Tunnel Ram & 2 4's
#1
Fast Singles Club
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Tunnel Ram & 2 4's
Why don't i see this on bigger cubic inch marine engines ? Would this help a 540ci and bigger breathe ? I just need to know . deep
#3
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Every dyno test I've seen shows that tunnel rams are as good as dual plane on the low end and better than single planes on the top. I know Engine Masters magazine did some side by sides and the tunnels worked best overall by a significant margin.
#4
#5
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Idle characteristics?
#6
Racer
Racer
I have a tunnle ram on my 588 ci 14 to 1 engine idle in cold weather can be a little fun works best in upper rpm .
When i built my 588 i went big bore short stroke so i could rpm it to take advantage of the tunnle ram.
Nothing like a big chevy at 6800 rpm sounds cool.
Go to 2012 loto part 1 on you tube we are about the 15th boat running sounds cool.
When i built my 588 i went big bore short stroke so i could rpm it to take advantage of the tunnle ram.
Nothing like a big chevy at 6800 rpm sounds cool.
Go to 2012 loto part 1 on you tube we are about the 15th boat running sounds cool.
#7
Fast Singles Club
Gold Member
Thread Starter
iTrader: (8)
I have a tunnle ram on my 588 ci 14 to 1 engine idle in cold weather can be a little fun works best in upper rpm .
When i built my 588 i went big bore short stroke so i could rpm it to take advantage of the tunnle ram.
Nothing like a big chevy at 6800 rpm sounds cool.
Go to 2012 loto part 1 on you tube we are about the 15th boat running sounds cool.
When i built my 588 i went big bore short stroke so i could rpm it to take advantage of the tunnle ram.
Nothing like a big chevy at 6800 rpm sounds cool.
Go to 2012 loto part 1 on you tube we are about the 15th boat running sounds cool.
#9
Racer
Racer
We broke a 100 mph so i new i could step up the record from last year so i did no more tuning that being said it ran ok with out of the box gary williams carbs and would idle around at 1000 rpm .
If you fuel inject it a lot of problems go away.
But to get the real advantage of a tunnel ram be ready to turn some rpm so dont scimp on the valve train.
Last edited by gary cook; 11-06-2012 at 07:56 PM.
#10
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JimV (Valako) runs a Holley Dominator tunnel ram manifold modified for EFIon his 565 with twin 1000cfm throttle bodies. I believe the dyno was 787HP@6200. And it was not lacking torque. They make power. Last year he tried twin 750 carbs and lost power.