bored out throttle body

Reply Subscribe

Thread Tools

Search this Thread

Feb 23, 2009 | 06:00 PM

parkerbabco

Thread Starter

Senior Member

Joined: Dec 2008

Posts: 831

Likes: 1

From: Punxsutawney Pennsylvania

Year: 1988

Model: Cherokee

Engine: Renix 4.0 I6

bored out throttle body

does anyone know what the exact stock bore is and how much people usually bore them over???

Feb 23, 2009 | 06:20 PM

98 JeepJeep

CF Veteran

Joined: Oct 2008

Posts: 2,543

Likes: 5

From: Stafford,VA

Year: 1998

Model: Cherokee

Engine: 4.0

the get bored out between 62-64MM

Feb 23, 2009 | 06:22 PM

parkerbabco

Thread Starter

Senior Member

Joined: Dec 2008

Posts: 831

Likes: 1

From: Punxsutawney Pennsylvania

Year: 1988

Model: Cherokee

Engine: Renix 4.0 I6

thanks for the info... i have a boring machine at my shop so im gonna take it there and see what i can do.. any tips on doing this???

Feb 23, 2009 | 06:25 PM

98 JeepJeep

CF Veteran

Joined: Oct 2008

Posts: 2,543

Likes: 5

From: Stafford,VA

Year: 1998

Model: Cherokee

Engine: 4.0

nope i bought one already bored.

Feb 23, 2009 | 08:30 PM

xjjeepthing

Short Bus Motorsports

Joined: Mar 2008

Posts: 1,111

Likes: 7

From: Plymouth Indiana

Year: 2001

Model: Cherokee

Engine: 4.0

I think you can only go 60mm with out a new butterfly

Feb 23, 2009 | 08:46 PM

xer0

Seasoned Member

Joined: Dec 2008

Posts: 498

Likes: 0

From: rehoboth, MASS

Year: 2000

Model: Cherokee

Engine: 4.0

http://www.go.jeep-xj.info/HowtoTBboring.htm might be something for you to read

but the top half of the TB is 60mm. and so is the butterfly valve, so if u wanted to bore out to 62mm you would to have to make a new butterfly valve, i think it is called a throttle plate, with the edges feathered correctly. For the amount of work involved and the small amount of gains you're probably best option is to go 60mm through the bottom half to match the top. hve fun

Last edited by xer0; Feb 23, 2009 at 08:53 PM.