The new phototype flat 4 for the Next Gen of Subaru

[Guest the_return_of_the_jedi]

the old ej22 n/a and ej20 n/a ( prob most other n/a ) has plastic too oh and the TT intakes are plastic..

prob nothing new..

but yes plastic would be cheaper to mass produce..

still spewin over the plastic end tanks...

[Guest the_return_of_the_jedi]

[aim]

 newsuba']

Why ?

We're not talking tupperware grade.

Because even the polymer of tetraflouroethene probably wouldn't have the same heat stability and strength as many alloys... Just a guess though. I'm curious about the reasoning, I believe it might be a cost thing

Also about the heat soak... Plastic is also a better insulator, so wouldn't that reasoning would only work if the out side temperature was hotter than intake temperature? I guess it wouldn't act as a sink, so would keep the heat further from the intake. I suspect that was your point. :

[quote name='boostcut said:

it doesnt have 90 degree hot water running thru it for the entire life of the car... a bit of boost and 40degree air wont do much... plus if it does crack, get your hot glue gun out lads...

What do you think the plastic is mounted to? Where do you suspect the weak points might be? And a hot glue gun suggests you jest

[Guest the_return_of_the_jedi]

honestly its a weight/cost thing..

[Guest]

 the_return_of_the_jedi said:

honestly its a weight/cost thing..

yea, the taking some weight off how much they cost to make :P

-smurff

[Guest boostcut]

 aim said:

What do you think the plastic is mounted to? Where do you suspect the weak points might be? And a hot glue gun suggests you jest

mounted to the cylinder heads? there will be no weak points unless you plan on removing the manifold with a hammer. some plastics are stronger and more durable than cast alloy. and as for the hot glue gun, obviously taking the piss.

[EJ20T]

they use plastic because its cheap, easy to make complex shapes and requires no or very little machineing, the weight factor has little to do with this. the alloy manifolds dont weigh much anyway. on a side note, evo x still has a alloy manifold, i think its a temperature based thing, same with the sti, rest of the range use plastc

[aim]

 boostcut said:

mounted to the cylinder heads? there will be no weak points unless you plan on removing the manifold with a hammer. some plastics are stronger and more durable than cast alloy. and as for the hot glue gun, obviously taking the piss.

Generally in manufacturing (there are plenty of cases where this isn't true) joins are weak points on structures, this is further emphasised that both materials used will have different thermal expansion coefficients... this is a bad thing where heat is involved, heads can get pretty hot... I have no doubt they've thought about this, just playing a devils advocate really.

I'm primarily curious as to how they overcame the flaws introduced by a plastic. Common sense dictates that an alloy would be the best choice...

Some organic compounds truly are very strong. Pretty incredible one of the most common elements on this earth has such great potential

[Guest boostcut]

have you thourght about cast iron block with alloy heads? they have been doing it for years with no problems.. end of thread.

[Koom]

 boostcut said:

have you thourght about cast iron block with alloy heads? they have been doing it for years with no problems.. end of thread.

I thought the thread should have ended a page ago........

Just put a phenolic gasket in between the head and manifold. Problems solved. Accountants happy.

[newsuba]

Make the entire engine out of plastic.

Problem solved.

;D

[Guest the_return_of_the_jedi]

ha lovin the lego engine..

isnt that what they use in evos? ;D

[Guest]

 the_return_of_the_jedi said:

ha lovin the lego engine..

isnt that what they use in evos? ;D

and there still faster than subarus

-smurff

[Guest the_return_of_the_jedi]

stop swearing

[Guest]

lol, never !

-smurff

[EJ20T]

 the_return_of_the_jedi said:

ha lovin the lego engine..

isnt that what they use in evos? ;D

Must be why ive only replaced 2 evo engines in my time at mitsubishi..................................

[Guest the_return_of_the_jedi]

mitsis are for girls. end of thread

[Guest keltik]

Ok so they switched to a spring tensioned serpentine belt, AVCS, composite intake, drive by wire and what appears to be an external water pump?

Looks like an EZ theyve hacksawed 2 cylinders off. Probably designed by the same team and probably nothing to get excited about unless your worried about making too many carbon dioxides

[Guest the_return_of_the_jedi]

 EJ20T']

[quote name='the_return_of_the_jedi said:

ha lovin the lego engine..

isnt that what they use in evos? ;D

/quote]

Must be why ive only replaced 2 evo engines in my time at mitsubishi..................................

the percentage of evos compared to sti/wrx is so small its not funny.

anyways back on topic

[EJ20T]

 the_return_of_the_jedi']

[quote name='the_return_of_the_jedi said:

ha lovin the lego engine..

isnt that what they use in evos? ;D

/quote]

Must be why ive only replaced 2 evo engines in my time at mitsubishi..................................

the percentage of evos compared to sti/wrx is so small its not funny.

anyways back on topic

yep you just keep telling yourself that, that makes EJ bearing failures just disapair...

[familyman]

 keltik said:

Ok so they switched to a spring tensioned serpentine belt, AVCS, composite intake, drive by wire and what appears to be an external water pump?

Looks like an EZ theyve hacksawed 2 cylinders off. Probably designed by the same team and probably nothing to get excited about unless your worried about making too many carbon dioxides

and the nail just got smacked in the skull.

Most manufacturers these days are very concerned with weight. Lowering the mass of vehicle is easiest way to lower emissions in this tree hugging environmental phase we in.

Less weight to move = less load = less fuel.

Cheaper to make vehicle lighter than actually develop some form of new technology that might help. That why Falcon going FWD in a few years

[Guest boostcut]

i heard ford were cutting either the falcon or the taurus... i dont think they will spend millions developing a fwd car that everyone will hate and make it on par with the taurus... i vote kill the taurus, and bring the falcon out in 4.0l turbo as the base model.... its a schweet car and people who can afford to drive can also afford a smaller more economical car for short trips.

[GC8E2DD]

 familyman said:

Most manufacturers these days are very concerned with weight. Lowering the mass of vehicle is easiest way to lower emissions in this tree hugging environmental phase we in.

Lowering vehicle weight is nothing to scoff at. A lighter vehicle handles better, goes faster, and stops quicker - all qualities in a car an enthusiast prizes. Lowering of emissions, tyre wear and fuel consumption are delightful bonuses.

[aim]

 GC8E2DD said:

Lowering vehicle weight is nothing to scoff at. A lighter vehicle handles better, goes faster, and stops quicker - all qualities in a car an enthusiast prizes. Lowering of emissions, tyre wear and fuel consumption are delightful bonuses.

This man is onto it. a FWD falcon? What's the bloody point? I thought it was called a Mondeo?

[Guest]

A while back AFAIK Subaru stopped making alloy bonnets and body panels for some models and returned to steel.... Why ?

Because the price of alloy had gone up substantially.

Its all about the $$$$

Use to be on an Sti an Alloy bonnet was std - now u only get it on a spec c