Kenne - Bell throttle body

#1
I found a Kenne-Bell 70 mm throttle body for sale locally. Would they work on a mostly stock engine? Would I loose throttle response / longer spool up time ?
I`m also putting together a motor for E85 , stock block,ported irons,flat tappet 208 cam,80 lbs injectors. maybe it could be usefull on that motor ?
 

1986 Buick GX1

GX1 #001 [The One and Only]
#2
The Kenne-bell throttle bodies and plenums were made by accufab.
The up side is quicker throttle response. Example: at 10% throttle w/ 58mm = 5.8 airflow. 10% w/ 70mm = 7.0 airflow. More air at less throttle.

A 70mm T/B is not needed unless you are running in the 9's as the stock T/B has been in the high 9's.

The down side is when making more power with less throttle the throttle linkage is not pulling the TV cable for the trans as far as it needs to, thus the clutch packs in the tranny don't have as much pressure as they need and will start slipping sooner unless you have your transmission recalibrated.

Your money would be more useful elsewhere, but they do look really cool.
 

turbo nasty

Turbo Dojo / MNTR
#4
The Kenne-bell throttle bodies and plenums were made by accufab.
The up side is quicker throttle response. Example: at 10% throttle w/ 58mm = 5.8 airflow. 10% w/ 70mm = 7.0 airflow. More air at less throttle.

A 70mm T/B is not needed unless you are running in the 9's as the stock T/B has been in the high 9's.

The down side is when making more power with less throttle the throttle linkage is not pulling the TV cable for the trans as far as it needs to, thus the clutch packs in the tranny don't have as much pressure as they need and will start slipping sooner unless you have your transmission recalibrated.

Your money would be more useful elsewhere, but they do look really cool.
This isnt accurate at all. Trans is not going to burn up at part throttle from a larger throttle body! If thats the case all of our cars would have burned the trans up with a fixed throttle position and going up a grade and boost came on due to the load to climb the grade and throttle position not changing or changing very slightly a bigger throttle body isnt going to cause the trans to fail sooner!!
 

1986 Buick GX1

GX1 #001 [The One and Only]
#5
This isnt accurate at all. Trans is not going to burn up at part throttle from a larger throttle body! If thats the case all of our cars would have burned the trans up with a fixed throttle position and going up a grade and boost came on due to the load to climb the grade and throttle position not changing or changing very slightly a bigger throttle body isnt going to cause the trans to fail sooner!!
My apologies, I was passing along info I found in another thread that seemed to make sense to me, but must not be entirely true.
 

Nick Micale

Tech Advisor
Staff member
#7
About 20 years ago I decided to set my car up to run NHRA in Super Stock, and required the throttle body to be stock.

At a track test session with the car running mid-11's with a 70 mm TB, and changed the 70mm TB for a stock one, and no change in ET or MPH.