4-barrel intake
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I think your about to open a huge can of worms, it seems that no Z person n there right mind would ever even consider using a 4bbl. on there Z car. You have to be crazy to even think it,its amazing to me that so many different companys make a 4bbl. when it just dos'nt perform worth a sh!t. SUs r the only way to go,the super tuned 1s are just that much better,yea right.I hope you dont listen 2 the post that r about to come your way, if u want to try it please do, I did and I love it. some people R just stuck N tunnel vision and dont want to try any thing else,be a leader not a follower and check this out,www.zhome.com/~aktar/wayne/ Yea check that out and let me know what u think.
I have seen a lot of negative posts about the 4-barrel conversion. I personally don't believe that the 4-barrel would be worse than the SUs. I know some one who has the 4-barrel on their 240Z and it runs just fine if you ask me. The car was autocrossed regularly with nitrous too. The nitrous conversion is probably much easier with the 4-barrel as well. If anyone says that the 4-barrel manifold does'nt evenly distribute the fuel "I don't believe it". I think the only carb setup that has equal intake runners in the tripple side-draft sets. If any thing the 4-barrel should provide more low end torque because of the longer intake runners. The longer intake runners allow the fuel more time to mix with the air on a cabureted engine.
Anyway, go for it. Just don't try to put a 600CFM carb on there and expect it to run. Ask them what carb they recomend. You want one with lots of adjustability. I am certain you will not need a carb any larger than 330-390CFM. I am sure ArizonaZcar can tell you how to make it work well with your setup.
Anyway, go for it. Just don't try to put a 600CFM carb on there and expect it to run. Ask them what carb they recomend. You want one with lots of adjustability. I am certain you will not need a carb any larger than 330-390CFM. I am sure ArizonaZcar can tell you how to make it work well with your setup.
This debate is getting old fast. The 4bbl will work just fine and the recommended carb is a 4bbl 390 which are getting hard to find unless you go buy a race carb. A 600 will work fine it just has to be jetted and worked a little. I like the edelbrock carbs over the base holleys.
The fuel distribution issue is real, believe it, I mean really this is not the hard part to determine. What most people don't realize is how many different 4bbl manifolds are out there. Some are much better than others, the one piece long runner types are the worst for fuel distribution - they actually really suck. I know of at least 4 different types and have 2 sitting in a box.
Tony D has done lots of research, and not in a seat of the pants fashion, I'm talking about measurable repeatable test that produce real numbers. I haven't always agreed with everything he says, but when it comes to building cars and racing them I can't hold a candle to his experience and I value that and am thankful that he is willing to share his results with us even after he gets flamed and basically called a liar.
You also have to realize that his research has been to get that last little bit of power out of a race motor - so the room for error is alot smaller than would be on a street engine that may rev to 6500 rpm. For the normal driver, the 4bbl setup will work fine, better than SU's - I dunno I think it's all relative to what better means to you.
Give it a shot
Matt
The fuel distribution issue is real, believe it, I mean really this is not the hard part to determine. What most people don't realize is how many different 4bbl manifolds are out there. Some are much better than others, the one piece long runner types are the worst for fuel distribution - they actually really suck. I know of at least 4 different types and have 2 sitting in a box.
Tony D has done lots of research, and not in a seat of the pants fashion, I'm talking about measurable repeatable test that produce real numbers. I haven't always agreed with everything he says, but when it comes to building cars and racing them I can't hold a candle to his experience and I value that and am thankful that he is willing to share his results with us even after he gets flamed and basically called a liar.
You also have to realize that his research has been to get that last little bit of power out of a race motor - so the room for error is alot smaller than would be on a street engine that may rev to 6500 rpm. For the normal driver, the 4bbl setup will work fine, better than SU's - I dunno I think it's all relative to what better means to you.
Give it a shot
Matt
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3,311 Posts
U wanna know why?
Because most people who switch to the 4bbl either.
A. Want a cheap alternative to fixing their broken EFI
B. Think "Whoa! A 4bbl!" (AKA thinking the L6 is just like a v8)
C. Have no idea how to tune their SUs
What catagory are you Flame?
Because most people who switch to the 4bbl either.
A. Want a cheap alternative to fixing their broken EFI
B. Think "Whoa! A 4bbl!" (AKA thinking the L6 is just like a v8)
C. Have no idea how to tune their SUs
What catagory are you Flame?
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