Re: Super-Fly LSR attempt
Posted: Fri Jan 30, 2015 8:57 amHi Guys
It's 2015 so I figured I should begin making the small changes to the LSR before road tests this spring.
Having some serious doubt's or reservations with my fuel delivery system (pulse pump flow capacity), I have decided to install a small 12v automotive 'Facet cube' pump. John happened to have a used one in his inventory and offered it 'for-the-cause'! Thanks John!
The old pulse pump technology seemed to work fine if you supplied a good crankcase signal, but I noticed at higher engine rpm's (13,000) the output flow, while observed through a clear fuel line, started to diminish at upper revs. These small pumps must suffer from something similar to 4-stroke valve float at higher rpm's.
The possibility of running lean would spell disaster at Bonneville at mile 2 and WOT!
This situation could only be worst if I decided to run the 20% Nitro configuration, which requires even larger jetting....
So, last night, I started plumbing the new electric pump, with electrical wiring to follow.
The LSR rules require electric pumps to have a shut-off switch as well as fuel shut-off valve, both operated at the handle bars.
I'll try to put some pics up as the mod progresses.
The PLAN is to run at Bonneville August 2015!
George
It's 2015 so I figured I should begin making the small changes to the LSR before road tests this spring.
Having some serious doubt's or reservations with my fuel delivery system (pulse pump flow capacity), I have decided to install a small 12v automotive 'Facet cube' pump. John happened to have a used one in his inventory and offered it 'for-the-cause'! Thanks John!
The old pulse pump technology seemed to work fine if you supplied a good crankcase signal, but I noticed at higher engine rpm's (13,000) the output flow, while observed through a clear fuel line, started to diminish at upper revs. These small pumps must suffer from something similar to 4-stroke valve float at higher rpm's.
The possibility of running lean would spell disaster at Bonneville at mile 2 and WOT!
This situation could only be worst if I decided to run the 20% Nitro configuration, which requires even larger jetting....
So, last night, I started plumbing the new electric pump, with electrical wiring to follow.
The LSR rules require electric pumps to have a shut-off switch as well as fuel shut-off valve, both operated at the handle bars.
I'll try to put some pics up as the mod progresses.
The PLAN is to run at Bonneville August 2015!
George