3/16" Throttle Body Blade hole too big?
03-14-2011, 08:05 PM
#1
3/16" Throttle Body Blade hole too big? Posted in the PCM tuning section, but no reply's yet..Maybe someone on here has tried different sized holes on the TB blade.
Purchased a used PTM 90mm TB and the throttle body blade seems to be slightly enlarged. I can barely put a 3/16" drill bit in it. I dont know what size these come with standard, but I know that the NW 90's come with a 1/8" hole. Will the 3/16" hole cause any issues with idle or give my tuner a hard time to tune it? Its going on a 346 car with a mild cam.
Purchased a used PTM 90mm TB and the throttle body blade seems to be slightly enlarged. I can barely put a 3/16" drill bit in it. I dont know what size these come with standard, but I know that the NW 90's come with a 1/8" hole. Will the 3/16" hole cause any issues with idle or give my tuner a hard time to tune it? Its going on a 346 car with a mild cam.
03-14-2011, 08:37 PM
#3
Well tell that to the previous owner that enlarged it lol..I recieved it used, and I was aware at the hole was slightly bigger as I could see it in the picture. I didn't enlarge it. I just stuck a drill bit in it to see what size it is..
What I am asking, is if this hole is too big.
What I am asking, is if this hole is too big.
03-14-2011, 08:47 PM
#5
The size of the hole may or may not cause problems it all depends on your set up. does the PTM no have a throttle blade set screw? And if you are going to enlarge the hole, you need to get machinist drill bits, and take it up 1/64 at a time. I made this mistake with my old fast 90/90 set up, took the hole to big and it idled way to high. Its not so easy to make the hole smaller again once you enlarge it.
03-14-2011, 09:41 PM
#6
And if you are going to enlarge the hole, you need to get machinist drill bits, and take it up 1/64 at a time.
It does have a throttle blade set screw. Could I simply put a rivet to completly seal up TB hole and then just adjust the air by the amount the blade is cracked open? I know that some TB's dont come the holes in the blades.
03-14-2011, 10:10 PM
#7
Guys I am not trying to enlarge the hole..It was like this when I recieved it.
It does have a throttle blade set screw. Could I simply put a rivet to completly seal up TB hole and then just adjust the air by the amount the blade is cracked open? I know that some TB's dont come the holes in the blades.
It does have a throttle blade set screw. Could I simply put a rivet to completly seal up TB hole and then just adjust the air by the amount the blade is cracked open? I know that some TB's dont come the holes in the blades.
