hows this tb porting job?
#2
Its so hot here!!!!1
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its not bad at all, but if i were you on the little triangle pieces on the side, I would get rid of as much as possible. Make it as round and thin as possible, at least thats what I did to mine.
#7
Damn, it did start!
has anyone bored out the valves and put a larger plate in
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#10
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Originally Posted by Richard Miller
has anyone bored out the valves and put a larger plate in
You need to have a good vertical mill.
The bore must fit the throttle plates perfectly, or you'll get leaks that will not allow you to drop the idle speed down.
I do NOT recommend doing this with a dremel or die grinder.
The plates needs to have a very sharp geometrical edge that close exactly to the bore.
-Ted
#11
I'm a boost creep...
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Originally Posted by MFP10thAnn
I was a bit too zealous with mine and ended up grind through the side wall. Oh well, that's what JB weld's for
Originally Posted by Richard Miller
has anyone bored out the valves and put a larger plate in
#13
Not a Racist
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wouldnt smoothing the apex's out make sumthin where air would slow down on entering and cause turbulance? (example a) when having the blade would pretty much split the air? (see example b) this is just my guessing
Last edited by renagade_rotary; 04-03-05 at 11:02 AM.
#18
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Originally Posted by Karack
turbulence is good when it affects the atomization of the fuel, this is pre fuel delivery.
Not that this really matters in this case. Any effects from slightly rough internal TB surfaces (good or bad) would be tiny. Smoothing out the sanding marks is fine, but actually polishing the inside of the TB is just a waste of time. You might as well polish the insides of you exhaust tips while you're at it...
#20
why would polishing the intake be bad? I guess it depends on the car. My autotech teacher rebuilt the 3 cylinder engine in his geo metro and polished everything including the intake manifold, throttle body, pistons, combustion chambers, head, he's getting like atleast 75 mpg and alot more power. i guess your saying polishing would take out the turbulence in air flow, which you want, but i would guess from the spiral intake tracts/runners on a briggs and straton engine (lawnmower?) that the velocity increase is just as important so wouldn't the air entering the engine enter at a higher velocity if the intake had less turbulence? please inform me
#21
W. TX chirpin Monkey
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I've seen some ridiculously well polished intakes and ports that worked fine. Then I saw this intake runner that looked like glass on the inside. Yeah, he had problems idling. But once it went, it was gone. This was on a carb, so maybe he could have corrected that with a standalone, but I'm not sure. The moral is. It has to be REALLY smooth, for it to cause little turbulance. there are several turns in the Intake Manifold that add sufficient turbulance not to mention boost.
#22
Sharp Claws
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carbs have very poor fuel atomization, nice cleaned injectors have decent atomization, dirty injectors have poor atomization. the velocity of the flow past the throttle body should be increased as much as possible, it becomes turbulent once it hits that wall directly behind it anyways. turbulence in the intake runners is a tradeoff, want top end power? get high velocity short runners. want good bottom end torque? provide turbulent longer intake runners, both require good fuel atomization, the better the atomization the more power can be derived from the A/F mixture.
#23
rawr
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i realize this is an old thread, but porting polishing does more than 2hp, the guy at BDC motorsports has a dyno of a ported/polished TB, without the car made 404rwhp, after the ported/polished TB, 442rwhp, 38rwhp doesnt seem that bad to me for a couple hours worth of porting. i realize it wouldnt be as much on a lower power car, but still.
#25
My job is to blow **** up
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Originally Posted by Agent_D
i realize this is an old thread, but porting polishing does more than 2hp, the guy at BDC motorsports has a dyno of a ported/polished TB, without the car made 404rwhp, after the ported/polished TB, 442rwhp, 38rwhp doesnt seem that bad to me for a couple hours worth of porting. i realize it wouldnt be as much on a lower power car, but still.
the tb mod is one of those "great, with supporting mods"-mods