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How much can a person safely overbore their throttle body? I'm assuming I can take it to 62mm with no problem as that is what RSM is currently selling. 
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RE: Overbored throttle bodies
RSM sleaves their throttle bodies. They bore it out to the OD size of the piece of alum tube that they then fit into the throttle body and redrill the shaft holes and bleed holes.Colin
92 Sunbird GT, 3200 Hybrid 13.99@ 95.22 (2004)
90 Eagle Talon TSi AWD 10.54 @ 129mph. -
RE: Overbored throttle bodies
So 62mm is out of the question without sleaving the TB?Comment
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RE: Overbored throttle bodies
yes.
you break into the passages and the wall where the cavity is around the shaft bearings.
you can really only bore the stocker about 2-3 mm's and thats having to add JB weld to area's to thicken it up before you bore or you still break through a few small cavities.Colin
92 Sunbird GT, 3200 Hybrid 13.99@ 95.22 (2004)
90 Eagle Talon TSi AWD 10.54 @ 129mph.Comment
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RE: Overbored throttle bodies
i've heard of some going to 65mm. i've seen a RSM 62mm and didn't notice a sleeve. thought it was safe to go to 62mmAndy
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fastest 1/8: 10.19@ 67.17
fastest 1/4: 16.16@ 82.70
62mm TB, 1.6 roller tip rockers, Ostrich 2.0, UD pulley, TB heater bypass, K&N, 180* stat, No cat, 99Grand AM dual cooling fans. 4T65E swap FDR 3.69, EP LSD, F.A.S.T. transmission controller, TransGo shift kit.
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Re: RE: Overbored throttle bodies
Take a closer look again next time. Its sleaved, trust me.Originally posted by torq455Colin
92 Sunbird GT, 3200 Hybrid 13.99@ 95.22 (2004)
90 Eagle Talon TSi AWD 10.54 @ 129mph.Comment
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