Bbk throttle body question
Thread Starter
Instructor
Joined: May 2006
Posts: 128
Likes: 1
From: KY
Bbk throttle body question
I installed a bbk 52 mm throttle body on my 85. I'm having a problem with the airduct. The new tb's snout is larger than the old tb. Any ideas how to fix this? Thanks
Safety Car
Joined: Apr 2011
Posts: 3,660
Likes: 22
Then to be cool and sexy you have to buy a Smooth Bore "power coupler" from one of the catalog stores or E Bay. Those can be $50 or more....so the $10 bell reducer (that fits perfectly with hose clamps on each end) starts looking better everyday.
I brought this to the attention of a BBK rep at a Corvette shop many yrs ago when I discovered the stock accordian duct was too small to fit the BBK mouth. Nothing ever came of it as I suspected. They should at least warn people that the stock duct will not fit their larger TB.....
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
I did this when I installed a 52mm TB. The air duct is plastic and pretty thin so go real easy with the heat gun. I have a small vise on my workbench and the big end of the duct easily fit over it when the vise was closed. I headed the duct and placed it around the side of the vice jaws and slowly opened the vise to stretch the duct. I let the duct cool before trying the fit on the TB.It took a few times to heat and stretch the duct so it would fit the TB but it worked. I was able to re-use the original clamp too
Melting Slicks
Joined: Aug 2001
Posts: 2,516
Likes: 0
From: Lockport NY
+ 1
I used boiling water and a couple of tapered 2x4's to stretch the mouth...
If the Archives here are Searchable, you'll find several members used a section of traffic warning cone to make the inlet tract...You know, those orange cones used by emergency street workers to keep traffic away...
I used boiling water and a couple of tapered 2x4's to stretch the mouth...
If the Archives here are Searchable, you'll find several members used a section of traffic warning cone to make the inlet tract...You know, those orange cones used by emergency street workers to keep traffic away...
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 8
From: Tampa Florida
I did a similar variation:
I used one of those Harbor Freight wooden "clamps" (see link below) a blow torch instead. The clamp works well because they can be inserted into the bellow and loaded up to actually "spread" the duct. Once clamp's "spread" tension is on the duct - I used quick direct heat (yep flame on) from a hand held blow torch to get the boot (only where the big "hose clamp" goes) into a slightly pliable state. Once heated - quickly slide the boot over the TB lip before it cools/shrinks. Install the hose clamp and your done.
http://www.harborfreight.com/12-inch...lamp-4854.html
I used one of those Harbor Freight wooden "clamps" (see link below) a blow torch instead. The clamp works well because they can be inserted into the bellow and loaded up to actually "spread" the duct. Once clamp's "spread" tension is on the duct - I used quick direct heat (yep flame on) from a hand held blow torch to get the boot (only where the big "hose clamp" goes) into a slightly pliable state. Once heated - quickly slide the boot over the TB lip before it cools/shrinks. Install the hose clamp and your done.
http://www.harborfreight.com/12-inch...lamp-4854.html
