Mudder

Thank you so much to everybody who chimed in. Still trying to find a cost effective AFR logger. The Innovates are kind of up there. well, it will be a worthwhile investment.

Removed!

I temporarily plumped a fuel pressure tester right after the fuel pump and my mechanical out put is 3 psi, revving it to 2000-4000 RPM With the Holley regulator in line my pressures are bouncing between 2 and 3 psi in the same Rev. range The regulator is a Holley 12-804 . It's difficult to get ethanol free gas around here. 91Octane comes as E10. I am at high altitude (8000ft) and I will try to jet it down a bit. Thanks!!

I talked to Innovate and they couldn't tell me where to install the AFR sensor on my 4/1 no cat setup. The Tech Guy was worried about wrong readings. I'll try Performance Electronics next.

Well, 1. revving the warm engine at idle creates black puffs out of the exhaust 2. gas mileage went down to about 15mpg from 20 mpg 3. very black spark plugs 4. fuel droplets on my right clamshell Funny enough it runs fairly well, no real flat spots. 2-3000 rpm, putzing through 30 mph zones it becomes a little erratic. I pulled the floats (plastic, about 19grams each) and reset the height to 13mm and travel to 25mm (measured in the middle of the flat side) I was surprised to see some marring on the needles (1.75, 3000 miles) I synchronized the carbs a couple of days ago and my idle screws are about 2-2.5 turns out. New needle valves (1.75) are on order. Pierce Manifolds recommended a 60 F8 idle jet and I will install a Malossi Fuel pump and regulator. The Holley regulator I installed 2 years ago is inconsistent (measured by my fuel pressure tester) Carb Setup: 40 DCOE 151 (Spanish), new from Pierce Manifolds: Mechanical Fuel pump (very consistent 3 psi out put) Choke 32mm Idle Jet 50 F9 Emulsion T. F11 Main Jet 120 Pump Jet .45 Needle Valve 1.75 Air Corr. 170 Cheers

Dear Seveners, I've been tinkering with my 40DCOE's for quite a while and I think I am getting quite good at it. However I would like to get a little more analytical in regard to AFRs. I am running a stock 1700 Super Sprint. My compressions are excellent and the engine is timed properly. I optimized my 123 Ignition on a rolling road and both of my DCOE's are new (40 DCOE 151). The engine pulls pretty well, but at my elevation of 8000 ft, I would like to tweak the carbs based on proper AFRs. Does anybody in our group have experience with installing an AFR sensor in a classic dual Weber, 4 in 1, no cat setup. Essentially I am running four small 425cc engines which can all be tweaked individually ;-). A single sensor wouldn't really work IMO. Please fire away! Cheers Wolfgang

Congratulations! Nice find. The "Twin Cam" looks awesome. I own a 1999 S3 " Life Axle", 1700 Super Sprint. The original owner's son, sadly his Dad had passed, couldn't provide much info. However, Martin Phipps (Martin.Phipps@caterham.com) , the Caterham Archivist, was able to provide all the detail I could have ever asked for. He might not be able to shine any light on your engine installation, but he would know pretty much everything else. Original order, spec sheet, where the car was delivered to, etc. etc. I hope this helps. Cheers Wolfgang

MV8, Thanks for all your great advice. I need to find a shop which can do some custom work on the ex-manifold. I’ll check with Josh.

My setup is completely different. see attached pictures. The real trouble makers are no3 and no4 down pipes, but no2 could ply a role, too. Very annoying! I hate to rig things, but….

Most probably. It took a little coaxing on the new ones.

MV8, Thanks for your input and kind offer. I am a little bit between a rock and a hard place here. Any which way I move things, there will be interference. The steering column has about .5mm wiggle room. I showed it to Josh Robbin’s the other day and even he scratched his head. IMO there are 3 options. 1. Build new headers. That’s my least favorite. 2. “Malletize” the pipes in the problem area. 3. Design a new lower steering column. Retain the attachment points but go slightly smaller diameter with tubing instead of solid stock. Please let me know your thoughts.

New Engine mounts are in. It took a little wiggling. I loosened all main bolts (3) including the transmission (T9) and jacked the engine up slightly. The new rubber mounts slid right in. The tranny mount hasn't arrived yet. The new mounts appear to be a little beefier. Then on the other side, the 25 year old ones might have settled a bit. (the new one is the one on the right)

New rubber mounts are ordered for tranny and motor. I'll report back.

Great idea! Thank you.

Thanks to everybody. I have a new set of rubber mounts on order. Will report back.