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I have 39.5 pwks and have been thinking about running a pump. They are standard non pump style carbs. I have heard it can be done, but what needs to be changed? I have some interest in trying 1/4mile asphalt but mostly want to make sure I can make it up the mountain without issues. This is for an ALKY setup...

Thanks
Dave
 

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QUOTE (Dave I. @ May 25 2008, 03:28 AM) index.php?act=findpost&pid=1043Alky. I should have made that clear.

There are several different types of pumps available..

Around here, we all use the DF62, it's the high flow pump, but we all use pumper style carbs....so, no issues.

That pump flows 65L per hour.

They make other pumps that flow 35L per hour, and I believe one that flows 14L per hour.

The problem is you're gonna overpower the larger needle and seat found on the gravity carbs. So you'll have to balance between a pump that doesn't "put out" as much....and the float level for it to shut off properly....

If you already have a dual feed pingle, I would get two of the pumps that flow 14L per hour, put one on per side.
DF44-227 is the pump you want. It has one fuel inlet, one outlet...and one vacuum/pulse inlet line.
 

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QUOTE (Dave I. @ May 24 2008, 11:18 PM) index.php?act=findpost&pid=1037I have 39.5 pwks and have been thinking about running a pump. They are standard non pump style carbs. I have heard it can be done, but what needs to be changed? I have some interest in trying 1/4mile asphalt but mostly want to make sure I can make it up the mountain without issues. This is for an ALKY setup...

Thanks
Dave

Dave,

This is speaking from our 1/4 mile experience and another's using a non pump style 39 pwk. We have both ran the 1/4 with no pump on alky & gas. This is of course done with the dual pingle, modded gas cap and big bowls. Our 1st 400 passes were done with a 35L pump & we have over 100 passes with out. So, if you want a safety factor then go with a pump, but we have had no issues with no pump. We did notice a fuel curve difference between pump & no pump. It tends to be fatter/rich on the pump & the opposite with out. Bryan
 

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QUOTE (1700camaro @ May 25 2008, 07:48 AM) index.php?act=findpost&pid=1047Dave,

This is speaking from our 1/4 mile experience and another's using a non pump style 39 pwk. We have both ran the 1/4 with no pump on alky & gas. This is of course done with the dual pingle, modded gas cap and big bowls. Our 1st 400 passes were done with a 35L pump & we have over 100 passes with out. So, if you want a safety factor then go with a pump, but we have had no issues with no pump. We did notice a fuel curve difference between pump & no pump. It tends to be fatter/rich on the pump & the opposite with out. Bryan

Very nice info...thank you Bryan.
 

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QUOTE (1700camaro @ May 25 2008, 04:48 AM) index.php?act=findpost&pid=1047Dave,

This is speaking from our 1/4 mile experience and another's using a non pump style 39 pwk. We have both ran the 1/4 with no pump on alky & gas. This is of course done with the dual pingle, modded gas cap and big bowls. Our 1st 400 passes were done with a 35L pump & we have over 100 passes with out. So, if you want a safety factor then go with a pump, but we have had no issues with no pump. We did notice a fuel curve difference between pump & no pump. It tends to be fatter/rich on the pump & the opposite with out. Bryan


I wouldnt have said that.Last Time I said you can make the 1/8th Mile on gas with no billet bowls everyone bruttaly attacked me.But yes on gas you can make the 1/8 and 1/4 with no billet bowls or pump.PERSONALLY SEEN IT HAPPEND!

Dave from my buddys experience I wouldnt run the 1/4 mile on alky with no pump.I run the silver 35L pump that was around 35$ and its doing good.Even did an extra 60ft in the 1/4 mile and it was all good.I have some 39pwks Nate setup for me.With billet bowls.
 

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QUOTE (06banshee @ May 25 2008, 10:41 AM) index.php?act=findpost&pid=1055I wouldnt have said that.Last Time I said you can make the 1/8th Mile on gas with no billet bowls everyone bruttaly attacked me.But yes on gas you can make the 1/8 and 1/4 with no billet bowls or pump.PERSONALLY SEEN IT HAPPEND!

