SaturnFans.com
saturnfans.com - classifieds - forums - webmail


Go Back   SaturnFans.com Forums > Reference Forums > Mods and Performance

 
 
Thread Tools Display Modes
Old 09-25-2003, 09:09 AM   #1
Wraith
Junior Member
Wraith is on a distinguished road
 
Join Date: Dec 2002
Location: Clemmons, NC
Posts: 43
Question Port Matching Intake Manifold to Throttle Body?

Hey guys, I will be dropping in a DOHC engine into my car in the next few months thanks to Joey at 6thplanet, and I'm researching little things I can do to give it a bit more pep.

I will be getting an engine from the same model year so I can retain most if not all of my current bolt ons (excluding plugs and wire obviously). So my question is, do ya'll think it would be worth it to port match the intake manifold to my SPS throttle body?

It seems like there would be some gains to be had there, since I would think the manifold in it's stock configuration would be a bottleneck. By having it matched to be the same size as the diameter of my throttle body I would gain some airflow, and therefore power.

I am by no means experienced at this kind of thing, so what do ya'll think?

p.s. I've tried looking on the internet, but all I can find on port matching relates to engines much larger than ours, although they do seem to get good results from it.
Wraith is offline  
SaturnFans.com Sponsored Links
Old 09-25-2003, 09:49 AM   #2
Applefool
Master Member
Applefool has a spectacular aura aboutApplefool has a spectacular aura aboutApplefool has a spectacular aura about
 
Applefool's Avatar
 
Join Date: Apr 2002
Location: Rochester, Ny
Posts: 2,595
 

2006 ION Red Line
Default

Yes, you want to match the TB to the Intake Manifold in order to get any benefit out of it. I also removed the ridge on TB where it connects to the intake manifold to smooth the flow a bit more.
...
2011 Audi TT (modified)
2007 Mercedes E550 (stock)
1999 Expedition (Stock)
2007 Ion Coupe (Daughters eventually)
Applefool is offline  
Old 09-25-2003, 10:02 AM   #3
Rob1998SL2
Guest
 
Posts: n/a
Default Applefool...

Could you give some more detail as to how to port match the TB to the intake manifold?

Thanks,
-Rob
 
Old 09-25-2003, 10:17 AM   #4
Twin_Cam
Senior Member
Twin_Cam is on a distinguished road
 
Twin_Cam's Avatar
 
Join Date: Nov 2002
Location: Camp Hill, PA
Posts: 1,684
 

2000 SL2
Default

Yea, details would be good. This is something I've wanted to do, and I know it involves a Dremel. But that's it. I imagine you'd need a vacuum cleaner so the little shavings of metal don't end up in the intake runners....
...
'00 SL2m- DD, 186K miles
'05 Honda CR-V- wife's DD and my upright bass hauler
'84 Honda CB650SC Nighthawk- toy
Twin_Cam is offline  
Old 09-25-2003, 11:12 AM   #5
eRic 02sc2
Super Member
eRic 02sc2 has a spectacular aura abouteRic 02sc2 has a spectacular aura about
 
eRic 02sc2's Avatar
 
Join Date: Feb 2000
Location: Closed Course. Professional Driver.
Posts: 14,542
 
Default

stuff a rag soaked in CLEAN oil into the intake manifold first to catch the shavings. then you can use a dremel or one of those kits that have the specific bit to grind away aluminum. use the throttle body gasket as a template. that's how big the hole needs to be inside for maximum effect. use the bolts to hold the gasket in place while you're grinding away. when you're done pull out the oily rag and that should bring the shaving with it.
...
eRic 02sc2
DR SCCA Solo 2001,2002 1st DSP
WHRRi 2007,2010 Fun Run 1st
DR SCCA 2008 Triathalon 1st PF
DR SCCA Solo 2009 2nd ST
DR SCCA Solo 2010 1st ST
Crutchfield: pkeqe-6j8e3-d2qqe
eRic 02sc2 is offline  
Old 09-25-2003, 02:48 PM   #6
Wraith
Junior Member
Wraith is on a distinguished road
 
