U-928

Anyone in the 928 crowd here have any experience extrude honing engine parts?

911 guys are hit and miss, from the research I've done so far.

Looking into having a 16V Intake manifold done, no pricing yet, still waiting on emails...

Fabio421

There are many threads about this from the past. The general concensus is that it is slightly beneficial but not nearly as much as just using a Euro intake to begin with.

tmpusfugit

I got a quote for a fairly simple pair of heads and simple intake manifolds...many hundreds of dollars....

BC

It SHOULD be beneficial, but the 16V pipes are such that their limiting factor seems to be tier overall shape and thier ID

Extruding works better on more compromised inner shapes, ridges, sharp interuptions, etc.

BC

Its also quite expensive.

U-928

The place I've asked has told me I'd need to speak directly to Extrude-Hone for a quote. But from what I've read elsewhere, I'm guessing in the $600+ area.

Guess I'll start looking for Euro intake stuff...

tmpusfugit

My quote from them was several times that....

WallyP

You might want to take a look at our clearance pages - first item is a polished S manifold set...

DR

I know where a complete Euro S 16V Intake is for less than that...and it's Polished too....and includes the matching polished Oil Filler neck :-). Even if you don't like the polished look, it is nice and smooth ready for P-Coat.

LINK > http://www.928gt.com/928clearance.htm

U-928

Saw that, but what's the deal with that mating up to the '84 throttle body? Isn't a euro TB bigger as well? Would seem counter-productive to put a larger intake after the non-matching TB. Then again it has to pull everything through that foolish flappy vane meter....

James Bailey

Part of the honing cost is making plates which will bolt to the flanges or ports. I also believe that they manually grid on the items as far in as they can reach or you can see. Then they pump the abrasive mud to polish out the grinding marks and POSSIBLY open up the areas that you can not see......The also need to be careful not to get it too thin or apply too much pressure in the process or the parts are junk.

U-928

This I don't believe they do. Especially from reading peoples' experiences elsewhere. Some sites specify that what you're thinking they do, they will do, but for an additional price.

Taken from HERE

I would have portmatched to my specific gasket size then have had the intake extruded, but the cost right now I'm thinking isn't worth the $.

James Bailey

O K what I inspected was then a level II intake because I could still see some small tool marks which had not been polished out all the way...

DR

No Problem to mate to an 84 TB L-Jet to Euro S Intake.

Yes Euro TB is slightly bigger.

Don't forget that the 8 runners are also a larger diameter, which is where most of the gain is, which is why most people Extrude Hone them to start with :-)

In case you are interested, I also have the matching "polished" used fuel rails and also the metal fuel lines and injector retainers, all of those are basicaly new(still have the Made in Germany stickers on them) and will include any or all of those items for a little extra. Basically everythin in the "installed photo" is up for grabs.

Also have "Like New" (not rebuilt) LH Euro S injectors too (not compatible with L-Jet)...heck come to think of it , I think I have almost everything here to convert your L-Jet to Euro LH...then you can Sharktune it :-)

slate blue

The photo below gives you an idea of the two of the intake runners used on the 928. The one on the left is the S2 intake, note the near 180 degree bend and the restriction near the injector. The S runner is much better with no restriction and only a 90 degree bend. The 90 bend is still far from perfect, the intake that I made below is better again. Much more gentle curves which are better for less restriction.





I don't think extrude honing is needed, I used a die grinder and a ball hone which did a perfectly good job. It also wont make much difference what you do when you use an intake with such a big bend in them.