bhmyers

I installed a new intake and fired it up yesterday evening and noticed white or perhaps a little grey smoke. The new intake is a high rise, would that throw my fuel mixture off enough to burn white smoke?

bhmyers

need help guys, anyone?

Phil Zell

Sounds like a little water may be getting into the combustion chambers, did you clean all surfaces well?, befor installing the new gaskets, and did you get the correct gaskets for your particular intake?

Hope you get it straightened out.

bhmyers

Yes it is possible that water got in during the installation but it should burn off pretty quick. I will have to check this evening to see if it cleared up due to a little water or if the problem is still there. any other thoughts?

78 Vette

The bottom of the intake ports may be leaking you can correct this by using thicker gaskets. This is fairly common when you swap to an aftermarket intake. Sometimes it is noticeable if you look at the 2 mating surfaces. You might be able to notice the bottom has a wider space than the top . Hope this helps. It can also be as mentioned previously. good luck

bhmyers

So what gasket would you recommend for AFR 190 heads and a Power plus intake?

gkull

If it runs fine I would go a jet or two up in size first before chasing a manifold vacuum leak.

When you go to larger volume plenum manifolds richer jetting is normal.

bhmyers

cool, I hope that is the problem, Should I only go up a jet size on the primary?

verskel

I'm thinking you may need to increase jets on the secondaries as well if you can. In the upper RPM's you'll be using the secondaries and that's where the larger HP increase is with that manifold. ;)

However, it won't hurt to change the primaries first, then run it. If the car runs good then you'll be fine. Sometimes increasing the jets too much only makes the car run richer & burn more gas. :chevy

gkull

If you don't have a sniffer and rear wheel dyno time available. go up one jet size front and rear and then have someone follow you for testing. big 4 squirter double pumpers will have an initial blast of black smoke when you stomp on it, while locked in second gear from from 2000 or so rpm. But after the squirt the right jetting is no white - no black. You shouldn't have anything visible