Jump to content

throttle body spacers


Recommended Posts

I read somwhere that one for a 4.0 will work... it was a Power Aid 4.0 spacer PN 310-510.... they said it will bolt right to the 2.5. and that the spacers work better on TBI setups than they do on port injection setups like the 4.0 has. If you get one and notice any difference let us know, I'm contemplating one for my 2.5 as well.

Link to comment
Share on other sites

The best results from spacers will be found on TBI setups... THe purpose of a spacer is to mix and increase the volume of available fuel air mix. So on a MPI, where fuel comes in just before the head, it won't do much... But on a TBI, it stirs the fuel air mix before entering the manifold, and will increase volume, equaling a more noticeable, but not much, gain in performance.

 

TBI, go for it. MPI, get something else.

Rob L.

Link to comment
Share on other sites

The best results from spacers will be found on TBI setups... THe purpose of a spacer is to mix and increase the volume of available fuel air mix. So on a MPI, where fuel comes in just before the head, it won't do much... But on a TBI, it stirs the fuel air mix before entering the manifold, and will increase volume, equaling a more noticeable, but not much, gain in performance.

Well ... you're close.

 

A throttle body spacer CAN'T increase the volume of air. How much air gets sucked in at any given RPM is determined entirely by the bore, stroke, and camshaft specs. The air path from the inlet of the throttle body to the intake valve on the head is nothing but a pipe, and the spacer just makes the pipe longer. Yes, there's more air in the pipe, but that doesn't put any more air through the intake valve per revolution.

 

What the spacer can do on a TBI is, as you stated, increase the turbulence and thus enhance the mixing of the fuel droplets with the air column flowing through the manifold. And that's why there's more benefit from a spacer with a carburetor or throttle body injection than with MPFI, because with MPFI the column of air in the "pipe" is dry, and the fuel doesn't get injected until the air gets to the intake valve.

Link to comment
Share on other sites

:agree: with eagle. Its all air till it hits the head. I did get one for my 87 mj with 4.0 from rustys and that was my second mod on my truck after the cat back exhaust i did. I did feel a noticable difference in it. It had a swerl grove inside the spacer which turned the air while going through the intake into the head.

Link to comment
Share on other sites

I have always thought that they were a waste of money but in my digging at the junkyard today I got one and the guy decided not to charge me for it, so no money wasted. Once the weather is consistently cold, I'm gonna run two tanks of gas and record my fuel economy without it, and then do two tanks of gas with it. I'll report fuel economy and if I notice any difference in power. So keep your eyes open around January.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

×
×
  • Create New...