Fuel starvation when maxing out? |
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Fuel starvation when maxing out? |
David Stowers |
Feb 10 2014, 07:01 AM
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#1
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Member Group: Members Posts: 99 Joined: 28-June 12 From: UK Member No.: 14,613 Region Association: None |
My 914 is running a 1.8 (ish!) 40 Dellortos and recently recorded 111BHP and 121lbft of torque after a carb set up so yesterday I went to have a little thrash about.
A couple of times when the traffic cleared I really kept my foot flat down and pushed to over 100MPH on a slight uphill. It was still pulling strongly for a few seconds then seemed to lose power and splutter slightly. I backed off and it returned to normal. It seemed like the carbs emptied as if the fuel pump couldn't keep up. I had the heater on and the rich oily aroma changed to a hot sharp smell like it suddenly ran lean. It's running the small square facet pump mounted up front near the master cylinder. Any ideas please Thanks David |
ThePaintedMan |
Feb 12 2014, 10:28 AM
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#2
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Advanced Member Group: Members Posts: 3,886 Joined: 6-September 11 From: St. Petersburg, FL Member No.: 13,527 Region Association: South East States |
Some good comments here from folks with far more experience than I. I agree that the float settings are also a suspect, especially if the carbs were installed "out of the box." It seems that even if they are set correctly, the settings can often change during shipping/handling. So it's certainly something to check for anyone installing carbs.
That being said, I still believe that putting in a good quality rotary pump, along with fuel filter (prior to the pump) and if need be, a regulator can eliminate a lot of potential sources of frustration. Also, if the condition of the strainer sock in the bottom of the tank is unknown, this should be checked and replaced. If clogged, it can mimic symptoms of starvation, especially under situations like full throttle where the volume of fuel being delivered is important. Regarding venting of the tank - I used the nipple off of the stock expansion tank and routed a line out to the rocker panel area. Seems to work quite well and eliminates all fumes that could potentially enter the cabin. |
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