{{{ TUNNEL RAM PORT MATCHING QUESTIONS ???? }}}
#771213
08/11/10 10:06 AM
08/11/10 10:06 AM
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Joined: Jul 2006
Posts: 9,366 Lehigh Acres, Florida
rickstershemi
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OK....My question is: the ports on my weiand 5995 tunnel ram going on the 408 with J-Heads are mucho smaller then the head ports.....the J-Heads match the Felpro 1213 gasket perfect. Should I leave the intake alone (ports are all within the head port perimeter) or should I port match them...????? Is having a smaller volume runner on the intake a plus...or will the step cause turbulence and kill power....????? This is just a mild 450hp street combo....should I just bolt it together as is....?????? Rickster
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Re: {{{ TUNNEL RAM PORT MATCHING QUESTIONS ???? }}}
[Re: rickstershemi]
#771217
08/11/10 10:51 AM
08/11/10 10:51 AM
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Joined: Mar 2005
Posts: 2,172 Ohio
theclutcher
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Why not try it as is? If you dont like it you can carve later. Usually match everything here but 2-4's and in you app, may be fine as is, may add torque. Also like stacks, made buy who?
Last edited by theclutcher; 08/11/10 10:52 AM.
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Re: {{{ TUNNEL RAM PORT MATCHING QUESTIONS ???? }}}
[Re: theclutcher]
#771218
08/11/10 12:23 PM
08/11/10 12:23 PM
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Joined: Jul 2006
Posts: 9,366 Lehigh Acres, Florida
rickstershemi
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Quote:
Why not try it as is? If you dont like it you can carve later. Usually match everything here but 2-4's and in you app, may be fine as is, may add torque. Also like stacks, made buy who?
Yeah I was wondering if the narrower runners might add to bottom end torque which I sure would like as much as possible....??????
My engine builder said leave'em alone...
The stacks are K&N's....really nice pieces and run about $70 a piece.
Rickster
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Re: {{{ TUNNEL RAM PORT MATCHING QUESTIONS ???? }}}
[Re: rickstershemi]
#771219
08/11/10 12:42 PM
08/11/10 12:42 PM
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Joined: Dec 2009
Posts: 1,074 detroit, mi
POS Dakota
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super stock
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detroit, mi
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The smaller runners are going to help with velocity and help make extra torque for ya. I agree with your engine builder's suggestion to leave them alone. If it were a case of the opposite with a cylinder head port that was smaller than the intake runner, then I would think you'd definitely have to do something. but not in this case. it might actually help ya.
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Re: {{{ TUNNEL RAM PORT MATCHING QUESTIONS ???? }}}
[Re: POS Dakota]
#771220
08/11/10 12:54 PM
08/11/10 12:54 PM
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Joined: Jul 2006
Posts: 9,366 Lehigh Acres, Florida
rickstershemi
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Quote:
The smaller runners are going to help with velocity and help make extra torque for ya.
I agree with your engine builder's suggestion to leave them alone.
If it were a case of the opposite with a cylinder head port that was smaller than the intake runner, then I would think you'd definitely have to do something. but not in this case. it might actually help ya.
That's what I thought with the smaller runners
Thanks, that saves me a ton of grinding
I do need to do a small amount of grinding to match-up the plenum top, but very minimal and will smooth out the casting seams and a few little slag here and there and shoot it out to be powder coated
Rickster
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Re: {{{ TUNNEL RAM PORT MATCHING QUESTIONS ???? }}}
[Re: theclutcher]
#771223
08/13/10 12:52 PM
08/13/10 12:52 PM
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Joined: Apr 2009
Posts: 190 Communist New York State, Comi...
We The People
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I gotta say.... why have large port heads, and a tunnel ram if your looking for tourqe??? I would think the mixture coming in would have a ton of turbulence coming out of the manifold and into a big void of a port, with that 90* edge of manifold left. It wont take long with a good carbide to at least blend it deep into the manifold for a smooth transition. keep in mind, your not going to open it up to and add a bunch of cc volume. I would just go for a smooth transition, as deep as you can reach. Think of the air going over a box truck in the winter time, with all that snow swirling behind it....doesn't seem good for areo. nice looking setup though good luck
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Re: {{{ TUNNEL RAM PORT MATCHING QUESTIONS ???? }}}
[Re: We The People]
#771224
08/13/10 01:43 PM
08/13/10 01:43 PM
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Joined: Aug 2003
Posts: 43,157 Bend,OR USA
Cab_Burge
I Win
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I Win
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Posts: 43,157
Bend,OR USA
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Quote:
I gotta say.... why have large port heads, and a tunnel ram if your looking for tourqe??? I would think the mixture coming in would have a ton of turbulence coming out of the manifold and into a big void of a port, with that 90* edge of manifold left. It wont take long with a good carbide to at least blend it deep into the manifold for a smooth transition. keep in mind, your not going to open it up to and add a bunch of cc volume. I would just go for a smooth transition, as deep as you can reach. Think of the air going over a box truck in the winter time, with all that snow swirling behind it....doesn't seem good for areo. nice looking setup though good luck
Actually the smaller intake port acts as a reversion dam, especially on the bigger overlap cams with tight lobe centers Same thing on the exhaust, you always want a bigger exhaust flange port size and pipe size than the heads port size to help stop reversion on the overlap the box truck example does not have a bigger diameter pipe behind it to funnel the airflow through it Venturi effect proves that fluids funnel down into a smaller size increase speed, reduces pressure within the column so there is no bad results at all by having the smaller size intake runner on top of the head intake port, if within reason on the two sizes
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: {{{ TUNNEL RAM PORT MATCHING QUESTIONS ???? }}}
[Re: Cab_Burge]
#771225
08/13/10 02:54 PM
08/13/10 02:54 PM
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Joined: Apr 2009
Posts: 190 Communist New York State, Comi...
We The People
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Ok, I get the reversion dam at part throttle situation. But at WOT I dont think there would be a lot of reversion pulses to worry about (isnt this the ram tuning for certain rpm that mopar played with). Thats why I questioned the tunnel ram and search for more "tourqe" instead of peak #. you dont see max wedge heads using standard size manifolds. (I know that is an extreme example) I would also be concerned that the mismatch isnt consistant on all runners, so if its good or bad it wont be the same every where for sure. Its always fun Questioning you Cab!!
Last edited by We The People; 08/13/10 02:57 PM.
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Re: {{{ TUNNEL RAM PORT MATCHING QUESTIONS ???? }}}
[Re: We The People]
#771226
08/13/10 03:15 PM
08/13/10 03:15 PM
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Joined: Jul 2006
Posts: 4,595 On the south side of Nowhere
S/ST 3040
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Unless this is a well scienced out combination, I don't see much advantage in "port matching" here. You can't make an OEM head too big for a 408" engine so, it's not like bolting a Torker to a B-1 head. With properly tuned carburetors, tunnel rams work better than most people think in street applications.
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