Reworking an intake
- Thread starter Mart u
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I did mine in stages. I only got it to the track once and the car was messed up so I don't have timeslips to back it up, just seat of the pants. First I just ported the runners. That was the 12.91@110mph street trim run. Next I cut it open and gutted it. I removed the zip tubes and center divider to make it basically an open chamber. It felt a little stronger with the biggest difference in the upper rpms and third gear. The last step I took was removing the EGR floor. I could sort of feel a difference but not sure really. The biggest difference by far was porting the runners. If you're not shooting for 11s or faster I would stick with just the runners, I don't think the cost justifies the gain. If you can do it yourself like I did, you might as well go all the way.
Someone can correct me if I'm wrong, but wasn't Lee Thompson's 10 second run made with just a ported intake, no gutting?
Someone can correct me if I'm wrong, but wasn't Lee Thompson's 10 second run made with just a ported intake, no gutting?
I could have sworn Lee's still has the runner in it. I think his decision to leave it had something to do with his alky injection on both sides of the intake, but not positive. (Heck what do I know, Ive got a TM V1 intake with the open plenum that might be hindering me more than helping me! I havent been able to figure it out yet, need some low et time slips to prove to myself that its not).
Well the runners are a given. I did see one picture somewhere and the underside was cut open along with the top. The bottom cut made me wonder. Doing the work myself is no biggie.
The fact I have three extra intakes will help. I'm from the school of do it right once.
Mart
The fact I have three extra intakes will help. I'm from the school of do it right once.
Mart
I have an intake that I ported the runners (gasket matched) and straightend the curves as much as possible.
angled the EGR hump , and then cleaned up the two openings inside the turbo inlet. I will get rid of it for about 125+shipping.
It has 2 holes in it for alchohol that need plugged, no biggie
Matt Wenning twostout4u@hotmail.com
angled the EGR hump , and then cleaned up the two openings inside the turbo inlet. I will get rid of it for about 125+shipping.
It has 2 holes in it for alchohol that need plugged, no biggie
Matt Wenning twostout4u@hotmail.com
(Yep, Im quoting myself
) I just realized what I said in that post. I didnt mean to say runner(s). Yes that would be a given. I was talking about the divider down the middle of the stock hotair intake (which kind of creates two large runners down the intake 
). I believe Lee left that in place to help with the distribution and/or atomization of the alky for which he has a nozzle on both sides of the divider. At least I could have sworn I remember reading that somewhere.I also remember him saying that he had some bad experiences with the open plenum V1 intake (like mine
) and went back to the stocker. Thus Im trying to see if it winds up being a weak link in my combo. Too much open space?racemybuick
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up my alley
Hey, this was info that I was looking for! What are runners? not to sound stupid, but I know nothing about the intake accept how to take it off and put it back on assembled. does anyone knew what the little 1/4 plug is on the front of the intake, driver side, just behind thermostat? I got two spare intakes to work on, and one is completely bare, and the other is completely assembled, minus a turbo : ). I was wondering if there were any diagrams detailing the intake, as opposed to the vague pictures on gnttype.org. Anyone wanna help me port mine? I got two if we mess up!!!
John
Hey, this was info that I was looking for! What are runners? not to sound stupid, but I know nothing about the intake accept how to take it off and put it back on assembled. does anyone knew what the little 1/4 plug is on the front of the intake, driver side, just behind thermostat? I got two spare intakes to work on, and one is completely bare, and the other is completely assembled, minus a turbo : ). I was wondering if there were any diagrams detailing the intake, as opposed to the vague pictures on gnttype.org. Anyone wanna help me port mine? I got two if we mess up!!!
John
Im guessing that the hole in the front of the intake might have been intended for the factory H2O injection that never happened 
I was going to try to use it to attach my boost gauge to on my TM V1 intake but found out that after Jay's fabrication that area just became a closed off space. Maybe I should cut a bigger hole into it and sit ice in their before runs
I was going to try to use it to attach my boost gauge to on my TM V1 intake but found out that after Jay's fabrication that area just became a closed off space. Maybe I should cut a bigger hole into it and sit ice in their before runs racemybuick
Hot Air Teacher/Student
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good idea
I was told by herb fishman that the 1/4 inch hole was factory alkohol inj, but not very efficient. It is an excellan place for the boost guage, as I am going to hook mine up in the same place. I was told that is a good place for the readings. Anyone got any ideas for my intake?
John
I was told by herb fishman that the 1/4 inch hole was factory alkohol inj, but not very efficient. It is an excellan place for the boost guage, as I am going to hook mine up in the same place. I was told that is a good place for the readings. Anyone got any ideas for my intake?
