Slalom4me what do you mean? I know bigger isnt always better, but better heads and a cam means you have to get more air in out?

 

I am just a dumb heavy equipment mechanic so I don't know what rhetorical means, but in a nutshell...bigger runner diameter/shorter runner length = hp peak shifted higher into the rpm range.

If you're lucky, and portwork is done right, you gain some higher rpm horsepower without giving away much low/mid rpm torque. Well ported TPI intakes "should" extend that dreaded TPI "wall" beyond that 4500 rpm mark. Mine seems to do it as I predicted it would. For someone like myself who didn't want a high rpm screamer, that is a great option even though some people still look down at it. On a daily driver type car, I'll trade BROAD USEABLE POWER for little used top end HP anyday...That's the exact reason I used small runner (but high velocity) heads, stock cam w/1.6's, small tube headers, tpi intake, etc...

 

I have read that before (I think) I have it all apart right now and I have a complete running unit, but im haveing a bad case of while im at!! Yea its a daily driver and its not a race car! I dont what I should do? put it back together? My original thought was port the plenum, and throttle body. Thats what got me thinking about runners and a manifold. All I read says they dont flow enough air but Im not looking to build a rpm screamer

 

Runner length plays a significant part in determining the RPM range in
which an intake performs well for a given package of components.

A lot of information is available on the subject - here is a quick primer.

In addition to the alternative of changing or modifying components
that make up the existing OEM TPI, there are other intake choices to
consider which address the issue of runner length.

In order of decreasing runner length there are the
- Accel/Lingenfelter Super Ram (aka SR)
- Holley Stealth Ram (aka HSR)
- Single Plane converted to EFI (aka SP)
- TPiS MiniRam (aka MR)
- Converted LT1 intake

Each choice has benefits and drawbacks. They have all been discussed
extensively in this forum (and others). The 'Advanced Search' tool
with the Archive flag set will bring forth hours of reading pleasure.

Currently, the SR appears to be temporarily out of production until
further notice, used ones become available from time to time.

The HSR works well but does not fit under a stock hood. Custom
plenums that permit the hood to close have been tried, but never
with unqualified success. A hood scoop or raised hood will permit
the HSR to function in a C4 as Holley intended.

The SP requires a custom plenum/elbow in addition to the EFI conversion
of adding fuel injector bungs and so on to the manifold. At least
two or three CF members have chosen this route.

The MR has runners that are short enough that the torque characteristics
of the L98 are lowered and the RPM range elevated noticably. Manual
trans owners enjoy them, auto owners are not quite as convinced.
I do not have one and can only go by the discussions from back in
the day when SR vs MR threads used to be common.

The converted LT1 requires a manifold, the resources to convert it
and then the means to adapt it to a non-reverse flow engine. I
believe it is otherwise similar in characteristics to the MR.

.

 

A rhetorical question is one for which an answer is not expected.
With the focus on runner diameter, some consideration about the
other aspects of intake tuning seemed due.

In some ways, the question is pointless because the alternatives
to runner/base changes & porting the OEM components are no longer
readily available or are too expensive relative to the overall vehicle
to really be viable alternatives.

But it doesn't hurt to consider the aspects of diameter, length and
plenum volume along with the intakes that were developed to optimize
them.

No put-down intended to anyone.

.

 

Well I do agree! Thanks for the education! some thing are best left untouched, However I still might try to get the edelbrock for the right $$$. and go from there

 

can u bhelp

 

Hey Bob, ain't no apologies necessary. If I'd read your post accurately, I'd have realized which ones ya meant.
THose SLP's sure do give you some 'MEAT' to chew on though.
We all want the same thing anything.
MORE POWER and MORE MONEY, LOL.
Oh let's don't forget MORE TIME to enjoy our toys.