Dave in his never ending quest to see the 1JZ as a performance powerhouse takes a hard look at the intake valve size and finds out that there is a better alternative to the oversized valve for this platform!
HeadGames and The Motor Oil Geek are my top 2 channels for legitimate information dealing with engines. Its so nice to have professionals in their fields put out tested information. 😎😎
@@headgames i think it is kinda dumb to put oversized valve without actually enlarge the whole hole. But maybe there are some exceptions to this, I don't know.
This is great, I came from watching your podcast and now I found a video on your channel, this is a HeadGames Motorworks session. I love listening to you even if I don't understand you, and reading everything you say, congratulations on your new CNC project. Best regards Goyo
Thanks for taking us on this journey Dave! I had an idea it might be all hype. Just no testing on it. I commend ya on showing all this. You easily couldda said, it’s not good I tested it, but you went way above and beyond. I app that a lot brother!! Awesome job as always. Crazy how far this has come from the old NOPI Nats and Old Englishtown Days!! !! Wild!!!!
Great video and information. Loving these flow test comparisons. It would be interesting to see what kind of flow you could get out of the oversize valve with a port and polish. Maybe that would make a big difference. I know you have a bit of bias against 1JZ heads and 1.5JZ platforms as you mentioned. I get that in terms of trying to make big power and the cost of a 1JZ in the US. I moved to Thailand from the States, and the prices of 1JZs are incredibly cheap and plentiful here. You can buy a Nissan Cefiro or E36 BMW with a 1JZ-GTE swap for around $3000.00 for the entire car. Also, you can pick up the motors cheap enough too. You can get a complete 1JZ GTE for just over $1000.00 here. At that price they make very affordable and reliable power. If the lower end blows up, you can pick up a complete 2JZ-GE for $300.00 - $400.00 here and do a 1.5jz cheaper than you could rebuild or get another 1JZ-GTE. I still like the idea of grabbing a 2JZ-GE VVTi and putting in a set of rods and pistons in that. It would be a better platform for big power and good torque throughout the entire RPM range. Please keep these videos coming. They are very informative and entertaining.
This is one thing ive been unsure about while getting my new motor build. Although its 2.0 tfsi vw motor and aiming for 600+hp ive spoken to a few different workshops about stock size valves and oversize none of them can actually give me a solid answer as to which way to go. Same with porting
the stock valve seat that the valve seals to is smaller than the oversized valve in that head. 600whp would not be enough for porting or bigger valves. It would hurt torque.
32mm doesn't seem that big in an 86mm bore. They do seem rather shrouded though, so 1.6mm larger is quite a jump. I would have expected the SuperTech to gain more anyway though.
Do you have any experience with an M54 head? Wondering if any gains are possible… already forced induction and wondering if I gasket match the exhaust if there’s anything to be had. Love your stuff Dave!!
Will you guys eventually do a video showing the advantages of replacing the 1jz intake seats with 2jz seats and blending the bowls to support the bigger 2jz valve? Or is this "bigger valve bad" going to be the end of the 1jz content?
4 valve heads have critical throat to valve diameter ratios depending on application 2:23 issues could be shrouding in the chamber or bore wall. It's never just "Install bigger valves". There's port lead in, short side, guide, long side, and chamber blending that must occur to fully utilize a bigger valve. The bigger valve equals more power mentality goes back to people who didn't have a clue back in the 80s.
you are absolutely right! That is what we see daily, and why we did our test in that manner. I honestly haven't seen anyone who does it with the correct throat or try to even figure out what the correct throat diameter is. Which is not a one-size-fits-all at all. We also needed to not help either set up, because I do believe that correcting the throat with the stock size valve would put an even bigger hurting on the oversized valve even if we did the same with it. Glad you are on board buddy!
@headgames I just had to redo a set of brodix 18X that had been totally murdered by a "pro", they removed the guide vane and laid back the short side like crazy resulting in a port with no mixture motion on a wet flow check, and a noisy port at .650 lift losing it over the short side and killing flow by 20+ cfm from stock. Fixed the butchery at the guide as best as possible and made the short side right for the application. Numbers came in a smidgen better than CNC'd ones from bodix, and we got our mixture motion back. Below .600, the port was better but still subpar. They just killed the velocity at low lifts by over enlargement of the dead port areas. The customer didn't want to epoxy them, so it the best it can be given the circumstances.
Love your work. Question. I'm doing a Mercedes turbo 190e build using the M103 engine. sohc, inline 6 cylinder. Would you consider porting a head if I send one out?
Have you used the ferrea hollow valves in a build yet? I believe they 20% lighter than std valves but also cheaper than titanium valves. If so would you recommend them?
@@shaunmccreedy6121 I wouldn’t use Titanium or a hollow stem for a 1jz or 2jz. The hollow stem is just scary on anything that makes jam with a 6mm stem to me, afraid of it breaking. And a titanium valve is just not worth the added expense.
This is probably a dumb question but I've been thinking of fitting a 2jzge vvti intake cam in a 1jzge vvti head. Is it possible? I'm running n/a so I want to play around and see what I can do just for some gains before I purchase a 2jzge bottom end. Is it possible? What all must be done? Is it worth it?
Hi can you explain to as to why this is? I’m kinda new to engine mods scene. Doesn’t the valve seat is also replaced to a bigger size to accommodate the bigger valve thus making it flow more air?
@@350gtboi mostly because it was never done and to actually test the results, sodium filled valves sounds better on paper but how well do they compare in actual test
@@vladkruglov7719those valves are great for oem level. When pushing limits those valves get removed. Also the Nissan also uses thicker heavier 7mm stems. Toyota uses 6mm. Honda uses 5.5mm. Going a thicker valves is going to reduce flow. Hence why the super tech valve in this video improved flow. As it was profiled. So I still see no benefit.