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Lower EFI intake runner for performance?

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guhfluh
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Posts: 419
Joined: Wed Jul 10, 2013 9:40 am

Lower EFI intake runner for performance?

Post #1 by guhfluh » Thu Oct 03, 2019 7:41 pm

Anyone know the runner length and diameters of the EFI lower?

What is the effective head runner length/size to the back of the valve?

What I'm curious about is the effective tuning RPM of just the lower and it's power potential or at what point it would become a restriction. I'm also interested in building a plenum on top with a forward facing throttle body, but haven't looked up volume Calcs just yet.
1967 F-250 Crew Cab 2wd, 300 6cyl, T-170/RTS/TOD 4-speed overdrive
240 head, Offy C, EFI exhaust manifolds, Comp 268H, mandrel 2.5-3" exhaust, Edelbrock 500, Pertronix ignitor and coil, recurved dizzy. 200whp/300wtq

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jgregg13
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Re: Lower EFI intake runner for performance?

Post #2 by jgregg13 » Fri Oct 04, 2019 1:49 pm

guhfluh wrote:Anyone know the runner length and diameters of the EFI lower?


The length is 9.88" +/- 0.10" and the I.D. at entry is 1.625".
I have not measured the port dimensions.

guhfluh
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Posts: 419
Joined: Wed Jul 10, 2013 9:40 am

Re: Lower EFI intake runner for performance?

Post #3 by guhfluh » Fri Oct 04, 2019 2:21 pm

jgregg13 wrote:
guhfluh wrote:Anyone know the runner length and diameters of the EFI lower?


The length is 9.88" +/- 0.10" and the I.D. at entry is 1.625".
I have not measured the port dimensions.

Thank you. That is close to what I estimated and unfortunately what I feared the ID was near. It seems to me that the runner ID/cross section is smaller than needed for a performance application.

*After looking around through some calculators online, it seems like the CSA and runner length might actually work out decently for a performance application and peak torque somewhere above 3500rpm. I may still look into using one.
1967 F-250 Crew Cab 2wd, 300 6cyl, T-170/RTS/TOD 4-speed overdrive
240 head, Offy C, EFI exhaust manifolds, Comp 268H, mandrel 2.5-3" exhaust, Edelbrock 500, Pertronix ignitor and coil, recurved dizzy. 200whp/300wtq

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