unclepete Posted September 25, 2020 Report Share Posted September 25, 2020 I am embarking on the rocky road of installing Triple Webers on my US TR6. So far I have the Weber DCOE40s, Bastuck Inlet Manifold and Exhaust Extractor Manifold. I have also read a huge amount of contributions on this Forum (many thanks). However one thing I cannot find is, what to do with the Original Carburettor Manifold Heater Pipe? Shall I Plug it or put in a bypass pipe? Also, looking at the Kieth Franck white paper on tuning Webers, I did not realise how critical, setting up the fuel level is! His method of removing the main jets and putting in an optical fuel level gauge, while the car is running, seems very risky, anybody tried it? would you not get an accurate measurement while the engine is not running? Quote Link to post Share on other sites
foster461 Posted September 25, 2020 Report Share Posted September 25, 2020 I think what I did is pretty typical. I blocked the port in the thermostat housing with another temp sender (I recently learned that a spark plug also fits... ) And I used a PI version of the solid line from the water pump housing to the heater. The PI version does not have the extra T in it. Stan Quote Link to post Share on other sites
foster461 Posted September 25, 2020 Report Share Posted September 25, 2020 Re the fuel level, you are correct that this is critical and you need to start there or everything else will get thrown off. I have never set float height with the engine running but I also dont have one of those sighting gizmos. Tom Fremont does though. Stan Quote Link to post Share on other sites
Oddball Posted September 26, 2020 Report Share Posted September 26, 2020 You can measure the height quite safety with the engine running. All you are doing is removing the jet cover and extracting one of the main jets. As the main jet is not being used at idle this has no effect on the engine idling. You can then measure the distance from the top of the hole for the main jet to the petrol surface with a micrometer and a torch. Should be 25mm +/- 1mm, however mine run best around 28mm. If your running an electric fuel pump you can just remove a main jet from the three carbs, turn on the ignition so the pump tops up the fuel, then switch of the ignition and measure the height. Quote Link to post Share on other sites
unclepete Posted October 4, 2020 Author Report Share Posted October 4, 2020 Thanks Guys, I haven't run her up as yet and am going to operate on the mechanical fuel pump to start with. I can pump fuel into the carbs manually and check fuel level without the engine running, see how that goes and then check it when (if) I get it running. I'll keep you posted on how that compares. Quote Link to post Share on other sites
unclepete Posted November 4, 2020 Author Report Share Posted November 4, 2020 Update I wish I had bought new carbs! I cleaned the starter valves but mixed them up without realising how critical it is to keep them to their original orifices. Had 2 of the little s**s leaking fuel - on different carbs! As I have capped of the choke mechanisms, I made up some PTFE rings to seal the starter valves off. Now running much better and am now able to get the slow running mixture close enough to get me to a rolling road. The tickover is very high and the best I've achieved is about 1200rpm! The electronic ignition is set at tickover at 4deg ATDC set with a strobe. With an extractor manifold and triple webers on a Bastuck inlet manifold, I think I've changed the characteristics of the engine enough to experiment with the Ignition Timing. Any ideas out there? Quote Link to post Share on other sites
YankeeTR5 Posted November 5, 2020 Report Share Posted November 5, 2020 Vacuum leak somewhere? Quote Link to post Share on other sites
ntc Posted November 5, 2020 Report Share Posted November 5, 2020 On 11/4/2020 at 10:15 PM, unclepete said: Update I wish I had bought new carbs! I cleaned the starter valves but mixed them up without realising how critical it is to keep them to their original orifices. Had 2 of the little s**s leaking fuel - on different carbs! As I have capped of the choke mechanisms, I made up some PTFE rings to seal the starter valves off. Now running much better and am now able to get the slow running mixture close enough to get me to a rolling road. The tickover is very high and the best I've achieved is about 1200rpm! The electronic ignition is set at tickover at 4deg ATDC set with a strobe. With an extractor manifold and triple webers on a Bastuck inlet manifold, I think I've changed the characteristics of the engine enough to experiment with the Ignition Timing. Any ideas out there? 4atdc ??? Should be 11btdc Quote Link to post Share on other sites
roy53 Posted November 6, 2020 Report Share Posted November 6, 2020 30 at 5000 rpm Pete i had problems with the Bastuck manifold. More manufacturing issues . Also the 3 connecting rods were poor /useless /****. Cannot help with the jetting as i have 3 x 45s and full race engine. Im near by so could pop around to cast an eye over yours or you come here. Keeping 2m apart of corse Roy Quote Link to post Share on other sites
unclepete Posted November 11, 2020 Author Report Share Posted November 11, 2020 On 11/5/2020 at 11:09 PM, ntc said: 4atdc ??? Should be 11btdc Yes you are correct 11 BTDC for Static timing - 4 deg ATDC is at tick-over with Advance Retard vacuum tube removed. Quote Link to post Share on other sites
unclepete Posted November 11, 2020 Author Report Share Posted November 11, 2020 On 9/25/2020 at 11:57 PM, foster461 said: Re the fuel level, you are correct that this is critical and you need to start there or everything else will get thrown off. I have never set float height with the engine running but I also dont have one of those sighting gizmos. Tom Fremont does though. I have set the fuel level height using a clear plastic tube from a WD40 tin! Take out the main jet, drop in the tube and mark the tube at shoulder of the carb, lick finger and stick over end of tube, lift out carefully and see the fuel level, mark before you take your finger off and measure - Simples! Quote Link to post Share on other sites
unclepete Posted November 12, 2020 Author Report Share Posted November 12, 2020 On 11/6/2020 at 10:17 AM, roy53 said: Im near by so could pop around to cast an eye over yours or you come here. Keeping 2m apart of corse Roy Have PMd you. Quote Link to post Share on other sites
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