Wondering where the best place is to pick up a HO manifold adapter for an 00 LD9? I have found that OEM makes one but am curious to know if there are any others and whats the best one for a smooth transition.
As far as I know only OEM makes them, maybe someone over on quad4forums can help you out or every once in a while you find them in the classifieds. Ill have an extra soon but its been modified for the pcv when I was n/a and kinda had it fixed with rtv since Im turbo, but just got another with another ho manifold I got.
The OEM one have a pretty smooth transition? I will probably order it from them if I don't hear back from someone I messaged. Are longer bolts/studs needed to fit the spacer and the HO manifold?
is it even needed, I have heard of some people not using one, whats the purpose of it?
Darkened wrote:is it even needed, I have heard of some people not using one, whats the purpose of it?
You can go without one but you need to dremel both the head and the intake to match up the ports, the flange does this for you and smooths the transition of flow. Also the flange helps to prevent heat soak from the engine to the manifold. every 2-3 degrees cooler intake charge is 1 hp more.
Darkened wrote:is it even needed, I have heard of some people not using one, whats the purpose of it?
The Quad4 and LD9 have different shaped ports. The flange provides a smooth transition from the "oval" shaped HO manifold to the "B" shaped ports of the LD9 head. The only way you don't "need" the flange is if you weld material to the HO manifold and match it to the head that way, which is worth neither the time nor the effort.
Without the smooth transition, you create unnecessary turbulence destroying both airflow and resonance effects...effectively making the swap a downgrade (at least more so than it already is on a stock engine).
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heres the pics of the phenolic adapters
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Quote:
every 2-3 degrees cooler intake charge is 1 hp more.
I get so tired of that quote
I have one of those adapters sitting on a intake mani right now..... and I'll prob never use it. Since I know it wont make my car any faster.... Looks cool though.
the ho mani only makes stock stock motors slower... with a cam upgrade and ported head, you will see gains with it...
the phenolic spacer (which was not used on the dyno test that showed a 10 hp loss) keeps the manifold cooler, which does make a difference...
being cooler cant hurt though
it keeps the mani almost as cool as the stock plastic one
I'm hoping to pick one up in the next day or so...my motor is out this week and its being built and then I need to get my turbo stuff. MP45 + other stuff for sale soon.
ok so I need a spacer then as my motor is upgraded lol
Darkened wrote:ok so I need a spacer then as my motor is upgraded lol
if you plan on running an HO manifold and not weld on a 2.4 flange
I am going to pick up an adapter from OEM and see they have gaskets listed with it. Wondering if 2 gaskets are needed for the spacer (one on either side)?
yes yes ... you need 2 2.3 gaskets which need to be modified as well to match the slots on the mani.
i have a quick question... im going to be picking one up from OEM as well, since my Fontana one is one of the originals and is off... my question is what is the difference between the ones with the pcv hole and those without... im not boosting my motor...
matt sorry it took so long to get back to you, but yes youll need two of the 2.3 intake manifold gaskets or you can just use rtv. with works fine ( i just used the later)
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