Weber IDFs - Anyone Run Them?

[James]

Admittedly, my carb experience is pretty limited, but I woke up this morning thinking about triple Weber IDFs. Will someone tell me why these aren't used on our cars, or if they are, great? They seem pretty readily available, and might work better clearance-wise, at least with the brake booster. Perhaps not so much with the hood. Are DCOEs simply better/more efficient?

I haven't found much on the interwebs except for a short video of an e30 with them installed; no underhood shots, though. I have yet to bother my (far more intelligent) resources via telephone, so figured I'd throw it at you guys first.

Thoughts?

James

 

[jmackro]

IDF's are basically d0wndraft DCOE's. So sure, if you could come up with a manifold, I suppose you could run 3xIDF's, just as people run 3xDCOE's. The challenge is finding/making that manifold.

Since the stock carburetors on an e9 are downdrafts, I'd guess there would be enough space beneath the hood to fit the IDF downdrafts plus air filters. IDF packaging on an e9/e3 might be cleaner than a DCOE installation, as the rear carb/air cleaner wouldn't interfere with the brake booster.

 

[James]

IDF's are basically d0wndraft DCOE's. So sure, if you could come up with a manifold, I suppose you could run 3xIDF's, just as people run 3xDCOE's. The challenge is finding/making that manifold.

Since the stock carburetion on an e9 is a downdraft, I'd guess there would be enough space beneath the hood to fit the downdraft carburetors plus air filters. IDF packaging on an e9/e3 might be cleaner than a DCOE installation, as the rear carb/air cleaner wouldn't interfere with the brake booster.

This is what I was thinking. Maybe I'll call Pierce manifolds. I wonder if one could modify Porsche manifolds to make it work. I have no idea what the spacing is like or the angle, but the Pierce 912 adapters look interesting.