The Motordyne Iso Thermal plenum spacer adds 12HP-14HP and reduces the effect of power robbing heat soak by thermally isolating both the upper and lower plenum. Its 5/16" thickness provides the best overall performance and is fully compatible with your engine cover and strut bar.
All Motordyne Iso Thermal systems keep your upper and lower plenum cooler without the risk of throttle body freezing when driving in cold weather. Installation is fast and easy; other than unbolting the stock collectors to switch in parts, nothing else is modified or changed. All Motordyne melt proof plenum spacers come with pre-attached, high quality gaskets.
There are two sizes of plenum spacers to choose from and each offers an advantage for different applications. Both add power and a deeper growl under the hood. The 1/2" spacer typically yields 1 to 1.5 HP more than the 5/16" plenum spacer.
For turbo charged and super charged vehicles, the gains can easily exceed 17-23 HP.
Item Details (for those of us that like all of the info):
The new Iso Thermal system combines our aluminum plenum spacer with thermal management components that substantially reduce upper and lower plenum temperatures. Cooler intake air temperatures increase air density, reduce the tendency for detonation (ping) and that increases engine power.
The first component is an Aramid thermal isolating gasket that is installed between the lower plenum and intake manifold. By installing the Iso Thermal™ Aramid gasket between the intake manifold and lower plenum the heat transfer is significantly reduced and both the upper and lower plenum assembly run at much lower temperatures.
The second component is a throttle body Coolant Control Valve (CCV) that allows you to heat (or not heat) the plenum assembly. With local weather temperatures below 55’F the valve is left open. In warmer weather the valve can be closed for maximum performance benefits.
The third thermal management component is the new Iso Thermal plenum internal supports. The plenum internal supports are self retaining and self sealing.
All Motordyne products are for off road use only.
for a dyno graph comparison
for a bar chart summary of the dyno data.