murrayarnold Posted August 12, 2019 Report Share Posted August 12, 2019 (edited) Well the conversion starts. I have opened up my box with the triple strombergs. Included was a strange looking thing. I assume as this all came from america its part of an anti smog thing. Think this will be seeing the bin. Photo attached. I drove the car back to the house and by the time i got home i was down to maybe 2 cylinders. The old webers are needing a recon i recon. Someone sugested to boil them in pure lemon juice. Hmm. May have to take some advice on that. I will do another topic on it. As for the initial view of the new set up. I may have to modify the inlet flange to fit with the after market exhaust flange. Also i will need to reinstate the water line that i blocked when installing the webers 10 years back. And the linkage. Hmm. That looks like i will need to think of something. Stay tuned. I will update on progress over the next week. Edited August 12, 2019 by murrayarnold Spelling Quote Link to post Share on other sites
JochemsTR Posted August 12, 2019 Report Share Posted August 12, 2019 For my understanding: you are going from Weber to Stromberg ??? Jochem Quote Link to post Share on other sites
Tim D. Posted August 12, 2019 Report Share Posted August 12, 2019 Black thing is a carbon canister. I had one sent to me with the supercharger. Tim Quote Link to post Share on other sites
Tom Fremont Posted August 12, 2019 Report Share Posted August 12, 2019 47 minutes ago, JochemsTR said: For my understanding: you are going from Weber to Stromberg ??? Jochem New one on me too . The Webers ought to fetch strong money; they're vintage Italians dating back to the '60s with brass throttle shafts. OTOH, they've got strange bolts on top so who knows what has befallen them... Tom Quote Link to post Share on other sites
murrayarnold Posted August 17, 2019 Author Report Share Posted August 17, 2019 Well as luck has it, its not straight forward. As with the webber manold i am going to have to butcher a good inlet manifold again. Why you ask. Its due to the after market exhaust. The flanges on the exhaust mean that i have to cut the flanges back. Its a damn nuisance but unavoidable. I have also ordered up new head studs and thin nuts to make the instalation easier. I have in addition taken about 6mm of all the studs on the carb side of the manifold. Again this maks instalation easier as i have had to seperate the carbs from the manifold. Quote Link to post Share on other sites
JochemsTR Posted August 18, 2019 Report Share Posted August 18, 2019 8 hours ago, murrayarnold said: Its due to the after market exhaust. I really do not want to change your thoughts and project scope, I am still dealing with the fact the exhaust flanges are causing this and making you change from Weber to triple stromberg. Correct? if so, how are the exhaust flanges causing any problems? Do you have any pictures you want to share.... Jochem Quote Link to post Share on other sites
Quicksilver Posted August 19, 2019 Report Share Posted August 19, 2019 (edited) Hi Murray, In the Netherlands there is also a guy who did the same. http://tr6.verweijfamily.nl/dokuwiki/doku.php?id=aanpassingen:triple_stromberg Sheers Marcel. Edited August 19, 2019 by Quicksilver photo Quote Link to post Share on other sites
murrayarnold Posted August 21, 2019 Author Report Share Posted August 21, 2019 On 8/18/2019 at 8:02 AM, JochemsTR said: I really do not want to change your thoughts and project scope, I am still dealing with the fact the exhaust flanges are causing this and making you change from Weber to triple stromberg. Correct? if so, how are the exhaust flanges causing any problems? Do you have any pictures you want to share.... Jochem The flange at the head on the aftermarket SS exhaust is bigger. The new inlet would fit with the standard exhaust manifold but not what i have. I had to cut down the webber manifild to get it to fit with the exhaust. It just is that way. Thats all. Quote Link to post Share on other sites
murrayarnold Posted August 21, 2019 Author Report Share Posted August 21, 2019 On 8/19/2019 at 11:51 PM, Quicksilver said: Hi Murray, In the Netherlands there is also a guy who did the same. http://tr6.verweijfamily.nl/dokuwiki/doku.php?id=aanpassingen:triple_stromberg Sheers Marcel. Thanks marcel. Quote Link to post Share on other sites
Harald Posted August 22, 2019 Report Share Posted August 22, 2019 That was several years on my TR6 until I changed it for EFI. Triple SU HIF44. Harald Quote Link to post Share on other sites
BlueTR3A-5EKT Posted August 22, 2019 Report Share Posted August 22, 2019 Just as an aside....which you probably already know. Check the inlet/exhaust gasket matches the inlet ports of the head and the new triple manifolds you have. Our 'across the pond' cousins had cylinder heads with narrower spaced inlet ports on all TR250 and half the TR6 models fitted with carbs. Cheers Peter W Quote Link to post Share on other sites
