porting tpi runners and manifold,
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
Re: porting tpi runners and manifold,
Well, all you can do now is take measurements and see where the problem lies.
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Re: porting tpi runners and manifold,
They have a little blurb on that drawing and it being proprietary and not for reproduction without their consent. I'm just taking a guess, but I'm betting you dont have that. So... may want to rethink posting that up.
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From: sf bayarea
Car: 91 z28
Engine: 350/ported accel tpi/AFR 195
Transmission: t-5 =(
Axle/Gears: 345
Re: porting tpi runners and manifold,
Yeah i just read that so i took it off lol thanks for the heads ups i didnt even look at that.
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From: sf bayarea
Car: 91 z28
Engine: 350/ported accel tpi/AFR 195
Transmission: t-5 =(
Axle/Gears: 345
Re: porting tpi runners and manifold,
I also put the manifold on the old 305 i have sitting in the garage and the thing fits perfectly on there with the middle of the port on the manifold thinner. So its not a manifold issue.
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
Re: porting tpi runners and manifold,
I had a chance to do some measuring today. The divider wall between the two ports on a stock TPI intake manifold is about .250". I measured the same on an Edelbrock TPI intake manifold and the nominal wall between the two ports again is around .250".
I remembering measuring Dyno Dons AFR 195 Eliminator heads and the divider wall thickness was around .230". I did that measuring because my Accel base in that area had been ground down to thin and I have to have weld it back up. I hope this has been of some help to you.
I remembering measuring Dyno Dons AFR 195 Eliminator heads and the divider wall thickness was around .230". I did that measuring because my Accel base in that area had been ground down to thin and I have to have weld it back up. I hope this has been of some help to you.
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From: sf bayarea
Car: 91 z28
Engine: 350/ported accel tpi/AFR 195
Transmission: t-5 =(
Axle/Gears: 345
Re: porting tpi runners and manifold,
I had a chance to do some measuring today. The divider wall between the two ports on a stock TPI intake manifold is about .250". I measured the same on an Edelbrock TPI intake manifold and the nominal wall between the two ports again is around .250".
I remembering measuring Dyno Dons AFR 195 Eliminator heads and the divider wall thickness was around .230". I did that measuring because my Accel base in that area had been ground down to thin and I have to have weld it back up. I hope this has been of some help to you.
I remembering measuring Dyno Dons AFR 195 Eliminator heads and the divider wall thickness was around .230". I did that measuring because my Accel base in that area had been ground down to thin and I have to have weld it back up. I hope this has been of some help to you.
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iTrader: (3)
Joined: Sep 2003
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
Re: porting tpi runners and manifold,
With the Felpro 1205 gasket you have to cut a hole for the heat riser/ egr port. Only needed on one side but make sure it is on the proper side or it will be blocked off. I have the AFR 195 Competition version and it calls for the Felpro 1206 gasket. Same thing though for the egr as you have to cut a hole in the gasket.
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From: sf bayarea
Car: 91 z28
Engine: 350/ported accel tpi/AFR 195
Transmission: t-5 =(
Axle/Gears: 345
Re: porting tpi runners and manifold,
j over at afr said he would send me a head gaskets and a 1256 intake gasket and arp bolts. If I wanted to offset the price a little . But if I pull the heads it voids the warranty that the machine shop gave me. Hmmm any ideas? I do know if I have to operate on the afr I will need a 1205 will I have to pull the rockers off?
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From: sf bayarea
Car: 91 z28
Engine: 350/ported accel tpi/AFR 195
Transmission: t-5 =(
Axle/Gears: 345
Re: porting tpi runners and manifold,
I just got off the phone with Dr J they charge a 1000 dollers a manifold to weld and port OMG thats a ton of money
thank goodness for the guys on here who port.
thank goodness for the guys on here who port.
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From: Iowa
Car: '97 GTP
Engine: 385 sbc, 3.8 Supercharged L67 V6
Re: porting tpi runners and manifold,
Big bucks!
It's a ton of work though too.
In my opinion 1000 is still to much for the gain you get. Money better spent on something else, like a good full port to the entire TPI with money left to spare!
It's a ton of work though too.
In my opinion 1000 is still to much for the gain you get. Money better spent on something else, like a good full port to the entire TPI with money left to spare!
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From: Central Texas
Car: 1987 L98 IROC-Z
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: 3.27 9 Bolt
Re: porting tpi runners and manifold,
"why not just use a miniram or an intake that already has a short runner?"
One reason would be you can customize the total runner length to take advantage of "wave tuning". The 4th harmonic is worth 4%. The third harmonic worth 7% and the 2nd harmonic is worth 10%. If going for the 2nd harmonic you will use all three boost rpm ranges. The stock TPI uses the 3rd harmonic range for its boost. Most are well aware of the boost that creates. I might add that the LS1 type manifolds also use the 3rd harmonic wave. One more aspect is from I have read it is best to have the runner volume roughly equal to the volume of the cylinder. This helps in the added boost in flow from the kinetic energy from the ramming of the air mass into the cylinder. Again check out the LS1 type manifolds. If done right and with a good exhaust you can create up to 5 pounds of boost.
Bryce that looks real good. I am having my welder add some more weld beyond the fuel rail posts. When the machining and welding is done I will get my manifold over for you to do the porting.
Guys we have a car with a Super Ram recently done by Bryce and I do not believe to the extent of the above photos but the performance was well above average. Everyone attending the dyno session took notice. The results have been posted on this forum with Dyno Don the originator of the post.
Allen
Edit: Here is a link to the subject. An interesting read and talks about total runner volume.
http://www.speedtalk.com/forum/viewt...r+csa&start=15
One reason would be you can customize the total runner length to take advantage of "wave tuning". The 4th harmonic is worth 4%. The third harmonic worth 7% and the 2nd harmonic is worth 10%. If going for the 2nd harmonic you will use all three boost rpm ranges. The stock TPI uses the 3rd harmonic range for its boost. Most are well aware of the boost that creates. I might add that the LS1 type manifolds also use the 3rd harmonic wave. One more aspect is from I have read it is best to have the runner volume roughly equal to the volume of the cylinder. This helps in the added boost in flow from the kinetic energy from the ramming of the air mass into the cylinder. Again check out the LS1 type manifolds. If done right and with a good exhaust you can create up to 5 pounds of boost.
Bryce that looks real good. I am having my welder add some more weld beyond the fuel rail posts. When the machining and welding is done I will get my manifold over for you to do the porting.
Guys we have a car with a Super Ram recently done by Bryce and I do not believe to the extent of the above photos but the performance was well above average. Everyone attending the dyno session took notice. The results have been posted on this forum with Dyno Don the originator of the post.
Allen
Edit: Here is a link to the subject. An interesting read and talks about total runner volume.
http://www.speedtalk.com/forum/viewt...r+csa&start=15
Again I am just trying to set the record straight for any other guys who wish to pursue the inevitable wall of tuned port injection runner length. Any of my posts are welcome to a correction! We are all here to learn. We all make mistakes. Me included... Thanks
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