Has anyone made a siamese porting job in a Superram? It can be completely siammesed from plenum to base. I thought I wouldn't do it with the setup I'm running right now, but with better heads/cam it sounds interesting. Anyone?

 

I dont think I'd do that. The only downside IMO of the SR is the size of the runners from the plenum to the base (and much more so in the base), I think the length is probably ok based on numerous dyno charts I've seen for them.

 

Yeah I wouldnt do it either. There was someone on the corvetteforum that tried that. And didnt have good results.

 

We will find out probably early next year. Hehehehe. One of our club members has just finished siamesing the runners on his Accel Superram. It will be on a 383 motor. He showed one of them at the last club meeting. Looked real good.

 

I would think it would screw up velocity pretty good. the SR runners are already what, a good 6 inches shorter than normal TPI runners?

 

I wouldn't think of the modding that way. They might be 6" shorter, but where does that leave an LT1 intake? The runners are way shorter than the SR if you include the lenght of the runners into the base. I think it might work on a stroked engine with good heads and cam. Too much for a 350 though.

 

[QUOTE=Firebreather;3108304]I wouldn't think of the modding that way. They might be 6" shorter, but where does that leave an LT1 intake?

Looking for the lost low/midrange torque i would think.

Ive seen several people swap out the superram for an LT1 intake. Gaining a few topend horepower but loosing alot of low midrange power. And end up going no faster. And having to rev the snot out of the motor to get the same acceleration. If i was looking for all out power anyways. I would be looking at a single plane intake, FI conversion type.

I looked into this having a 406, after reading one members results on the corvette forum. going no faster, even a little slower i beleive. I gave up on the idea.

I would think that if it was a good idea, John himself would have done it. He built serveral SuperRamed 406s. Most all ran ported SuperRams from what i read. Not siamesed.

I agree with madmax...the length is good just port the runner and base as much as you can. The base needs the most work even an aftermarket.

Just my thoughts...

 

Doing that to a superram may be the worst idea I've ever heard of. There would be little to be gained over doing that to SLP's since the runners have almost NO tuning effect once siamesed. You would still have the 6+ inch runner's in the base, just like you would with hogged out LTR's, but you would be paying hundreds more.

.....the ONLY thing I can see that it would have the benefit of is less heat soak. Other than that the SR is in my opinion the ideal EMISSIONS LEGAL street intake, especially when extrude honed. Honestly, in my opinion, I'd take it over a HSR or LT1 any day, but that's just me. If you were really going to do this, try siamesing just an inch at a time - then try it out. Don't totally mess up the runners and be left with nothing to work with....

 

You guys are probably right. A ported SR would be better. I smoothed out the base for a smoother transistion between the runners and the base. There's a lot of material to work with whenever I choose to fully port the whole intake.

 

I've only been exposed to the GM TPI engine for less than a year now and am attempting to soak in as much foundational info as I can.

I've just sent out my plenum and SLP runners to: Mike@corvetteplenum for his master megaport work and will dovetail those parts into an edelbroc intake base.

What I'm attemting to understand from your thread here is how siamesing takes away the 'Tune-Ability' of runners and Super Rams. (I am going through the SEARCH files to learn more about how siamesing affects torque,horsepower,etc...)

Could one of you take a quick moment and give me a basic understanding about the 'tune=ability' factor???? It would be greatly appreciated. Sincerely, Nitro

 

Intakes like these are 'tuned' to build more power at a certain RPM, based on runner length. There's a formula to vaguely determine that point if you're really interested in that sort of thing. I've heard some difference of opinion on exactly what point its from and to, but basically back of valve to the plenum is safe. When you siamese a pair of runners, you've sort of violated the rule because rather than the air coming back to a single large plenum, it comes back to one of 8 smaller plenums. Whether or not that remaining area is large enough to be considered a plenum is where the issue lies so at that point you kind of throw the book away and see what happens. Reason I think I wouldnt do it on a Superram is that the runner length, the typical TQ peak and typical HP peak for the intake makes it seem like a worthless idea since there's really no reason to raise those points, you just need to find a way to get more air in and the base is kind of restrictive by comparison.

 

that explaination helps, given the idea that the plenum is just an air storage device. I can get a visual picture in my mind with the stock plenum and siamesing the long tube runners.
If I carry that picture over to the Superram, does it stand that siamesing there also messes with the air 'vortex' as it moves towards the intake valves?
Nitro