Tyrone Posted October 15, 2006 Share Posted October 15, 2006 My carbs currently have 35mm chokes and F11 emulsion tubes in them which are fine for a race engine but not much cop for bimbling round town. Can someone confirm your entire carb spec, thanks. I'm running a Megajolt and a TPS with it. Link to comment Share on other sites More sharing options...
allen Posted October 15, 2006 Share Posted October 15, 2006 Not a great help, but my 1800 zetec is running very happily on the 40 DCOEs previously fitted to a 1760 crossflow - mind you, the 3d mapped ignition probably hides any slight miss match. AFAIK carnb jets are standard for 1760. Edited by - allen on 15 Oct 2006 22:15:23 Link to comment Share on other sites More sharing options...
Tyrone Posted October 16, 2006 Author Share Posted October 16, 2006 Unfortunately I sold the carbs off my Supersprint crossflow since the Zetec came with carbs which I had assumed were respec'd to suit. They were, but for extreme ragging, no venturi created below 4000rpm apparently. Help! Link to comment Share on other sites More sharing options...
MikeK Posted October 16, 2006 Share Posted October 16, 2006 I went from 32mm to 36mm chokes and got a big hole in the mid-range (a lot more than I expected). Good top end power though. It is going into Aldon for 34mm chokes to be fitted next week with re-jet to suit. I can let you know what is fitted if required. MikeK PS- Mt car runs on Dellortos. Not sure if this matters. Link to comment Share on other sites More sharing options...
Tyrone Posted October 17, 2006 Author Share Posted October 17, 2006 Thanks Mike but 'Oilyhands' has come through with the following: 32mm chokes 130 main jets F9/F16 emulsion tubes 180 air correctors 45f9 or 50f9 idle jets Link to comment Share on other sites More sharing options...
duffym Posted October 17, 2006 Share Posted October 17, 2006 Bri didnt see this yesterday as i was busy! Those settings sound like mine but i can have a look for you. Link to comment Share on other sites More sharing options...
MikeK Posted October 17, 2006 Share Posted October 17, 2006 Hmm. 32mm chokes. I still have my 32mm chokes. I have been in half a mind whether to get them re-fitted as opposed to fitting 34mm chokes, which was the compromise solution I was aiming at (I have missed the low/mid-range torque since the 32mm chokes were replaced). In case your interested, by dyno plots are here. MikeK Link to comment Share on other sites More sharing options...
oilyhands Posted October 17, 2006 Share Posted October 17, 2006 32mm chokes will give the best compromise of top end power and mid range pull, 34mm chokes may give a bit more at the top but you will need to go from 130 mains to 135 or 140 and *maybe* come down a size on the air corrector jet. Oily Link to comment Share on other sites More sharing options...
Tyrone Posted October 18, 2006 Author Share Posted October 18, 2006 I got the impression (might be wrong) that the 35mm choke sizes would make it difficult to get the fuelling right to avoid it running so rich at normal road speeds. Mike, would you be interested in selling the 32mm chokes? Link to comment Share on other sites More sharing options...
MikeK Posted October 18, 2006 Share Posted October 18, 2006 The fuel consumption certainly dropped when I had the 36mm chokes fitted (for the same road speed on average). Taking on-board Oily's comments (thanks Oily), I think I am going to downgrade(?) and refit the 32mm chokes. So they're not for sale I'm afraid. Apologies for the hi-jack but thanks for the thread; it has been useful for me. MikeK Link to comment Share on other sites More sharing options...
Tyrone Posted October 18, 2006 Author Share Posted October 18, 2006 Mike, no hijack there at all, the whole point of techtalk is to maintain a dialogue on the subjects close to your heart. That's why we shouldn't lock the techtalk threads. No worries on the chokes either. I'll post when I get the results of my RR session. Link to comment Share on other sites More sharing options...
Molecular--Bob Posted October 18, 2006 Share Posted October 18, 2006 Someone is selling a set of 34mm chokes on Ebay if you want to try them, saw them when i was looking for jets and refurb kits. item number 300038996250 Link to comment Share on other sites More sharing options...
Tyrone Posted October 18, 2006 Author Share Posted October 18, 2006 Thanks for the heads up Bob. Link to comment Share on other sites More sharing options...
duffym Posted October 18, 2006 Share Posted October 18, 2006 still too big though i think Link to comment Share on other sites More sharing options...
Tyrone Posted October 18, 2006 Author Share Posted October 18, 2006 Mark Hardy suggested 34mm, you're just scared 😬 Link to comment Share on other sites More sharing options...
MikeK Posted October 18, 2006 Share Posted October 18, 2006 Is your engine standard spec? My Zetec has a fast road cam and Ammo porting- no idea whether this exacerbates the effects of different choke sizes!? It would certainly be interesting to compare results. MikeK Link to comment Share on other sites More sharing options...
duffym Posted October 18, 2006 Share Posted October 18, 2006 I dont know what is in my engine but we all know size matters 😬 I think you would get more torque with smaller chokes and maybe slightly less top end. I'll have a look at mine when I have the chance. Link to comment Share on other sites More sharing options...
Tyrone Posted October 18, 2006 Author Share Posted October 18, 2006 I figured the 34mm were worth a punt on Ebay, we'll see. Mike the head and cams are standard. We think the 35mm chokes were used to get as much as possible out of the 40's which may have been a limitation of the race series. Link to comment Share on other sites More sharing options...
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