Re: One companies modified tunnel ram for the street..$$
[Re: 67Satty]
#2735631
01/22/20 03:46 PM
01/22/20 03:46 PM
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Joined: Oct 2005
Posts: 9,038 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 9,038
Ontario, Canada
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but why do we need a new top for a tunnel ram? Did you not notice the lack of a common plenum ?
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Re: One companies modified tunnel ram for the street..$$
[Re: Stanton]
#2735636
01/22/20 04:05 PM
01/22/20 04:05 PM
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Joined: Jul 2003
Posts: 4,831 Holland MI Ottawa
2boltmain
OP
master
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OP
master
Joined: Jul 2003
Posts: 4,831
Holland MI Ottawa
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but why do we need a new top for a tunnel ram? Did you not notice the lack of a common plenum ? From what I did read evidently having dedicated plenums improves low end. All good but that price! Knocking on new six pack induction cost.
Keep old mopars alive.
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Re: One companies modified tunnel ram for the street..$$
[Re: 2boltmain]
#2735672
01/22/20 07:59 PM
01/22/20 07:59 PM
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Joined: Aug 2003
Posts: 43,741 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,741
Bend,OR USA
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Individual runner tunnel rams where popular in Pro Stock for a short while in the 1970s on BB Chevy, Fords and Hemi motors This add is for SB Chevy, correct? Including two new carbs, linkage and new special cast aluminum IR manifold at the retail price is probably not a bad deal I've converted more than one in line dual quad set ups on both 360 degree intakes and dual plane intake to one to one linkage to make then run better, way better on the early hemi motors and wedge motors with the dual quad single plane intakes I've never ran or race a IR tunnel ram motor so no hands on experience in tuning them or driving them
Last edited by Cab_Burge; 01/22/20 08:02 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: One companies modified tunnel ram for the street..$$
[Re: 2boltmain]
#2735794
01/23/20 10:28 AM
01/23/20 10:28 AM
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Joined: Jan 2003
Posts: 4,395 The Pale Blue Dot
Skeptic
master
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master
Joined: Jan 2003
Posts: 4,395
The Pale Blue Dot
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That's really old, and only for SBC motors. As far as the Weiand tunnel rams, I've got 2 for a low deck- they look different externally, but the mis-match between the top and base is damn near the same, There's an article on HR ... We looked it over out-of-the-box and decided it needed porting. The runners neck down in height at about the midpoint from the cylinder-head side, then transition to a large cross-section "D" shape at the plenum. We performed considerable porting, carefully measuring the point of minimum cross-sectional area and removing metal in that area. Access to any part of the runners is wide open for porting, with the top plenum removed. Later, we found this note on the Weiand Hi Ram in a Mopar Performance race manual, "For best performance, the Weiand ram should be ported out to the size of the port in the head." Current link, since HR broke all the old ones The manifold shootout was on a 383, what's not clear is if that is the ported manifold Steve Dulcich used in the older build, or another one he picked up later.
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