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Location:
Brisbane
Registered:
July 2004
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Trouble through carby 4K
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Tue, 11 January 2005 12:09
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gday, just got my 4k runnig again, but its got a 3K head on it, only problem is im not positive if no1. was at top dead centre and now i think the timing is about 20 degrees out, she will idle but it keeps popping air/fuel out the troat of the carby when i rev it, ther is not much power and i know its the timing, is the only way to get TDC with the screwdriver so i can find 0 TDC on the harmonic, and what degrees will i need to set the engine on runnig optimax, 3K head, ported so 10.5comp, standard carb/cam/exhaust what should i set the timing to?
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Location:
Brisbane
Registered:
July 2004
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Re: Trouble through carby 4K
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Wed, 12 January 2005 00:21
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anyone?
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Location:
Hackham South Australia
Registered:
July 2004
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Re: Trouble through carby 4K
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Wed, 12 January 2005 02:42
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Hi this may help.
The 3K-B motor ran a 10:1 CR and ran on leaded which had an octane rating of approximately 96. This motor ran 10 degress BTC.
I would assume, that cause you are running optimax which is about 98 octane and 10.5:1 CR that you can use this as well, if not a little bit more without pinking (also know as pinging) but as a safety procaution I would use 10 degress BTC as a start.
Make sure that you have put the dizzy back in the right spot. I would definately run a timing light over it.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Trouble through carby 4K
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Wed, 12 January 2005 09:14
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| scano wrote on Tue, 11 January 2005 23:09 |
gday, just got my 4k runnig again, but its got a 3K head on it, only problem is im not positive if no1. was at top dead centre and now i think the timing is about 20 degrees out, she will idle but it keeps popping air/fuel out the troat of the carby when i rev it, ther is not much power and i know its the timing, is the only way to get TDC with the screwdriver so i can find 0 TDC on the harmonic, and what degrees will i need to set the engine on runnig optimax, 3K head, ported so 10.5comp, standard carb/cam/exhaust what should i set the timing to?
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why nopt use a timing light?
if you have a stock cam, keep around 10deg advance.
if you have more overlap, you can use more advance.
did you adjust the valve clearances properly?
i would shine a torch down the spark plug hole and see where the pistons stops..
the crank pulley has a timing mark that will tell you where TDC is anyway, or do you mean the cam timing is out?
turn crank to TDC, soo if the 'on the rock' valves are at equalk heights..
Cya, Stewart
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Location:
Brisbane
Registered:
July 2004
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Re: Trouble through carby 4K
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Wed, 12 January 2005 11:43
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yer i did the head myself, but i havent checked the valve clearance when the engine is hot, what is the clearance i may have the setting too high, im running it at the moment without a air cleaner, bracing, and it keeps popping air/fuel out the primary barrel out towards the sky, its not igniting just spraying out when i rev it, i goes, but its easy to tell its the timing, im going to check TDC tomorrow but what should i mark the balancer as? does a pencil, whiteout work for the timing light, i have a timing light she holds idle at about 15degrees, because of the new head, do i need to also tune my carb to run richer or have a higher idle, because id be close to stalling if i run the car at 10degrees, and at 15 she struggless to drive, im assuming the timing is out already so my reading is probably really inaccurate, but i need to know what to mark the harmonic balancer with so i can see its line, and what i need to know what the feeler gauge measurement, and why she'd be spittin out the carby like that
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Location:
Brisbane
Registered:
July 2004
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Re: Trouble through carby 4K
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Mon, 17 January 2005 02:00
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anyone?
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Trouble through carby 4K
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Mon, 17 January 2005 22:46
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valve clearance cold is 0.2mm intake, 0.3mm exhaust. hot maybe 0.18/0.25mm (thats what i use)?
the crank pulley has a timing mark on it, and that can't change since it is keyed to the crank. turn the crank pulley to TDC, then see if the valves that are 'on the rock' are at the same height. if not, the cam may be out.
otherwise, check your ignition timing.
use liquid paper to mark the timing mark.
not really.. a little richer is better for higher compression, but the stock carbs run rich usually anyway.
are you using a stock carby? stock exhaust manifold, stock cam?
| scano wrote on Wed, 12 January 2005 22:43 |
yer i did the head myself, but i havent checked the valve clearance when the engine is hot, what is the clearance i may have the setting too high, im running it at the moment without a air cleaner, bracing, and it keeps popping air/fuel out the primary barrel out towards the sky, its not igniting just spraying out when i rev it, i goes, but its easy to tell its the timing, im going to check TDC tomorrow but what should i mark the balancer as? does a pencil, whiteout work for the timing light, i have a timing light she holds idle at about 15degrees, because of the new head, do i need to also tune my carb to run richer or have a higher idle, because id be close to stalling if i run the car at 10degrees, and at 15 she struggless to drive, im assuming the timing is out already so my reading is probably really inaccurate, but i need to know what to mark the harmonic balancer with so i can see its line, and what i need to know what the feeler gauge measurement, and why she'd be spittin out the carby like that
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Location:
Brisbane
Registered:
July 2004
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Re: Trouble through carby 4K
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Wed, 19 January 2005 08:45
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yer the entire engine is stock except for the 3K head with port work and cc work, it will hold idle at about 12 BTDC but its got no power and it keeps spraying fuel out the carb. i guess its cause i havent found TDC but i'm yet to do that i just really wanna sell it and need to get her running efficently
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