Ducman82

Just got my towers back from the powder coaters... look great! but........... looks like sandblasting got in the towers and hit the front and rear cam surfaces....

how screwed am i?

SeanR

It's a wall decoration now.

Ducman82

X 2........

this hybrid project is going to kill me......

Mrmerlin

actually you may be OK here as this isnt where the cam runs . the cam runs on the top surface as its pushed upwards by the lifters

If you do decide to use these then you should chase every thread ,
and wash it out a few times with simple green and how water and then a blowdry with compressed air

Ducman82

I'll check the top of the bore when I get home.....

BC

For anyone that has worked on 2v cars and taken them apart with the intent to put them back together, it would seem clear that the surface you show is at the front. The front of the 2v cams don't touch that surface. The seal on the front cam-bearing and cover housing does. Hence the reason we get broken 2c cams when the snouts are flexed too much.

Jesus people- let's be careful about telling others thier **** is stuffed, huh?

The back of the tower has a similar area, and that IS touching the cam. But I don't see it as a big deal.

What about the grey ones I sent. Are these them that you redid?

BC

I'd say ( and I don't say this lightly, and I have actually worked with 2v stuff) run it. Unless the sand blasting got at the lifter bores, then it's fine.

You have the front cam
Cover consoles that slide in there- mate them up and look at what I mean.

blown 87

Fixed!

But I have been told that if the pressure was not to high, that they will be fine, i would never run one like that though.

Ducman82

yes, this was the pair that you had PC, then i had striped and re done. i checked the tops of the "bores" and they look clean. the bottom face and lifter bores are all good.

Mrmerlin

then it should be OK just follow the info for thread chasing and the parts washing,
the more time you spend washing the less chance of contamination failure..
NOTE the cam when its installed is pushed upwards to the top of the tower so the cam wont be touching the blasted area.

Since these parts can be used on either side the front cam seal support will neatly fit into the blasted area ,
and its sealed with an O ring,
the rear is sealed with a cover and cork or silicone gasket

SeanR

If you'd use this in a car, that tells me a great deal about what you would re-use. He clearly states this is the case on both the front and REAR. Remind me not to buy anything you've worked on.

BC

Don't get your shorts in a wad Sean - relax. We haven't seen the pictures of the rear. And when I sent him the parts, I had the bearing surfaces properly masked off.

Again - I am questioning people here on how much they have actually worked on 2V stuff. The bearing clearances on these cam towers are huge. Absolutely huge, in a relative sense to other engine technology.

To do it properly, one would want to do an align-bore on cam boxes on every 928, and surface the bottom (and the top of the 2V heads where they mate) so it actually stays sealed more than 12 months at a time. Anyone do that?

I didn't think so. **** no- most people would slap that **** back together like it was legos.

There are several ways he can reuse these pieces, but it would be his own choice and his own car. The front is unimportant, and the rear bearing surface supports very little. These pieces are all of a couple hundred dollars in bare parts - the boxes themselves that is. He could always get more. But most of them are warped.

hacker-pschorr

That belongs in Blown 87's signature, or on the wall of his and Greg's shop.......

Ducman82

here are the two shoots, of the "top" surface on both ends......

Mrmerlin

those surfaces look OK make sure to chase the threads of all the openings,
if you dont you will see the bolts bind up as there will be grit media in the threads