EFI injector adapters

[sigchuck]

Hi guys, I ran across a guy on eBay that makes some very cool machines parts for air cooled 911s. One of his products is a set of injector adapters for MFI motors that allows use of a 3.2 or 3.6 fuel rail. He mentions CIS in the listing, but the pictures and thread size (M12x1.5) are MFI - I think the 930 injector thread size is a bit smaller, but not sure what it is.

Has anyone attempted this with 930 CIS injector blocks? I have no doubt TK blocks are likely the gold standard for using a 930 manifold, but this solution seems potentially like a much cheaper cost of entry. Assuming it is even possible, would fuel atomization, delivery, etc. suffer significantly for an engine that’s not highly modified?

Thanks, and here’s a link to the adapters. https://www.ebay.com/itm/374549401028?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=t2r5rtxnrwo&sssrc=4429486&ssuid=D5TuGGlbRyy&var=&widget_ver=artemis&media=COPY

[RSR Racer]

Having just made the switch to EFI using Turbokraft's injector blocks and fuel rails I would not go with anything else. Quality is fantastic, no air or fuel leaks, it fit perfectly, and you don't need wire ties to hold the injector adapters.

Worth the cost IMO. Can't beat the way it looks either!:

[LeeS930]

Here are a couple pictures of the PWR injector blocks. With a good EFI tune these blocks and the factory pancake intake work amazingly well for my build.

[dos531]

Goingsuperfast also sells a kit with rails and everything for a reasonable price. I used it before i went to a 3.2 manifold.
https://www.goingsuperfast.com/EFI-930-Turbo.html

[proffighter]

It looks like a smart solution at the first sight, but I think the price is a bit high and I have the same doubts about the position of the injector that far away from inlet port.

Even if they would work and fit nice, you still have the weak point of old brittle OEM phenolic (or what do you call in english) blocks. When you count all to cost for conversion, it may be only a little save there. But It looks smart at least

[TurboKraft]

That looks like a decent solution for the non-turbo MFI engine, but not for the 930.
And it requires 964 fuel rails -- very expensive new from dealerships, but fortunately there are many leftovers from the engines Singer uses as cores.
(But many of those are now requiring re-finishing because of corrosion, and they have metric fittings, so there's those additional expenses.)

Roland is 100% on point: the stock injector blocks cracked in normal use, and don't improve as you extract more power from the engine.

Additionally, the injector angle -- which wasn't a problem for CIS injectors that spray a gas "cloud" -- is hardly ideal for an EFI injector that sprays in a 15-35deg cone.

Which is just one of the (many) issues with the GSF injector blocks: low speed driveability is compromised when a good porting of that injector spray cone is aimed at the port wall.

The PWR blocks were made by MODE and are discontinued. They were nicely made, other than the insulators that were prone to warping and leaking. This shortcoming is the reason we designed our insulators to interlock with the EFI injector block so they could not develop a leak.

In the scheme of the total EFI conversion, the cost of our thoughtfully engineered and well made EFI Injector Blocks package part is a very small expense.