- Joined
- Jun 17, 2004
- Messages
- 359
Ok a bit of a disclaimer, this one is running in my 65 Mustang, but I am hoping that someone on here may have the knowledge to help me diagnose a new issue. I have a 302 roller motor that I built last year and I topped it off with an Edelbrock 1406 car that I had on an old 289. It is running with 1" aluminum spacers on the stock intake manifold. I jetted it down (knowing that a 1406 comes jetted from the factory for a Ch##y 350) to the primary being .095 and secondary being .092, rods remained stock .075 x .047, and until recently it has run pretty damn good (but still rich and smelled a bit like gas on occasion)
So we recently have a heat wave for this time of the year hitting us here, temperatures going up to about 32 degrees C (which is normal here in the summer). I was out cruising down the highway and had to brake pretty quick as there was a stall ahead and traffic backing up. As I did, it died as quick as if I turned the key off an would not restart. I pulled over and checked the ignition thinking it was something electrical but everything checked out as best I could roadside, and then popped the air filter off. Gas was boiling in the bowls even though the temp gauge showed 195. So my first inclination is a phenolic spacer to keep the heat transfer down, but that's not all. I was able to restart the engine by keeping my foot to the floor on the throttle and cranking it over. It then began running like shit, stumbling and sputtering, but it got me home.
Today I took it out for some running around. Again its a hot day at 32 and for the first couple of hours it ran like a top. A little rich as usual as I could smell some has occasionally, but no issues, Until I stopped for a half hour. I hopped into the car, fired it up and went to drive away and it stalled. And again it would not start, fuel bubbling in the bowls and eventually using the full throttle method it fired up, but this time it was way worse. Stalled multiple times on the way home, smelled of gas and carbon something fierce and really made it look like I was learning to drive stick as it jerked and jumped.
Once I got home and into the garage, I began pulling plugs and found each one of them carbon fouled. Black soot on all plugs, a slight gas smell but not much, wet threads, but not wet electrode. I figure it is severely over fueling itself, but only once it gets hot. This is confusing me some and the manual for this carb is just short of rocket science....
So does anyone have any insights into the tuning? I'm thinking a phenolic spacer to keep the heat transfer down, but am wondering if I am still jetted too high? Could timing be an issue? Do I need to change the metering rods out?
I tuned it last spring using a vacuum gauge as per the manual and it ran really nice all last summer, but this year its running like a heep.
I was contemplating putting this same setup into my Bronco, but now I am leaning again toward fuel injection.
Thanks if you've read my ramble this far....
So we recently have a heat wave for this time of the year hitting us here, temperatures going up to about 32 degrees C (which is normal here in the summer). I was out cruising down the highway and had to brake pretty quick as there was a stall ahead and traffic backing up. As I did, it died as quick as if I turned the key off an would not restart. I pulled over and checked the ignition thinking it was something electrical but everything checked out as best I could roadside, and then popped the air filter off. Gas was boiling in the bowls even though the temp gauge showed 195. So my first inclination is a phenolic spacer to keep the heat transfer down, but that's not all. I was able to restart the engine by keeping my foot to the floor on the throttle and cranking it over. It then began running like shit, stumbling and sputtering, but it got me home.
Today I took it out for some running around. Again its a hot day at 32 and for the first couple of hours it ran like a top. A little rich as usual as I could smell some has occasionally, but no issues, Until I stopped for a half hour. I hopped into the car, fired it up and went to drive away and it stalled. And again it would not start, fuel bubbling in the bowls and eventually using the full throttle method it fired up, but this time it was way worse. Stalled multiple times on the way home, smelled of gas and carbon something fierce and really made it look like I was learning to drive stick as it jerked and jumped.
Once I got home and into the garage, I began pulling plugs and found each one of them carbon fouled. Black soot on all plugs, a slight gas smell but not much, wet threads, but not wet electrode. I figure it is severely over fueling itself, but only once it gets hot. This is confusing me some and the manual for this carb is just short of rocket science....
So does anyone have any insights into the tuning? I'm thinking a phenolic spacer to keep the heat transfer down, but am wondering if I am still jetted too high? Could timing be an issue? Do I need to change the metering rods out?
I tuned it last spring using a vacuum gauge as per the manual and it ran really nice all last summer, but this year its running like a heep.
I was contemplating putting this same setup into my Bronco, but now I am leaning again toward fuel injection.
Thanks if you've read my ramble this far....
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