ratta tat tat
Supporter
- Total Posts : 1633
- Scores: 39
- Reward points: 5492
- Joined: 2011/08/01 11:02:49
- Location: Brisbane
- Status: offline
DCOE jetting for Kent 1600
Hey fellas,
Can someone please offer me some advice for re jetting my single DCOE 40 weber?
I have it on a standard low compression 711M motor and it runs great. Specs are 65 starter, 35 pump, 45F9 idle, 40ex, 200 air, 130 main, 32 choke.
Now I want to put a different engine in the escort. High compression 711M with a 234 cam. What changes need to be made to my weber? Cheers
|
ratta tat tat
Supporter
- Total Posts : 1633
- Scores: 39
- Reward points: 5492
- Joined: 2011/08/01 11:02:49
- Location: Brisbane
- Status: offline
Re:DCOE jetting for Kent 1600
2012/05/08 21:40:20
(permalink)
Bump. The motor is in and is running great. It has heaps more power, chirping around corners in 2nd  I think I can squeeze a bit more from it with better jetting. I'm sure the idle could go one richer. Daniel from weber performance thinks a 150 main would be too big, 140 being better. Any suggestions from the forum? Thanks
|
Matt75
Deity
- Total Posts : 2184
- Scores: 67
- Reward points: 5609
- Joined: 2011/08/01 11:02:49
- Location: Doncaster Vic Australia
- Status: offline
Re:DCOE jetting for Kent 1600
2012/05/09 08:54:45
(permalink)
You probably won't really know or get it spot on unless you get it on a dyno.
Then you can throw in lots of jets etc.. to get the best out of it.
Otherwise you are sort of just taking an educated guess.
Cheers
Matt
|
ratta tat tat
Supporter
- Total Posts : 1633
- Scores: 39
- Reward points: 5492
- Joined: 2011/08/01 11:02:49
- Location: Brisbane
- Status: offline
Re:DCOE jetting for Kent 1600
2012/05/09 19:57:54
(permalink)
After making this post I sat down and read my haynes weber manual purchased a while back. It was a pleasant surprise to find an appendix in the back showing the exact carbs and set up for many weber conversions.
e.g 1275 mini cooper S: 45DCOE13 (1) 38 choke 5.00 1.60 F16 1.70 0.45F9 0.50 1.00 2.25
It did have 1600xflow cortina but was jetting for twin 40's.
40DCOE2 (2) 32chokes 4.5 1.20 F16 1.80 0.50F9 0.40 0.50 2.00
I think if I cross reference enough of these set ups and read a little more into DCOE operating principals I should get a good result.
|
Wozzah
Aficionado
- Total Posts : 453
- Scores: 10
- Reward points: 3886
- Joined: 2011/08/01 11:02:49
- Location: Colac Vic Australia
- Status: offline
Re:DCOE jetting for Kent 1600
2012/05/09 23:38:12
(permalink)
ratta tat tat
After making this post I sat down and read my haynes weber manual purchased a while back. It was a pleasant surprise to find an appendix in the back showing the exact carbs and set up for many weber conversions.
e.g 1275 mini cooper S: 45DCOE13 (1) 38 choke 5.00 1.60 F16 1.70 0.45F9 0.50 1.00 2.25
It did have 1600xflow cortina but was jetting for twin 40's.
40DCOE2 (2) 32chokes 4.5 1.20 F16 1.80 0.50F9 0.40 0.50 2.00
I think if I cross reference enough of these set ups and read a little more into DCOE operating principals I should get a good result.
Any book, chart or advice from others is a GUIDE only. If they're already on there and running the only way to get them spot on is on a dyno, otherwise you have no idea what you're changing and why your changing it. Cheers Woz
|
ratta tat tat
Supporter
- Total Posts : 1633
- Scores: 39
- Reward points: 5492
- Joined: 2011/08/01 11:02:49
- Location: Brisbane
- Status: offline
Re:DCOE jetting for Kent 1600
2012/05/10 00:27:48
(permalink)
I know where you're coming from wozza. For me the costs of dyno tuning outweigh any performance benifits of the 1.6
Jets are cheap, if some minor jetting changes don't improve things I'll most likely leave it as-is.
