Winter hi-po engine project

[bjowett]

Mmmmmmmm, 4.6L

 

[elmariachi]

Mmmmmmmm, 4.6L

Oh man, that is the sh!t. When are you going to start assembly? What did you decide about the crankshaft?

 

[bjowett]

The crankshaft will remain stock, it is in excellent shape and just needs a quick polishing done on the journals. I pick it up Wednesday, then will begin assembly.

 

[MLX450]

Swweeeeet! Keep us updated!

 

[bjowett]

Moving along slowly.... 4.6 shortblock is built. New Toyota main and rod bolts (what a PAIN those were to press out) were used, 2 of the ARP head studs can be seen on the left side of the picture.

 

[cruiserdan]

You do realize that if that head has to come off with those studs you get to pull the motor, no?

 

[bjowett]

The ARP studs have a small 6 point hex inset on the top of the stud, so if required, they can be unscrewed and pulled up through the head to allow removal w/o pulling the whole engine. Smart folks over at ARP... a good product is all in the details.

 

[semlin]

slow down or this will be a fall project

this is the second reference to ARP head studs I've seen today (3FE pwer boost thread). I thought you only used those things if you went with an ultra hipo drag racing style motor. so I'm wondering what the benefits would be in a slightly juiced motor over Mr. T's product?

 

[bjowett]

Studs produce better torque results than a bolt can. Bolts are loaded radially as well as on their axis - the radial twisting loads are bad, they reduce the strength and can eat up some of the torque reading, if I understand it correctly(?).

An engine dosn't need to make big power to enjoy the benefits of head studs. The improved clamping increases reliabilty.

 

[landtank]

so at my next HG PM I should be using these studs everywhere then?

 

[bjowett]

You might not have a "next" PM if these are used....

 

[alia176]

Brian,

What will be the compression be when all said and done? If you're planning on "blowing" it, I'd assume you want that number to be less than 9:1, no?

Ali

 

[bjowett]

I should calculate it out, but my math sucks..... expect it to be around 10.5 - 1... so you you guessed it, no boost for this truck.

 

[alia176]

I should calculate it out, but my math sucks..... expect it to be around 10.5 - 1... so you you guessed it, no boost for this truck.

Ok, no forced induction. What grade of gas do you plan on running with this CR? I assume 92 or higher?

 

[bjowett]

The engine may require a premium grade, 93 is available in Massachusetts, so that won't be a problem. I do plan to experiment with lesser grades, as the effciency of the engine should increase in many ways. The chambers will be polished and all sharp edges removed. An external air to air oil cooler will be keeping lubrication temps in check, and since the pistons are oil cooled, chamber temps will kept down and detonation reduced.

 

[clownmidget]

Brian, can't wait to hear your feedback on how it runs after all this. But after you've driven it around for a while....










put some forced induction on it !


Oh yeah, when are you scheduling appts for others to have such nice things done to their 1fz?

 

[cruiserdan]

Oh yeah, when are you scheduling appts for others to have such nice things done to their 1fz?

At one a year it's gonna be a while.......

 

[Bigshone]

Brian,

Are the ARP studs from a different application, or did ARP custom make them?

 

[bjowett]

These are an ARP stocked piece, though not part of a kit. I'll dig up the number, I do remember they are similar to the stud used on the 2JZ Supra. Most measurements and threads are the same, but the stud is about .5" longer.

 

[cruiserdan]

Since the stock bolts are plastic region how do you determine the proper torque for the nuts?