Compound pics - page 12 - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• #165 by foxracer1 on 20 Dec, 2006 18:00
• Sounds awesome keep it up man. Were gonna need some video of this monster.
• #166 by andy2 on 21 Dec, 2006 15:18
• Thanks,I just tried torquing my ARP head studs down to 120 ft lbs up from the 80 ft lbs using the moly lube as the lubricant.The 120 ft lbs torque in the insructions was only intended for use with motor oil.Anyhow I still have major issues so the head will come off and I'll see if the gasket had any issues and get the head checked out also.At least I'll be doing two jobs at once this time(turbo swap,head gasket) so it won't be a total loss :roll:
• #167 by deezul ryan on 28 Dec, 2006 10:13
• what is the story on the 2 rods?
• #168 by andy2 on 28 Dec, 2006 13:34
• Bent connecting rods?The stock AAZ ones seem to handle about 145- 155hp on 35psi boost.
  
  My repaired cylinder head was not repaired well enough as the weld is porous.Now I have coolant enter the intake port and then under load, boost in the coolant :x.Were starting fresh on a very good used head it will require some work for the larger pre cups and what not :twisted:.
  
  I reassembled the k24/14 turbo today ready for the hx30 again.
• #169 by deezul ryan on 28 Dec, 2006 14:29
• the last 2 pictures on your link on the first post.  2 different rods?  whats the story?  i am looking for better rods for a tdi.  i want it to stay together at 40 psi
• #170 by andy2 on 28 Dec, 2006 14:45
• That pic shows the AAZ rod and the TDI PD 100hp rod (BEW engine code) I believe.Which TDI engine are you hot rodding 1Z/AHU or ALH? I don't have to much hardcore TDI hotroding info as others on this forum,Prehaps others will chime with some info.
• #171 by deezul ryan on 28 Dec, 2006 15:38
• 1z I havent looked yet but i do have aa good used set of ALH rods
• #172 by andy2 on 29 Jan, 2007 15:50
• So we started from scratch with another cyl head and machined it to fit our custom pre cups and ported the head as well.I torqued the studs to 120 ft lbs using motor oil as the lubricant this time.I built up my k24/k14 combo this time and used the hx30 also.With a special "compound only" modded wastegate (QuickTD's idea) :twisted:  this time around it all works much better in terms of EGT's spool up and more importantly we have the compound effect working :wink:.Only one big problem though,After a couple of hardcore trips around the block the engine blows coolant out the overflow :x.On 29 psi boost and loads of power it looks like the headgasket has surpassed its useful limit.As I'm deaccelerating after the coolant blows out the engine stalls out as I want to down shift which I can only guess happens due to the loss of compression.Currently I'm thinking about what to do next,one thought was to moddifly a headgasket to add about .004 thou of additional crush around the gaskets sealing area "fire ring".Possibly moddifying the head as the cummins guys do may be an option??
  
  http://www.dieseltruckresource.com/dev/showthread.php?t=132796&highlight=ring
• #173 by SMOKEYDUB on 29 Jan, 2007 16:03
• Its great to hear that its working well. accept the coolant thing. God dammit i know how you feel its just so dam frustrating. I have also thought about oringing my engine because for some reason i just cant hold the top end down. I am running arp studs 1.9 gasket and both surfaces are freshly machined and still coolant problems. I AM ONLY RUNNING 27 PSI... i used to runn that in my bone stock 1.6 with factory headgasket..... Im staring to wonder how much boost before grenading this thing. Dr.diesel was running 35 psi and nitrous and his engine held togehter great with nothing done to the thing accept arp headstuds and giles pump... DAM!
  
  i wonder were we could get this procedure performed.let me know if you find a place.
  
  (sorry i got worked up)
  
  Jeff
• #174 by jtanguay on 29 Jan, 2007 16:21
• andy i think its time for you to try a pure copper gasket...  i honestly cannot see a copper gasket failing you!  :twisted:
  
  only one problem... $$$$$$$$$$$$$4
• #175 by SMOKEYDUB on 29 Jan, 2007 16:23
• well how much? i dont car it would cost me less to by one of those then by 7 normal 1.9 ones and all the stress that comes with it.
• #176 by malone on 29 Jan, 2007 17:11
• My 1.6/1.9TD engine had a few coolant tank blow-outs too when exceeding 30 or 35 PSI, albeit with a lower-flowing GT20 turbo. Had Raceware headstuds and a OEM 1.9 headgasket. The car still started & ran like a champ thousands of KMs after that though, it was probably a temporary head lift under full power.
  
  During the engine build Passenger Performance mentioned getting o-rings and I thought it was a great idea, but we couldn't find some small enough for the 1.6 bores so we skipped it.
  
  Next time I would try to get it o-ringed/fire ringed and probably a copper headgasket.
  
  One source for copper headgaskets:
  http://www.headgasket.com/products.html
  About $85.00 USD per gasket.. if they haven't done a TD gasket before then there's a one-time CAD fee $75.00. I'll gladly donate some of my money for their CAD fee and order a gasket. mini groupbuy anyone? Disclaimer: I haven't really researched for other places that make custom copper headgaskets, so there may be better deals elsewhere. I'd like a AAZ-based gasket (for my 1.9 head on a 1.6 block probably with AAZ pistons).
  
  andy2: That really $ucks it has to come apart again, but keep your head up. It isn't an impossible problem and we're all anticipating your results
• #177 by andy2 on 29 Jan, 2007 17:52
• I would say that it looks like 140-145 hp is about the max hp(reliably) that we can get out of these engines before having gasket problems.I'm sure that we can over come this issue and bend rods at 200+WHP :twisted:.
• #178 by jtanguay on 29 Jan, 2007 18:40
• i'll donate money to the copper head gasket 'fund'...  i would expect the copper to hold to around 60 psi easily with good strong head studs.
  
  i trust copper... i learned pretty quickly working on cars that without the copper gasket, high pressure things will leak...  :oops:
• #179 by SMOKEYDUB on 30 Jan, 2007 07:01
• im not sure what kind of power im running its pretty quick but i dont think 145 hp maybe its more i dont know i would love to dyno it. I think i would go for a couple copper gaskets and im sure dr.diesel would buy a few.
  
  Jeff