Tuesday, June 20, 2006 - 07:21 am, by: Carl Johnson(Carlos)
Looking to stimulate discussion round head porting vs cams.
On the phone yesterday with Neil, we got talking about the next steps for my car (& Damiens) I mentioned we were both exploring options for cams. He bitch slapped cams hard & suggested head porting first which I found interesting as there does not seem to be much discussion around this.
Neil is the best source of knowledge in Aus in my view so if he is saying cams won't do much til 8000+rpm I have to take his word.
Comments anyone (especially you Neil!) who's already done it, who's thinking about, who's good at doing the job, costs????? All that sort of thing.
Tuesday, June 20, 2006 - 07:53 am, by: Lew Radbourn(Marlew)
Carl; the heads are good as thay are. the work to be done to them isn't much. it really is only a very small amount to come out a few ridges in there thats all. mine have been done by a guy down here at the coast that does Mopar(chrysler) race engines and he has just about gone cross eyed doing them. bloody pussy !! he is used to doing ports you could put your fist in. but he has done a really nice job of them. the same guy is putting together my V8 SOON i just need to get a few more bits and then it is assembly time. cams are yet to be sorted so i am following what Damien does and will ask the GOD (neil) of all soarers when it gets closer. Neil has so much info in his head that when he does tell you some thing there are so so so many other factors to take into account that the brain starts hurting . I recon he does that on purpose just to confuse the crap out of me.hehehehehehehe well Neil it works!!!! so i have learnt that when you have the funds and every thing is ready to go then and only then ask the questions and do it before you loose track of what was said.
Tuesday, June 20, 2006 - 02:53 pm, by: Damien Smith(Damien)
What Mark said... when I had my intake apart I ran a flexible handle from a magnetic pickup down the lower half of the intake manifold and there's a definite step where it meets the head. I'm not sure about the exhaust side though.
I'm just getting the ports matched and a bit of a tidy-up but nothing major.
Tuesday, June 20, 2006 - 03:55 pm, by: Lew Radbourn(Marlew)
yer there is a lip from inlet manifold to head like you say damien Mine is gone. there are a couple of small ridges inside the head as well witch come out to get that SMOOTH feeling happenin.hhehe the exhaust side doesn't match the manifold (extractors) at all from what i have been told it isn't a good idea to match port the exit side of the head to the manifold just so long as the port its self is not larger then the extractors bolted to it. To restrict it at all. I did ask the question about this and there are two guys that have said the same thing, to why not to match port that side. Neil was one of the guys.
Tuesday, June 20, 2006 - 04:00 pm, by: Damien Smith(Damien)
No worries. If you look at motorcycle headers they step up in diameter after about 20-40mm from the head. Apparently this step up disrupts the exhaust flow which is spiralling out of the head and clinging to the walls so it flows out better.... maybe it's the same principle here.
Steven Nanevski DieHard NSW JZZ30 TD04 Twin Turbo (coming soon!)
Tuesday, June 20, 2006 - 05:44 pm, by: Steven Nanevski(Imprestik)
I know this is out of left field, but isn't there a place in the Gold Coast that builds 1UZ and puts them in MX5 Mazda's. I can't remember the name of them but they (i think) build these up to have either of the 2 settings. 1. A 350rwhp quad throttle body with a 5 speed manual. 2. A 450rwhp blown v8 with a 5 speed behind it.
Now what I remember hearing is they put cams in each of the 2 inhouse designed V8's (specs ???) it mightened be a bad idea to get a opinion with these guys....
Have to see if I can dig up the magazine or DVD...
Moral, they should be able to shed some light into this matter a lot more...
Tuesday, June 20, 2006 - 09:11 pm, by: Phil Gibson(Sciflyer)
Lew its called an anti reversion design, where the diameter of the manifold is larger than the port on the head so that in effect the port surround is restricting some of the exhaust gasses from flowing back into the port when you have a lot of valve overlap
To go further you can actually put a 'lip' around the port that fits inside the manifold pipe to further restrict reverse flow.
Tuesday, June 20, 2006 - 09:34 pm, by: Lew Radbourn(Marlew)
Damien that is about right for the heads a 1jz is $600 odd so the 1UZ would be doubled and a little bit BUT what has been done and are the intakes matched?????
Tuesday, June 20, 2006 - 09:34 pm, by: Damien Smith(Damien)
I've emailed Bullet asking for more info about the cams... prices are similar to others I've looked at and they'd just be getting them from someone like Tighe anyway. At least Bullet know what works with the 1UZ.
Tuesday, June 20, 2006 - 09:44 pm, by: Damien Smith(Damien)
$600 is $100/cylinder so the 1UZ heads should be $800 Although the Bullet ones come with $300-$400 worth of valve springs fitted plus doing 32 x 3-angle valve seats would be time consuming.
A place called NAS Automotive have been recommended to me for basic head porting so I'll call them tomorrow and see what they say.
Neil Griffiths Trader NSW I have MORE Soarers than Hayden :-)
Tuesday, June 20, 2006 - 09:49 pm, by: Neil Griffiths(Aussiesc)
Phil,,The * Lip * you are stating actually uses the harmonics of the exhaust to * pull * the gases. Is very hard to get it absolute..It uses the rebounding procussions.
As for head work. Port Matched Sub-Inlet to Head. Ported Head. ( Power Porting them together is a good idea )
( Here is another question to ask ALL the Cam Places..When they grind the Cam..Do they maintain the edge that Toyota uses to * SPIN * the Valve Shim ? )
( Sorry Daim..I just remembered this one ) hahahah
Above Head WILL support ALL the power you could manage to put into your 1UZ
Carls Power Curve WILL be different to Daim's..Because you are running a 13 inch Intake Length. Daim is running shorter runners so his will come on in a different Rev Bracket. Mine is different again, because I have virtually no runners, and forced air.
The VVT-i V8 Runs Variable Valve Timing WITH Variable Runner Length Like what Ford uses on its Manifold..
Tuesday, June 20, 2006 - 11:18 pm, by: Steven Nanevski(Imprestik)
See how you go with them Damien, I am very keen to see the results, I am very keen to get a project V8 soarer underway in the near future (after my TT is done and also just got a whopping pay increase to help me fund it) But I want to go the N/A with the V8, after all seeing Damiens car at Neils over easter got the cogs turning
Wednesday, June 21, 2006 - 07:05 am, by: Carl Johnson(Carlos)
Adam, cheers have seen that site recently myself I think Damien put me on it it.
The v-eight web site you refer is an interesting read which I hadn't seen....agree brain bending as well. Cheers
Damien thanks for the Bullet site, seen it before but must admit had kinda forgot about it.
Neil Griffiths wrote on Tuesday, June 20, 2006 - 09:49 pm:
Port Matched Sub-Inlet to Head. Ported Head. ( Power Porting them together is a good idea )
Lew would you recommend the guy you are using for above spec? Also good advise on when to ask advise..I have the cash now ;) & I'm ready to do the work.
Wednesday, June 21, 2006 - 07:08 am, by: Carl Johnson(Carlos)
Oh one more thing off this topic. Lew, do you know of anyone down there that can machine 18' rim's? I'm on the Sunshine Coast there is no one up here with a lathe over 17' capacity
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