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Engine Specific Info and Questions => IDI Engine => Topic started by: rallydiesel on September 05, 2008, 06:12:03 pm

Title: Would copper HG help with higher boost?
Post by: rallydiesel on September 05, 2008, 06:12:03 pm

I've just been day-dreaming about the ultimate IDI. Would a copper HG help run higher boost (50+ psi)? Or would you just have to go with an iron head to keep that boost contained? Do the big three trucks have iron cylinder heads from the factory? It would be so nice to run a custom compound set-up but is this just a pipe dream? I now there has been a lot of talk here about running a copper HG but has anyone actually done it? Maybe a copper head gasket on the thick side to lower compression, a huge intercooler and oversize head studs would make it somewhat doable?

School me.  :?

Title: Would copper HG help with higher boost?
Post by: andy2 on September 05, 2008, 06:23:45 pm

I've had compound turbos 50+ psi boost,14mm head studs,copper headgasket with o-ringed block and reciever groove in the head,cryo treated head.This custom setup worked no better than the stock gasket/bolts.All the detials are in the "Compound pics" topic.

An Iron head is the solution for compound turbo setups.Cummins use an Iron head Duramax uses aluminum and powerstroke uses iron.

Title: Would copper HG help with higher boost?
Post by: gigaz2 on September 05, 2008, 06:39:16 pm

Ford Endura engines (1.8D/TD) have iron heads if I recall correctly, but I don't remember anybody modding these as we do to our VWs.

Title: Would copper HG help with higher boost?
Post by: rallydiesel on September 05, 2008, 07:46:03 pm

Is this a problem with TDI's as well? I can't recall seeing many set-ups boosting much more than 30 psi.

Title: Would copper HG help with higher boost?
Post by: burnt_servo on September 05, 2008, 09:10:19 pm

anyone thought about doing this ,

dropping the compresion to around  15 to 1 , this would allow eveything to survive at the high boost pressures without self destructing .

the draw back would be cold temp starting and operation .

this would partially be fixed by installing a grid heater out of a cummins into the intake of the vw to heat the air going in , as well as using the glow plugs .

then maybe also using a lightly hotter thermostat in the winter time to keep the engine a bit warmer .

the lower compression ratio would also help with keeping the injectors from double poping  with high combustion pressures  .


btw the ford head ,  does it have the same bore spacing as the vw engine ?

Title: Would copper HG help with higher boost?
Post by: MJF on September 05, 2008, 11:50:19 pm

Why do you want to run so huge boost? I had ~230hp@30psi without smoke.

Title: Would copper HG help with higher boost?
Post by: andy2 on September 06, 2008, 10:55:34 am

TDI's seem to have the same problem only they will make more power before the same problem occurs.

With my 12mm pump cranked up It takes my compound setup approx 45 psi to have no smoke and sustainable EGT's.

When my engine was operating I can assure you that it was making 250+
 hp anyways.I had the same engine making 190 hp @ 30 psi 3 years ago with no cyl head issues that was using much less fuel and smaller turbos.

Title: Would copper HG help with higher boost?
Post by: gigaz2 on September 06, 2008, 11:42:58 am

Quote from: "burnt_servo"

btw the ford head ,  does it have the same bore spacing as the vw engine ?

I know I'm running Ford injectors, but that would be plain sick :D

I'll investigate ;)

Title: Would copper HG help with higher boost?
Post by: 53 willys on September 06, 2008, 11:59:27 am

compound turbos=lots more boost then a big single turbo.

Title: Would copper HG help with higher boost?
Post by: rallydiesel on September 06, 2008, 01:19:35 pm

Quote from: "53 willys"

compound turbos=lots more boost then a big single turbo.

Thanks for the news flash.  :wink: