How strong are the 1mz internals?

[tucky]

I'm thinking of getting my heads port and polished. The car is running a trd supercharger @ 4 psi , water injection, walbro fuel pump, custom headers/exhaust, de-cat, custom induction kit, fse boost valve. It's running @ 272 bhp and 278 ft/lbs of torque. In theory the head work will take me over or as close to the 300bhp mark. Can my 1mz engine handle this as I'm going to be running it with a hydra stand alone, fully mapped. What are the limits of the 1mz?
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[PDX SuperSolara]

The weakest part of the 1mz is the pistons, the ring lands are always the first thing to go. Properly built and tuned however prevents problems. I would lower compression to 9.2 which allows more boost. I am running 8 psi with a proper fuel delivery system with rising fuel pressure to compensate for boost. Through an automatic I am running 275 hp at the front tires which equates to around 330 at the crank. The rods and crank are pretty strong, but the next weak link I would guess is the block. It is aluminum with liners which doesn't like too much abuse.

[tucky]

Thanks for that, I think if I'm going to uprate the pistons i might as well uprate the con-rods. I've never heard of the block being a weak link though.

[DatSRBoi]

Thanks for that, I think if I'm going to uprate the pistons i might as well uprate the con-rods. I've never heard of the block being a weak link though.

Our blocks arnt as almighty as people think it is. Ive heard plenty of block gone wrong on this forums already. I can imagine the stories outside this forum.

[Fletch]

Where did you come from? Cool setup. I would say, yes, the stock block and internals can handle those levels of power/torque. Historically, folks on this site have broken piston lands by running elevated levels boost without supporting fuel/tuning.

[tucky]

So if I set the car up with stronger internals(stage 1) and run her @ 4psi. Then have a hydra installed and run her @ 6psi I should be safe with that?

Something else to consider is. If I were to source a 3vz the internals are stronger and I could run the trd @ 6psi without the need to uprate the internals. It would be alot cheaper than replacing the pistons and con-rods.

[Eye8Pussies]

I always thought that it would take ALOT of work to get the blower onto a 3vz....BUT apparently it is quite possible if you have the resources and are willing to do some hacking

I just found out about this as well, but some guy on the mr2 forums is doing it right now apparently


you'll need a new engine mount (not sure which one), custom headers (not sure why), as well as you have to hack the strut mount for belt clearance...

so not sure if that's really worth it at all....



that, and plenty of people on this board have safely run 6psi with good tuning and no problems so far

[**PoshPepper**]

BUT apparently it is quite possible if you have the resources and are willing to do some hacking

I think this is true for pretty much everything...

[tucky]

The weakest part of the 1mz is the pistons, the ring lands are always the first thing to go. Properly built and tuned however prevents problems. I would lower compression to 9.2 which allows more boost. I am running 8 psi with a proper fuel delivery system with rising fuel pressure to compensate for boost. Through an automatic I am running 275 hp at the front tires which equates to around 330 at the crank. The rods and crank are pretty strong, but the next weak link I would guess is the block. It is aluminum with liners which doesn't like too much abuse.

Hi mate, what kind of fuel delivery system are you running?

[woa_its_j3ff]

with all this said, can the car still be safe for making a few high speed runs, even if stock?

[PDX SuperSolara]

The SuperSolara has a return style fuel system. I use a Bosch external fuel pump, a Golan filter, a Aeromotive fuel pressure regulator with a connection to the boost port which increases fuel pressure with boost. I run STOCK injectors. Fuel pressure is set at 48 psi but increases to 56 at full boost. Naturally, the fuel lines between the regulator and the fuel rails are the same set-up as comes in "Jim's fuel kit".

[Akfahad]

^^Damn...you the man Jim

[Eye8Pussies]

The SuperSolara has a return style fuel system. I use a Bosch external fuel pump, a Golan filter, a Aeromotive fuel pressure regulator with a connection to the boost port which increases fuel pressure with boost. I run STOCK injectors. Fuel pressure is set at 48 psi but increases to 56 at full boost. Naturally, the fuel lines between the regulator and the fuel rails are the same set-up as comes in "Jim's fuel kit".

hmmm....I didn't know that you could do that....

I have the aeromotive fpr as well (the gen3 camry is return fuel), but have the vacuum hose hooked up to my stock fuel rail where the stock fpr had its vacuum hooked up to.

can I hook that up to just any vacuum port on the blower?

[tucky]

Sorry to bring this up again, I seem to have the fueling side of things sorted. I'm now looking at a 6 psi pulley so I'm not too worried about the pistons and ringlands. Will the con-rods bo ok for 300 bhp?

[ASG14]

^ Right now Eye8Pussies is running 7PSI putting down around 270whp, on a stock engine (internally) with 200k miles. And let me tell you, that car gets used like it;s racing, lol.