Smallport head question

The place for all technical car discussions. If you haven't already, read our Disclaimer first!

Moderator: The Mod Squad

Smallport head question

Postby Maxwedge » Tue Aug 14, 2007 12:56 pm

Can you run a smallport head and inlet manifold using bigport loom, injectors, TPS, throttle body etc etc on a bigport block? And if so would you get a power gain?
Maxwedge
Toyspeed Member
 
Posts: 88
Joined: Thu Apr 27, 2006 10:02 am
Location: Auckland

Postby frost » Tue Aug 14, 2007 2:27 pm

you could but its maped differently so youd loose power,
a few things i can think of that would not work..
injectors use different signal
tps use different signal.
frost
Toyspeed Member
 
Posts: 1705
Joined: Mon Aug 08, 2005 11:19 pm

Postby rollaholic » Tue Aug 14, 2007 6:52 pm

smallport head has the oil drain valve at the back, with no matching port on the bigport block!
BASU!
User avatar
rollaholic
Toyspeed Member
 
Posts: 5383
Joined: Fri May 28, 2004 2:19 am
Location: West is Best

Postby bluemaumau » Tue Aug 14, 2007 7:17 pm

weld return into sump,

does mean sump removal tho
4AGTE AE101 COROLLA - 90%

Where the $&#$% is that oil leak coming from /club

looking for enkei RP01 center caps (white)
User avatar
bluemaumau
Toyspeed Member
 
Posts: 4087
Joined: Sun Oct 16, 2005 7:08 pm
Location: SYDNEY, NSW

Postby ChaosAD » Tue Aug 14, 2007 7:36 pm

Some people have dropped smallport 4age's into ae82 corollas using the bluetop ecu etc. Have to use bluetop dizzy, injectors etc though.
Not sure if they would gain or lose power over the bluetop.
User avatar
ChaosAD
Toyspeed Member
 
Posts: 2212
Joined: Wed Sep 03, 2003 11:40 am
Location: Whangarei

Postby RedMist » Tue Aug 14, 2007 8:38 pm

I wouldnt run the smallport injectors with the bigport ECU. You'll wash the bores and cause engine damage. Even with the bigport injectors I would very much doubt you'll get an increase in power. My bet is on a net loss as the ignition and fuel map will be tuned for a different flow charastic.
The answer is Helmholtz!

Toyota ST185 Celica Rally.
Toyota ST205 Celica Rally.
Jimco/ Cosworth 350z Offroader - 609whp at 16psi
User avatar
RedMist
Old Skool User!
 
Posts: 3078
Joined: Tue May 21, 2002 12:39 pm
Location: Christchurch

Postby rollaholic » Wed Aug 15, 2007 8:22 am

you could just buy my smallport long block and be done with it ;)

viewtopic.php?t=59827
BASU!
User avatar
rollaholic
Toyspeed Member
 
Posts: 5383
Joined: Fri May 28, 2004 2:19 am
Location: West is Best

Re: Smallport head question

Postby jondee86 » Thu Aug 16, 2007 8:50 pm

Maxwedge wrote:Can you run a smallport head and inlet manifold using bigport loom, injectors, TPS, throttle body etc etc on a bigport block? And if so would you get a power gain?


No reason why you couldn't swap a smallport head and manifold for
your bigport head and manifold. So long as you are using the bigport
injectors and ECU etc., there should not be any problem.

AFAIK the extra power in the smallport was due to higher com pistons and
an improved injector spray pattern. You won't be using either of these, so
the chances are you will feel little or no change... apart from the loss of
your TVIS.... which might make it feel sluggish off the bottom :-|

Cheers... jondee86
1984 AE86 Corolla GT Liftback, NZ new... now with GZE
spec small port, twinscrew s/c and water/methanol injection :)

Watch this space >>> <<<
User avatar
jondee86
Toyspeed Member
 
Posts: 903
Joined: Mon Aug 18, 2003 11:08 pm
Location: Wellington

Postby QikStarlie » Thu Aug 16, 2007 9:19 pm

not likely. port size and intake manifold, have a bigger effect than a bit more compression and spray patterns.
use the smallport ecu or you'l have rich and/or lean patches. no matter what injectors you use with a bigport ecu.
User avatar
QikStarlie
Toyspeed Member
 
Posts: 1110
Joined: Tue Mar 25, 2003 10:30 pm
Location: lost..

Max Power vs Godzilla....

Postby jondee86 » Thu Aug 16, 2007 11:18 pm

According to the Club 4AGE spec sheet :

Bigport Max Power 130@6600, Max Torque 15.2@5200

Smallport Max Power 140 @7200, Max Torque 15.0 @6000

So yeah, the smallport has a little more topend power by virtue of the
extra rpm's. If the torque curves are similar, then at 6600 the smallport
is making pretty much exactly the same power as the bigport. So it
doesn't look like the manifold design does much except push the Max
Torque point up the rev range... hm ?

Would this engine be running an O2 sensor ??

Cheers... jondee86
1984 AE86 Corolla GT Liftback, NZ new... now with GZE
spec small port, twinscrew s/c and water/methanol injection :)

Watch this space >>> <<<
User avatar
jondee86
Toyspeed Member
 
Posts: 903
Joined: Mon Aug 18, 2003 11:08 pm
Location: Wellington

Postby QikStarlie » Fri Aug 17, 2007 5:11 pm

yeh thats what the tune generaly follows tho. the torque curve. so diffrent torque curve = diffrent fuel map
User avatar
QikStarlie
Toyspeed Member
 
Posts: 1110
Joined: Tue Mar 25, 2003 10:30 pm
Location: lost..

Re: Max Power vs Godzilla....

Postby Mr Revhead » Fri Aug 17, 2007 6:04 pm

jondee86 wrote:According to the Club 4AGE spec sheet :

Bigport Max Power 130@6600, Max Torque 15.2@5200

Smallport Max Power 140 @7200, Max Torque 15.0 @6000

So yeah, the smallport has a little more topend power by virtue of the
extra rpm's. If the torque curves are similar, then at 6600 the smallport
is making pretty much exactly the same power as the bigport. So it
doesn't look like the manifold design does much except push the Max
Torque point up the rev range... hm ?

Would this engine be running an O2 sensor ??

Cheers... jondee86


however.... find me examples of thsoe that can run those numbers!
Being the subject of E-whinges since 2004 8)

http://www.centralmotorsport.org.nz/home

Image
User avatar
Mr Revhead
SECURITY!
 
Posts: 24635
Joined: Tue Jan 20, 2004 4:06 pm
Location: Nelson


Return to Tech Questions

Who is online

Users browsing this forum: Google [Bot] and 4 guests

cron