1FZ REBUILD, Doing it right the 1st time

[Cruiserhead05]

So at just under 245k miles i know my engine may be in need of a rebuild sometime within the near future, the HG was done at 200k. im totally fine with that and im expecting it. I love the 80 and have no good reason to ever sell so when the time comes to rebuild it, i think i want to look at doing a S/C as turbos are no longer offered. are there any other suggestions for rebuilding it, possibly boring the engine a little larger. Its just that once i get into the engine that far i want to do all i can to make it nice. i figure with a totaly rebuild the s/c might be a decent idea, i just replaced the radiator so cooling shouldnt be an issue.

Just wanted to here what everyone had to say.
Thanks, Brandon

 

[semlin]

do some searches. this has been covered more than a few times. funny thing is many people muse about a rebuild but nobody seems to ever actually need one. Bjowett was talking about it for a while a few months back and had lots of good ideas but i never heard the outcome. I know Robbie has done one

you do have the option of fully boring the block out and doing some head porting to get to 4.7 litres for lots of conventional power or a more modest bore coupled with the new turbos i keep hearing about. you can also just buy yourself a used turbo diesel.

 

[Josh83]

How much power does a 4.7 1fz make? And if you are going for that kind of money in your engine, do a custom turbo. You could probobly do it for the cost of an SC.

 

[elmariachi]

Its just that once i get into the engine that far i want to do all i can to make it nice. i figure with a totaly rebuild the s/c might be a decent idea, i just replaced the radiator so cooling shouldnt be an issue.
Thanks, Brandon

1. Find a reputable, well-equipped machine shop to help you analyze your disassembled engine and determine what should be done. Proper consideration of decking, line-boring etc. by experienced engine builders can result in a really awesome engine that will do wonders, NA or SC'd.
2. Make the decision up front about whether or not you are going to SC it and build with that in mind. How you build it out with respect to final compression with the SC could affect how it runs on pump gas.

Just my .02c worth.

 

[lx450landcruiser]

when i have to rebuild my engine i think i would rather drop a v8 in. just seems like the right things to do. more power, more torq, prob about same cost. however has any one done a v8 swap with the later model 80s? iv heard they only do the 91s and such. does marks even make a it for the new cruisers?

thanks
mike

 

[Cruiserhead05]

lx450,

Are you just talking about a small block 350? in that case i dont know if i would go that route. I wont to stay true to the I-6, for some reason when i see chevy engines in the 80's i just dont like it. maybe in a 40 or a 60.....thats just me. Well as semlin said, who knows when/if this will happen. My engine is still very strong and not burning oil bad at all. It really shows no signs of pooping out anytime soon. I just figure if i get an early start researching this i will know exactly what to do when the time comes. Does anyone recommend anybody for doing such a job? preferrably on the east coast...

Truthfully, i am hoping when the time comes to rebuild my engine someone will have another turbo kit available as that would be awesome. Speaking of that, any word on MAF's turbo they were suppposed to have soon?

 

[MoJ]

when i have to rebuild my engine i think i would rather drop a v8 in. just seems like the right things to do. more power, more torq, prob about same cost. however has any one done a v8 swap with the later model 80s? iv heard they only do the 91s and such. does marks even make a it for the new cruisers?

thanks
mike

I could possibly bring myself to do that if it was a Toyota V-8 but wouldn't ruin a Cruiser with a Cheby motor. I've passed on a few 40's lately simply because of a non-Toyota transplant. My .02

 

[bjowett]

I have my builder torn down to a long block... I'll get going on it soon. Forced induction has been part of many projects in the past... but I've decided to go all motor for this project. Robbie mentioned his built 1FZ engines being close (but not quite!) to a TRD supercharger.... and that is with stock cams... man, if we could get a run on a nice mild grind hi-po cam set, wheweeeey!

 

[elmariachi]

Robbie mentioned his built 1FZ engines being close (but not quite!) to a TRD supercharger.... and that is with stock cams... man, if we could get a run on a nice mild grind hi-po cam set, wheweeeey!

No kidding. The right cams could make a ton of difference. Wonder what's in Japan that we haven't seen....

 

[mabrodis]

No kidding. The right cams could make a ton of difference. Wonder what's in Japan that we haven't seen....

Isn't that a lead-in for Mot?