|
ratta tat tat
Supporter
- Total Posts : 1633
- Scores: 39
- Reward points: 5492
- Joined: 2011/08/01 11:02:49
- Location: Brisbane
- Status: offline
Re:DCOE jetting for Kent 1600
2012/05/10 00:46:02
(permalink)
or try out the 32/36 that came with it :)
|
Wozzah
Aficionado
- Total Posts : 453
- Scores: 10
- Reward points: 3886
- Joined: 2011/08/01 11:02:49
- Location: Colac Vic Australia
- Status: offline
Re:DCOE jetting for Kent 1600
2012/05/10 12:51:49
(permalink)
ratta tat tat
I know where you're coming from wozza. For me the costs of dyno tuning outweigh any performance benifits of the 1.6
Jets are cheap, if some minor jetting changes don't improve things I'll most likely leave it as-is.
Dyno tuning is far cheaper than melting a piston because you tried to run it too lean, or burning out valves becuase it was too lean on the cruise......... Jets are cheap, engines aren't, do it once, do it properly....... Woz
|
ratta tat tat
Supporter
- Total Posts : 1633
- Scores: 39
- Reward points: 5492
- Joined: 2011/08/01 11:02:49
- Location: Brisbane
- Status: offline
Re:DCOE jetting for Kent 1600
2012/05/10 14:28:43
(permalink)
Plug colours are fine and show no possibilty of such situations. Advice muchly appreciated. Thanks
|
Peelo
Enthusiast
- Total Posts : 31
- Scores: 0
- Reward points: 2305
- Joined: 2011/08/01 11:02:49
- Location: Narwee New South Wales Australia
- Status: offline
Re:DCOE jetting for Kent 1600
2012/05/16 19:54:45
(permalink)
ratta tat tat
Plug colours are fine and show no possibilty of such situations. Advice muchly appreciated. Thanks
Suggest you don't place too much faith in plug colour. Time was with leaded fuel black represented rich, brown represented OK and white represented lean. Unleaded fuel burns black right across the spectrum.
|
ratta tat tat
Supporter
- Total Posts : 1633
- Scores: 39
- Reward points: 5492
- Joined: 2011/08/01 11:02:49
- Location: Brisbane
- Status: offline
Re:DCOE jetting for Kent 1600
2012/05/16 22:01:55
(permalink)
I have put faith in over 200 weber conversion examples in my haynes weber manual, many of these being 1600cc 8 valve engines.
Jetting is now 32 chokes, 4.5 Aux venturis, 140 mains, F9 emulsions, 200 air, 50F8 idle, 35 pump, 40 ex.
These sizes are well within range if not richer than the examples shown in the manual. I road tested last night and ran very well. And saved some $400 that would have been spent on tuning to acheive 2HP.
|
rallyman
Enthusiast
- Total Posts : 3
- Scores: 0
- Reward points: 1
- Joined: 2014/11/25 04:18:17
- Location: Scottish Borders
- Status: offline
Re:DCOE jetting for Kent 1600
2014/11/25 07:33:50
(permalink)
Hi i know its a long time since the previous posts but I was wondering if you recall the full settings for your original low compression engine on a single weber 40? you dont mention emulsion tubes etc?
|
martymexico
Deity
- Total Posts : 2440
- Scores: 285
- Reward points: 5832
- Joined: 2011/08/01 11:02:49
- Location: Adelaide Sth Aust Australia
- Status: offline
Re:DCOE jetting for Kent 1600
2014/11/25 18:35:04
(permalink)
This info came from a tuning book from the early 70s ... It has this page on 1600 with twin 40s and the settings that will get you darn close to where you need..
Attached Image(s)
|
rallyman
Enthusiast
- Total Posts : 3
- Scores: 0
- Reward points: 1
- Joined: 2014/11/25 04:18:17
- Location: Scottish Borders
- Status: offline
Re:DCOE jetting for Kent 1600
2014/11/25 19:37:40
(permalink)
Hi
Thanks for your reply.I have this book but it only shows twin dcoe 40 webers and the single weber would be different.
|
ratta tat tat
Supporter
- Total Posts : 1633
- Scores: 39
- Reward points: 5492
- Joined: 2011/08/01 11:02:49
- Location: Brisbane
- Status: offline
Re:DCOE jetting for Kent 1600
2014/11/25 20:54:23
(permalink)
Engine is long gone (sold) now. Specs on the LC motor would have been 65 starter, 35 pump, 45F9 idle, 40ex, 200 air, 130 main, 32 choke, F9 Emulsions
|