Thread: carb or timing
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04-24-2005 03:57 PM #1
carb or timing
Hey everyone!!!
I have 850 Q-jet edelbrock #1910 suppose to be calibrated 4 engines 500+ hp i am probably far from that. its a 406 rotating assembly 10.5 to 1 compression dart iron eagle heads 2.08 intake valves 230 cc runners 72 cc chambers cam is a comp roller extreme with intake 230 duration @ .050 236 exhaust @ .050 msd 6AL box limiter set at 6000. I think my timing is set at 20 dergrees base timing. I set it at idle 900 rpms with 20 deg. is this ok. Denny had a article from hot rod mag. or somthing that he posted about timing. Now for my prob. steady speeds it misses
foot in it, it clears up now when i take the load off and put in nuetral and rev it to 2000 rpm and hold it, it will start missing again and if i hold there it will continue to miss drop to about idle speed with that miss let of and it idles fine no miss or nothing.
When i mess with timing nothing changes.
confused
Bryon
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04-24-2005 07:17 PM #2
how old is this engine?(since rebuilt)
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04-24-2005 07:42 PM #3
cap and rotor-plugs and wires, fuel quality?Choose your battles well===If it dont go chrome it
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04-24-2005 07:47 PM #4
the engine has 30 miles on it maybe if that!!
the cap rotor and wires are all brand new premium fuel
filled this year!!!!
No O2 sensor
One other thing i put smaller jets in this carb and it got worse
hahaha maybe i should try going with bigger jets
sorry forgot to mention that but i just assume that the carb is too much anyway!!!
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04-24-2005 07:51 PM #5
yeah it looks like its the carb..........did you build the engine ?thanks
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04-24-2005 07:56 PM #6
no morris racing engines built it i just put intake, carb,
and distributor in it fired rite up after install but that damn
miss last motor it was there with a cruising.----puh----
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04-24-2005 08:11 PM #7
Just for kicks pull one of the rear plugs to check for gas soak. I aalso have a feeling the carb is too big for cruising.Choose your battles well===If it dont go chrome it
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04-24-2005 08:12 PM #8
i left specs in first post its a intake is 230 @ .050 exhaust 236 @ .050 int. .510 exh. .520 centerline is 106
lobe seperation 110 its also a roller setup if that helps
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04-24-2005 08:14 PM #9
ummm if you messed with the timing its prolly not that carb could be or even your distributer is the gear right on it?
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04-24-2005 08:19 PM #10
yeah your probably haven a problem with that carb thats alot of carburation on a engine your not sure about if i was you id try to find somone with a carb you can borrow or get cheap and trow it on see what that does
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04-24-2005 08:20 PM #11
autocity when i mess with the timing the only thing that changes is the idle note it acts the same at cruise. See the biggest prob.
I have is that the ignition and fuel delivery i have been told is that they act the same so i messed with the timing same ole.
i changed the jet from a 73 to a 68 that the next size down that i have it got worse but with the 73 its to rich out hte tail pipe
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04-24-2005 08:22 PM #12
i was told to go to 75 jet and set my power valve screw down
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04-24-2005 08:26 PM #13
if you've got a miss when the motor is loaded down it sounds like plug wires to me. a plug will brake down under load to. i'd check the plugs and plug rires a little closer.Mike
check my home page out!!!
http://hometown.aol.com/kanhandco2/index.html
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04-24-2005 08:31 PM #14
it does it in nuetral also
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04-24-2005 09:34 PM #15
I think you may be too lean. With that lobe seperation you will smell nasty at the tail pipes due to the extra overlap. 850 is a little big on the carb but not too terribably large for your setup. Keep tinkering with those jets.
Welcome to CHR. I think that you need to hook up your vacuum advance. At part throttle when cruising you have less air and fuel in each cylinder, and the air-fuel mixture is not as densely packed...
MSD 8360 distributor vacuum advance