Miatapower List Archive

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Mail From: Chris Robertson <(email redacted)>

Hi Everyone,

Here are some differences I found between a 1994
Escort GT BP motor and the Miata BP, plus a couple of
other observations. Thought I'd share them, AFAIK
they're undocumentd. Randy, feel free to add them to
your site (I'd be honored).

-The front pulley uses a V-belt for the alternator
(like the 1.6 Miata B6). The Miata 1.8 BP pulley is
not swappable because...

-The crank nose is different. The pulley bolt
arrangement is similar to the B6 Miata as the pattern
is a rectangle, not a square. Diameter is also
different from the Miata BP.

-The thrust bearings are smaller in radius than the
Miata BP.

-The standard transmission engine uses a smaller
flywheel, same as the B6 Miata.

-The standard transmission engine has the 8.8:1 CR
pistons.

That's all I can think of for now.

Chris Robertson
Bryan, TX

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Mail From: (email redacted)

By how much? The ones I've seen were identical.

Randy

> >>-The thrust bearings are smaller in radius than the
> Miata BP.

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Mail From: "Marc=?ISO-8859-1?Q?=A0?=Kulak, TurboMiata Performance" <(email redacted)>

>Here are some differences I found between a 1994
>Escort GT BP motor and the Miata BP, plus a couple of
>other observations. Thought I'd share them, AFAIK
>they're undocumentd. Randy, feel free to add them to
>your site (I'd be honored).
>
>-The front pulley uses a V-belt for the alternator
>(like the 1.6 Miata B6). The Miata 1.8 BP pulley is
>not swappable because...
>-The crank nose is different. The pulley bolt
>arrangement is similar to the B6 Miata as the pattern
>is a rectangle, not a square. Diameter is also
>different from the Miata BP.

This sucks... This means now TECII wheel won't fit to the Crank.. Hmmmm.. Did they change the cranks mid year? Randy?? I have an escort on the way which I *WAS* going to build into a 400+hp drag motor..

>-The thrust bearings are smaller in radius than the
>Miata BP.

Really?? Not a big deal, I can use the ford part number...

>-The standard transmission engine uses a smaller
>flywheel, same as the B6 Miata.

Great more spare 1.6 flywheels..

>-The standard transmission engine has the 8.8:1 CR
>pistons.

Cool.. Great for lotsa boost..

>That's all I can think of for now.

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Mail From: Chris Robertson <(email redacted)>

68.9mm vs. 73.7mm from end to end.

--- (email redacted) wrote:
> By how much? The ones I've seen were identical.
>
> Randy
>
> > >>-The thrust bearings are smaller in radius than
> the
> > Miata BP.
>
>


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This read-only message was archived from a public mail list.
Mail From: Chris Robertson <(email redacted)>


> >-The crank nose is different...from the Miata BP...
>
> This sucks... This means now TECII wheel won't fit
> to the Crank..

Look for a 1.6 adapter?

> >-The thrust bearings are smaller in radius than the
> >Miata BP.
>
> Really?? Not a big deal, I can use the ford part
> number...

That's what I did...got the right size from Napa,
Clevite brand (1994 Ford Escort GT).



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Mail From: (email redacted)

This doesn't sound good. I did the Escort swap into my 94 miata after I
pretzled the rods and found that the basics were the same but you would
definitly need a 1.8 miata motor to do the swap. I never measured the thrust
bearings so I don't know much about that issue. But I did bolt on my Miata
crank wheel with a Shiv trigger wheel on it and noticed that it wobbles a bit
now. And it did not bend when taking out the motor. I guess this is why.

Raj

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Mail From: "Marc=?ISO-8859-1?Q?=A0?=Kulak, TurboMiata Performance" <(email redacted)>

Still weird man! Randy mentions that the 92+ are the same as the 94+ BP and Danny G just did has done 2 escort swp with a 1995 and 1995 IHRC and the pulleys swapped no pobs.

Hmmmm..

