5TH & 6TH STUDDING

[Type 4 Unleashed]

Instead of going off topic on another post I'll start a new topic.

Here's a pic of a studding option I liked that I posted about earlier, it requires a little more machining. The cyl spacers provides a dual purpose, and if I were to go this route I would make 2 1 piece spacers instead of 4 single, I think it would provide better support and I wouldn't bother with the cooling fins. These were done by someone on the other side of the Pond:

Cyl Spacers.jpg

Here is an option to what was done on this side of the Pond, a considerable amount of welding to the case is required not including the gussets for support in the 1st pic, and if you have a stroker & long rods,. you'll still need cyl spacers . Regardless how the studs become attached, either stud setup will require about the same setup on the heads:

CIMG1800-1.jpg

CIMG1797-1.jpg

There is a double benefit from the welding for the top stud, the 1st one is of course being able to use a stud, the 2nd is, the welded area reinforces the sealing area of the deck for the cyl, where before the cooling fins started right at the deck, and so this area was prone to leaking on big bore motors due to the area machined away for the big bores, which weakened the decks, as is the bottom opposite the top for the same reason. I myself have had these areas welded for support alone when changing seats. And I only recommend welding on heads if your replacing seats after, I have heard people have gotten away without replacing seats, but there have been other who haven't.

CIMG1799-1.jpg

CIMG1798-1.jpg

[wreck]

I like this method that Megamanx posted a little while ago . This one is done by Wayne Penrose in Australia . I'd like to do one similar one day for a supercharged (M90) engine . but not that the top bracing across the case .

6 stud plates 1.jpg

6 stud plates 1.jpg

[Type 4 Unleashed]

I Finally found the pics of the spacer plate I'll be using, and a 5th & 6th stud can easily be added should I go that way, these plates were made by a machinist for his Turbo motor build with Scat Split Ports:

DSCF1377 (1).jpg

DSCF1373.jpg

DSCF1374.jpg

[cal 67]

I'ma give some input based on some personal findings with sealing: the top stud is an excellent addition. The bottom stud, as pictured doesn't do anything to help sealing. Look at it. There's no bridging there. The stud goes into the rocker box, but how does it help to further clamp the chamber over the barrel?

There's a tiny patch of 1 1/2" wide fins near the exhaust exit. With a bare head, fill those in, drill a hole offset from the center of the bore, and attach your nut there and clamp directly against the chamber -- same as the top stud is doing. This is how Autocraft heads seal with six studs, and they were brilliant for doing it. Make sure to emulate this on your cylinder torque plate as well, OR use Deutz barrels, which resist warping. They deflect about half as much as standard big bore cylinders.

I don't really understand the desire to make mounting do complex. Why the plate?

[Type 4 Unleashed]

And as to "Why the plate?", I prefer the plate to welding the case, the 5th & 6th stud blocks welded to the case only provide localized support, where the support of the plate can't be beat.

Is this what your talking about:

2008_0816Image0007.jpg

[Type 4 Unleashed]

Here's some pics from PAUTER for their idea for 5th & 6th stud option.

VWspecific_15.jpg

VWspecific13.jpg

VWspecific_12.jpg

[cal 67]

And as to "Why the plate?", I prefer the plate to welding the case, the 5th & 6th stud blocks welded to the case only provide localized support, where the support of the plate can't be beat.

Is this what your talking about:


2008_0816Image0007.jpg

That is a pretty good idea, but no. In the pic at the end of that welding it runs into that small patch of fins there under the chamber. Fill those in. That can be your mounting location with a 12-point flange nut for exhaust clearance.