John
I would think that with the pipe plug being on only one side of the intake and the intake being divided in half, only 3 cylinders would get the alky if it were injected there.
Runners are the 6 runners that flow air into the heads. The intake also has zip tubes inside. The air goes into the opening in the back, splits in half, goes through the zip tubes, one on each side of the intake, under the runners, hits the front wall (thermostat side) and flips a U back into the main plenum which is divided in half. I removed all of this stuff and made it a big open plenum.
I'm running a 62mm bored out hotair TB. It's worth it, especially if the TB is still before the turbo. If mine were still before the turbo I would be looking for a 70mm unit and adapt it to fit.
I have a spare stock intake that I'm willing to port out for a small price+ core if anyone is interested.
Runners are the 6 runners that flow air into the heads. The intake also has zip tubes inside. The air goes into the opening in the back, splits in half, goes through the zip tubes, one on each side of the intake, under the runners, hits the front wall (thermostat side) and flips a U back into the main plenum which is divided in half. I removed all of this stuff and made it a big open plenum.
I'm running a 62mm bored out hotair TB. It's worth it, especially if the TB is still before the turbo. If mine were still before the turbo I would be looking for a 70mm unit and adapt it to fit.
I have a spare stock intake that I'm willing to port out for a small price+ core if anyone is interested.
iwinengineering has some decent pics of their intake porting.
Im using a throttle body that I had Jay Jackson port (really great job). Our TBs already have a huge 65mm opening for the incoming air. After the blade is where the thing really narrows down, and needs the most work. The outlet of the TB is 57mm and the step in between (right after the blade) is even smaller! This whole area gets ported to 62mm.
By the way, the 86/87 TBs are only 57mm all the way through and get ported to 62mm.
...concerning the throttle body.........
Yes, boring out the stock throttle body will help, especially if the heads and intake have been ported. If you look in the 84\85 TB, you will notice 2 copper tubes in the bore that the factory put in for a bypass around the throttle plate for the IAC to control airflow in an idle situation. These tubes are pressed in with a knurl at the end. They can be removed by squirting some loosenall or penetrating oil at the base of the tubes and pulling them out with channel locks or needle nose pliers. It won't be easy, but they will come out and leave an unobstructed path for the air to flow into the intake. Hope this helps......Dwayne
Yes, boring out the stock throttle body will help, especially if the heads and intake have been ported. If you look in the 84\85 TB, you will notice 2 copper tubes in the bore that the factory put in for a bypass around the throttle plate for the IAC to control airflow in an idle situation. These tubes are pressed in with a knurl at the end. They can be removed by squirting some loosenall or penetrating oil at the base of the tubes and pulling them out with channel locks or needle nose pliers. It won't be easy, but they will come out and leave an unobstructed path for the air to flow into the intake. Hope this helps......Dwayne
If I go the jay jackson route, will I notice much of a performance difference even if I don't have ported heads and intake? I was thinking of the Jay Jackson bellmouth job and then going with a TA 49? When I rebuild my spare motor I was going to port intake and heads then? Mart U, did not mean to whore on your thread!
Thanks!
Thanks!
RACEMYBUICK - I have pics of my home port job on my heads and intake. Just follow the link posted below in my sig.
I ported mine myself just cleaning up the runners and port matching. I also removed the EGR 'hump' or 'bridge' at the intake's opening where the turbo inserts. I smoothed out the floor area and took out all the roughness in the entire area of the intake opening and runners.
I also did my heads too - doing some bowl work and porting the heads - again only removing the casting flash and roughness. Not really removing too much material just making it smooth to the touch.
Check out the pics, buy a Dremel and / or a die grinder, some bits and go to work. Its easier then you think and it just takes time.
I ported mine myself just cleaning up the runners and port matching. I also removed the EGR 'hump' or 'bridge' at the intake's opening where the turbo inserts. I smoothed out the floor area and took out all the roughness in the entire area of the intake opening and runners.
I also did my heads too - doing some bowl work and porting the heads - again only removing the casting flash and roughness. Not really removing too much material just making it smooth to the touch.
Check out the pics, buy a Dremel and / or a die grinder, some bits and go to work. Its easier then you think and it just takes time.
racemybuick
Hot Air Teacher/Student
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gotchya!
Thanks for the pics...I am adding a little more info about that ghole in the front of the intake for alky. Yes, it is only for one side, but that is because there is another in the rear of the right hand side for the same purpose. Thanks for the pics and info...KIT!
John
Thanks for the pics...I am adding a little more info about that ghole in the front of the intake for alky. Yes, it is only for one side, but that is because there is another in the rear of the right hand side for the same purpose. Thanks for the pics and info...KIT!
John