I've too wondered about cams, for pretty much every other engine, even Toyota engines you can get a performance grind, RV, etc, atleast have some options. Cool part is the cams are something you could change without rebuilding or pulling the engine.

 

[robbie]

Cams would be cool and if not done right can be a nightmare. They would need to work with the efi computer and may not be that good for the early years. Darren Mac in OZ maybe able to help us out in this area. They have done some wild stuff over there with the 1FZ. I finally did the math and my engines are only 4.6 liters( i honestly do not know how I got 4.7 liters, but did some how. SO i will change my stuff at the bottom soon. So that said here at 5000 ft my truck set up the same as a super charged truck is only about 3-4 mph different on a hill behind the shop. My other engine I have out of the truck is about to be pulled apart and I am going to find some on to give me some stroke on it (more than .020 in) which would mean welding the crank up to get some more cubes. The have stroked the 1FZ to well over 5.5 liter in OZ and one was stroked to 6 liters(still want a v-8?, I do not). Any how back to cams, It would be nice to talk to some one that works with them and EFI, because if you cam it too much it will be out of certain values that will trip the computer off and not allow the engine to run properly. To do a swap entials more money then you think and much more time than you think. Christo is starting the toyota 4.7 swap in to a 91-92 soon and will post some stuff after that.
But the best bang for the buck is still forced induction on a engine set up for it(different thoughts will give different results). I am lucky in that I have a couple of engines to play with when the money is avaliable to play with. Any time you pay full price it gets expensive real fast. later robbie

 

[ultimauk]

I have my builder torn down to a long block... I'll get going on it soon. Forced induction has been part of many projects in the past... but I've decided to go all motor for this project. Robbie mentioned his built 1FZ engines being close (but not quite!) to a TRD supercharger.... and that is with stock cams... man, if we could get a run on a nice mild grind hi-po cam set, wheweeeey!

"if we could get a run on a nice mild grind hi-po cam set, wheweeeey!"

www.crower.com

It's a regrind thou.

 

[lx450landcruiser]

I dunno its hard to say i also love the I-6 however i dont see any probelm running something like a ram jet 350 or something of that nature. I put a v8 in my 40 and love it dont see why it wouldnt make the 80 any more fun?

 

[KliersLC]

The selling point for me on the 1fz-fe is the torque curve. HP is fun and all, but what gets you where you need to go in one piece without tearing up the trails is the low torque on the I6. Yes the v8 would be cool on the street, but when has the I6 ever needed more power on the trail? In addition the cost of the v8 swap is ridiculous unless you already own a shop, have the parts, and replacement engine, and do all the work yourself. There is also something to be said about toyota reliability here, and the I6 has less moving parts than the 4.7.
my two cents
Dan

 

[Cruiserhead05]

Well, i may talk to Lance at ironpig and see what he thinks of it all. I think he is qualified to do the job.
I think i would just go with a basic rebuild and a s/c
or.. a basic rebuild with a turbo. diesel if its an option and i can afford it. but its doubtful.

As far as price, i figure the rebuild will be 4k, a supercharger another 4k...by the time its all said and done this might get pricey...10k maybe but still for 10k what can i get to replace a fully locked 80? not much.

 

[elmariachi]

As far as price, i figure the rebuild will be 4k, a supercharger another 4k...by the time its all said and done this might get pricey...10k maybe but still for 10k what can i get to replace a fully locked 80? not much.

You can find blowers cheaper than that.

 

[Cruiserhead05]

Jim,

Your probably right but i just noticed 3600 on slee's site so i was allowing a little extra for a buffer. All total i dont think it would really be 10k but even if it was, it would be worth it......

 

[FJ40Jim]

There are two important factors that determine the performance potential of an engine.
First (obviously) is displacement.
Second is the total amount of unshrouded valve area.
A 24 valve DOHC engine has considerably more breathing ability (and reduced pumping losses) than a similar sized 16V pushrod engine.

The 1FZ as delivered in the US is cammed, compressed and computed to run on crap gas, while producing listerine fresh exhaust gas. A ramjet is cammed, compressed and computed to run.

There wouldn't seem to be much difference between a slightly worked 4.6L 1FZ and a 5.sumthin litre pushrod V8 engine.

I dunno its hard to say i also love the I-6 however i dont see any probelm running something like a ram jet 350 or something of that nature. I put a v8 in my 40 and love it dont see why it wouldnt make the 80 any more fun?