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maybe this belongs in general tech, but i thought i'd post it here first.
i'm trying to be a pioneer, give the throttle body a GOOD port and polish, maybe get it big enough and switch out the current throttle plate.
anyway, are there water jackets in the TB? i need to know where, if any, so i kinda know how far to port out.
There is only a cavity. It is the long and narrow, the ends are wider than the center. Kind of like a distorted half moon.
I doubt you are going to run into problem with the water jacket, but you will likely break into the outside around 68mm. There are points around the TB, in between the sensors that are only a few mm thick.
If you are porting this by hand I would caution you. That blade has to fit airtight, or you will have idle issues.
If you want to be hardcore, convert to a GTP TB, it is already 70mm, plenty big for the L36.
BTW, you can increase the airflow WITHOUT porting the TB bigger. I can tell you how if you are interested.
Ok, you are going to have to take off the TB and do some measuring. On the GTP TB, if you look on the outlet of the TB, it opens up after the TB blade. I am pretty sure the L36 TB does this too. Now, the inlet of your engine intake is a certain diamter. I am guessing around 65mm. Now your TB had a minimum diameter of 65mm(which is around the TB blade area). If your TB opens up to a wider diameter after the TB blade(maybe around 73mm) and your intake is around 65mm, there are improvements to be made.
If you understand airflow, you will know that the least amount of abrupt direction changes and the least amount of diameter changes(except when you are talking about headflow, there is a little science to it), the better the flow.
There is a company now that has figured out that if you epoxy material(add material) to that area that opens up you can actually increase the airflow. Basically, you want to match the outlet of the TB to the inlet of the intake manifold.
If you want to go further, you can take your TB to a machine shop and have them bore it out. How much? I don't know. You are the pioneers. I tried doing this on a junk grand prix GT TB for the hell of it, which has the L36 just like you. It has a 65mm diameter. It started to turn to swiss cheese around 69ishmm. I wouldn't probably not bother going bigger unless you are planning forced induction or something.
You should notice a difference by just the epoxy work. Another thing you can do is machine the rod that hold the TB blade. With the TB open, that rod is an obstruction. If you lower the profile(shaving it down flatter on each side) you can effecting increase the usuable diameter of your TB.
Don't jack with the TB screen, and don't port the area around it. You might can lower the profile of the support post, but I am not sure how much it will help. That area had a huge diameter anyways.
Finally, you can polish it, and look for any other obstacle in the TB. You have to use your mind a little and imaging how air will flow over it. If it is square, round it, you get the idea.
Finally, the gains depend on how much air your engine can use.
i think i see what you're saying dee...
basically, i should add a little material to match it up to the intake?
but what about what you said about 'going further' and taking it to a machine shop to bore it out?
<blockquote>quote:</font><hr>Originally posted by navyblue2000:
but what about what you said about 'going further' and taking it to a machine shop to bore it out?<hr></blockquote>
If you were to bore it out a couple of mm, then you would want that diameter all the way to the intake manifold. The TB likely opens alot more than you can bore. So even if you bore it, you will likely have to add material.
Take it to an automotive machine shop and see what they say, if you want to go that route. Any competent machine shop should be able to accurately bore it out and make a new plate for you. It will also help you decide if the cost is worth it.
Oh, and it might be worth it to buy a spare TB off a junked car. Just in case anything goes wrong, and the shop would likely have it a few days. Thats what it takes to be a pioneer! ;)
i think i'm understanding you...should i epoxy the front or back of the TB, i mean after or before the throttle plate? i think i'm starting to get it now...i hope?
Haven’t done anything on the Camaro, but put LEDs on my truck headlights . And my oil pressure sensor went out on the truck so going to fix that this...
Haven’t done anything on the Camaro, but put LEDs on my truck headlights . And my oil pressure sensor went out on the truck so going to fix that this...
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