Dave from my buddys experience I wouldnt run the 1/4 mile on alky with no pump.I run the silver 35L pump that was around 35$ and its doing good.Even did an extra 60ft in the 1/4 mile and it was all good.I have some 39pwks Nate setup for me.With billet bowls.

No...what you said is you can run the 1/8 and 1/4 on gas with a big motor with a pingle only, no billet bowls, and you didn't say anything about a modded gas cap either.

We asked you to pay for his motor if there was any damage from taking your advice, and you declined...

If you notice 1700 camaro said with modded gas cap (remove check ball and drill the vent line), pingle and dual bowls.

However, he's running alky...and I don't remember the motor...

1700camaro...what size motor were you running the 1/8 and 1/4 on.

06, I'm not here to argue and bring this topic up all over... 1700's own words are a pump is extra insurance. And that was the final say over there...as well. You were just 100% positive you could do it without all of the extra bowls, pump, etc....on gas, just because you and your buddy did it, and you have a McCoy motor.

I'm not saying he'll 100% need all this, but as said...unless you run his exact motor at his exact location, how can you be so 100% sure he can get away with out it....
 

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The 2 quads that have been doing this is a 358 & 443 cubs that run mid - low 10s in the 1/4. As always, my opinion is just that and I don't preach it as gospel. What works for us is just that, take it or leave it.
 

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Discussion Starter #10
Thanks for the input guys. I bought a set of pump 39s lastnight on ebay also so Ill have options I guess. After talking to Bill, who rides the same place I do and has the same size motor, he recommended pump style carbs to make it up the hill without issue. Nate is doing my motor and my non pump carbs were setup by him, so Ill ask him about it also. I just wanted as many opinions as I could get, and this also makes for good tech info for the new site here.


Keep the good info coming, lets not argue about something that happened on a different site.


Dave
 

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QUOTE (Dave I. @ May 25 2008, 08:48 AM) index.php?act=findpost&pid=1062lets not argue about something that happened on a different site.


Dave

I think we are going to have some pretty spirited communications over hear. It's the nature of the screen names we have here and probably why we aren't on the other site.
 

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QUOTE (dajogejr @ May 25 2008, 07:19 AM) index.php?act=findpost&pid=1059No...what you said is you can run the 1/8 and 1/4 on gas with a big motor with a pingle only, no billet bowls, and you didn't say anything about a modded gas cap either.

We asked you to pay for his motor if there was any damage from taking your advice, and you declined...

If you notice 1700 camaro said with modded gas cap (remove check ball and drill the vent line), pingle and dual bowls.

However, he's running alky...and I don't remember the motor...

1700camaro...what size motor were you running the 1/8 and 1/4 on.

06, I'm not here to argue and bring this topic up all over... 1700's own words are a pump is extra insurance. And that was the final say over there...as well. You were just 100% positive you could do it without all of the extra bowls, pump, etc....on gas, just because you and your buddy did it, and you have a McCoy motor.

I'm not saying he'll 100% need all this, but as said...unless you run his exact motor at his exact location, how can you be so 100% sure he can get away with out it....

Ok whatever dave.Im not going to start a fight on this site.Your clearly the banshee god that knows everthing and has tried everything.Didnt you buddy run his bowls dry in 300ft on gas?thats just rediculous.And Ofcourse im not going to offer to pay for this guys motor.IDK where he lives or who he is.I wonder what all the hundred 1/4 mile gas bikes are doing that your not doing right.And I guess the modded gas cap is whats letting him do a extra 1/8th mile right?Common dont give me that BS.

