jerry didn't do my head....... Alex Cowie did, as far a i know it is a superflow, regarding the reducers i really wouldn't have a clue if he used them or not...& lifting the port floor did not a thing for my head when it was done ... at the start it did but once he was done it didn't help at all

ok 207 209 seems to be the best port if we use the reducer we get a higher flow figure so were just stick with the 88mm pipe for better reading still gona have abit more play time just to see wat happens

good work dude

Quote: Originally Posted by NZ VLCT good work dude thanks just gona try see how far it will go and then the excaust has to be done more fun.

Alex has been porting heads for 10 years, thats all he has done, porting and head reco stuff in that time, and from what I understand is very very good at it(not any reflection on your brothers skill), we gave him a test head, and said hog the roof out and fill the floor of the port as much as he could, he went right through into the water(as we were just experimenting) and raised the floor to match, and didn't pick up 1 single cfm. The are we made the most gains was on teh back angle from the valve seat to the short turn. The angle on the 3 angled seats is critical, as its the transition from the bottom angle to the short turn is where all the airflow is to be picked up in the port. Also widening the port around teh short turn rather than making it higher slows the air speed down as it turns the corner/short turn and allows higher flow with better swirl/less turbulence. Unless you filled the port floor right around the short turn to the valve, there is little to be gained, as its right on the short turn that is the restriction. Its also almost impossible to do this, as the bog/zspar/fiber filler is so thin, its hard to retain to the port floor, and also this far in is being hit directly with fuel spray from the injector, which will prob effect most fillers over short time, definately fiber filler will go yuck, and Z spar would have to be glued down, the fuel would quickly detach most glues/epoxy. Not to say it is IMPOSSIBLE, more that the gains anywhere but right on the short turn are negligable, and the amount of effort that would be required to completely redesign this area is in my opinion simply a waste of time. Rajab have run 8.4's without filled ports, and in reality 1-2psi more boost would give prob the same increase in power anyway....... Then there's camshaft testing and design, compression ratio, turbo back pressure...... An interesting thing to note, try bolting the intake manifold on. You'll prob find that although you've gained 20cfm through the port, with the restriction of the intake in front of it again, the difference between a head flowing 190 and 210 will prob only be about 3-5cfm through the manifold. 6BOOST

yep thanx kyle pretty much wat we are doing the bro hasn't bothered with the jap heads before he no's the chev,holden and ford heads well my bro's been in the buisness for over 20yrs and hasnt had that much time at it yet as like u he still has a buisness to run ,and as u no love jobs never take priority but he'll get there

6Boost, how about a run down on the porting of the Ford E Series engine that you are familiar with. In particular explaining the laying back of the short turn radius that you wrote in that article for Autospeed. Like how far back do you lay it back. Any help appreciated

I've never had an article in Autospeed dude. Do you mean Zoom?? The magazine?? Otherwise I've never seen this Autospeed article, give me a link 6BOOST Some original photos have not been recovered yet.

Quote: Originally Posted by 6BOOST we gave him a test head, and said hog the roof out and fill the floor of the port as much as he could, he went right through into the water(as we were just experimenting) and raised the floor to match, and didn't pick up 1 single cfm. downporting has been proven by the pros to work very well, but there is more to it than hogging out the roof of the port and filling the floor, you have to fill right down round the short turn close to the valve seat this is a std practice for downporting this style of head. Quote: Originally Posted by 6BOOST and Z spar would have to be glued down not true, Z spar is the best product on the market and survives well if applied correctly even when it thins right out on the edges, you need to use 40 grit cartridges to key the floor and stud the floor also.

Sorry, I might have the wrong guy. Did you ever go by the name GM DSTROYER on the Ford Forums around 2003/2004. Anyway the article that this "bloke" helped write is on the following link. Whoever he was seemed like a nice bloke and knowledgable. http://www.autospeed.com/cms/A_1792/article.html

Quote: Originally Posted by TroyVK just found out the flow figures of a dead std 2J head and 1J head yes i know its not a SOHC std 2J as follows 238@400lift intake 154@400lift exhaust std 1J 215@400 intake 133@400 exhaust even after the guy ported the 1J head, it still didnt match the std 2j head figures where 230 and 152@400 all tests where done on the same bench i guess that puts the rumour to rest that the 1j head is better than the 2J Being Dennis started what turned out to be a rather amusing thread on SAU about it all and never posted the info back here... Here are the details that came out Rb26 (std) Inlet: 148cfm Ex: 105cfm Rb25 (std) Inlet: 136cfm Ex: 98cfm 2JZ (std) Inlet: 139cfm Ex:121cfm 1JZ (std) Inlet: 134cfm Ex: 115cfm And a link for those inclined to look for the specifics about it all/what was/wasnt done with the test etc etc as i dont understand it Take it as you will, wehter you think its right or not, i dunno Start reading from page 5 http://www.skylinesaustralia.com/for...&hl=*JZ*&st=80 (http://www.skylinesaustralia.com/forums/index.php?showtopic=125207&hl=*JZ*&st=80) Otherwise you'll just see DennisRB30 arguing that JZ's are better than RB's better because cars run 10-sec 1/4 mile passes on stock bottom ends... not sure what that had to do with flow figures of heads though Some original photos have not been recovered yet.

finaly got my new custom stainless valves ,so l can finish playing ,1st excaust port got 162 @28 500lift, its been slow but it takes time been doing a bit of port work for the bro to pay for extra parts.

so how come the lifts on sau where alot diferent that your rb30 1ns where they done at less lift or diferent inches of water or whatever it is what would they flow at 28 inches does a ported rb25det head sound rite at 260 cfm @450 at 28 inches

Turbotory, no that is a guy that i solt a lot of patrts off my car to and pointed in the right direction with what to do with the setup. Quote: Originally Posted by NZ VLCT downporting has been proven by the pros to work very well, but there is more to it than hogging out the roof of the port and filling the floor, you have to fill right down round the short turn close to the valve seat this is a std practice for downporting this style of head. not true, Z spar is the best product on the market and survives well if applied correctly even when it thins right out on the edges, you need to use 40 grit cartridges to key the floor and stud the floor also. I understand there is more to it than just hogging out the roof, Alex Cowie is one of the best around here, he definately knows what he is doing, and said that while you can attach it to the floor with screws and such further back, and yes, it will stick even when very thin, he wouldn't run it that thin on a street engine and that in his experience they don't last for long sevice periods in a regularly driven road car when run down that far. But feel free to try it, like I said, theer weren't any gains to be had. 6BOOST

well there wont be any real gains if he just did the port floor and not into the short turn. A lot of guys have been put off head bogging because all the previous product all failed with time, its a shame that the head warps so easy with welding, because it would be nice to do a real downport job on one. what valves are you using pigsy?

l got a set of stainless custom from lvan thye up here in qld ,the face of the valve and such is diff to ferra valve also done another excaust port got 165.5 l think thats as good as its gona get

good thread guys and great read. well done

Bumping this up. Makes for a good read how are peoples heads flowing now? Some original photos have not been recovered yet.

where could u buy 3mm oversized exhaust valves rb30

I reckon i have some here..pm me