BP Evolution??
May-14th-2003, 07:42 PM
#4
Protege Owner
Join Date: Dec 2001
Location: www.clubprotege.com
Posts: 587
AFAIK....
90-93 8.8:1 compression, cast iron exhaust manifold
94+ 9.0:1 compression, 'header style' exhaust manifold
95+ new VICS manifold. *looks like* it may produce more torque than the 1st gen's, but dunno for sure
kia sephia seems to have same BP as the 2nd gen pro.
TheMAN posted some info about the crank snout changes; seems like the '90 is the most prone to a failure. so far, i've had no problems with my '91....
also, at some point the oil line fitting for a turbo was 'dropped' from the BP, maybe 95??
90-93 8.8:1 compression, cast iron exhaust manifold
94+ 9.0:1 compression, 'header style' exhaust manifold
95+ new VICS manifold. *looks like* it may produce more torque than the 1st gen's, but dunno for sure
kia sephia seems to have same BP as the 2nd gen pro.
TheMAN posted some info about the crank snout changes; seems like the '90 is the most prone to a failure. so far, i've had no problems with my '91....
also, at some point the oil line fitting for a turbo was 'dropped' from the BP, maybe 95??
Last edited by protejay; May-16th-2003 at 10:43 PM.
May-16th-2003, 11:09 PM
#7
Protege Owner
Join Date: Dec 2001
Location: www.clubprotege.com
Posts: 587
I'm certainly no 'know-it-all' to this stuff 
Without some other long-time members here (you know who you are
) i wouldn't know much at all; but i've learned a lot here - and from other sites....
Anyways i edited my above post because i had said 'the 91-6 EGT had a 'header' manifold from the start'....well an EGT owner said it didn't, so there you go.
Also, looking closer at the 2 different VICS manifolds tonight, there is at least 1 MAJOR difference. Unlike the 1st gen's manifold, the Sephia's (2nd gen) manifold doesn't have the air valve. The air valve (used for idle control) is mounted directly underneath the upper half of our manifold. The 2nd gen's manifold does not have ANY of the mounting points, holes, etc for an air valve....So, there's hurdle #1 for anyone looking into swapping manifolds. And what's to say it'd even be worth the trouble?? I've said there may be some torque gains to be had....but do i know for sure??! Nope. Even if there are, it might not amount to much....
One other thing, the throttle body's are the same size.... i measured them both @ ~62mm.
Without some other long-time members here (you know who you are
) i wouldn't know much at all; but i've learned a lot here - and from other sites.... Anyways i edited my above post because i had said 'the 91-6 EGT had a 'header' manifold from the start'....well an EGT owner said it didn't, so there you go.
Also, looking closer at the 2 different VICS manifolds tonight, there is at least 1 MAJOR difference. Unlike the 1st gen's manifold, the Sephia's (2nd gen) manifold doesn't have the air valve. The air valve (used for idle control) is mounted directly underneath the upper half of our manifold. The 2nd gen's manifold does not have ANY of the mounting points, holes, etc for an air valve....So, there's hurdle #1 for anyone looking into swapping manifolds. And what's to say it'd even be worth the trouble?? I've said there may be some torque gains to be had....but do i know for sure??! Nope. Even if there are, it might not amount to much....
One other thing, the throttle body's are the same size.... i measured them both @ ~62mm.
June-12th-2003, 04:00 AM
#9
formerly chastan
Join Date: Jul 2002
Location: California, USA
Posts: 2,350
Originally posted by Bruce95fmla
no offense ment ,,
just search for BP ,, and the likes ..
There are tones of Questions about that motor
And I mean tons
no offense ment ,,
just search for BP ,, and the likes ..
There are tones of Questions about that motor
And I mean tons
June-12th-2003, 10:43 AM
#10
formerly chastan
Join Date: Jul 2002
Location: California, USA
Posts: 2,350
Originally posted by PseudoRealityX
http://members.aol.com/solomiata/MX5Engine.html
been posted before....this is basically THE source.
http://members.aol.com/solomiata/MX5Engine.html
been posted before....this is basically THE source.
The 95 EGT has stiffer valve springs too, right? Wouldn't that be preferrable? I was looking to convert to both DOHC and 5-speed. Don't tell me about cost-effectiveness by just buying an LX, this is just for fun . Besides, the DX is lighter . I can source a 95 EGT BP for $350, so... Going from SOHC --> DOHC do I have to change the wiring harness? I know the ECU will change. What about auto --> 5 speed? I know the TPS sensor is different... Will an automatic ECU run a 5-speed? If that's the case, I can switch the transmission first... otherwise I'd need to get SOHC 5sp, then DOHC 5sp ECU or something...or just do it all at once 
. I know this may seem far fetched but I want to play around 
June-12th-2003, 11:37 PM
#11
formerly chastan
Join Date: Jul 2002
Location: California, USA
Posts: 2,350
Originally posted by PseudoRealityX
Ask the people who've done it, not me. I never had the need to learn, and I never really cared, because I WOULD go to the cost effective way...
:shrug:
Ask the people who've done it, not me. I never had the need to learn, and I never really cared, because I WOULD go to the cost effective way...
:shrug:
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