Marc S Kulak
TurboMiata Performance (905)751-7291
Your Canadian Source for Jackson Racing, AVO Turboworld,
Nitrous Express, Harddog, VIS Racing and much much more...
Http://www.TurboMiata.net


---------- Original Message ----------------------------------
From: Chris Robertson <(email redacted)>
Date: Mon, 17 Jun 2002 17:33:24 -0700 (PDT)

>
>> >-The crank nose is different...from the Miata BP...
>>
>> This sucks... This means now TECII wheel won't fit
>> to the Crank..
>
>Look for a 1.6 adapter?
>
>> >-The thrust bearings are smaller in radius than the
>> >Miata BP.
>>
>> Really?? Not a big deal, I can use the ford part
>> number...
>
>That's what I did...got the right size from Napa,
>Clevite brand (1994 Ford Escort GT).
>
>
>
>__________________________________________________
>Do You Yahoo!?
>Yahoo! - Official partner of 2002 FIFA World Cup
>fifaworldcup.yahoo.com
>

This read-only message was archived from a public mail list.
Mail From: (email redacted)

I think he meant that the tec wheel would not bolt to a escort crank wheel.
I took my miata crank wheel with trigger and bolted it to the escort crank.
I never checked the crank diameter but the keyway did look the same.

Raj



In a message dated 6/17/02 11:08:51 PM Eastern Daylight Time,
(email redacted) writes:


> Based on what Chris mentioned, the TEC wheel we have would not even bolt on
> to his motor..
>
>

This read-only message was archived from a public mail list.
Mail From: Chris Robertson <(email redacted)>

Perhaps more than one version?

--- "Marc Kulak, TurboMiata Performance"
<(email redacted)> wrote:
> Still weird man! Randy mentions that the 92+ are
> the same as the 94+ BP and Danny G just did has done
> 2 escort swp with a 1995 and 1995 IHRC and the
> pulleys swapped no pobs.
>
> Hmmmm..
>
> Marc S Kulak
> TurboMiata Performance (905)751-7291
> Your Canadian Source for Jackson Racing, AVO
> Turboworld,
> Nitrous Express, Harddog, VIS Racing and much much
> more...
> Http://www.TurboMiata.net
>
>
> ---------- Original Message
> ----------------------------------
> From: Chris Robertson <(email redacted)>
> Date: Mon, 17 Jun 2002 17:33:24 -0700 (PDT)
>
> >
> >> >-The crank nose is different...from the Miata
> BP...
> >>
> >> This sucks... This means now TECII wheel won't
> fit
> >> to the Crank..
> >
> >Look for a 1.6 adapter?
> >
> >> >-The thrust bearings are smaller in radius than
> the
> >> >Miata BP.
> >>
> >> Really?? Not a big deal, I can use the ford part
> >> number...
> >
> >That's what I did...got the right size from Napa,
> >Clevite brand (1994 Ford Escort GT).
> >
> >
> >
> >__________________________________________________
> >Do You Yahoo!?
> >Yahoo! - Official partner of 2002 FIFA World Cup
> >fifaworldcup.yahoo.com
> >


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This read-only message was archived from a public mail list.
Mail From: Chris Robertson <(email redacted)>

The Miata BP front pulley will not bolt to this 94
Escort BP motor. The Miata 1.6 B6 appears to be he
same. Apparently there are some Escort BPs with crank
noses and pulleys like the Miata 1.8 BP.

--- (email redacted) wrote:
> I think he meant that the tec wheel would not bolt
> to a escort crank wheel.
> I took my miata crank wheel with trigger and bolted
> it to the escort crank.
> I never checked the crank diameter but the keyway
> did look the same.
>
> Raj
>
>
>
> In a message dated 6/17/02 11:08:51 PM Eastern
> Daylight Time,
> (email redacted) writes:
>
>
> > Based on what Chris mentioned, the TEC wheel we
> have would not even bolt on
> > to his motor..


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This read-only message was archived from a public mail list.
Mail From: (email redacted)

I swapped my pulley along with trigger wheel onto my escort motor.
Everything went together perfect but I don notice a wobble now. I'll take it
apart and measure the escort crank nose to my actual Miata crank nose.

Raj



In a message dated 6/18/2002 2:46:46 PM Eastern Daylight Time,
(email redacted) writes:


> The Miata BP front pulley will not bolt to this 94
> Escort BP motor. The Miata 1.6 B6 appears to be he
> same. Apparently there are some Escort BPs with crank
> noses and pulleys like the Miata 1.8 BP.