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Old 08-17-2010, 08:42 AM
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Tunnel ram install

Bought a used intake. Its was installed on a show car some years ago and has been sold once and now in my hands. It was not installed on anything but the show car. It looks like it has never been fired or any fuel ran through it. My question is the angle of the top plenum. I just assumed that the rear of the intake would be taller than the front giving that normally the engine has a slight angle while sitting in the car and your intake has a slight angle on the top to balance it out allowing the carb to sit level. Am I wrong here, or could someone have put the top plenum on backwords?? also, there is a small threaded hole on the back of the top plenum. Is this correct and whats it used for?? Sorry, newbee here.

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Old 08-17-2010, 08:56 AM
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Some have a spacer plate angled underneth the carb that bolts to the plenum. The hole on top of plenum is a vacum port for power brakes and such I would imagine.
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Old 08-17-2010, 10:03 AM
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Some Tunnel Ram manifold are set up in an angle for the carbs because the motor sits on an angle. The rear part of the motor sits lower than the front. Giving an allusion The front carb is sitting higher then the rear and they are both the same level. If you install a spacer on the rear carb to level it off you will cause uneven fuel distribution.
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Old 08-17-2010, 12:47 PM
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So with the manifold sitting on the bench, when I measure the front where the carb will sit, it is higher than the spot where the rear carb will sit. Wouldnt it be the other way around seeing as most motors tilt to the back??
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Old 08-17-2010, 01:06 PM
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you can add spacer between the air cleaner for the rear carb.
Or use two air filters. Holley does sales seprate air filters. They triangle shape. Stay away from the bug eye sponge filter. It will dry and break away and get sucked in. If backfire it will catch on fire. There are T-rams that are set up flat instead of an angle for the carbs. If you lay the t-ram manifold on a flat surface they will be even only angled slightly foward.

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Old 08-17-2010, 01:17 PM
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Quote:
Originally Posted by bonechip67
So with the manifold sitting on the bench, when I measure the front where the carb will sit, it is higher than the spot where the rear carb will sit. Wouldnt it be the other way around seeing as most motors tilt to the back??
Could be that someone has put the top on backwards, if you could post a pic it would clear a lot of things up.
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Old 08-17-2010, 01:28 PM
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I was wondering if someone has but it on backwards.. I will try and post a pic when I get home from work. Thanks for all the input guys. Would much rather install it once and not have to tear it apart on the car.
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Old 08-17-2010, 01:55 PM
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In most applications, the rear carb will be a little higher than the front, due to the 'rake' of the engine in the vehicle.

On the TR top shown below, the orientation is obvious- it's made for a pair of spreadbore carbs- so the "front" and "rear" are easily discernible.

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Old 08-17-2010, 03:21 PM
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It is possible to put the plenum on backwards. Trust me I did it.
I have a Weiand T-ram (now removed for a 6-71 ) and shortly after I installed it I noticed that my "bug catcher" was tilted way up in the front.
Removed the plenum and turned it around and it was fine after that. So, yes it is possible. Just be careful because there is a gasket between the two, and you can't just run down to the local store and get one.

Mine doesn't have a hole drilled in it though. Maybe the PO tapped it for a vacuum source.
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Old 08-17-2010, 04:21 PM
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I will try and post the pics I just took. Looks like it is just over 9" in the rear and just over 9.5" in the front. Also note the threaded hole in the rear..
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Old 08-18-2010, 06:03 AM
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Prolly just a case of the custom vehicle's "posture" required the tilt of the top to be "backwards" from what is seen normally.

I would plug the hole in the top w/a polished or anodised flush-mounted plug of some sort and use another port for manifold vacuum for the brake booster, vac. modulator, etc.

If the gasket tears, run down to the parts store for a roll of FelPro gasket material to make a fresh gasket from.
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Old 08-18-2010, 07:09 AM
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Quote:
Originally Posted by cobalt327
If the gasket tears, run down to the parts store for a roll of FelPro gasket material to make a fresh gasket from.
yea, guess that would work too.
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Old 08-18-2010, 07:18 AM
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Beats using a pizza box top- which I did years ago for a Bultaco side cover gasket.
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Old 08-18-2010, 07:19 AM
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Quote:
Originally Posted by bonechip67
I will try and post the pics I just took. Looks like it is just over 9" in the rear and just over 9.5" in the front. Also note the threaded hole in the rear..
Yes there is an angle put into the intakes due to the auto manufacturers put approx 3* angle slope on engine placement. That intake looks like a holley hi ram #1984 http://www.holley.com/1984.asp can you confirm this?
You will notice the backside (distributor hole side) that the back carb mounting base is thicker then the front, hence to achive rake requirement. Also the intake manufacturers do make gaskets for between the top and base. If it is the holley you will see it listed in parts and kits on attached link.
That is a nice polish job on intake is that going in what looks like a 56 chev in background?
Steven
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Old 08-18-2010, 07:48 AM
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From Jegs:



Notice the way the top’s mounted? The intake is a Weiand… “just say why-and”, BTW. I guess Holley owns them now.

This is Summit's image:
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