Pulling the plenum / IH Some pics !!

[A26B]

Originally Posted by 5ABI VT

I haven't taken a closer look at where the o rings seat.. Is there a groove in the injector housing where they seat or do they seat on the injector and are just slid into the IHs? I'm assuming there's one seating it to the rail and one to the IH per injector ? Maybe I'm just confusing myself uh reading too many threads !

Definitely plan to clean all the bolts and pieces on re-assembly. Everything Is relatively clean except in the valley. The top end was off not too long ago for the pc refinish that's most likely why the cleanliness . I have msd coils I picked up as spare but I'm debating on leaving well enough alone for now. Even having thoughts of new injectors.. The 'while you're in there' bug can get expensive real fast !

For 93~95
Top & bottom injector o-ring seals are the same. There is no receiver area in the injector housing.

To install after new O-rings are on the injectors, just lube the o-rings lightly with a little motor oil on your fingers. Install all the injectors in the rails first. It's easier to put the clips on. Then line up with the injector housings, press down & wiggle until the rail brackets are down on the injector housings & bolt them in place.

[A26B]

Looks like you need to "exercise" your secondaries more! Have some fun with that thing. The greatest travesty is to have to discard tires because of age.... that still have tread on them.

[batchman]

Originally Posted by A26B

Install all the injectors in the rails first. It's easier to put the clips on. Then line up with the injector housings, press down & wiggle until the rail brackets are down on the injector housings & bolt them in place.

Jerry - that post was *just* in time for me - thanks!
- Jeff
(pondering what I've forgotten before flopping the top back on)

[5ABI VT]

The secondaries get too much exercise from me most likely deposits from relaxed driving from previous owners.

What are the stock sizes for primary and secondary ports ?

[A26B]

Originally Posted by 5ABI VT

What are the stock sizes for primary and secondary ports ?

Injector Housing; Cylinder Head side
Primary = 32mm
Secondary = 36.5mm

[5ABI VT]

Well I'm not sure if I'm disappointed I won't be making more power or if I saved some $$$.. But it looks to me like this top end has been ported already. Ports on plenum are the same size, one end of the ih are the same size and you can see where it stopped in the IH.. Cylinder head side of the IH are what look to be stock sizes with secondaries larger than primaries. Going to buy a caliper tool to measure.. Pics to come

[LGAFF]

94 primaries are 33-34 at the top of the IH.....you can tell if its ported, it would be smooth in the runner vs cast

[5ABI VT]

Are primaries and secondaries both 34mm ? I feel a little relieved as they are 34mm or slightly over depending on where I put the digital caliper I just picked up. Primary and secondary ports are 34mm at the top

[5ABI VT]

Ok so here are some measurements ...

Plenum ports all appear the same size. About 34.3-34.5mm give or take.

Injector housing TOP side. I double checked .. The side mating to the plenum. 34.3 - 34.5 mm on all.

Now here's the interesting part ... The cylinder head side (bottom) of the injector housings ... The primaries are 33-33.6mm

The secondary ports are as measured across ..

37.4 36.85 37.4 36.91

Not quite sure how this happened or if it's supposed to be like this but these are the largest port sizes.


Going to measure the cylinder head now...

[5ABI VT]

At the heads . Primaries are 33. Secondaries 36.5. Give or take a few this caliper tool isn't the most accurate or steady. Pics coming right now ..