Join Date: Dec 2002
Location: Clemmons, NC
Posts: 43
Default

So... can this be done with the manifold still bolted onto the engine? If so I may use my current engine (and manifold) as a guinea pig. Because if I can feel a difference with a SOHC, I'll definately notice with a DOHC.
Wraith is offline  
Old 09-25-2003, 03:16 PM   #7
eRic 02sc2
Super Member
eRic 02sc2 has a spectacular aura abouteRic 02sc2 has a spectacular aura about
 
eRic 02sc2's Avatar
 
Join Date: Feb 2000
Location: Closed Course. Professional Driver.
Posts: 14,542
 
Default

yes, you can do it on the car. that's why i suggested stuffing the oiled rag inside. if you did it off the car you'd just vacuum or rinse it out afterwards. dunno that you will "feel" a difference really. *maybe* you *might* feel throttle response is quicker.
...
eRic 02sc2
DR SCCA Solo 2001,2002 1st DSP
WHRRi 2007,2010 Fun Run 1st
DR SCCA 2008 Triathalon 1st PF
DR SCCA Solo 2009 2nd ST
DR SCCA Solo 2010 1st ST
Crutchfield: pkeqe-6j8e3-d2qqe
eRic 02sc2 is offline  
Old 09-25-2003, 04:58 PM   #8
Twin_Cam
Senior Member
Twin_Cam is on a distinguished road
 
Twin_Cam's Avatar
 
Join Date: Nov 2002
Location: Camp Hill, PA
Posts: 1,684
 

2000 SL2
Default

I'm worried I'll deep-six the rag into the manifold and never get it back. I'll figure something out.
...
'00 SL2m- DD, 186K miles
'05 Honda CR-V- wife's DD and my upright bass hauler
'84 Honda CB650SC Nighthawk- toy
Twin_Cam is offline  
Old 09-25-2003, 08:29 PM   #9
Sp00nSaturn
Junior Member
Sp00nSaturn is on a distinguished road
 
Join Date: Sep 2003
Location: Chicago, IL
Posts: 15
Default I wouldn't!

I would NOT try porting the intake manifold with it attached to the car still. Is it really worth the rise for the 2-3 horsepower you're going to gain?? Also, porting an intake is only effective if you know exactly what shape to hone out. It's not as simple as matching the holes, every where that the runners curve could use a little modification. Hence the reason you find manifolds polished by cramming clay through them, it curves in the same directions as the incoming air charge. Porting the head to manifold entrances are also needed to maximize the gain from porting.
I have a 322 cu V-8 that has been built for my Camaro, when I inquired at the machine shop about porting, he told me not to even bother. I was told that the most I could expect from that engine was 5-10 horsepower, and that was an optimistic guess. I imagine on a Saturn with no other mods, or even mild street mods, you could hope for 2? And if you do want to port the intake, remove it, take it to a machine shop, let them port it and polish it, and then reinstall it.
Sp00nSaturn is offline  
Old 09-25-2003, 11:01 PM   #10
wingnut
Member
wingnut is on a distinguished road
 
Join Date: Apr 2002
Location: Binghamton, NY
Posts: 408
 
Default port matching

Matching the manifold inlet to the TB outlet will be helpful---only if they don't already match. I removed my TB a year ago with the intention of doing just that and discovered they were already a perfect match, both to each other and to the gasket. That was easy! So check it out before you do anything drastic.

Like Applefool said, however, there is something to be gained by smoothing out the back of the TB (after the plate). There is a quick diameter change there. Next to changing my muffler, smoothing out that ridge made the biggest performance difference so far. Just make sure you get it really really clean before you put it back on the car!

Good luck with the swap.
wingnut is offline  
 

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Carbon behind throttle, intake manifold aa4lr S-Series Tech 2 12-03-2009 01:25 AM
Cleaning Throttle Body on 1999 SL2, Intake manifold looks to need it more Bjorno S-Series General 3 04-15-2009 07:25 PM
port matching jonsq54 Vue Mods 1 03-22-2007 07:05 PM
intake and throttle body install swoker183 Miscellaneous Tech 7 07-18-2002 04:41 PM
Port matching throttle body Ed Herring Mods and Performance 7 04-18-2001 12:05 PM


All times are GMT -4. The time now is 01:25 PM.

Advanced Forum Search | Advanced Photo Search


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
SaturnFans.com. The Saturn Enthusiasts Site.