side project i'm working on (intake manifold)
04-28-2006, 07:43 PM
#11
1.0 BAR
Join Date: Nov 2005
Posts: 551
Re: side project i'm working on (intake manifold)
my teachers at school said that your not supposed to make the top of the intake mani smooth like glass like most people do i didnt pay to much attention but something about vortex or something like that maybe something else too....but either way he said you want to make the intake the way i just said and the exhaust glass like...
04-28-2006, 10:31 PM
#12
1.0 BAR
Join Date: Mar 2006
Posts: 279
Re: side project i'm working on (intake manifold)
That's correct - the best way to merge a runner into a plenum is by using a bell (or "velocity stack")... before people argue that it doesn't make a difference on forced induction engines, consider the fact that you're pressurizing your manifold.... not just adding volume from the turbo. Most airflow modifications for NA engines can be adapted to forced induction engines and the resulting power will only be greater. 
Colin
Colin
04-29-2006, 01:01 AM
#13
0.5 BAR
Thread Starter
Join Date: Aug 2003
Posts: 127
Re: side project i'm working on (intake manifold)
i set the plenum on my race hatch's gsr motor, it'll be really close, 
.. i'll probably do a little cutting on the end, its all good tho,
i find it funny how people think that having polished runners is bad. i agree that the intake ports shouldnt be polished.. and here's the reason, you introduce fuel to the air where the intake manifold bolts to the head.. so at the beginning of the intake port on the head. the problem with a polished port is that the fuel air mixture tends to separate and the fuel gets stuck to the walls on a polished surface, thats why they want some abrasion on the intake port. the runners on the manifold dont have any fuel flowing through them, so being polished can help. my runners arent polsihed, they're smoothed with 150 grit flapper wheel.
about having velocity stacks inside a plenum, yeah thats all fine and dandy, if you are making custom runners and have the right materials.. but when you're using existing factory runners, you show me how to make velocity stacks inside the plenum to mach them
? any of you ever seen the inside of a JG enginedynamics sheetmetal intake mani for the ITR or GSR heads? look just like that on the inside. and those JG IM's work really well.
this intake manifold is going for NA.. unless you think a 73mm TB is good for boost?
either way it'll never see boost while i have it, its for a GSR head so wont work on my turbo LS project.
i'm just building this for fun.. for the welding experience in class, and maybe i'll make some money on it at some point.
but basically just building it for the challenge. if it works great, if not, no big deal, it didnt cost me anything, and i got good welding experience on it with the contaminated gsr runner material.
thanks for the comments tho
.. i'll probably do a little cutting on the end, its all good tho, i find it funny how people think that having polished runners is bad. i agree that the intake ports shouldnt be polished.. and here's the reason, you introduce fuel to the air where the intake manifold bolts to the head.. so at the beginning of the intake port on the head. the problem with a polished port is that the fuel air mixture tends to separate and the fuel gets stuck to the walls on a polished surface, thats why they want some abrasion on the intake port. the runners on the manifold dont have any fuel flowing through them, so being polished can help. my runners arent polsihed, they're smoothed with 150 grit flapper wheel.
about having velocity stacks inside a plenum, yeah thats all fine and dandy, if you are making custom runners and have the right materials.. but when you're using existing factory runners, you show me how to make velocity stacks inside the plenum to mach them
? any of you ever seen the inside of a JG enginedynamics sheetmetal intake mani for the ITR or GSR heads? look just like that on the inside. and those JG IM's work really well. this intake manifold is going for NA.. unless you think a 73mm TB is good for boost?
either way it'll never see boost while i have it, its for a GSR head so wont work on my turbo LS project.
i'm just building this for fun.. for the welding experience in class, and maybe i'll make some money on it at some point.
but basically just building it for the challenge. if it works great, if not, no big deal, it didnt cost me anything, and i got good welding experience on it with the contaminated gsr runner material.
thanks for the comments tho
05-04-2006, 12:21 AM
#18
1.5 BAR
Join Date: May 2005
Posts: 840
Re: side project i'm working on (intake manifold)
The car is a 1982 Toyota starlet, the motor is a toyota 2rz, 2.4l twin cam
That LS marine throttle body looks nice, I have been looking for a Q45 tb but they always end up going for quite a bit of change.
I really like this throttlebody, but send $250 to somebodynamed Cheap Chang in Bangkok, Thailand with no feedback is a bit scary.
http://cgi.ebay.com/ebaymotors/ws/eB...RK%3AMEWA%3AIT
Later
Randy
That LS marine throttle body looks nice, I have been looking for a Q45 tb but they always end up going for quite a bit of change.
I really like this throttlebody, but send $250 to somebodynamed Cheap Chang in Bangkok, Thailand with no feedback is a bit scary.
http://cgi.ebay.com/ebaymotors/ws/eB...RK%3AMEWA%3AIT
Later
Randy
05-04-2006, 12:45 AM
#20
1.5 BAR
Join Date: May 2005
Posts: 840
Re: side project i'm working on (intake manifold)
Originally Posted by MerkurColin
Ahh, holy crap... I almost thought that was a 3TC at first. Brought back memories of my first car, the '82 Corolla little red "Radio Flyer" wagon. 
Colin
Colin
Mainly just for dyno days, and back it off to 400 or so for the track. 400 should still make for pretty easy high 10's in the 1/4. Rearwheel drive owns Here is a link to my old 2.3turbo rx7
http://www.eville140.com/rx7.html
If this car doesn't end up considerable faster than it I will drive it off in the river. lol
Later
Randy
