Compound pics

[greggearhead]

Any more compound updates?

[hillfolk'r]

that girdle is nice,but,the vw block is so strong,,look how far the crank is shoved up in there,known as a "deep skirted" engine,,usually,only weak crap like chevys and stuff need them,,see how a chev crank is almost on the outside of the block??? but thas ok,, overkill can b e cool especially when it works for you,not against you,,,,,,,do you think you were having a problem with block flex?

[935racer]

I imagine that that girdle will help keep the crank in check under high boost pressures, because he machined down the main caps there is more sureface area that is being clamped down now. The intake manifold, well I would just put it on a flow bench before I tried that to make sure you are getting even air flow across your ports, I would agree its gonna be better than the stock, but when you are playing with high boost you want your intake as even as possible.

[andy2]

We just figured that putting a girdle in could't hurt.The mains did move before causing the crank to run hard on the middle journal's bearings to the point where the crank was hard to turn with "new" bearings and mains torqued down.

Sure the manifold Isn't the best that could be made by someone,but making one "better flowing" probably would't help much.I think it will flow about 100% better than what I had .

Not too far off starting the engine just waiting for some things like an Hy35 etc.Someone was looking for an Hx30 so I didn't rufuse the cash toward's the proper turbo for my project.I believe the hx30's compresor was way too small to flow the kind hp I was and will be making.I don't really know much about turbos/sizing so it was kind of a trial and error process :oops:.In fact I believe the housing was restrictive enough that it was pulling oil out or the turbo in 35+ psi cases :shock:,Also causing higher Egt's too probably.

I'll post some pics of the assembly in the car when the Hy arrives.

[935racer]

Andy I think you are on the right track man, Thats why for the compounds I am building I am using hy35's, are yous till planning on running the stock k24 as your small? Yeah man taht girdle is tight, they are great for keeping the cranks in place. And yeah that intake manifold is a lot better than stock, but what isn't :lol:  they are pretty brutal. Get taht custom cam in there and get her all buttoned up I wanna see this thing rip

[andy2]

Yep running the k24 with the hy35.I don't want to push this engine until its broke in again.I'm definitely looking forwward to some back to back comparisons like 9 vs 12mm heads and your stg 3 cam vs stock.Should be interesting to see how the 18.5:1 precup's work too.Then some bigger nozzles,Too much to do .

[HP]

 Big project, man. Keep it up.  

[greggearhead]

So besides the "up-pipe", what supports are used for the big turbo?  A couple support brackets or something?

[VentoTD]

Nice work on that girdle!

I have been working on a similar thing. But I ran in to this problem, the main crank bearing lost its shape. The holes for the crank in the block got oval (not round..) they lost 0.1mm vertical, and increased in diameter 0.1mm horisontal. This vertical can easily be linehoned (grinded). But the problem is that because it got wider the bearings wont sit just right.

How hard did you torque it down? I followed the bentley manual..65nm + 1/4 rev

[andy2]

So besides the "up-pipe", what supports are used for the big turbo?  A couple support brackets or something?

Theres one support running from the side of the block to the "up pipe" thing.I had no problems before with that setup,however now that I've up sized both turbo's I may need another support :wink:

[andy2]

Nice work on that girdle!

I have been working on a similar thing. But I ran in to this problem, the main crank bearing lost its shape. The holes for the crank in the block got oval (not round..) they lost 0.1mm vertical, and increased in diameter 0.1mm horisontal. This vertical can easily be linehoned (grinded). But the problem is that because it got wider the bearings wont sit just right.

How hard did you torque it down? I followed the bentley manual..65nm + 1/4 rev

Thanks,Is your block an AAZ also?I'm begining to think this center journal movement etc is very common :?I guess with any aaz block its almost a must to get it line bored(not honed :x ) for rebuilding.The old bearing's must gradually wear as the block distorts,thats why the new bearing are causing the crank to be tight?I've heard of some rebuilt engines having center journal problems before,aaz's as well.

I installed 12.9 grade capscrews and using moly lube I torqued them to 50 ft lbs and didn't have any issues with that.

[hillfolk'r]

if main bores are gettin funny,it could have been run low on oil,leading to hi oil temps, itll actually try to"curl" the caps  :cry:

[935racer]

Yeah I have seen the mains lose their shape before, I'll be cncing soem girdles out along witha  few other tricks to keep the cranks straight on the crazy motors :twisted:

[VentoTD]

Yes AAZ.

So you have run the engine with that girdle?
50lb/ft is about 65nm.

My manual says angle tighten also by 90 degrees. Did you skipp that? And it works?

I've also used 12.9 bolts. When I use 50lb/ft force it works fine but that last 90 degree messes it all up.

The problem that we've had is that the main bearing (thing that bolts to the block) cracks and then the crank and pistons sits nicely in the oil pan...

[andy2]

Yes, 50 ft lbs final torque with the 12.9 capscrews also that was without the girdle.Running 37 psi boost it made enough power to bend rods and no main bolts were loose when I took it apart.Stock rods can basically take double the hp(145-155) before they bend :twisted:.