Tweety

A VTR engine in a go-cart??? You're nut's... completely nut's... But in a decidedly good way...

Can I come over and play!?

Seriously though, a low power fuel pump should work, start low and find the sweet spot...

I'm sure there are alot of other variables involved but you could probably look at the fuel pressure on the SP-1 for a genereal idea of the pressure... it should prbably be a bit lower that that thoo...

Hawkrider

No, SP-1 is fuel injected. Regulating to 1 or 2 psi will work. Just make sure you have good float valves (they are cheap to replace) and that you have enough pressure that you don't go lean under high rpm/high load situations.

spekbikes

Alright thanks guys, the pump im using is kinda abit over kill, i went 11.40s with it in my car, so it should support my go kart!! Ill post some pictures of the buildup.
FYI: i plan on going over 100mph in the 1/4 with this kart. This is a just for kicks project.

Hawkrider

Too much pressure could cause the float valves to leak by. Be careful.

spekbikes

Hey A new question here! im tryin to eliminate everything i can to simplify it!! Now why do i need to have my coolant run through my carbs? all that is doing is bringing my carbs upto temperature faster correct?
cuz if it is, Thats exackly what i dont want. (hot fuel)

JamieDaugherty

The thermostat will shut off the coolant flow before the engine reaches full operating pressure. Don't worry, Honda would not heat the carbs all of the time. They aren't Suzuki after all.

Try using a pump from an 80's Honda Civic, one that is carburated. They run about 2psi and would work perfectly. I wouldn't put your big daddy pump on there as it will only cause you problems. This is a high tech motorcycle engine and does not suck down fuel like a V8 car engine would.

Hawkrider

Jamie,

I thought we went through this before? Didn't we decide that since the supply line to the carb heating comes from the bottom of the thermostat housing (which also has coolant coming from the motor) then the carb heating is always on. The thermostat being open or closed does not turn carb heating on or off. The thermostat is either open or closed. It's not a three-way valve.

Hawkrider

This is the way I understand it as the engine is cool before the thermostat opens:



...and when it's hot:

Hawkrider

Nevertheless, I really don't think you'll need carb heating for the go-cart.

spekbikes

Yeah, i would prefer to have it off but i wasnt sure if it was needed for some reason so i just wanted to doublecheck!
Thanks again
Also, this go kart is not going to be driven for long periods of time, or long idle periods, do you think i could get away with running just one of the rads. with the fan wired permanently on? Or do these engines run pretty hot?

Hawkrider

Yes, that should be fine too. You'll know if it starts to overheat.