Miata Crank Pulley, WTF is the story here? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 06-24-2016, 12:19 AM   #1
Junior Member
Thread Starter
 
Join Date: Nov 2015
Posts: 157
Total Cats: 10
Default Miata Crank Pulley, WTF is the story here?

So i've looked all over and seen conflicting answers to this. I know alot of guys here run the supermiata damper on the 1.8 motor so I'm looking for an answer to put my brain to rest.

My car is a '92, and I'm putting in a built 1.8 from a '96. I believe I have my timing set...verifying the timing marks on the cam gears are right, first lobe on the intake cam is pointed 9 o'clock and the first lobe on the exhaust cam is point 3 o'clock, 19 teeth between the top marks on the cam gears, and the lower crank gear "half moon" pointed up at the arrow on the oil pump. I'm about to put my supermiata damper on, so I marked the two notches on the damper with orange and white paint as seen in the pics.

My confusion is that the left mark lines up with the "T" TDC mark, and the second notch to the right is off the scale. On most of the two notch dampers I've seen, it has the left notch at the left 10 BTDC and the right notch at T. I've heard that it's different on 95 motors, 96/97 is the same as 94, etc etc.

The last pic is me placing the OEM damper up there so you can see that the two notches on that damper also reside in the same location as they do on the supermiata.

So what's the story here? Are those notches where they should be? I have a feeling like once the car is started then you would modify timing to get the orange dot at 10 and the white dot at T....does this sound right? If I fired the car up would i see the orange mark reading on the scale to the left near 10, or would I have to assign a fixed timing value in tunerstudio to set base timing?

Here's a link i found around this question, but it's the only one i could seem to dig up. http://www.mazda-speed.com/forum2/in...c,26758.0.html

Thanks in advance.









Attached Thumbnails
Miata Crank Pulley, WTF is the story here?-80-damper1_89ed5ddbd225b753df443886b5c2b3479fa38c88.jpg   Miata Crank Pulley, WTF is the story here?-80-damper2_64241c3f1731f1e1b4e6f8e718b4a8482be02b66.jpg   Miata Crank Pulley, WTF is the story here?-80-damper4_8cc69473e173c076ec618312564e7009f63315b4.jpg   Miata Crank Pulley, WTF is the story here?-80-damper3_56cb8d678806a3eaae860913ec2a94e3d2bd1002.jpg   Miata Crank Pulley, WTF is the story here?-80-damper5_f3c6f4a342efd30fc59c04d85f7d931afa27ba86.jpg  


Last edited by OGWar; 06-24-2016 at 12:48 AM.
OGWar is offline   Reply With Quote
Old 06-24-2016, 12:46 AM   #2
Senior Member
iTrader: (2)
 
williams805's Avatar
 
Join Date: Oct 2013
Location: Goleta, Southern California
Posts: 510
Total Cats: 25
Default

You're good. When running and a timing light on there, that red mark will line up with the 10 on the timing marks (stock ecu).
williams805 is offline   Reply With Quote
Old 06-24-2016, 01:03 AM   #3
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,093
Total Cats: 90
Default

Yup, you're good to go. With timing locked at 10deg either on the stock ecu or when doing timing offset setup on a standalone the orange one will like up with the 10 and the white one will line up with tdc.
Leafy is offline   Reply With Quote
Old 06-24-2016, 01:09 AM   #4
Junior Member
Thread Starter
 
Join Date: Nov 2015
Posts: 157
Total Cats: 10
Default

Thanks, just wanted to confirm the notion. Appreciate the fast response!
OGWar is offline   Reply With Quote
Old 06-24-2016, 09:04 PM   #5
Senior Member
iTrader: (1)
 
Onyxyth's Avatar
 
Join Date: May 2013
Location: Boyertown, PA
Posts: 719
Total Cats: 55
Default

I was curious of this too, thanks everyone.

On a somewhat related note - the crank trigger wheel has it's missing teeth like 60 degrees counter-clockwise of TDC, is that correct? or did I manage to put it on wrong? I checked at least 3 times and it only seemed to fit one way - but I'd like to be sure.
Onyxyth is offline   Reply With Quote
Old 06-24-2016, 09:14 PM   #6
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Delicious and Moist.
Posts: 26,327
Total Cats: 1,926
Default

Quote:
Originally Posted by Onyxyth View Post
On a somewhat related note - the crank trigger wheel has it's missing teeth like 60 degrees counter-clockwise of TDC, is that correct? or did I manage to put it on wrong? I checked at least 3 times and it only seemed to fit one way - but I'd like to be sure.
The absolute position of the missing tooth doesn't matter, only the relative position of the missing tooth as compared to the crank sensor. This is all adjustable in software, but in general, you want the missing tooth to pass under the sensor no less than 50-60 BTDC. And I can't remember where the sensor is on a '96 engine (I assume you're using the OEM sensor).
Joe Perez is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Dynotune appointment in two days and the car refuses to start, what luck :) unplugged92 MEGAsquirt 17 06-24-2016 09:38 AM
SOLD PLEASE DELETE doughboy118 Cars for sale/trade 5 06-24-2016 09:13 AM
OEM cloth top 1FastMx5 Miata parts for sale/trade 1 06-23-2016 04:30 PM
First Project Car, Hopefully My Daily Soon DaDanimal Meet and Greet 10 06-21-2016 05:16 PM
Wtb parts car. 89325iturbo WTB 0 06-18-2016 08:09 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 12:06 PM.