Oversized intake valve in a 1JZ?!
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- čas přidán 7. 09. 2024
- 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. 😎😎
Appreciate you !
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 sugar!
i like how he tells you to spend less sometimes
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!!!!
I am just over here learning, but with an audience.
Definitely crazy how far we have come since those days!
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.
I would probably be more into them if I lived in Thailand for those reasons too.
I wonder why would anyone put oversized valve without actually doing full porting job to optimize it.
To upsell you
because besides the Supertech offering, there is nothing else available.
@@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.
@@madunwerkstatt3093 agreed. Which is why we put this out there.
This is great info, next up is to compare this data to a pocket port or full port and supertech valve
Agreed!
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?
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!!
@@evanormous6409 I can’t think of any cylinder head that really gains at the gasket end. The gains are in the valve job and bowl area.
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.
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?
Thanks for the kind words! Unfortunately, we wouldn’t port that head. It’s not one we work on.
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.
i really appreciate the metric measurements. Why do the ports curve?
Towards the manifold direction or where they mount the turbo is best way to say that
Then maybe try a smaller head valve and flow test that ,
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.
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.
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?
What about an oversized super tech valve?
Ok so I'm building a lampredi twin cam right now, planning on big valves, head porting, and high lift/short duration cams for rally cross. Good plan?
I am not familiar with that head at all, sorry. No opinions.
I have a 1JZ GE VVTi head you can do what ever to if interested
we have one here. Thanks for the offer!
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?
the valve will fit on the OEM seat. And the OEM size Supertech flowed the best.
@@headgames oh so that’s why, because it’s still using the the oem seat, thanks for the reply
I know abit about back cut, what about cut like 60 or 45 towards the combustion side of valve head to make it go around valve? Does it help?
I wasn't trying to help any of the combo's just see what they do alone.
@@headgames but in general does such valve back angle adding aid in performance or has drawbacks? Rigidity? Or backflow?
@@gedas3419 depends on the valve, and the valve job. It’s not always a gain. Sometimes it’s a loss.
Just to confirm. The over sized valve was used with the throat factory sized?
Yes
So the restriction is not in the valve?
Correct!
Do GSC valves have as well this undercut?
GSC doesn't sell a valve for the 1JZ
@@headgames yes, that was clear in your video, but do they sell for 4g63?
Big question, can you fit rb valves on jz?
yes you can but why would you. they probably wont fit directly.
Big question is why?!
@@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.
no, they do not
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⭐️⭐️⭐️⭐️⭐️.
🙇🏾♂️
What did it flow with no valve in the head?
all of it!