intakes
 

Getting ready to put my new 540s in the boat. No intakes yet N/A. Has any one run 2x4s on their motors instead of a single 4 barrel.If so any gains by doing this.Or is it just a waste of money. Thanks JOHN

Tunnel rams make great power.

Chris

Not really much good in it unless you use the tunnel rams. The low rise intakes won't give you the extra flow that you will need.

A weiand team G and a single Dominator will do fine in that app. if you dont have room under the hatch for the rams.

Depending on how big a cam you are running, you can use an 800 cfm 4150 flange holley and an edelbrock 454-R victor Jr intake and make good power and use a little less fuel. Won't rob that many HP compared to the dominator.

If you can aford the fuel and if it will fit under the hatch, the tunnel rams are the way to go to squeeze the most HP out of the engine.

I have a half a dozen older boats running tunnel rams. Make great power and with good carbs such as a BG mighty Demon, idles nice with out loading up. I will look into something for you John ......I have an idea!:D

A Tunnel Ram can work extremely well on an engine like this. Zul used to offer a combination like this in the past, and it ran extremely well.

Tunnel ram
 

Hi Dean! Was just out here on the board askin the question we had talked about.I though a little input from the members would help me out as far as the carbs. Believe me I STILL will go the way you best think will work for me. O buy the way dean my fountain is a OLDER boat non step 1991 LOL!!! Thanks Dean for gettin involved in my project. JOHN

Just in cse you don't go with the rams, I have 2 TeamG's 2 1150 Dominators from Nickerson (recomend to send them back and get them refreshed) and 2 stainless flame arrestors if you are interested. I was going to use them on another project, but have gone with blowers instead.

Tunnel rams are the best though.

Yep.........and I still do. How's Doug been brother?:cool-smiley-027:

Can't complain, just getting up to speed with work. How bout you Deano?

Would the tunnel ram have any effect on throttle response? I understand the basic principle is to have a nice straight non-turbulent flow hitting the intake valve but the additional runner length cause a lag? Also, what about over-carburetion? Is there an offset due to the fact that you're getting better flow or is CFF just CFM, regardless of manifold design or number of carburetors?

Yes, and no...

If you were to take a Tunnel Ram off of a Drag Race engine that is desgined to work at 10,000 RPM yes it would have a lag. If you design the package properly taking into consideration the heads, runner size, runner length, shape, plenum size, and carburetor sizes you won't have a problem at all.

YEP. Good answer. :Score-101010:

OK then- let's do a common test case-

540 ci, Crane 741, 9:1 comp, good aluminum heads (probably non-cnc)

This combo would probably have something like the Dart intake and a 1050 on it in a single 4 barrel configuration.

So in a TR setup, what manifold, what carburetors and why?

You'd really need the specific heads to see what's going to work best. If it were mine I would not use the same heads or cam as a single 4bl engine.

Believe it or not , the old Holley Pro Dominator tunnel ram works very well in a marine application with it's smaller plenum volume. I have a pair of 572 Donovan blocked T-ram engines in a 1990 Cigarette 38 Top Gun that runs 92-93 mph. They work great!

WEIAND 5885. Old school ram. put dual 4150flange 600CFM HiPo Holleys. Unless you are getting nasty with a cam over .680. Then use 750's

You can also use a single dominator on a Tunnel ram, but I have not, nor know anyone who has tried it.

Idle and docking has never been that big an issue. It seems that dock manners for me have always been in the camshaft and how much is left in the cooler.

I have a 582" engine with oversized combustion chambers that I built ffor a blower, but am actually probably going to put a Ram on, since I have one lying around. If I get around to it, I will post numbers.

Dr. Dean, how is my answer to Chris's test question?

So what carbs would you use on our hypothetical 540 motor? Is cam a consideration? If so, why?

I used this same basic combination on a 400" small block with fantastic results. Used 450's, not 600's.

[QUOTE=jeff1000man;2453015]WEIAND 5885. Old school ram. put dual 4150flange 600CFM HiPo Holleys. Unless you are getting nasty with a cam over .680. Then use 750's

You can also use a single dominator on a Tunnel ram, but I have not, nor know anyone who has tried it.

Idle and docking has never been that big an issue. It seems that dock manners for me have always been in the camshaft and how much is left in the cooler.

I have a 582" engine with oversized combustion chambers that I built ffor a blower, but am actually probably going to put a Ram on, since I have one lying around. If I get around to it, I will post numbers.

NOT BAD JEFF ,P.M. me on those carbs if u still got em ..Leon get those heads done ??? he's suppose to call here at noonish
ROCK ON !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!

A true tunnel ram intake with a single 4bl is NEVER a good idea. You can have distribution issues. If you're going to run a single 4bl, use a single 4bl intake manifold.