Blown Oxtboxer with stock 12mm head studs ?

[Unkl Ian]

Has anyone made an Oxyboxer,using the stock head studs.

I think the Type 1 studs are 8 or 10 mm,Type 5 is 12mm,
so they should be stronger.

The long term concept,is to supercharge or turbo the 2 liter motor,
for Bonneville,using Competition Eliminator heads with water jackets welded on.I understand CE heads are available with the bolt holes undrilled.

Probably 4" bore,Chevy pistons.stroke to suit,2" Chevy rod journals,Carillo rods,2 plugs per cyl,Megasquirt EFI.

Any ideas,or suggestions ?

Thanks.

Ian

[Piledriver]

IIRC the WBX studs are 10mm, but are known to hold plenty of boost...

Bigger custom jugs would need an oring seal to the block (could go in block or on jugs...), I'd probably stick'em in the stock water jacket and do something like an Evans cooling setup, water into heads first, then out of the block, using an external pump, zero pressure.

Having everything water cooled has it's advantages, esp under boost.

For a seriously blown motor, 55mm VW journals are probably better than a few extra CCs.

[Unkl Ian]

I've got some Carillo rods,2" journal,.912 pins,5.6"(?) long.
Bolts go the wrong way,so I can't use them in my street Type 4
with the 80mm stroke.

No problem getting pistons in almost any size for normally aspirated.
The shorter stroke,was driven by the availability of "blower pistons".
A quick search showed the smallest size available was 4.00".
With the stock crank69mm(?),that makes the motor over
the class limit of 2015cc.

Didn't want to go to the expense of custom pistons.

Could always get the crank welded,and destroked,
to run the stock dia rod journals.That shouldn't be a problem.

[Unkl Ian]

I don't know anything about WBX heads,besides the small combustion chambers.

Need to chop one up to see if it has enough meat in the right places.
for big ports and big valves.

Would have to weld a deck plate in the block to support the tops of the cylinders.
Did that on a 944 10 years ago.Now it's common place with the import crowd.

Comp Elim was one option,so far.

[Piledriver]

Check out Marcos head pics if they are still in the forums, basically he had T1 valves installed (recessed seats ~5mm) and cut some ~35cc chambers in.

The cylinders seat inside the WBX heads...

AFAIK the WBX heads can be made to FLOW fine, and dicthing the extra long valves allows them to rev like a T1...
(But Marcos intake ports are a bit large, as some porosity reared it's ugly head)

With relocating the ex valves, you can run the usual hugish valves.
(Takes T1 rocker gear, you lose ~.100" of installed height to the intake port tho)

The CEs almost certainly will flow better though, and would probably be less work.

Adrian at HFM does WBX heads, not sure to what level tho, type5joe (haven't heard from him in a long time) does the full meal deal AFAIK, does a lot of wild WBX powered sand rails IIRC, set up to shuffle pin etc.

For that matter... a 1.9 crank already HAS 55mm journals... Stick some H beams on there with some 96s in bores WBX stock jugs... Some of the T4 ones w/22mm pins would probably work well, as likely would the 95.67mm dished 305 slugs, assuming 1984cc is OK...

I'd go all T4 mains and 55mm journals if I had to design it, the cost difference isn't really significant when you look at the full budget.

[sideshow]

With a t-5 the head studs are slightly shorter (and not deep studded) than a t-1. The builder makes the call on 8mm verses 10mm. But if you are boring to 4 inch, you could leave the holes alone.

The wasser uses odd what I would call stretch studs, 8mm'ish centers with big threaded ends.

So in you project are you water cooling the barrels?

[Piledriver]

If you need the dimensions of std WBX barrels, I have some loose ATM.

[Unkl Ian]

With a t-5 the head studs are slightly shorter (and not deep studded) than a t-1. The builder makes the call on 8mm verses 10mm. But if you are boring to 4 inch, you could leave the holes alone.

The wasser uses odd what I would call stretch studs, 8mm'ish centers with big threaded ends.

So in you project are you water cooling the barrels?

Projected run time is less than 5 minutes,so my first idea
was air cooled cyl with water cooled heads.

NA needs 300 hp to be competitive.
Blown probably needs 600,maybe more.

The records have been soft for a while,now GM is running the same class.

The new size limit for G is 2015cc.

Something tells me the 94mm barrels won't like 600 hp.
Nickies would be first choice,or some thickwall sleeves from Darton.

[51MAN]

Have a word with Marco.. think he can tell you what to do to get that.... Sure he had a 1.9 stock engine with a big turbo pushing over 400 on pump gas..... could be wrong though!!!

[Piledriver]

I think it was ~450hp from a 2.1 with heavily modded stock heads, 28 PSI, pump gas.
The 1.9 was basically stock IIRC and did ~230.

The CEs might just get you there with rollers and ~35-40 PSI, but I suspect water cooled jugs would be a good idea. The Nickies could be quite thick wall in a WBX as long as you kept the bore size down to ~stock. A custom ground crank so you could hit the classes max displacement might be in order...

So you're thinking of competing against a factory team running Ecotecs with a 2 valve engine based on a ~80 year old design?

You got biguns

Not having the head studs rip out of the block may be an issue at that power level.

[Unkl Ian]

So you're thinking of competing against a factory team running Ecotecs with a 2 valve engine based on a ~80 year old design?

You got biguns

Yeah,we are debating classes right now.

We used to run all over the well financed teams in SCCA Can Am,
but we were a lot younger then.

[Piledriver]

Another depressing though I had driving in...

The 2.0 Ecotec at ~600HP probably has an o-ringed block... ~Stock otherwise internally. (not including cams/headwork)

Any advantage would be from having a VW and possibly being allowed to have a smooth floor.


I confess to having seriously looked at putting one of these in a 914.