b6-t info - 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 07-15-2008, 10:43 PM   #1
Elite Member
Thread Starter
iTrader: (5)
 
Join Date: Jan 2007
Location: Freehold, NJ
Posts: 1,577
Total Cats: -2
Default b6-t info

Ok so i am about to pick up aB6-T off a local guy for 175$ complete motor manifolds and turbo and all. I know the bottom end,(pistons and rods) are stronger than the stock 1.6.

I wanted to know if anyone has had the head and cams checked out? I'm thinking that they may be better than the stock ones because its from a factory turbo car, and i know the jdm bp-t (1.8 gtr) has better cams and bottom end as well.

So my qeustion is does anyone know the specs of the stock 1.6 cams? and has anyone had the 1.6 head flow tested before?
disturbedfan121 is offline   Reply With Quote
Old 07-15-2008, 10:53 PM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,857
Total Cats: 1,788
Default

solomiata.com
Braineack is offline   Reply With Quote
Old 07-15-2008, 11:53 PM   #3
Elite Member
Thread Starter
iTrader: (5)
 
Join Date: Jan 2007
Location: Freehold, NJ
Posts: 1,577
Total Cats: -2
Default

http://members.aol.com/solomiata/cams.html

thanx for the info for the stock cams brain, anyone know the gtx specs?
disturbedfan121 is offline   Reply With Quote
Old 07-16-2008, 12:48 AM   #4
Junior Member
iTrader: (2)
 
Join Date: Oct 2007
Location: Lisle, IL
Posts: 296
Total Cats: 0
Default

Quote:
Originally Posted by disturbedfan121 View Post
http://members.aol.com/solomiata/cams.html

thanx for the info for the stock cams brain, anyone know the gtx specs?
i
Search miata.net or solomiata for more info on the GTX. I believe the 1.6 GTX exhaust cam was similar to stock NA exhaust cam but ground around 10* retarded which reduced overlap to about 10* (stock overlap around 20* as I recall). Simply retarding the stock exhaust cam should work too; I played around with Sport Compact Dyno last week (modeled a 1.6 with 10 psi boost and stock cams) and got the best overall power tq/hp by running the intake sraight up and the exhaust 6* retarded.

1.6 GTX also had beefier rods than NA 1.6/1.8 which fit NA motors (still may require balancing due to increased weight) and a slightly larger oil filter (which will fit a 1.6 NA).

Mitch
sn95 is offline   Reply With Quote
Old 07-16-2008, 01:50 AM   #5
Elite Member
Thread Starter
iTrader: (5)
 
Join Date: Jan 2007
Location: Freehold, NJ
Posts: 1,577
Total Cats: -2
Default

neither site has much info on the gtx cams. or the whole head for that matter. i think i'll shell out the money and then give people the definite answer, hopefully it would be beneficial and not a waste lol
disturbedfan121 is offline   Reply With Quote
Old 07-16-2008, 09:58 AM   #6
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,857
Total Cats: 1,788
Default

that motor had really low compression but pushed something like 20psi....im sure the profile is better suited for boost.
Braineack is offline   Reply With Quote
Old 07-16-2008, 11:49 AM   #7
Elite Member
Thread Starter
iTrader: (5)
 
Join Date: Jan 2007
Location: Freehold, NJ
Posts: 1,577
Total Cats: -2
Default

Thats exactly what I'm thinking. If it is better then stock head, it could be the equivalent to a 99 head on a 94-97. except more rare lol
disturbedfan121 is offline   Reply With Quote
Old 07-16-2008, 12:18 PM   #8
Elite Member
iTrader: (39)
 
Zabac's Avatar
 
Join Date: Sep 2007
Location: High Point NC
Posts: 4,854
Total Cats: 8
Default

I doubt the head is any different, only the cams if anything at all as far as specs go.
A manufacturer will not make a whole new head for such a limited production run if they have something that works, they only upgrade parts that have to get upgraded, like rods, etc.
I did read somewhere that the valves were different, they are sodium filled to shed more heat or something like that.
Zabac is offline   Reply With Quote
Old 07-16-2008, 12:49 PM   #9
Junior Member
iTrader: (1)
 
Join Date: Oct 2004
Location: Haarlem ,the Netherlands
Posts: 453
Total Cats: 0
Default

Nothing special on the b6 t except the rods and lower compression pistons...
Head is simular to the miata. The rods are heavier, reducing save max rpm
The Sodium filed valves are only found in the gtr version of the 323.

The Japanese/Austr market version of the Protege got a turbo version of the 1.8, the 'BPT' equipped GTR and GTX. The very rare GTR recieved, amoung other things, a special web stiffened block cast 'BPII', a special cast '26' head with a flow vane in the intake port and sodium filled exhaust valves!.

http://members.aol.com/solomiata/MX5Engine.html
greddymx5 is offline   Reply With Quote
Old 07-16-2008, 01:19 PM   #10
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,857
Total Cats: 1,788
Default

Didn't the GTX rally cars make something like 250rwhp and 300tq, with 7.8:1 compression pistons? The cam profile is surely different.....i believe factory parts had to be used....


but maybe im confusing the GTX with the GTR.....which is the upgraded version of the GTX.
Braineack is offline   Reply With Quote
Old 07-16-2008, 11:27 PM   #11
Junior Member
iTrader: (2)
 
Join Date: Oct 2007
Location: Lisle, IL
Posts: 296
Total Cats: 0
Smile

Quote:
Originally Posted by disturbedfan121 View Post
neither site has much info on the gtx cams. or the whole head for that matter. i think i'll shell out the money and then give people the definite answer, hopefully it would be beneficial and not a waste lol
The Solomiata link you referenced has basic specs for GTX 1.6 cams, you just have to understand how to read the valve events:

NA & GTX Intake valve timing:

Intake 5BTDC, 51 ABDC
5* Before Top Dead Center plus 180* (TDC to BDC) plus 51* After Bottom Dead Center = 236* intake duration

NA Exhaust valve:
Exhaust 53BBDC, 15 ATDC
53* Before Bottom Dead Center plus 180* plus 15* ATDC = 248* Exhaust duration
NA overlap = 20 degrees (period of time 5BTDC intake to 15ATDC exhaust)

GTX exhaust valve:
Exhaust 69BBDC, 1TDC
69* + 180* + 1* = 250 exhaust duration
GTX overlap = 6 degrees (5BDTC intake to 1 ATDC exhaust)

Far as I can tell Intake cams are identical between NA and GTX, exhaust cam looks like a stock NA cam ground 16* retarded (2* difference between 248 duration NA and 250 duration GTX is probably measurement error).

You can probably get the performance the GTX exhaust cam by using an adjustable cam gear on the stock NA exhaust cam. As noted in an earlier post, I did some software modeling on a 10psi NA cammed 1.6L and got the best overall hp/tq running the intake straight up and exhaust at 6* retarded. Higher boost numbers might favor more cam retard (with even less overlap)

Last edited by sn95; 07-16-2008 at 11:41 PM. Reason: typo
sn95 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Buzzing from driver side of engine bay? (MS3 install) nick470 MEGAsquirt 7 06-16-2017 02:53 PM
Bunch of NB stuff - mspnp2, begi intake mani, injectors mikeflys1 Miata parts for sale/trade 12 05-01-2016 10:51 AM
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 01:25 PM
Squiblez 1996 Montego blue Squiblez Build Threads 2 09-22-2015 11:17 AM
mslabs MS2 - Idle control issue ndragun MEGAsquirt 0 09-20-2015 11:28 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 04:45 PM.