Harald Posted August 23, 2019 Report Share Posted August 23, 2019 Thanks for the hint. The supplier of these intake manifolds therefore has two different intake manifolds on offer. https://www.goodparts.com/product-category/engine/triple-stromberg-and-su-intake-manifolds/ Cheers Harald Quote Link to post Share on other sites
murrayarnold Posted August 23, 2019 Author Report Share Posted August 23, 2019 16 hours ago, Harald said: That was several years on my TR6 until I changed it for EFI. Triple SU HIF44. Harald How did the car run on the triple SUs. Quote Link to post Share on other sites
Peter Cobbold Posted August 24, 2019 Report Share Posted August 24, 2019 Let me guess: the middle SU runs richer than the other two Peter Quote Link to post Share on other sites
astontr6 Posted August 25, 2019 Report Share Posted August 25, 2019 19 hours ago, Peter Cobbold said: Let me guess: the middle SU runs richer than the other two Peter Hi all, How much extra performance do you get using 3 S/U or Strom carbs over 2 SU or 2 Strom carbs? Or does a lot of other work have had to have been done to the engine? Bruce Quote Link to post Share on other sites
Nigel Triumph Posted August 25, 2019 Report Share Posted August 25, 2019 (edited) Twin SU HS6 carbs will flow enough fuel/air for 150bhp or more. As a result, I would expect a Triumph 6 cylinder engine to require significant modification for any benefit to be found with triple SU or Stromberg carbs. And the uneven inlet pulsing through each of a 3 carb set up must have some gas flow penalty compared to twin carbs on a 6 cylinder engine. Nigel Edited August 25, 2019 by Nigel Triumph Typo Quote Link to post Share on other sites
stuart Posted August 25, 2019 Report Share Posted August 25, 2019 FWIW Jaguar 3.8ltr engines in MK2/S Types had 1 3/4" HS6`s fitted and good for 210HP (Obviously twin cam and cross flow helps) but they ran fine on two carb setups. Stuart. Quote Link to post Share on other sites
murrayarnold Posted August 25, 2019 Author Report Share Posted August 25, 2019 On 8/24/2019 at 3:39 PM, Peter Cobbold said: Let me guess: the middle SU runs richer than the other two Peter Thats only because of the servo vacum. To be honest the tr with vented/grooved brakes doesnt meed the servo which means no vacum to the carbs. Helps all 3 carbs run in sync. but hey, just my opinion. Quote Link to post Share on other sites
Peter Cobbold Posted August 25, 2019 Report Share Posted August 25, 2019 1 hour ago, murrayarnold said: Thats only because of the servo vacum. To be honest the tr with vented/grooved brakes doesnt meed the servo which means no vacum to the carbs. Helps all 3 carbs run in sync. but hey, just my opinion. Its because of the firing order: 153624 Looking at each carb in turn we heve open inlet valves in sequence 2*1*** 3**4** 5*6*** The centre carb has evenly spaced pulses while the outer carbs the second pulse soon follows the first, followed by a gap. Fuel flow is a tad better with even pulses. Thats why the triple SU Jag engines had a slightly leaner needle on the centre carb. Mind you the effect is small. Triple or twin?. The "constant depression" is what matters, so I'd evaluate carbs starting with measuring that. With twin carbs the spring, which is there to improve atomisaiton, can be removed as the manifold runners are symmetrical. Then compare piston masses and areas. to get a measure of the CD............... Peter Quote Link to post Share on other sites
murrayarnold Posted August 26, 2019 Author Report Share Posted August 26, 2019 Bloody hell. That a science project right there. I take my hat of to you and with no measure of mocking. I am very happy to be schooled. In another not regarding the carbs i have. The throttle linkage i have on them looks luke a heavy bugger located under the carbs. Is there any other option? Quote Link to post Share on other sites
Peter Cobbold Posted August 26, 2019 Report Share Posted August 26, 2019 10 hours ago, murrayarnold said: Bloody hell. That a science project right there. I take my hat of to you and with no measure of mocking. I am very happy to be schooled. In another not regarding the carbs i have. The throttle linkage i have on them looks luke a heavy bugger located under the carbs. Is there any other option? Dunno, I only have one SU to worry about ! Quote Link to post Share on other sites
poolboy Posted September 13, 2019 Report Share Posted September 13, 2019 On 8/25/2019 at 3:08 AM, astontr6 said: Hi all, How much extra performance do you get using 3 S/U or Strom carbs over 2 SU or 2 Strom carbs? Or does a lot of other work have had to have been done to the engine? Bruce I once had triple ZS carbs on a basically stock TR6 engine...the cylinder head has some porting...Same engine with dual ZS carbs now. Seems to me if I were already going fast, going a little faster took less time with the triples than with the duals. Quote Link to post Share on other sites
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