2.8 V6 Carbed Cologne HELP
Discussion
Okay I have never owned a carbed car before so forgive my ignorance.
About a month ago I collected a Ginetta G28 (basically a plastic capri) that came with a carbed 2.8 v6. When I got it, it seemed to be down on power and didn't idle particularly well, I was told that it has a performance cam on it so figured that explained the lumpy idle.
After driving it for a while I thought I would give it a tune up, I took it for a decent drive to make sure it was properly warmed up, turned it off and went to adjust the mixture screws to find they were both wound right in??
I set the speed screw to 1/2 turn after contact and mixture screws to base mixture (1 turn out) Turned it on and it seemed to run loads better, the lumpy idle was gone and it had more power. Great I thought.
Still seemed okay the next day but the idle was a little lumpy which attributed to being cold. Over the week it slowly got worse and by the end of the week the idle was really rough and it hated driving at 1.5kprm very stuttery.
Went to give it another tune last night and the only way I could sort the idle out at all was to turn both the mixture screws right in again. I have since noticed that the vacuum gauge sits at around 10 inches which seems low to me and points the finger towards a vacuum leak?
Started up this morning a little lumpy, as the engine warmed up and I cruised at 60 it returned to being very happy and free revving then once I got into a bit of start stop traffic in town the idle got progressively worse until it would stall if you didn't keep the throttle open.
All help gratefully accepted
EDIT REPOSTED TO TECHNICAL / ENGINE SECTION, cant delete this thread tho?
About a month ago I collected a Ginetta G28 (basically a plastic capri) that came with a carbed 2.8 v6. When I got it, it seemed to be down on power and didn't idle particularly well, I was told that it has a performance cam on it so figured that explained the lumpy idle.
After driving it for a while I thought I would give it a tune up, I took it for a decent drive to make sure it was properly warmed up, turned it off and went to adjust the mixture screws to find they were both wound right in??
I set the speed screw to 1/2 turn after contact and mixture screws to base mixture (1 turn out) Turned it on and it seemed to run loads better, the lumpy idle was gone and it had more power. Great I thought.
Still seemed okay the next day but the idle was a little lumpy which attributed to being cold. Over the week it slowly got worse and by the end of the week the idle was really rough and it hated driving at 1.5kprm very stuttery.
Went to give it another tune last night and the only way I could sort the idle out at all was to turn both the mixture screws right in again. I have since noticed that the vacuum gauge sits at around 10 inches which seems low to me and points the finger towards a vacuum leak?
Started up this morning a little lumpy, as the engine warmed up and I cruised at 60 it returned to being very happy and free revving then once I got into a bit of start stop traffic in town the idle got progressively worse until it would stall if you didn't keep the throttle open.
All help gratefully accepted
EDIT REPOSTED TO TECHNICAL / ENGINE SECTION, cant delete this thread tho?
Edited by luke g28 on Tuesday 18th January 10:23
if i have a engine idling very lumpy, especially such on old iron-cast one, you need to check at first the valve clearances...nothing else!!!!
if these are too tight, the engine runs lumpy.
if you have set them properly the next step woud be to set the ignition timing, followed by the carb.
1.valve clearance
2. ignition timing
3. carb
by the way: what carb is fitted? 38DGAS?
was it an injection engine b4? i guess.
if these are too tight, the engine runs lumpy.
if you have set them properly the next step woud be to set the ignition timing, followed by the carb.
1.valve clearance
2. ignition timing
3. carb
by the way: what carb is fitted? 38DGAS?
was it an injection engine b4? i guess.
Edited by Comadis on Wednesday 19th January 18:39
Comadis said:
if i have a engine idling very lumpy, especially such on old iron-cast one, you need to check at first the valve clearances...nothing else!!!!
if these are too tight, the engine runs lumpy.
if you have set them properly the next step woul be so set mthe ignition timing, followed by the carb.
1.valve clearance
2. ignition timing
3. carb
by the way: what carb is fitted? 38DGAS?
was it an injection engine b4? i guess.
Its a 38DGAS with manual choke. Im pretty sure its always been a carbed engine and hasnt been converted from injection.if these are too tight, the engine runs lumpy.
if you have set them properly the next step woul be so set mthe ignition timing, followed by the carb.
1.valve clearance
2. ignition timing
3. carb
by the way: what carb is fitted? 38DGAS?
was it an injection engine b4? i guess.
As an update to the OP after having another fiddle with the mixture ive got the engine running smoothly (at the moment) but it seems a bit down on power and its still returning <10mpg
However the vacuum gauge sits at 5inches on idle which points to a vacuum leak i.e. running lean :SGassing Station | Ginetta | Top of Page | What's New | My Stuff