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Question for the Performance Mechanics

  1. #1
    Senior Member customtouch's Avatar
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    Default Question for the BBC Performance Mechanics

    I saw this intake for sale and this doesn't make sense to me. It is suppose to be for a square port BBC but I don't understand the varience in the port size. If you look close, you can see from the gasket marks how it fits the ports of the heads. How could this intake possibly work well with half of your cylinders getting 1/4 less fuel than the others. I am not a "mechanic." I am just a parts replacer/assembler with enough basic common knowledge to do my own work. I know the philosify behind this intake must have something to do with velocity but I don't understand this. I have never seen an intake done this way so I am looking for a little history on it. I am also curious if it really works and how well. Thanks
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    Last edited by customtouch; 06-08-2012 at 08:13 AM.

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    Quote Originally Posted by customtouch View Post
    I saw this intake for sale and this doesn't make sense to me. It is suppose to be for a square port BBC but I don't understand the varience in the port size. If you look close, you can see from the gasket marks how it fits the ports of the heads. How could this intake possibly work well with half of your cylinders getting 1/4 less fuel than the others. I am not a "mechanic." I am just a parts replacer/assembler with enough basic common knowledge to do my own work. I know the philosify behind this intake must have something to do with velocity but I don't understand this. I have never seen an intake done this way so I am looking for a little history on it. I am also curious if it really works and how well. Thanks
    That looks like someone was experimenting. The conventional BB Chevy head (if you look at the intake ports) has a left port, and a right port. The left port has always been problematic from a flow perspective because of it's architecture. For one thing, it's shorter than the right port. It's also always bigger in cross sectional area. This gives the left and right port two completely different flow characteristics which, when trying to make max. power, is not ideal. Everything under the sun you can imagine has been tried to make the two ports "the same" and this just looks like another one of those attempts. This intake was obviously matched up to a set of heads with the same mod's. Find those heads and you might have something. Otherwise what was done, needs to be "un done" to use it with standard BB heads.
    Hope that helps.
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    gn7
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    Quote Originally Posted by steelcomp View Post
    That looks like someone was experimenting. The conventional BB Chevy head (if you look at the intake ports) has a left port, and a right port. The left port has always been problematic from a flow perspective because of it's architecture. For one thing, it's shorter than the right port. It's also always bigger in cross sectional area. This gives the left and right port two completely different flow characteristics which, when trying to make max. power, is not ideal. Everything under the sun you can imagine has been tried to make the two ports "the same" and this just looks like another one of those attempts. This intake was obviously matched up to a set of heads with the same mod's. Find those heads and you might have something. Otherwise what was done, needs to be "un done" to use it with standard BB heads.
    Hope that helps.
    I believe its an Edelbrock. They did a similar thing on the first Tarantuas for the BBC. I don't think the floor of that manifold was filled. It was cast that way.
    If you look at the ports in the manifold, not only is the one smaller, but the roof is higher. I am pretty sure than was done by a porter to match a raised port done on the head. Again, like Steel said, in an effort to equalize the flow compared to the 'good' port.

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    Last edited by gn7; 06-08-2012 at 09:24 AM.

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    Edelbrock had two designs of the TR-2X tunnel ram early and late something about tuning the ram tube length like other's had done on inj ram tubes like crower setup. Pretty rare to find one that someone has not tried to grind it out. good piece of history there.

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    I thought it was a home made abortion at first but I did have one person tell me that he used to have one like it a long time ago so I think it was used in production. I was thinking like Steelcomp, that it was probably produced to match up with a set of custom made heads of the same brand and sold as a package or something. I may be wrong but I would think that using this on a stock set of heads you would lose more than you gained but that is why I am asking because this is way over my head. I know "back in the day" there was a lot of experimenting done to gain a little advantage and most of it was trial & error based on theory. I assume this did not work that well or else it would still be around.
    Last edited by customtouch; 06-08-2012 at 11:28 AM.

