Tunnel Ram 467 Engine Build

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vortecpro
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Tunnel Ram 467 Engine Build

Post by vortecpro »

IMG_0380.JPG
A while back I built this 467. 4.310 X 4.00, 43 cc Mahle piston with the dome cut down, the cam was a solid roller .620/,612/265/270/108 very mild lobes. I ported up a set 781 GM oval ports with 2.190/1.880 valves. We used a Edelbrock oval port street ram and ported it, hung 750 carbs on top. The crank was a GM steel 454 7416 crank, we indexed it and set stroke right at 4 inch, the counter weights were cut .250. A resized Scat 6,385 I beam rod was used. A Moroso 20403 pan was modified with 6.3 quarts of 30w breakin oil, M77 oil pump. Fuel was VP Q-16 Some pictures of the build.
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Re: Tunnel Ram 467 Engine Build

Post by NormS »

Isn't 7:1 a bit fat for VP Q16? You would think that making 732hp from about 260 lbs/hr fuel flow, it would be a little leaner than that.
Seriously, what was your atmospheric CF that day?
Obviously, you're measuring airflow through only one carb, which makes your real A/F ratio in the 14's, and BSAC's in the 6's. Aren't 14's a bit lean? Why not use a couple of wide band O2 sensors in the collectors, and get some real numbers?
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Re: Tunnel Ra......... 467 Engine Build

Post by vortecpro »

To answer your questions:

1. Max power was in the 14s as shown
2. Some use wide bans, I use the air turbine, works fine for me
3. Seriously my dyno sits @ 6400 feet elevation, the following conditions existed

Air temp 81 degrees
Barometer 23.76
Vapor pressure 0.11
Humidity 10
SAE correction 1.241
STP correction 1.29
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Re: Tunnel Ram 467 Engine Build

Post by Carnut1 »

732 hp with 781's! Love it, did you bother to flow them after porting? Thanks, Charlie
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Re: Tunnel Ram 467 Engine Build

Post by F-BIRD'88 »

Good job.
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Re: Tunnel Ram 467 Engine Build

Post by NormS »

The Superflow air turbines are notoriously "optimistic". I suspect your A/F ratios are somewhat richer than 14's.
If you were to use some O2 sensors, I think their readouts would disagree with A/F ratios calculated from the Superflow measured air flow and fuel flow.
Last edited by NormS on Sun Jun 24, 2018 1:02 pm, edited 1 time in total.
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Re: Tunnel Ram 467 Engine Build

Post by vortecpro »

Carnut1 wrote: Sun Jun 24, 2018 11:22 am 732 hp with 781's! Love it, did you bother to flow them after porting? Thanks, Charlie
332 @ 28 inches @ .600 lift. The average power is what I like.
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Re: Tunnel Ram 467 Engine Build

Post by Carnut1 »

vortecpro wrote: Sun Jun 24, 2018 1:01 pm
Carnut1 wrote: Sun Jun 24, 2018 11:22 am 732 hp with 781's! Love it, did you bother to flow them after porting? Thanks, Charlie
332 @ 28 inches @ .600 lift. The average power is what I like.
Mark, I see you are using that airflow efficiently. Nice work!
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Re: Tunnel Ram 467 Engine Build

Post by F-BIRD'88 »

Do you remember what the finished compression ratio was?
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Re: Tunnel Ram 467 Engine Build

Post by vortecpro »

F-BIRD'88 wrote: Wed Jun 27, 2018 10:44 pm Do you remember what the finished compression ratio was?
I never exactly checked it, but probably around 12.1. I have a 496 dyno/drag test coming soon, very excited about this one in the same format as the peanut port dyno/drag test.
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Re: Tunnel Ram 467 Engine Build

Post by prairiehotrodder »

This is where i get embarrassed that my 540 t-ram motor only goes 9.84 with all the best junk on it.

Looks awesome Mark ! I can't wait for the results of the drag test !
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Re: Tunnel Ram 467 Engine Build

Post by F-BIRD'88 »

prairiehotrodder wrote: Thu Jun 28, 2018 12:49 pm This is where i get embarrassed that my 540 t-ram motor only goes 9.84 with all the best junk on it.

Looks awesome Mark ! I can't wait for the results of the drag test !
Do not confuse the SAE corrected dyno power with the real engine power you make at your (high) elevation.
Get your weather data for your day at the track and correct the performance to sea level 60F dry air and see how fast it goes.

Same with this engine Look at the raw uncorrected dyno power

at the elevation Corected dyno power divided by correction factor.
That is what it will ( really do) do when stuffed in a car at that (high)
elevation
we all run on "uncorrected horsepower" in our cars.

local historical weather data is available on the net.

this is a good build.

Any more info on the camshaft with the moderate .600" ish valve lift?

Would be a great street motor at 10.50:1cr
And great built as a 496cid too.
especially at or near sea level elevation.
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Re: Tunnel Ram 467 Engine Build

Post by F-BIRD'88 »

VortecPro: any info on the Eddy oval port tunnel ram before and after porting.
EG port runner cross sectional area before and after the porting.
IMHO the Eddy street and Victor tunnel rams are better than the Weiand Hi RAM intakes.

Again a good build any way you cut it.
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Re: Tunnel Ram 467 Engine Build

Post by vortecpro »

F-BIRD'88 wrote: Thu Jun 28, 2018 1:39 pm VortecPro: any info on the Eddy oval port tunnel ram before and after porting.
EG port runner cross sectional area before and after the porting.
IMHO the Eddy street and Victor tunnel rams are better than the Weiand Hi RAM intakes.

Again a good build any way you cut it.
Thanks, the cam was a made to be street drivable, never did any measuring on the intake, the customer wants to drive the car to the track.
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Re: Tunnel Ram 467 Engine Build

Post by prairiehotrodder »

I just watched your youtube video of the 650 hp 496 and the video showing your chevelle street drive. I think i'm finally starting to put together the pieces of the puzzle why its so quick with what seems relatively plain parts.
To my way of thinking, the motor is under cammed and the car is over geared. Thats just the way i've learned to think. But the fact is it works really well so why ? I'm guessing its got a convertor that keeps the motor in a very small rpm range as well. The 3 speed tranny along with the ATI convertor and the 4.56 gears would have the motor within a very small rpm range all the time. Also the motor is designed to breath well past where the cam peaks in power. Therefore in the traps its still pulling well past its peak hp rpm. What rpm is the motor at on the finish line ? What is the convertor stall speed ? Does the weight in the trunk make the car faster or slower ? I think that if it every spun it would be a wasted run. This car needs to dead hook which it does very well. I know this is a little off topic of this thread but i didn't know where else to put it.
Keep the videos coming !!! Great job !
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