Im taking my tb to get bored out to 59mm and i need to know if the throttle plate needs to have the hole in it like the stock plate has??I looked at rsm and theirs doesnt have a hole but i need to make sure..phil
it might not idle without tweeking the butterfly a little if the hole isn't in it. I'd duplicate the hole , but be sure not to increase the size. Error on the small side.
How much are you paying? do you have a dremel? I would do it myself.. Im cheap like that. I think Im gonna do my intake manifold too. And If I can get a head from the junkyard from cheap.. guess what.. dremel comes out again!
Speed costs... How fast ya wanna go??
<a href="http://mywebpages.comcast.net/pj1987">My old cars</a>
yes...i have a dremel but your planning on boring your tb with one? it does have to be a good fit you know...plus id rather pay somene to bore it out and have it done right then to try one with a ....dremel and have to pay someone after..phil
Well how much are you paying them?
Speed costs... How fast ya wanna go??
<a href="http://mywebpages.comcast.net/pj1987">My old cars</a>
well its only going to cost about 40$. But it is worth it since if you use a dremel it wont be perfectly round and wont work. line boring is the ONLY way to get that tb a nice clean and round circle..phil
the throttle plate needs to be very close to the TB bore for it to work properly. i mean just a matter of a couple thousandths of an inch difference. i work in a machine shop and we tried to oversize a TB for my old sunfire. we were a bit too small on the plate and the TB didnt work right. idled to high, car ran really poorly. this job needs to be done VERY carefully, preferably by a good machne shop with good equipment. if you half ass it like we did it wont work right. just pay the money and buy one from a reputable place like RSM.
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true. and the only holes in the plate should be the ones that secures the plate to the throttle rod, should be two of em,
ok so what is the third hole in your stock tb for then?cause i thought that hole was for idling....just tring to make sure..phil
I want to port my tb also but i have no clue what anyone is talking about with the hole and if they line up. Can someone help me out a little more?
The third hole is for idle. It's not difficult to bore your own throttle body but you need a good lathe and and adaptor plate to bolt it to, and anvil to turn a new butterfly on. First turn up a round plate to mount the throttlebody to, make sure the bolt pattern centers the bore of the throttlebody. Bore it to the desired size. Measure to varify the size for the new butterfly. transfer the two mounting holes to an oversized diameter plate screw the new butterfly to another disc being sure to center the hole pattern in the lathe jaws. It'll take a little more machining knowledge to finish explaining the process. Hope this helps. And the "idle" hole must be the same size or smaller, and to make the car idle you just open the butterfly with the set screws.
The third hole is only partially used for idle control. The idol control port and solenoid, located at the top of the TB, does most of the work. The holes main purpose is to make for a smoother transition during throttle tip over(when the throttle blade fist goes from fully closed to opening). Even with the idle control solenoid bypassing the TB, there is still a substantial amount of vacuum on the throttle blade. The relieves a small amount of the vacuum so when the throttle begins to open, it's not so difficult to break the vavacuumThe result is a easier, more cocontrolledower application.
With out the hole, if the throttle blade is a tight fit, you have to press the accelerator a little harder to break that vacuum. Since you are pressing harder on the accelerator, when the vacuum breaks, the throttle opens up quicker, allowing a slight "pop" of air to enter the engine. This "pop" of air rushes in before the computer can adjust the fuel, causing a momentary lean condition and a slight bog. Once the O2 sensor reads the lean condition the PCM dumps more fuel and the motor surges. All this happens in only a fraction of a second.
Most likely, the momentary lean condition wont last long enough to cause any damage, so you could get by without the hole. The biggest thing you will notice though, is a smoother power application during your normal daily street driving and that depends on how well your throttle plate fits.
