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It's the cam, the intake manifold and that Oil Filler cap. I was mostly being an ***. There are differences that make it "not just a 99-00."
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Old 01-09-2013, 10:29 AM   #13
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Swap in a 1.8 and boost it.

Use the left over money for English classes.

Yer Inglesh iz, Terable.
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Old 01-09-2013, 10:43 AM   #14
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Yer Inglesh iz, Terable.
I lol'd.
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Old 01-09-2013, 11:09 AM   #15
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Just swap in a regular 1.8. They are $500 complete from local junkyards. Better deals are probably around.

Boneeater Springs, FL, huh? That's about 15 miles from Cape Oral, if I recall.
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Old 01-09-2013, 12:16 PM   #16
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18psi beat me to it but I'll have a go anyway:

"Terable news.............I ---- spel nd my grmmar is awfull to
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Old 01-09-2013, 12:22 PM   #17
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Quote:
Originally Posted by TNTUBA View Post
It's the cam, the intake manifold and that Oil Filler cap. I was mostly being an ***. There are differences that make it "not just a 99-00."
And the pistons, and the crank girdle, and differences in the head (cooling jackets), and the oil pan, and ...
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Old 01-09-2013, 03:32 PM   #18
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And the pistons, and the crank girdle, and differences in the head (cooling jackets), and the oil pan, and ...
First I've heard of this, go on... ?

Stronger pistons? Same rods right? It always sounded NOT worth it for the MSM motor swap to me.
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Old 01-09-2013, 05:12 PM   #19
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Didn't say they were stronger, I said they were different. BP4W pistons are 9.0:1 CR and MSM are 9.5:1.

Generally speaking, you don't get more power out of an MSM motor compared to the BP4W (you're limited by the rods either way), so it usually does not make sense to pay a premium that is usually demanded for the MSM motor.
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Old 01-09-2013, 05:23 PM   #20
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Quote:
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Didn't say they were stronger, I said they were different. BP4W pistons are 9.0:1 CR and MSM are 9.5:1.

Generally speaking, you don't get more power out of an MSM motor compared to the BP4W (you're limited by the rods either way), so it usually does not make sense to pay a premium that is usually demanded for the MSM motor.
pretty sure they're both 9.5
the bp05 is 9.0
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