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  #16 (permalink)  
Old 11-07-2011, 08:01 PM
lakeroadster's Avatar
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Here is a link to an online calculator that should help when selecting what size carb. is needed: http://www.4secondsflat.com/Carb_CFM_Calculator.html

Unless you have done significant work to make the engine more efficient (porting, polishing, big valves, etc.) and unless the motor is capable of very high rpm shift points this calculator shows 600 cfm is what is required.

Alot of guys throw too much carburator at a motor and then are disappointed at the driveabilty. With a tunnel ram, in a non-racing application, less is more.

A friend of mine had a tunnel ram on his daily driver '72 C10 back in the early 90's. He used (2) 450 cfm carbs, jetted down very lean. The truck was very streetable, he even drove it in the winter time. Only down side was he always would wait for the engine to come up to temperature before driving. Just as was previously stated, letting the tunnel ram warm up helps a lot when it comes to driveability.

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Old 11-12-2011, 07:21 PM
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now iv ben thinkin about a 13.1 355 sbc well lets say .465 dome pistons, had ported 305 heads on it with a mag280 comp, ran a 7.50 in tha 8th sittn in a 65' chevelle, so tunnal raming a 355 now?? my mind is running wild , and yea my plan is to recalibrate the two 600 eddy carbs till more $ flow for two 450's....
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Old 12-29-2011, 08:03 PM
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hey guys, i am running a 290 hp Crate motor with a bigger cam, headers and a 1984 weiand Tunnel Ram, with 2 600 eddy's. I have no street driving issues,timing is locked at 36*,2200 stall 700R4 trans, 4.10 gears
but i do upset a few guys at the track. this is a 8.5:1 motor and it screams..
cant wait to put on my other heads..bring it up to 10.0:1
here is a video of me at the track.



Also, I am the 72 Grey camaro

They other camaro is a 79 with a 350 and 177 weiand Blower..
(He never Caught me)

if video doesnt work here is the link..http://www.youtube.com/watch?v=H3KPO...WIdDLI0U_d7-wW

Last edited by PENSKR22; 12-29-2011 at 08:11 PM.
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Old 12-30-2011, 08:38 AM
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Quote:
Originally Posted by Jake_Dragon
Its an edelbrock tunnel ram
from the homework I have done
the old edelbrock TR has smaller ports, so they seem to be the best for street applications
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Old 12-30-2011, 08:28 PM
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Quote:
Originally Posted by matts37chev
from the homework I have done
the old edelbrock TR has smaller ports, so they seem to be the best for street applications
The TR I am using is the old Edlebrock TR1X. It uses small plenum and long runners. It produces better low end response.

Last edited by lg1969; 12-30-2011 at 08:42 PM.
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  #21 (permalink)  
Old 12-31-2011, 03:24 AM
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Quote:
Originally Posted by matts37chev
from the homework I have done
the old edelbrock TR has smaller ports, so they seem to be the best for street applications
It does ok, better than I expected. The trans and rear end are not geared very well for the tunnel ram and I may swap it with my other car as a manual transmission would be a lot more fun with this setup.

I know it has the larger plenum on it, vacuum pressure is a problem and effects my braking at low RPMs
I was surprised at how well it drives when its cold, not brutal cold I do live in Florida but it does reasonably well when its in the 30s and 40s

The only thing I don't like is it is a thirsty setup
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Old 12-31-2011, 10:46 AM
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i have my timing locked @ 34* i have Excellent off idle performance, i deffinetly notice a huge change in performance from the T-RAM and my single plane Hurricane intake.. I dont have any street issues i have run it on the street for a year, no issues and no constant tuning either..also it is very intimidating... but i have since covered it with 6'' cowl hood.
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