04-02-2019, 09:33 PM | #1 |
Join Date: Nov 2016
Location: robertsdale alabama usa
Posts: 1,007
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neat ideas on head porting
stumbled upon this nad i think may be of interest to some here. five or six parts to it. http://mototuneusa.com/power_news_--_think_fast.ht
may or may not relate to our 14 hp monsters but it might.
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04-02-2019, 10:12 PM | #2 | |
Join Date: Jan 2018
Posts: 410
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Quote:
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04-03-2019, 12:09 AM | #3 |
Join Date: Mar 2019
Posts: 1
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First go to the base url: http://mototuneusa.com/
Then scroll down to the bottom of the page, and on the lower left corner look for: Power News Preview No idea why it forces you to do it manually. |
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04-03-2019, 12:22 AM | #4 |
Join Date: Nov 2016
Location: robertsdale alabama usa
Posts: 1,007
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this was copy and paste from part 2 http://mototuneusa.com/power_news_--_homework.htm
maybe its the dashes messing it up
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1991 harley heritage softail classic 2016 hawk kaw h1 400 tripple 13' long chopper in progress 2009 johnny pag bar hog 2004 hd electra glide ultra classic shriner edition 1997 harley davidson 1200 sportster 1972 harley davidson amf sx250 |
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04-03-2019, 12:24 AM | #5 |
Join Date: Nov 2016
Location: robertsdale alabama usa
Posts: 1,007
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this is the page for all links http://mototuneusa.com/thanx.htm
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1991 harley heritage softail classic 2016 hawk kaw h1 400 tripple 13' long chopper in progress 2009 johnny pag bar hog 2004 hd electra glide ultra classic shriner edition 1997 harley davidson 1200 sportster 1972 harley davidson amf sx250 |
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04-03-2019, 12:11 PM | #6 |
Join Date: Dec 2015
Location: CO
Posts: 1,525
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Basically "Clay and shape for a Smaller/Velocity Stacked Intake Ports to gain 7% more power"
There is someone with a KLR650 that claims their "Big Bore/fully built engine" is making close to 90 horsepower (at the wheel) with the help of "Small/Velocity Stack Intake Porting"... the power/numbers I feel are a bit suspect due to the Dyno they are using... seen too many "extremely happy customers" when they get numbers back on their (stock) bikes/cars...
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04-03-2019, 03:15 PM | #7 | |
Join Date: Jan 2019
Location: Silver City New Mexico
Posts: 290
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Basically the ports( 4 venturi heads)(4V ) were hugh by factory standards and a lot of horsepower could be had at very high rpms . The 2 venturi heads (2V)were too restrictive by the same measures. Because the 351C engines were used in mustangs ( and others ) the factory did not want them revving to 7000 plus rpm where the ports started to work well. You could a few years ago buy a port plate that pretty much covered up about a third of the port ( looked similar to the jb welded port). Much better torque and horsepower was the result. The Australians Built a new cyl head (called a 3V )that took the best properties of the 2 heads . Some one needs to try it on the 229 and let us know. |
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04-03-2019, 07:51 PM | #8 | |
Join Date: Jun 2011
Posts: 1,335
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04-03-2019, 09:44 PM | #9 | |
Join Date: Jan 2019
Location: Silver City New Mexico
Posts: 290
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Did your truck have a 4 barrel carb or a 2 barrel ? |
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04-03-2019, 10:38 PM | #10 | |
Join Date: Sep 2017
Location: N Texas
Posts: 706
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Cleveland was a great motor. |
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04-04-2019, 01:59 AM | #11 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,110
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Taking the already well designed ports that the manufacturer spent thousands of hours designing, modeling, simulating, and testing to get the right balance of intake velocity, flow, and swirl, hogging them out way too big, and then adding a sharp turn on the short side radius right before the valve is about as bad of an idea as I have ever seen.
I get what they are trying to do, but they have nothing to back up their claim with. 7% more power? That's vague. 7% more power where? A before and after dyno plot of multiple runs would be far more convincing. They likely picked up a little more power in the lower RPM range due to that higher velocity, but I would almost bet there is a loss in high RPM power due to a decrease in total mass flow. Decreasing the cross section right at the radius, right before the intake valve seat will do exactly that, decrease mass flow (and likely increase turbulence). In fact, if you want to watch a good counter video to this whole idea, I welcome you to watch one of my favorite channels who does a great response to this whole methodology.
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04-04-2019, 10:22 AM | #12 | |
Join Date: Jun 2011
Posts: 1,335
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Quote:
It was a 4 barrel and the only owner before me upgraded to a Holley 850cfm. It ran really good and had a lot of low end torque. Low redline of 5000 rpm, IIRC. So far as I know, the truck was all original. The owner bought it new. I grew up working on cars with him. He was my mentor of sorts. He bought the truck back from me a year and a half after I bought it from him. The bed had some rust issues. He had another short bed parts truck that had been hit in the front and had frame damage. He used the short bed from that truck, cut down the chassis on the good truck, and made it into a short bed. It looked really good when he was done. Couldn't tell the truck had ever been shortened. |
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