tunnel ram advantage?
02-03-2004, 09:27 AM
#1
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Join Date: Oct 1999
Location: Battle Creek, MI
Posts: 3,532
tunnel ram advantage?
In a motor built for track only, and 3500-7500, when do you begin to see gains with a tunnel ram setup over a single carb setup? And how substantial are those gains?
The reason I ask is, I wonder if my motor is being choked by the 750 dominator and victor jr intake, especially considering the manifold has a 4150 type flange, and thus requires an adapter to mount the 4500 flange dominator.
If I were to rework the setup, I'd either sell the dominator and adapter and get a barry grant carb (something in the demon series) OR sell the the intake and adapter and pick up either a Brodix intake with dominator flange that would match my heads, OR sell the whole shebang and go to a tunnel ram and dual 500 or 660 setup.
But I don't know which setup will net me the most benefit.
Engine: 407 Ci, 40 over 400 splayed mains, poured with rock block (half), steel crank, Eagle rods, Wiseco pistons, molly rings, solid roller Reed cam Duration at .050 is 262/267 ADV Duration: IN 296 degrees, exhaust: 302 degrees Lobe Lift: IN .412" EX .417" Vavle Lift: IN .618" EX .625" @1.5 RR Valve Setting: IN .020" EX .022, zero decked block, Brodix Track I heads, 2.01 intake, 1.65 exhaust, intake runners 215 cc, triple valve springs, compression ratio 13.2 to 1, receiver grooved heads, block wire head gaskets, Victor Series intake, 750 Dominator carb., Hooker 2 inch longtube headers, 3 inch X pipe with 1 chamber Flowmasters. Transmission: Turbo 350 trans. with reverse valve body, 4400 stall converter. Rearend: 12 bolt GM differential, 456 ring and pinion with mini spool. Ignition System: MSD ignition, 7AL-2 with two-step, with rev. limiter pills. General Information: Channel for 4 link suspension. Car Weight: 3090 lbs. (without the driver) Brake line lock, trans. brake, B & M rachet shifter, Southside traction bars, 8 point cage.
Car will run high 6's in the 8th on motor only as it sits.
I am sure some of you have an opinion on this... let's hear it. A desktop dyno sumlation possibly?
The reason I ask is, I wonder if my motor is being choked by the 750 dominator and victor jr intake, especially considering the manifold has a 4150 type flange, and thus requires an adapter to mount the 4500 flange dominator.
If I were to rework the setup, I'd either sell the dominator and adapter and get a barry grant carb (something in the demon series) OR sell the the intake and adapter and pick up either a Brodix intake with dominator flange that would match my heads, OR sell the whole shebang and go to a tunnel ram and dual 500 or 660 setup.
But I don't know which setup will net me the most benefit.
Engine: 407 Ci, 40 over 400 splayed mains, poured with rock block (half), steel crank, Eagle rods, Wiseco pistons, molly rings, solid roller Reed cam Duration at .050 is 262/267 ADV Duration: IN 296 degrees, exhaust: 302 degrees Lobe Lift: IN .412" EX .417" Vavle Lift: IN .618" EX .625" @1.5 RR Valve Setting: IN .020" EX .022, zero decked block, Brodix Track I heads, 2.01 intake, 1.65 exhaust, intake runners 215 cc, triple valve springs, compression ratio 13.2 to 1, receiver grooved heads, block wire head gaskets, Victor Series intake, 750 Dominator carb., Hooker 2 inch longtube headers, 3 inch X pipe with 1 chamber Flowmasters. Transmission: Turbo 350 trans. with reverse valve body, 4400 stall converter. Rearend: 12 bolt GM differential, 456 ring and pinion with mini spool. Ignition System: MSD ignition, 7AL-2 with two-step, with rev. limiter pills. General Information: Channel for 4 link suspension. Car Weight: 3090 lbs. (without the driver) Brake line lock, trans. brake, B & M rachet shifter, Southside traction bars, 8 point cage.
Car will run high 6's in the 8th on motor only as it sits.
I am sure some of you have an opinion on this... let's hear it. A desktop dyno sumlation possibly?
02-03-2004, 08:45 PM
#2
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Join Date: Mar 2000
Location: 51°N 114°W, 3500' elevation
Posts: 2,037
It's hard to overcarb a race engine unless you go massive on a small engine. Find a second 750 dominator and mount them both on the tunnel ram.
Tunnel rams give a huge plenum volume. A race engine at high rpms can use that more than a street engine. I think tunnel rams work best in the 4500+ rpm range.
I currently use an 850 4150 on a victor Jr. I'm just about at the limits for this carb. A single 1050 dominator will work well and is a lot easier to tune than a couple of 750's or 850's on a tunnel ram but i'd still like the tunnel ram myself. Actually I want the tunnel ram with a Bird Catcher injection on it.
After looking at your sig, I think you'd be better off with an 850 4150 style or a 1050 dominator. What are you shifting at, about 6800?
Tunnel rams give a huge plenum volume. A race engine at high rpms can use that more than a street engine. I think tunnel rams work best in the 4500+ rpm range.
I currently use an 850 4150 on a victor Jr. I'm just about at the limits for this carb. A single 1050 dominator will work well and is a lot easier to tune than a couple of 750's or 850's on a tunnel ram but i'd still like the tunnel ram myself. Actually I want the tunnel ram with a Bird Catcher injection on it.
After looking at your sig, I think you'd be better off with an 850 4150 style or a 1050 dominator. What are you shifting at, about 6800?
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