Also, I've read about many "carburetor replacement" EFIs that use carb-style manifolds, but I've never heard if these types of units would also benefit from the increased plenum area offered by spacer blocks. Could you shed any light on all of this? If there's big drops of wet fuel instead of an ideal fine, homogeneous mist, performance will be adversely affected. By raising the carburetor higher, there is more time for the fuel to gently turn in to the intake runners, plus less chance of the charge bouncing sharply off the plenum floor.
Additionally, changing the effective intake plenum volume and height with a spacer may change the intake manifold's tuning resonance, somewhat analogous to playing with exhaust header tube and collector lengths and volumes.
Whether a spacer actually will benefit any particular combination is kind of a crapshoot. There's a nearly endless amount of potential intake manifold, camshaft, carburetor, cylinder head, exhaust headers, engine bore and stroke relationships, and spacer configurations and heights, so no one really knows "for sure" whether any given spacer will help or hurt a specific overall package.
As Wilson Manifolds' Keith Wilson puts it, "An intake is like a camshaft—they're both infinitely adjustable. OblivioAssebit said:.
Dude, I wouldn't waste your money on a TB spacer, it does nothing for our cars. I actually bought a bigger TB with a 57mm bore. I love it, not only do I feel a difference in power but it sounds awesome too. Almost like the spool of a turbo, and its loud enough for people to hear outside too.
There are few modifications that seem "worth" their price given the performance gain if any. Intake manifold spacers, however, can significantly cool the intake charge. It's not necessarily true that the manifold reaches the same peak temperature with a spacer as without. There have been numerous test performed using dynamometers to confirm this assertion. Lol have you ever owned a turbo car? I've herd that TB spacers can actually give a little whistle, i'd imagine that is what he is referring to.
Very different things. Yes, the plenum spacer DID help a g35 I was working on for a friend. I felt a difference, barely. TB spacer? You must log in or register to reply here. Similar threads. Replies 17 Views 2K. May 2, jrohner. Replies 8 Views Jan 11, darkrage.
Throttle body. The plenum acts as a sort of air reservoir for the cylinders, ensuring that the runners always have oxygen on tap regardless of rpm. Increasing plenum volume with a carburetor or throttle body spacer doesn't make power, per se -- rather, it's one way to correct a problem foisted upon you by corporate bean counters. You might see some improvement in fuel economy, but it's fairly unlikely unless the engine desperately needed the extra plenum volume. In fact, the engine may respond to the additional airflow by increasing the amount of fuel injected, which could cause a decrease in fuel economy.
Throttle body spacers can work in some applications; all engines are different, and it's not impossible that the additional plenum volume could help to compensate for a deficit from the factory. So you may see a bit more horsepower and midrange torque, depending on the car. Top-end horsepower may be a sacrificial lamb on its best day, but tiny gains in fuel economy are liquid gold to auto manufacturers.
Richard Rowe has been writing professionally since , specializing in automotive topics. He has worked as a tractor-trailer driver and mechanic, a rigger at a fire engine factory and as a race-car driver and builder. Boundary Layer and Grooves Here's a bold statement, backed up by about four centuries worth of physics: Any manufacturer that claims its spacer induces a helpful straightening or swirling of the air is -- wait for it -- lying.
Chlippo Registered User. MAG58 Registered User. Dearlove Dearlove. DieselPaul is thinning the herd. Quote: Originally Posted by DieselPaul The VQ35 guys do make actual WHP off of those plenum spacers but if you look at the design of the intake manifold on a VQ the plenum is pretty big so you're adding a larger volume of air than just a throttle body spacer.
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