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An idea popped into my head and now I can't get it out.
Why has no one made side-draft-style individual runners that would bolt onto one of the high flowing TPI intake bases?
(Think of the TPI plenum removed and the runners straightened out and pointing right towards the top of the valve covers? and a nice taper all the way in)
Yea, the throttle bodies and linkage would be "fun" to build, and aftermarket EFI would pretty much be required, but so many benefits... -Different length swappable runners, heck you could terminate those runners into a split dual plenum intake setup and still use front-mount throttle bodies, too.
The coolest implementation would use a dynamically adjustable IR stack length like in THIS engine from Engine Masters a few years back; starts out @ 17.125" and as RPM increases the runner length decreases down to 13.625" as the RPM climbs.
Think THIS:
Meets this:
To end up with something kinda like this:
--But obviously the trumpets could be shorter and still get to the TPI's 19" runner length as they'd already have the lower intake runner length and would be attached at the exit and pointing up over the valve covers.
Or even a dual plenum config reminiscent of the Edelbrock cross-ram for LS engines:
The goal with that engine master's engine was to provide the broadest, flattest torque curve for max average power and a dynamic runner length side draft IR intake with as straight-as-possible runners and some good tri-Y headers sure would do that and have WAY better cylinder to cylinder air distribution and wet flow than a TPI AND the dynamic runner length magic means the thing would still make power upstairs.
Hey if your a fabricator with skills go for it I like the Edelbrock dual throttle body for the LS engines - looks good Hurricane Harrop that I saw years ago that I thought was sweet
for the effort it would take, just start with one of the cheap speedmaster cross ram intakes. you can buy throttle bodies for it that have the injector holes and fuel rail. they can be had in 54, and 58mm sizes. certainly not cheap. another option would be machining and welding the injector bungs into the intake like a traditional tpi base has, but then using a custom dual plenum with a pair of turbos. just use a crossover tube to tie the plenums together so you have a solid map signal.
I had a intake once someone used superram runners on a Accel tpi base and had individual throttle body’s on each of the runner openings. Unfortunately I don’t have any pictures of it.