80 Twin

[Tim Kish]

How much fuel do you go through in a race, how much fuel does your tanks hold?

Thanks Tim

 

[jeff baham]

tim i have a 67 twin and my tank are 20 oz each. i just like to have a little extra fuel.

 

[Tim Kish]

This is my problem

My 90 Extreme will only hold 19 oz of fuel per tank without going to some crazy modified tank set up.

I am currently running 80's in the boat and the tanks currently in the boat hold just a little over 18 oz's and I am not finishing heats , my old twin held almost 22 oz's and there was no problems at all.

Tanks are close to empty and both motors are shutting down at the same time.

Running Picco 80's with AB pipes , nothing fancy on the set up at all.

Tim

 

[Joe Warren]

Tim I raced that boat for 3-4 years with Picco 80s never had a problem. 1667 props 6.2 dirty cold water 6.3 props full diameter. clean water wth good air. .018 head clearence on 60 percent fuel........ if you are running blue head picco 80 engines? They leaked water 100 percent of the time, We never stopped the blue head picco from leaking water into the boat. cooling heads warped easily. and the head was blasted just before power coating. Both allow uneven surfaces that dont seal water. I`am pretty sure those walt barney tanks are 18.5 ea, pull the pipe pressure line the next time it comes in and blow the remaining fuel into a measuring cup ( pay close attention to air bubbles) to see how close you are.. also if you are richer on one engine you may be running that engine empty and taking the other engine out. also leaks in the outer seams of the tank will empty the fuel into the boat. Just some things to look at. it never had a problem with those size tanks before & The boat and tank set up would easily feed a set of CMB 90`s

 

[Tim Kish]

Tim I raced that boat for 3-4 years with Picco 80s never had a problem. 1667 props 6.2 dirty cold water 6.3 props full diameter. clean water wth good air. .018 head clearence on 60 percent fuel........ if you are running blue head picco 80 engines? They leaked water 100 percent of the time, We never stopped the blue head picco from leaking water into the boat. cooling heads warped easily. and the head was blasted just before power coating. Both allow uneven surfaces that dont seal water. I`am pretty sure those walt barney tanks are 18.5 ea, pull the pipe pressure line the next time it comes in and blow the remaining fuel into a measuring cup to see how close you are..

Picco silver heads and less than an oz of fuel both tanks after a heat.

I am going to try filling the tanks and draining into a measuring cup , maybe they are not filling to capacity ????

 

[Joe Warren]

check the tanks with a long fuel hose from a elevated shelf and see if they will completely siphon themself out & measure them with a 2 stroke fuel mixer cup

 

[Tim Kish]

check the tanks with a long fuel hose from a elavated shelf and see if they will completely siphon themself out.

Will do Joe and I'm running the motors on the rich side but not that rich. lol

 

[julianconde]

Tim on the Twin i sold you i had those tanks and never had a problem with fuel but also what i did also to help that was i started to crank the 1st motor at 1min 45sec and you should have no problem at that point lean them down brother..

Thats why i like the New Roadrunner Extereme big fuel tank area for huge fuel tanks Even with the large amount of fuel we have on our 101RS Twins i still start my 1st motor at around 1min 50sec..

 

[Tim Kish]

Tim on the Twin i sold you i had those tanks and never had a problem with fuel but also what i did also to help that was i started to crank the 1st motor at 1min 45sec and you should have no problem at that point lean them down brother..

Thats why i like the New Roadrunner Extereme big fuel tank area for huge fuel tanks Even with the large amount of fuel we have on our 101RS Twins i still start my 1st motor at around 1min 50sec..

The tanks I used in your old boat were 22oz's Julian the new boats tanks are considerably smaller , should be able to go at the start of the clock with a twin and run a full race with out problems.

I waited on the clock in Hobart and jumped the start had to do another lap and never finished lol , should never be that close.

Leaning on the needle is not the answer , the boat is running very strong as it is.

Will check the tanks and see.

 

[julianconde]

yeah i agree with you but whats the hurry to go in right at the start of the clock. With my Twin i can go in right at the start at the clock but i choose not too i always wait just alittle bit or be the last one in the water after i complete the Final Heat Joe and I keep having a duel to see who runs out of fuel 1st so far im 1-0 he flipped the Boat on the turn in Eville LOL.

 

[Tim Kish]

No hurry to get in the water but with a twin you are twice as likely to have problems in the hot pits so I choose to go right away just in case something pops up.

 

[julianconde]

cant argue that either. i look at it the less time i mill the less likely i would get tangled up with someone else ;-)

when you going to make the move to 101RS ??

 

[Blackout]

No hurry to get in the water but with a twin you are twice as likely to have problems in the hot pits so I choose to go right away just in case something pops up.

I agree, I don't have a twin and I go in at the start of the clock just in case something happens....

I suppose lower nitro would help, but then you are slower....

 

[Blackout]

cant argue that either. i look at it the less time i mill the less likely i would get tangled up with someone else ;-)

when you going to make the move to 101RS ??

That's a good point as well. I need the mill time to get in the groove, and I'm not running the speeds you twin guys are running.

 

[julianconde]

No hurry to get in the water but with a twin you are twice as likely to have problems in the hot pits so I choose to go right away just in case something pops up.

I agree, I don't have a twin and I go in at the start of the clock just in case something happens....

I suppose lower nitro would help, but then you are slower....

not really theres racers that go fast with lower nitro content. depends on how the engine is build and modified

 

[julianconde]

cant argue that either. i look at it the less time i mill the less likely i would get tangled up with someone else ;-)

when you going to make the move to 101RS ??

That's a good point as well. I need the mill time to get in the groove, and I'm not running the speeds you twin guys are running.

Maybe someone will let you take the controls of one so you can have a 1st hand experience that would be awesome

 

[Tim Kish]

No hurry to get in the water but with a twin you are twice as likely to have problems in the hot pits so I choose to go right away just in case something pops up.

I agree, I don't have a twin and I go in at the start of the clock just in case something happens....

I suppose lower nitro would help, but then you are slower....

Running slower is not an option.

 

[Tim Kish]

cant argue that either. i look at it the less time i mill the less likely i would get tangled up with someone else ;-)

when you going to make the move to 101RS ??

That's a good point as well. I need the mill time to get in the groove, and I'm not running the speeds you twin guys are running.

Maybe someone will let you take the controls of one so you can have a 1st hand experience that would be awesome

I'll let Craig try mine next year if he wants.

 

[julianconde]

cant argue that either. i look at it the less time i mill the less likely i would get tangled up with someone else ;-)

when you going to make the move to 101RS ??

That's a good point as well. I need the mill time to get in the groove, and I'm not running the speeds you twin guys are running.

Maybe someone will let you take the controls of one so you can have a 1st hand experience that would be awesome

I'll let Craig try mine next year if he wants.

he would really like that

 

[Tim Kish]

Alright this is what I've found.

Filled both tanks to capacity and let the drain by gravity into a measuring cup.

Both tanks drained completely dry , checked how much fuel was in measuring cup , just under 16oz.

Not near enough fuel for Picco 80's , that has to be the problem.

I gave Mr Barney the max dimensions I could fit in the tub and he estimates it to be just under 19oz's .

Looks like I need new tanks.