porting 85mm throttle body question
10-11-2007, 05:53 PM
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porting 85mm throttle body question alright, so i'm a cheap bastard...i bought a 96mm intake manifold a while back to aid in my h/c swap. i'm looking at the possibility of getting the summit 85mm throttle body and porting it since it seems to be a cheap option. i am wondering if anybody knows how big it can be ported. if i can get it close to 90mm, i will be going this route since PP won't be able to get the 96mm throttle body out for a while. thanks guys.
10-11-2007, 07:47 PM
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I actually ported and polished a couple 85mm professional product units. One was my personal one that i was going to use. They actually came out awesome but took 3 times as long as any other tb. The problem is that right out of the box they have the same problems stock tb's do, they restrict the flow with a ridge and leave a lot of room for porting.
After porting and polishing they are still an 85mm blade but it doesn't neck down to 81mm or so. Personally i had both 85mm sitting next to 90mm units and they are very similar and definitely flow plenty of air for most combos
After porting and polishing they are still an 85mm blade but it doesn't neck down to 81mm or so. Personally i had both 85mm sitting next to 90mm units and they are very similar and definitely flow plenty of air for most combos
10-11-2007, 08:06 PM
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yeah that would probably be a better one to use than the one off summit. not sure why i didn't think of that lol. thanks, do you know if it will match up tho the intake manifold?
10-11-2007, 09:11 PM
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Either of the 2 tb's are probably pretty much similar. Just ask PP, i believe that most people are using their 85mm on the 96mm manifold since the 96mm is not out yet so i assume they bolt up. Tim
10-11-2007, 11:16 PM
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Thats why with porting a stock tb the response is extremely increased, as soon as you get into the throttle more air is allowed in.
