Anyone have exper. with older 2 brl Rochester carb?  
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All Forums >> Radios, Batteries, Clubhouse and more >> Full Scale planes, cars, helis, boats >> Boats - Full Scale >> Anyone have exper. with older 2 brl Rochester carb? Page: [1]

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Anyone have exper. with older 2 brl Rochester carb? - 6/21/2007 4:39:44 PM   
Jazzy



Posts: 1097
Joined: 1/8/2002
From: Erie, PA, USA
Status: offline 		Hi all,

I've been restoring a 21 ft. '76 Reinell with cutty. OMC stringer drive.
It has a 289 cu in 165 HP GM straight 6 with a 2 brl Rochester carb / heat-rise choke.

Engine sarts and runs good - a little rich until the choke opens up. After running at operating temp (~170 deg.) for 20-30 min. it starts cutting out. Just won't open up. I opened the HS needle about a quarter turn & that helped a good bit.
It almost seems like it is vapor-locking. I've run all kinds of fuel cleaners & conditioners through it - even octane boost.
Someone mentioned the coil could be goin' bad...?
Just wondering what the deal could be...?
Any help out there?

TIA,
Jeff

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RE: Anyone have exper. with older 2 brl Rochester carb? - 7/11/2007 12:39:05 AM   
Tommygun



Posts: 795
Joined: 2/13/2002
From: Burlington, NJ, USA
Status: offline 		How long has it been since the carb has been rebuilt? I'd start with that. If you opened the high speed needle and it helped, you're probably going lean. I know an abnormally high amount of guys losing fuel pumps this year, including myself. Do you have ethanol in your fuel? Does your boat have a fiberglass fuel tank? If so, you'll need to get that swapped out with an aluminum one, since the ethanol will start dissolving the resin. This resin will then mix with the fuel and go straight to the carb. It will gunk everything on the way to the combustion chamber, and eventually damage the engine. What have you found so far?

< Message edited by Tommygun -- 7/11/2007 12:40:06 AM >

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RE: Anyone have exper. with older 2 brl Rochester carb? - 7/15/2007 2:56:01 PM   
Bud Faulkner



Posts: 897
Joined: 9/24/2002
From: Mt Airy, MD, USA
Status: offline 		Had a similisr problem this past weekend on my cousins grady white, seemed to be vapor locking. Turning the blower on cured it. Is your engine vented to the outside?

Bud

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RE: Anyone have exper. with older 2 brl Rochester carb? - 8/27/2007 1:28:06 PM   
on pipe



Posts: 225
Joined: 12/9/2004
From: Omaha, NE, USA
Status: offline 		If it is really triggered by the heat, then that usually means that the secondary ignition is breaking down. Check rotor, cap, wires, plugs. Rochester Dualjet carbs are pretty trouble free. The mixture screws are for idle only. Also make sure there isn't water in the gas. Ross

(in reply to Bud Faulkner)
       Post #: 4

RE: Anyone have exper. with older 2 brl Rochester carb? - 11/17/2007 3:52:06 PM   
Beagle RC Air


 

Posts: 63
Joined: 9/1/2002
From: Raymond, WA, USA
Status: offline 		The Rochester carburetor on those older GM straight 6's were very good and relatively trouble free. But, that probably is a 30 year old carb! I would take it to someone who still has carb rebuilding skills and have it gone thru. Just a simple thing like a float that is saturated will cause all sorts of running issues including fuel economy. Those motors were 230/250/292 CID, not sure but I would imagine you have the 230 or 250. No HS needle adjustments. An analysis of the ignition system by a qualified tech would be good idea also, given the high cost of fuel. Of the marine engines I have owned in the past, these 6 cly GM marine engines were the best by far. Don't trade out any electrical or fuel components for automotive counterparts.

(in reply to Jazzy)
       Post #: 5

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All Forums >> Radios, Batteries, Clubhouse and more >> Full Scale planes, cars, helis, boats >> Boats - Full Scale >> Anyone have exper. with older 2 brl Rochester carb?
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