2JZ head porting.

[TK]

Haven't looked closely at a BA head, but ford have their shit together on port design - miles ahead of most of the jap stuff - so there probably isn't as much to gain by porting them.
Having said that he must've done something badly wrong to have to go back to a standard head.
If he tried a traditional V8 style port job on it it would've gone backwards, multi-valve stuff needs a completely different approach (yes, I killed a head before I figured it out, luckily it was a scrap head I was using for development).

TK

[Billzilla]

Update :
A local guy has come forward with just about the perfect car for this, thanks to Supercrown for pointing him in my direction.
Level of mods is spot on, car has a good development history & dyno sheets of it's current output, better yet currently the manifolds are off so it isn't that much more work to remove the head.
Plus he's a local, so freighting the head is not a problem.
Head is coming off over the weekend & all going well will arrive here monday night.
He'll be along here in the not to distant future to post current specs on the car & a dyno sheet.

Let the fun begin!

TK

Awesome!
Can't wait to see the results.
Bet there's well over 100hp in it.

[2JZR31]

Good to hear TK. I don't think my car would have been the best to show what you can do and a stock head is good enough for what I want anyway.

Troy, that manifold doesn't look to good to me mate. Take a look at the angle of the port on at far right. There would be a massive angle in the flow path considering it points outwards and the port faces inwards. RZ is right about the port angles. The 2 out side runners must face inward and the 2 centre runners must face outward if there is to be a smooth flow integration between the ports and the runners. The one you pictured would have sharp angles in the flow paths.

[BigMuz]

, stock heads seem to be completely unsuitable for boost - I don't know what toyota was thinking,

Yeah who knows? They're a simple engine that outperforms EVERY other engine of the same capacity.


:D But seriously, I think that's what I like about these engines- you'd be hard pressed to tell any differences from a 202 internally, but they work and are bulletproof.

Even with the heads being badly arranged and badly ported they still make 300 hp for 200,000 kays while being smooth as a whistle. It's kinda the ultimate function over form engine. it does it all without huge rods, forgeed crank, elaborate head, fancy valve timing gear etc etc. it's a 2 bolt main, cast crank, cast rod cast (iirc) piston 6 cylinder with a production style head that makes a hundred horses per litre stock and can make 3 times this on stock internals.

As Julius Sumner Miller once asked; Why is it so?

[Billzilla]

at what power level?

At idle ya spanner!

[2JZR31]

stock heads seem to be completely unsuitable for boost - I don't know what toyota was thinking

I think plenty of us have proven they aren't that bad. Stock 2JZ + ebay = 600hp with a stock head.

[21OWA]

Dennis, not sure if thats the actual gen 2 full race manifold or not, its just the pic they have on the site for it

but every1 in the states rave about these manifolds, they say theres nothing better than them but they come at a price!
Geoff from full race also says that he thinks there manifold is the best by far

but if you own the company, who wouldnt say that about there own product lol

not sure how we will do my manifold, might look into the port directin and do it that way, see what happens

[2JZR31]

Put it this way if that mani is that good. It would be better even better if the runners faced in the same direction as the ports. I would rather a 6boost manifold that that one. Even if the runners come out straight it would be better than facing the opposite direction of the ports.

[RX22NV]

I only have NA - 2JZ-GE's. One is stripped down if you wanted to compare the flow of the NA versus the Turbo head. I've read in a few places that the NA head outperforms the turbo one. But that won't matter to most here as they are not interchangable.

[2JZR31]

They are if you are starting a fresh 2JZ build and haven't purchased manifolds etc yet. I think it would be pretty good to at least see a stock flow comparo, and hear TK's thoughts on which one is better.

[TK]

Might be difficult to buy turbo manifolds for NA heads? - if so then there's really no point.
One outperformning the other in stock form is not a good indication of their potential when ported.
I can think of several instances where the inferior in stock form head is capable of more/cleaner flow than the factory 'gun' head for a particular engine when ported.
So, to do a fair comparison, I'd have to test both heads stock, then do a similar amount of port work on both & test them again to compare the differences, unfortunately I can't spare the amount of time that'd take - may be worth looking at at a later date.

One of the points of this exercise is to show what can be done using the stock head & valves with a port job that is not so over the top that the cost is prohibative.

stock heads seem to be completely unsuitable for boost - I don't know what toyota was thinking

I better rephrase that a little before all you 2J guys get your knickers in a twist - for a stock 300hp turbo engine the ex ports are quite adequite, the intakes are overkill, but for a 5-6-7-800hp turbo engine the intakes are adequite & the exhausts are shithouse.

TK

[2JZR31]

You can even get ebay turbo manifolds for a 2JZ GE

[ALLMTR]

Yeah but can't seem to find the "good" ebay manifold for the gte

[Andrew Bolt]

There was a split pulse one for sale on US ebay for 139 US. Postage would be the killer....

[2JZR31]

You gotta buy ebay stuff when it comes up. I got lucky. If you get the other mani I bet the "good" one comes up the week after.