Jeffs MSP GTR Build

[MazdaNoob]

being in Kanuckistan he needs the heater core .. but ditching the AC and everything associated has to be a good 20-30 lbs not inc the condenser and compressor

[D323]

Yeah just saw the location and thought about that. Probably best to keep the heater. Keeping the stock air box is probably necessary as well. Aftermarket compact heater box from summit or jegs or something might offer a compact unit that doesnt have all of the AC stuff attached.

[vtec-this]

ok well new update:

it turns out my crank pulley which i thought was in great shape certainly is not.

I noticed that the damn wobble at low low (like 400)rpm was not going away so I removed the pulley and found some bad news.

1. the pulley (which is essentially held together by rubber) is actually torn pretty much the whole way around. Unless you pry at it a bit, you would have no idea that the rubber has separated. Just sitting there it looks fine, but put some pressure on it and you can see the rubber is barely holding it together.

I am assuming the reason my bolt kept coming loose was because this wobble would constantly be loosening the bolt, regardless of torque/lock tight applications.

the wobbling pulley would then side load whatever alternator I had in the car and burn it up in short order.

2. upon removing the pulley, I found that my crank timing belt gear is off about half a tooth, and the little rectangular key with flat end no longer resembles anything that I remember installing. It looks more like a "Z" piece from tetris game.

3. although the key was fubar, the crank APPEARS to be OK. I guess the key is made of softer metal so the key got messed up, but the crank "keyway" i guess you would call it looks OK.

I managed to take the little key, hammer it back into something that somewhat resembles the stock key and reinstall. New locktight, 120 foot pounds on the bolt. Start it up and she wobbles even worse than before.

So now I am at the point where I need to locate a new crank pulley/crank timing belt gear/key.

Trouble is, I believe the 91 EGT pulley is different than all the other years of EGT, but I am not really sure.

Called partsource, they cant get any pulleys. Called napa, they ordered the pulley, drove all the way there, and its a damn 1.9 sohc pulley.

Running out of ideas. there is apparently a local guy selling a whole 91 motor for ~$100, but he wont seperate the pulley.

I figured that maybe I could look into something aftermarket, however I am not sure how the BP would react to a lightweight crank pulley and high boost.

the other issue I have is I would prefer to order a pulley that can be used on both my 91 EGT motor and my GTR motor, however my GTR is stuffed away in storage and it would take me forever to get the damn thing out right now just to verify that it has the same crank snout as my 91 egt. Does anyone know offhand if the gtr has the same snout? I never got a pulley on it so I am not sure from pics if it is the same as my 91.

any advice/input on where to locate pulley in gta canada would be appreciated!

I found a few posts on CP about the crank snouts. There are apparently 3 of them-Short,Long,Large I believe, however depending on whos thread you are reading the info on them seems to vary.

From what I understand at this point, the 89-91 1.6 miata, 91 EGT and maybe the first year or so of 1.8 miata all have the same pulley/snout, however I do not know if they have interchangeable pulleys. Mine has the 1 large bolt hole and 4 smaller 10mm bolts surrounding.

If someone could verify or correct me that would be great because I really need to track down and order the right parts. Dont wanna take another long drive somewhere for nothin.

[KaleoXtreme]

I "think" there are only 2 crank snout sizes. Short/small, and long/large. The verbiage may vary, depending on who wrote it.

[FE3-323]

get some pictures up of the crank parts & i can tell you right away

[vtec-this]

sure will try to take some pics. found a local motor for $100 was hoping to go get the pulley off it tonight but seller could not make it, if all goes well i will have another 91 pulley and possibly whole spare motor tomorrow.

[vtec-this]

well I just went up to meet a guy to pick up a 91 pulley and it was completely different than my pulley that came in my 91 egt parts car.

now i am thinking that maybe my parts car had the engine replaced at some point in its life so possibly I have a newer style 93+ bp motor that could work with miata pulleys?

my engine has just a pulley, a key and a cog. nothing else.

the pulley i took off the guys 91 motor tonight had a pulley washer piece, a pulley, 2 smaller plates, then a cog with smaller key than i have on my motor.

sort of confusing trying to figure out which year of parts I need to replace the pulley/cog/key on my motor.





as you can see in the pics there are those plates. i dont have a picture of my motor, but I have none of those- just pulley/cog/key. does this mean i have a 93+ motor? or a early early 91 egt motor?

could I use the pulley in this picture on my motor or will the crank snout not be compatible? id like to be at least 51% sure before i go rip it apart to find out.

[FE3-323]

yours is a small nose. mildly notorious for having crank keyway issues.

the other one is a large nose. I do not believe they are compatible in any sense

[vtec-this]

after reading the thread

http://www.wihandyman.com/forum/showthread.php?33700-Is-this-the-big-nose-crank/page2&highlight=big+nose+comparison

I think you guys are saying I can use a b6, b5, bp or bpt from 91.5 or older? 91.6+ is the big nose which is what the guy from tonight had in his 91 egt?

[FE3-323]

EGT's are a whole different breed of mazda parts bins. thats why i dont **** around with em.
i wouldnt suggest any b5/b6 parts. altho the b8(sohc BP) or any other compatible BP variant will suffice 100%

[vtec-this]

so essentially i am stuck trying to find a early 91-91.5 egt or sohc bp pulley/cog/key is what you are saying.

[Boosted Escort]

EGT's are a whole different breed of mazda parts bins. thats why i dont **** around with em.

care to elaborate?

[FE3-323]

so essentially i am stuck trying to find a early 91-91.5 egt or sohc bp pulley/cog/key is what you are saying.

im not sure why your stuck on the idea of EGT parts. theres nothing wrong with using mazda pieces....

[vtec-this]

well i was offered a 94 1.8 miata pulley locally that looks like it might fit. Guna try it out this weekend. Wont know til I pull it all apart.

[FE3-323]

^ that picture is a big nose setup. & will not work on a small nose like yours