Our K20Z3/ K24A2 water
bypass adapter allows RAA, RBC, RBB, and RSP cylinder head owners to run the more popular aftermarket intake manifold options that were designed for the earlier PRB/ PRC flange. The PRB/ PRC style manifolds do not have an integrated coolant passage so the coolant bypass hole is left open when used together.
Even if you don't plan on running a PRB/ PRC style manifold... there are plenty of benefits that make this product a must have! The biggest benefit is in the reduction of intake
manifold temps by eliminating the heat transfer/ heat soak
associated with hot coolant running through the manifold. By modifying the
manifolds flange (cutting off coolant portion) and running our adapter the coolant is kept away from the
manifold completely, just like what you would find on the earlier PRB/ PRC
heads, so NOW your Hondata IM gasket will really work!! We've seen drops as much as 18°!! Not to mention, the
additional benefit of no longer having to drain the coolant when removing
the intake manifold for maintenance or swaps... makes things a real SNAP!
We recommend a TracTuff Bypass Hose Fitting when connecting the OEM bypass hose.
Start by installing the o-ring into the recess on the adapter’s
backside. Set the adapter aside.
Grab the stainless steel link
and longer 40mm Genuine Honda flanged bolt and install the bolt into the smooth
hole in the link.
Install the bolt and stainless
link into the right-most intake manifold flange bolt hole. Tighten lightly with
the link facing upward.
Grab the shorter 28mm Genuine
Honda flange bolt and adapter and install the bolt into the lower bolt hole.
Take the bolt and adapter and install it over the
exposed water & egr ports. Thread the bolt into the cylinder head until it
is hand tight. Do NOT install the adapter over a gasket.
Grab the stainless steel set screw
and thread it into the stainless link. The pointed set screw will tighten into
the hole well but in some extreme cases it may be a good idea to use some
medium grade Loctite.
Swing the stainless link and
set screw down until it lines up with the pilot hole of your choice.
Tighten the 8mm intake manifold
and Water Bypass bolts to 18 lb. ft. of torque and tighten the set screw until
you have sufficient crush on the adapters o-ring. Congratulations! You're