And yes Nate McCoy did tell me I wouldnt need billet bowls for gas,And so did about 5 other people down here.(That have actually tried 1/4 mile)
 

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QUOTE (06banshee @ May 25 2008, 12:29 PM) index.php?act=findpost&pid=1072Ok whatever dave.Im not going to start a fight on this site.Your clearly the banshee god that knows everthing and has tried everything.Didnt you buddy run his bowls dry in 300ft on gas?thats just rediculous.And Ofcourse im not going to offer to pay for this guys motor.IDK where he lives or who he is.I wonder what all the hundred 1/4 mile gas bikes are doing that your not doing right.And I guess the modded gas cap is whats letting him do a extra 1/8th mile right?Common dont give me that BS.

And yes Nate McCoy did tell me I wouldnt need billet bowls for gas,And so did about 5 other people down here.(That have actually tried 1/4 mile)

And as I said on the other site...what works for you doesn't necessarily work for everyone. No matter what you're told or what you see.

All he was looking for is input and others opinion(s)....

And by the way, he is running alky and up a hill...which just might take a little more fuel, btw.

I'm not a god, not pretending to know it all, but I'm 100% certain I have more experience than you...actual, not what I've seen and heard.
 

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QUOTE (dajogejr @ May 25 2008, 08:55 AM) index.php?act=findpost&pid=1073And as I said on the other site...what works for you doesn't necessarily work for everyone. No matter what you're told or what you see.

All he was looking for is input and others opinion(s)....

And by the way, he is running alky and up a hill...which just might take a little more fuel, btw.

I'm not a god, not pretending to know it all, but I'm 100% certain I have more experience than you...actual, not what I've seen and heard.

so you have actual experience of running 1/8th mile on gas?And 1/4 mile on gas?And you tried it with pingel?And your buddy said at the end of the track.I dont think he meant uphill.

All Im going to say is you can make the 1/4 mile on gas with no billet bowls just a pingel.Yes billet bowls are good insurance.
 

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QUOTE (06banshee @ May 25 2008, 09:29 AM) index.php?act=findpost&pid=1072Ok whatever dave.Im not going to start a fight on this site.Your clearly the banshee god that knows everthing and has tried everything.Didnt you buddy run his bowls dry in 300ft on gas?thats just rediculous.And Ofcourse im not going to offer to pay for this guys motor.IDK where he lives or who he is.I wonder what all the hundred 1/4 mile gas bikes are doing that your not doing right.And I guess the modded gas cap is whats letting him do a extra 1/8th mile right?Common dont give me that BS.

And yes Nate McCoy did tell me I wouldnt need billet bowls for gas,And so did about 5 other people down here.(That have actually tried 1/4 mile)

Do you really think there are 100 1/4 mile quads? I think we would be lucky to have a 100 1/8 mile quads and 1/8 mile is the popular thing.

What are some of the results of the 1/4 mile times?

Bryan
 

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QUOTE (1700camaro @ May 25 2008, 10:17 AM) index.php?act=findpost&pid=1077Do you really think there are 100 1/4 mile quads? I think we would be lucky to have a 100 1/8 mile quads and 1/8 mile is the popular thing.

What are some of the results of the 1/4 mile times?

Bryan

street racing 1/4 mile bikes
 

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QUOTE (1700camaro @ May 25 2008, 01:07 PM) index.php?act=findpost&pid=108406, You guys ever make it to the Wicked Motorsports events in GA. & FL.? I think you are from FL., right.

Well be there for the next event.My bike wasnt ready for there last race in GA that was in October I think.Im in miami.There ALOT of 1/4 mile bikes tho no lie.
 

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QUOTE (06banshee @ May 25 2008, 01:15 PM) index.php?act=findpost&pid=1085Well be there for the next event.My bike wasnt ready for there last race in GA that was in October I think.Im in miami.There ALOT of 1/4 mile bikes tho no lie.

We have the Wicked event on the schedule, but sure don't know about them gas prices. It's a 4,000 mile trip for us!
 

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QUOTE (1700camaro @ May 25 2008, 01:48 PM) index.php?act=findpost&pid=1090We have the Wicked event on the schedule, but sure don't know about them gas prices. It's a 4,000 mile trip for us!

Its crazy 4.79 for diesel.Luckily for me were we race and tune is about 5 minutes from my house.
 
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