Topic: help for an 87 2.5

[dudley]

Since no throttle body spacers are made for the 87 2.5, would having a spacer made, but without the spiral on the inside, help at all?  Would it give a slight "high rise" effect?

[jfrabat]

Theoretically speaking (keep in mind, however, that I DO have a spiraled TB spacer!), the smoother the whole intake part, the better the flow of air.  Laminar flow (which is what you get when air flows without turbulance) allows for the fastest flow of air, so a spiral would actually slow the air down, reducing the amount of air the engine can breath, and thus energy...

Having said that, the reason I do run a spiraled TB is that the above is true for WOT.  But in partially opened throttle, the spirel could possibly help to improve the flow (in my opinion, anyway).  I have yet to do tests to prove this, but I have heard from some people that you get more power from the 4.0TB without a TB spacer than with...

Felipe

[flyingbrick]

yes it should give you more power cause it would give more time for the fuel to atomize before the 90*turn into the intake, I'd go at least in inch if all the lines will still fit. if you have a friend that can do the machine work for you it should be straight forward.

[dudley]

Theoretically speaking (keep in mind, however, that I DO have a spiraled TB spacer!), the smoother the whole intake part, the better the flow of air.  Laminar flow (which is what you get when air flows without turbulance) allows for the fastest flow of air, so a spiral would actually slow the air down, reducing the amount of air the engine can breath, and thus energy...

Having said that, the reason I do run a spiraled TB is that the above is true for WOT.  But in partially opened throttle, the spirel could possibly help to improve the flow (in my opinion, anyway).  I have yet to do tests to prove this, but I have heard from some people that you get more power from the 4.0TB without a TB spacer than with...

Felipe

Thanks, Felipe. I was thinking the same. But, I have understood a 4.0 TB won't fit the bolt pattern for the early (pre-1991) 2.5 manifold, thus the reason for no spacers made.  It is simply too specific to very few engines, so not cost efficient.  Do you know something different?

[jfrabat]

Sorry, no, I dont know of anyone making the TB spacer for your engine...

[dudley]

yes it should give you more power cause it would give more time for the fuel to atomize before the 90*turn into the intake, I'd go at least in inch if all the lines will still fit. if you have a friend that can do the machine work for you it should be straight forward.

My thoughts also on more atomizing time. Time to get out the tape measure and see. I will also have to worry about the hood clearance.

[dudley]

Sorry, no, I dont know of anyone making the TB spacer for your engine...

I also know of no spacers made, but I was asking about if you knew different IRT any 4.0 TBI fitting the early 2.5.