Running carbs pumpside in?

[yamanube]

My buddy is building his LPW 760 and Paul told him to run the carbs pumpside in. He says they perform better that way, anybody else heard of this? Run them this way? What is the benifit?
*if you put your ear to the ground you can hear the dyno joke bandwagon

 

[WaterX117]

Good question, I would like to see the answer to this as well.

 

[Mark44]

I will have to check the Dyno sheets........O did I say that?

I joke I joke!

Mark44

 

[yamanube]

Okay, now let's try to get an answer from somebody who's not a complete retard.

 

[#ZERO]

Are you sure it wasn't pump side out because that's what he tells most people.

 

[yamanube]

Are you sure it wasn't pump side out because that's what he tells most people.

That's what my buddy said, pump out is the standard mounting orientation.

 

[Mark44]

p

I would suggest you read a Mikuni manual so you can tell the difference between the pump side and diaphragm side.....retard!
LOL.

Mark44

 

[#ZERO]

They're supposed to be a performance advantage running them with the pump side out because of the higher intake manifold signal in that direction.

That's why the Yamaha OEM 44s are mounted that way with the throttle cable at the rear.

Some people mount them backwards so they can access the diaphragm cover without removing the whole assembly.

 

[yamanube]

I would suggest you read a Mikuni manual so you can tell the difference between the pump side and diaphragm side.....retard!
LOL.

Mark44

Yeah I guess, I havent seen a complete engine for 5 months...cabin fever, my mistake. Either way your hilarious jokes dont answer my question.
What is the benifit?

They're supposed to be a performance advantage running them with the pump side out because of the higher intake manifold signal in that direction.

That's why the Yamaha OEM 44s are mounted that way with the throttle cable at the rear.

Some people mount them backwards so they can access the diaphragm cover without removing the whole assembly.

thank you, now I kind of remember seeing something on this, but it didnt make sense to me why turning the carbs 180 degrees would increase the signal

 

[Big Kahuna]

I think there is an article on Group K about this........ has to do with left turn syndrome...

I run my Team Scream 44's this way. Also the boyesan manifold is setup to run the carbs this way also......

 

[Scorn800]

I would suggest you read a Mikuni manual so you can tell the difference between the pump side and diaphragm side.....retard!
LOL.

Mark44

lol:bigok:

 

[crammit442]

I think there is an article on Group K about this........ has to do with left turn syndrome...

I run my Team Scream 44's this way. Also the boyesan manifold is setup to run the carbs this way also......

The REAL reason We(standups riders) normally run them pump side out is that there is a very real chance of blocking the vent to atmosphere hole with the rear exhaust hose if they're run in the pump side in orientation. Standups aren't capable of turning hard enough to experience much of the left turn issues that runabouts face. The cure for that is not turning them around, but turning them 90 degrees. There. Make sense?:thinking:

 

[Mouthfulloflake]

so on a standup they can basically function either way ( as long as the vent hole isnt blocked)?

that might make my throttle cable scenario a bit better.

 

[SuperJETT]

The REAL reason We(standups riders) normally run them pump side out is that there is a very real chance of blocking the vent to atmosphere hole with the rear exhaust hose if they're run in the pump side in orientation. Standups aren't capable of turning hard enough to experience much of the left turn issues that runabouts face. The cure for that is not turning them around, but turning them 90 degrees. There. Make sense?:thinking:

Plus when we're turning, the ski is leaning so that effect is minimized anyway. Sitdowns turn fairly flat so there is a lot of side load.

 

[Big Kahuna]

Team Scream, Riva and Novi take this into account so it is not an issue with the hole being covered by the hose.

 

[#ZERO]

Team Scream, Riva and Novi take this into account so it is not an issue with the hole being covered by the hose.

I noticed that they put more holes in the cover plates, so the diaphragm reacts faster.

 

[Mouthfulloflake]

very interesting #0.

any one got pics of that?

 

[yamanube]

very interesting #0.

any one got pics of that?

Riva:

 

[#ZERO]

Full Spectrum just drills another hole at the top the same diameter as the bottom hole.

Hot products offers a billet aluminum cover that only uses two allen bolts with few more holes.

 

[SUPERTUNE]

Dang you guys giving out all our secrets!!! Shhhh....