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Running Strong at last.
Friday I went down to the dyno shop armed with a new coil, NGK BP7ES plugs gapped 0.025", and my ridiculous armament of idle and main jets and air correctors. Had calculated where to go next with jetting based on the previous too-rich guess.
The old coil was oiled pretty badly, I think from its own oil. Ignition break-up was cured after coil and new plugs. Also installed the next jet setup. But after a bit the car would barely run, then not at all. Pulled the top of the carb to see what bonehead thing I'd done. Couldn't find any. Fuel in bowl very low. Tried running the pump with the hose off the carb. None. One of the lads crawls under and finds a kinked fuel hose! Unkink, now fuel shoots across the engine compartment when pump is activated. Great. Put back together, run again, now it runs but can't get very far on heavy throttle before apparent fuel starvation. Hmm. Getting very late, the shop guys are anxious to head out for the holiday weekend (Memorial Day in the US). So I tell them I'll take it and try to sort it this weekend. This morning I inspect the float valve first. Beautiful, and matching the flow of the new one I've got based on blowing through them. Inspect fuel system further, find a partially kinked line at the pump inlet. Suspect that under the suction of the pump this kink is collapsing hard and letting only a small amount of fuel through. Lucky I made it the few miles home from the shop without destroying the pump from lack of cooling. Drove very gently to keep her going.
So I bought brass fittings and made a brass 180-degree bend. There's not much space on the subframe once you get a tee fitting, return line, electric fuel pump, and filter. After fitting the brass, the car runs like a dream, at least compared to where it was. Couple hiccups here and there, but running strong. And loud! Will definitely have to fit a muffler. Goosed the throttle wide open a couple times and saw 8psi on the boost gauge. 16" of Mercury vacuum at idle.
Now to get it back on the dyno for final fuel curve sorting and to see the power curve. With the problems in previous sessions, never saw boosted power above natural aspirated. Natural was 46HP, 59lb-ft at the wheels. Road Apples & Rotini?
A few pictures of the mostly-finished product:
Rear View. Things hang down much less than it appears, very similar to the RC40 back box from before. Went over some fairly ugly speed bumps today with no scraping.
Up-Pipe. This is the boost pipe seen from the front of the transmission case. The welder wound up going around the tranny, across the front, up between the alternator and distributor, then around the engine and back to the hat. Finless front-mount intercooler!
Engine Bay view showing boost pipe routing after coming up through the grille
Aeromotive fuel pressure regulator. No gauge yet
Sort-of Close-up of the carb
Wound up disabling the choke because the passage for the linkage created a sizable boost leak. I have a new DGV which uses a cable with a nice seal for the choke, will fit that one later. It is a weird one, looks much different than the ones in the Weber book and the air correctors and idle jets are way different.
Edited by fortfun on 29th May, 2006.
1275 with Back Door Turbo
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