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    Sig Erson had an interesting approach for the Right and Left port thingy, he ground a Tri-Flow camshaft. One port had the Cam ground with 110 lobe centers and the port next to it was ground with 108 degree lobe centers and the Duration was different. The Valve lash was different also which meant you had 3 settings, L-Intake, R-Intake, and Exhaust. His son John ground me one once. It worked OK
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    Quote Originally Posted by customtouch View Post
    I thought it was a home made abortion at first but I did have one person tell me that he used to have one like it a long time ago so I think it was used in production. I was thinking like Steelcomp, that it was probably produced to match up with a set of custom made heads of the same brand and sold as a package or something. I may be wrong but I would think that using this on a stock set of heads you would lose more than you gained but that is why I am asking because this is way over my head. I know "back in the day" there was a lot of experimenting done to gain a little advantage and most of it was trial & error based on theory. I assume this did not work that well or else it would still be around.
    No, the manifold may be tweeked. It looks like the one higher port was done by somebody. But the floor of the smaller port was cast higher from Edelbrock. I seriously doubt the heads that was bolted to matched the smaller port.


    Quote Originally Posted by LeE ss13 View Post
    Sig Erson had an interesting approach for the Right and Left port thingy, he ground a Tri-Flow camshaft. One port had the Cam ground with 110 lobe centers and the port next to it was ground with 108 degree lobe centers and the Duration was different. The Valve lash was different also which meant you had 3 settings, L-Intake, R-Intake, and Exhaust. His son John ground me one once. It worked OK
    Don't give Sig too much credit for that. Clay Smith was doing that to Flatheads when Sig was in diapers. It says something when Smokey Yunick says Clay Smith was the smartest of all of them. Not to take anything away from Sig, but he was no different than anybody else, he had to learn from others at some point. The ones he learned from were the best in the business.



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    Last edited by gn7; 06-08-2012 at 12:56 PM.

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    Bostick Racing Engines six-oh-nine's Avatar
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    It's an Edelbrock UR2X... short lived variance of the TR2X. As Steel pointed out... the shorter runner was supposed to be a crutch to help balance the ports... but it wasn't designed for special heads or anything... it was just that... an attempt at a crutch. I've run across a couple of these over the years and the best advice I could give is they work much better when you just port them to match rather than try to use "as is". Of course this is totally annicdotal information, but on both motors I used them on they BOTH (427 and 481) saw significant gains going conventional port... 481 picked up 300 RPM and was more responsive 3500 on up just reworking the intake. Not the best intake in the world, or even second or 23rd, but they can work pretty good on 427 and 481 chevies with 660's type of deal.
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    Quote Originally Posted by six-oh-nine View Post
    Not the best intake in the world, or even second or 23rd, but they can work pretty good on 427 and 481 chevies with 660's type of deal.
    OK now that is pretty funny.

    so that makes slightly better than the original TR1 shoebox plenum which has to rate 30th or higher.



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    Oh Bob, your forgetting the bolt on center plenum chamber that Edelbrock came up with to salvage their manifolds and to keep the fuel from pooling up in the manifold and exploding in the shoebox manifolds!!!!!!!!!!!!!

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    Quote Originally Posted by Spudpilot View Post
    Oh Bob, your forgetting the bolt on center plenum chamber that Edelbrock came up with to salvage their manifolds and to keep the fuel from pooling up in the manifold and exploding in the shoebox manifolds!!!!!!!!!!!!!
    This thing? nah, fuel could never puddle in this thing




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    Quote Originally Posted by gn7 View Post
    This thing? nah, fuel could never puddle in this thing
    looks like an icecube tray with 8 holes in it to hold drinks...

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    It is better suited for that.
    I think the center plenum chamber that Spudpilot is refering to was really more of a center plenum plate that look like this except it went in like a spacer and was just sandwiched in. Its the only "fix" I remember.

    Alot of them were simply filled with casting resin




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    Last edited by gn7; 06-08-2012 at 03:09 PM.

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    Quote Originally Posted by gn7 View Post
    It is better suited for that.
    I think the center plenum chamber that Spudpilot is refering to was really more of a center plenum plate that look like this except it went in like a spacer and was just sandwiched in. Its the only "fix" I remember.

    Alot of them were simply filled with casting resin
    I remember seeing those... matter of fact, Farmer John still has one kicking around in the shelves of his shop. Nostaliga for sure. Great idea... not so much.
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