Tunnel Ram Top spacer
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Tunnel Ram Top spacer

  1. #1
    I'm No Expert Shaun's Avatar
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    Default Tunnel Ram Top spacer

    I remember seeing a some of you guys running a nylon spacer on your tunnel rams between the manifold and the top. I talked with guy when i was first putting this motor together than they seamed to think a 1" spacer would be good to have on my engine. I was going to buy one to test when i was on the dyno but his computer crashed, and design or the CNC was on it. Where else can i find these spacers, anybody have any they arnt using, what types of gains did you see, etc..

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    the spacers are used to help keep the heat off the base of the carb/carbs, thereby, helping to keep the fuel cooler entering the plenum...what kind of manifold are you running?...what kind of carb/carbs are you running?...do you have any pics?

    FastRat

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    gn7
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    Quote Originally Posted by FastRat View Post
    the spacers are used to help keep the heat off the base of the carb/carbs, thereby, helping to keep the fuel cooler entering the plenum...what kind of manifold are you running?...what kind of carb/carbs are you running?...do you have any pics?

    FastRat
    I believe Shaun is refering to a spacer that goes between the T Ram and the top plate to increase the plenum volume. Shaun, if this is what your asking, I would be shocked to hear it was of any help. Usually used when the motor needs more carb on larger engines or high RPM. As I remember, your running 2 750s. I just don't think the spacer will add anything.



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    I'm No Expert Shaun's Avatar
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    I'm running a Edelbrock Vic Tunnel ram.

    Yes, i'm talking about a spacer that goes between the tunnel ram and the tunnel ram top. You may be right about that, i think back when i was first putting this mill together i still had those 660's. I know have 2 750's which are flowing 860 each according to the shop i got them from.
    Last edited by Shaun; 08-22-2010 at 05:43 PM.

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    Ebbert was the first builder I saw on the hot boat site to use the plastic spacer. Plywood has been used on many engines as a carb spacer. Plastic wont absorb the fuel,I know about sealing the plywood, but eventually. I think heat soak on a lake racer would be decreased if a plastic spacer was used. I also think ebbert used the spacer for adjusting the plenum size as his main objective. I could be wrong, I think. Plastic is cheap and easy to machine. Ask CS 19, He is more familiar with these items a few yrs ago. This may turn into a great topic on tunnel rams. Plenum volume/ Carb size/ tunnel ram mfgr. Of course this would be limited to the cast stuff. I think?

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    I'm No Expert Shaun's Avatar
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    Plenum Volume is what they were talking about and though increasing it would be benificial.

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    B1 Racing cs19's Avatar
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    Ive got a plastic type plenum spacer that the guy who makes my manifold made, not sure where you will find one for that Edelbrock tunnel ram though.

    I never ran a true test on the spacer, ran out of time, they do help on certain combinations but its not gonna set the world on fire.

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    Quote Originally Posted by Shaun View Post
    Plenum Volume is what they were talking about and though increasing it would be benificial.
    Cubic inches and rpm range have a lot to do with it as far as them helping to make power. They do isolate the carbs from heat, but the plenum volume is what they're talking about.

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    Quote Originally Posted by havasubyou View Post
    shaun, i made this from a 3/4 plywood for my victor ram, worked well on the 496 w/2 660's

    tried it on my 565 here with a single 1050 top and has a 4 hole shear plate on top, i made it...yes it looks bad but it ran well on the top end but low end just was not there with the carb being so far from the ports. but i tried.


    my single top, I paid to have a friend make it for fear that if I did it ...........
    and the red spacer is a shear plate. The engines a 565 too.
    Last edited by Sleeper CP; 08-22-2010 at 08:54 PM.

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    Cubic inch, rpm,cfm and VE come into play with plenum volume. Im guessing that your motor is fine with the small plenum than going bigger. Going bigger can hurt you more than smaller.

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    Quote Originally Posted by havasubyou View Post
    shaun, i made this from a 3/4 plywood for my victor ram, worked well on the 496 w/2 660's

    tried it on my 565 here with a single 1050 top and has a 4 hole shear plate on top, i made it...yes it looks bad but it ran well on the top end but low end just was not there with the carb being so far from the ports. but i tried.
    damn who welded up that intake top plate? Ray Charles?

  14. #12
    Senior Member cyclone's Avatar
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    Quote Originally Posted by Shaun View Post
    Plenum Volume is what they were talking about and though increasing it would be benificial.
    http://www.indplastic.com/

    this place is in anaheim, ca.
    give them inside and outside dimensions, radius size for the corners, and material type and they will make a program and cut it out for you. prices are very reasonable. They can do it out of delrin, abs, teflon, phenolic plastic etc.

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    I'm No Expert Shaun's Avatar
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    Quote Originally Posted by cs19 View Post
    they do help on certain combinations but its not gonna set the world on fire.
    No but might as well squeeze out every little bit you can

    Quote Originally Posted by cyclone View Post
    http://www.indplastic.com/

    this place is in anaheim, ca.
    give them inside and outside dimensions, radius size for the corners, and material type and they will make a program and cut it out for you. prices are very reasonable. They can do it out of delrin, abs, teflon, phenolic plastic etc.
    What is yours made out of, i really don't know much about those materials or which type would be best for something like that.

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    I remember a dyno test that involved a victor ram with, and without a
    1/2" spacer, although I don't remember what c.i. displacement the engine
    was. they were trying to help out the bottom/lower midrange torque tho...
    it did help substantially, being the type of manifold that it is-mini-plenum-
    you know what the advertised rpm range of that t-ram is kinda high, but
    the spacer helped extremely well for the application, which I believe was
    somewhere in your displacement range. think it was in HOT BOAT, I can look for the article if you want....

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