Might go single

[D-Roc]

does it matter which way the single carb is installed? fuel pump close to the hull so you can use the stock kawi cable keeper, or if you have the aftermarket one would it matter if it had the fuel pump side of the carb close to the motorl, so the throttle cable has more length? i had it setup so that the pump side was to the motor but turned it around today and haven't tried it. just wondering if there is a true way to have it.

 

[Matt_E]

It doesn't matter which way a single is turned, you can use the shorter cable either way.

If you have a shortened pole, you can use a short cable on duals either way, too.

 

[D-Roc]

okay cool i think i'll switch it back cause it was a little cleaner and gave more room to tuck the throttle cable away.

 

[T-bone]

i think a single on x cases will always work good, the only problem i have had with a single on t cases is a gernade.......granted it took a couple of seasons. i had a single 46 on t cases and thought about going to a 48 but after the thing went pow i relized that a single on that set up will never deliver the fuel to keep up on the top. im going back to a single 44 so it will pull in a little less air.

 

[WaveDemon]

i think a single on x cases will always work good, the only problem i have had with a single on t cases is a gernade.......granted it took a couple of seasons. i had a single 46 on t cases and thought about going to a 48 but after the thing went pow i relized that a single on that set up will never deliver the fuel to keep up on the top. im going back to a single 44 so it will pull in a little less air.

Why would a t case 701 need more carburation than an x case 701. makes no sense to me. I can see how the t could make more power through better flow but I don't see how it would requier more fuel.

besides, you said it worked for a few seasons. I think you had another problem.

 

[T-bone]

no i just never ran wide open for any leanth of time.....short bursts, loaned it out and it was run wide open for a long streach and ...............pow. there are several engine builders that will tell you if you run a single on t cases dont run wide open.


i would think since the t cases flow air more than x caes thay would need more fuel or you would run super lean.

 

[Matt_E]

I wonder if an external high-volume fuel pump would solve this problem.

 

[Matt_E]

Wanna sell it?

 

[WaveDemon]

no i just never ran wide open for any leanth of time.....short bursts, loaned it out and it was run wide open for a long streach and ...............pow. there are several engine builders that will tell you if you run a single on t cases dont run wide open.


i would think since the t cases flow air more than x caes thay would need more fuel or you would run super lean.

That's not how a carb works. The throat on a stock carb will only allow in so much air. the fuel circuits on a stock carb can out flow the throat.

 

[Matt_E]

Aftermarket carbs may be different, with modified fuel circuits and all.

 

[WaveDemon]

Aftermarket carbs may be different, with modified fuel circuits and all.

I agree, even worse is a carb with stock fuel cicuits and a bigger throat.

 

[Matt_E]

Take the Novi for example....supposedly, the high speed circuit is made longer - that would drop it's fuel pressure.
I imagine it can indeed flow less than a stocker, especially if it started life as a 44SBN, was made into a 48 (flows more air), and the fuel circuit is made more restrictive.

 

[Matt_E]

umm.. no.. :biggrin: :cool2:

:banghead: :biggthumpup: :sneaky:

 

[Takeastand SJ]

An external fuel pump and correct size return line restrictor puts a higher fuel pressure in the carb, allowing it to supply more fuel when jetted correctly.

 

[Matt_E]

You were saying your buddy runs a ported stroker on a single 48 powerbomb, right?
WOT at all?

How has your fuel consumption changed since switching from dual 44's to a single 48?

 

[SuperJETT]

I ran a single 48 Novi, with Mikuni's biggest external fuel pump, and even with the main jet COMPLETELY REMOVED it would not flow enough fuel at wot to richen up.

It ran great, but wot was dangerous for more than a few seconds.

The internal fuel path is different from stock, which changes how it reacts.

 

[Matt_E]

Is this a problem common to all singles on T cases, or just some?
What if you threw a 49FS on there?

 

[WaveDemon]

Take the Novi for example....supposedly, the high speed circuit is made longer - that would drop it's fuel pressure.
I imagine it can indeed flow less than a stocker, especially if it started life as a 44SBN, was made into a 48 (flows more air), and the fuel circuit is made more restrictive.

on the opposite side of this example, You should be able to run a single stock 38 on a 701 as long as it's tuned for that motor. The carb may not give you much power because it's so small but it shouldn't lean out a motor.

 

[WaveDemon]

the motor i sold to stricky that he sold to idok was a 62t case motor and i had a single 46mm carb on there. if i ran it WOT for more than 5 or so seconds, you could feel it starting to lean out, drop rpm, and get ready to go bye bye

I thought it was a single tlr 48.

 

[WaveDemon]

no, i never had my tlr single 48 on that motor.. that was a 46mm i borrowed from rotaxgrenade while todd was making my 48 for me. when i got the 48 back from todd i let rotaxgrenade have first crack at it since i had his 46mm carb for so long (plus his 46mm was already jetted/tuned for my boat).. and he was actually rebuilding his duals at the time, so it worked out for everyone.. i had "a few" 48mm carbs... ;-)

then why in the hell did Idok tell me that? did you sell chick a 48 carb that made it's way to idok? maybe he has one and I was confusing them???