Re jetting quadrajet carb
04-24-2019, 09:56 PM
#11
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04-24-2019, 10:02 PM
#12
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This one ?
https://www.summitracing.com/parts/c...44-4/overview/
Brand:COMP Cams
Manufacturer's Part Number:12-244-4
Product Line:COMP Cams Xtreme Marine Camshafts
Summit Racing Part Number:CCA-12-244-4
Cam Style:Hydraulic flat tappet
Basic Operating RPM Range:2,000-6,200
Duration at 050 inch Lift:234 int./244 exh.
Advertised Duration:278 int./292 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.498 int./0.500 exh.
Lobe Separation (degrees):112
If so, yeh,exhaust sucking water back is a huge possibility
#2, engine will probably ant initial timing somewhere between 16-20* BTDC
#3 the stock carb metering will be out too lunch. don't know what to suggest with your cam/comp....can't help you there as cams that large I have a Holley Carb on it.
https://www.summitracing.com/parts/c...44-4/overview/
Brand:COMP Cams
Manufacturer's Part Number:12-244-4
Product Line:COMP Cams Xtreme Marine Camshafts
Summit Racing Part Number:CCA-12-244-4
Cam Style:Hydraulic flat tappet
Basic Operating RPM Range:2,000-6,200
Duration at 050 inch Lift:234 int./244 exh.
Advertised Duration:278 int./292 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.498 int./0.500 exh.
Lobe Separation (degrees):112
If so, yeh,exhaust sucking water back is a huge possibility
#2, engine will probably ant initial timing somewhere between 16-20* BTDC
#3 the stock carb metering will be out too lunch. don't know what to suggest with your cam/comp....can't help you there as cams that large I have a Holley Carb on it.
Last edited by EDT; 04-24-2019 at 10:10 PM.
04-24-2019, 10:07 PM
#13
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Same cam, same cam part # . CCA-CL12-244-4
You just linked the cam + lifter kit. # CL12-244-4
You just linked the cam + lifter kit. # CL12-244-4
04-25-2019, 07:48 AM
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Some good Qjet idle/low speed tuning info linked below.
Drilling Qjet Idle Tubes- Fact, or just BS ?? - Performance Years Online Forums
Drilling Qjet Idle Tubes- Fact, or just BS ?? - Performance Years Online Forums
Last edited by SS496; 04-25-2019 at 07:50 AM.
04-25-2019, 10:21 AM
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Bump it to 20* initial (idle) ......but DO NOT drive the boat like that since that will likely be overtimed once the centrifugal advance kicks in....this is simply seeing what it wants for idle timing.
You will likely need to reduce the amount of centrifugal advance so you can run more initial and not overtime the engine while running at higher RPM under load.
What is your total timing now?
You will likely need to reduce the amount of centrifugal advance so you can run more initial and not overtime the engine while running at higher RPM under load.
What is your total timing now?
04-25-2019, 11:10 AM
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Bump it to 20* initial (idle) ......but DO NOT drive the boat like that since that will likely be overtimed once the centrifugal advance kicks in....this is simply seeing what it wants for idle timing.
You will likely need to reduce the amount of centrifugal advance so you can run more initial and not overtime the engine while running at higher RPM under load.
What is your total timing now?
You will likely need to reduce the amount of centrifugal advance so you can run more initial and not overtime the engine while running at higher RPM under load.
What is your total timing now?
04-25-2019, 12:13 PM
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Bump it to 20* initial (idle) ......but DO NOT drive the boat like that since that will likely be overtimed once the centrifugal advance kicks in....this is simply seeing what it wants for idle timing.
You will likely need to reduce the amount of centrifugal advance so you can run more initial and not overtime the engine while running at higher RPM under load.
What is your total timing now?
You will likely need to reduce the amount of centrifugal advance so you can run more initial and not overtime the engine while running at higher RPM under load.
What is your total timing now?
