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Author Topic: Zen 30/31  (Read 2424 times)

Brigadair

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Zen 30/31
« on: September 14, 2014, 08:21:10 PM »

1048 walbro carb needle settings?

Just wondered what people  used and thought best?

H 1 and 1/8th, low 1 and 3/4?

Or

H 1 and 3/4, low 1 and 1/2??

Or somewhere I between?

I realise settings depend on many factors, pipes, pipe lengths, props, etc etc.

Just wondered if any favoured settings?
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craig dickson

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Re: Zen 30/31
« Reply #1 on: September 14, 2014, 08:59:16 PM »

Hi Garry


When I bought my Zenoahs from Dave Marles, both the stock engine and his tuned Zen 7 (old hat now perhaps), his recommended settings were richer on the idle needle and leaner on the high  speed needle. His recommended settings proved bullet proof throughout the throttling process.


I can not comment on the latest tuned engines and bigger bore carbs. I guess it is down to trial and error unless folks are willing to share key experiences %%


Craig
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Brigadair

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Re: Zen 30/31
« Reply #2 on: September 14, 2014, 09:00:48 PM »

Thanks Craig.

What setting do you run on low and high needle?
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MPM

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Re: Zen 30/31
« Reply #3 on: September 14, 2014, 09:42:17 PM »

Stock setting was H 1 3/8 low 1 1/2
Im running H 1 1/2 and L 1 1/2

The 1048 carb has alot of settings that work... Look at car forums and they are different again.

i found i kept getting a bog on Low when the High jet was rich.

Jack

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Re: Zen 30/31
« Reply #4 on: September 15, 2014, 08:08:40 AM »

during sunday my settings on K30 were
H 1 1/2
L1 1/2 


changed it to
H 1 1/4
L  1 1/2

This will probably change again with abit more fine tuning to do and also modded the air intake into hull ;)
 
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black magic racing

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Re: Zen 30/31
« Reply #5 on: September 15, 2014, 05:58:56 PM »

2 on the low and 1 on the high :-)) if it bogs down on low revs go and 1/8th of a turn in on the low but please remember to go an 1/8th of a turn out on the high,,,,,, :-)) :-))
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Den W

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Re: Zen 30/31
« Reply #6 on: September 15, 2014, 06:27:42 PM »

Magic No. is (3) like Kurt suggests but you have to find the combo............for me its 1.1/4H x1.3/4L useing Walbro 257 std carb... you could try the WYK 33. now thats a different ball game..and a lot better .....JMHO
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craig dickson

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Re: Zen 30/31
« Reply #7 on: September 16, 2014, 07:32:09 PM »

Thanks Craig.

What setting do you run on low and high needle?


Hi Garry
Sorry for not replying sooner. My settings are Low Needle 1 and 3/4, High Needle 1 and 1/8. However bearing in mind that I am running the smaller capacity Zen7, with modded Walbro 257 carb and submerged drive, I suspect my information will be about as much use as a chocolate fire guard! {:-{


The comments from others have been very helpful and interesting to read. Thank you to all of you :-))


Craig



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Brigadair

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Re: Zen 30/31
« Reply #8 on: September 16, 2014, 08:24:56 PM »

Hi all


Thanks for your honest replies on carb settings.


I'll add that lot into e mix soon. Your advice appreciated,


One thing that is apparent is that the 1048 carb is quite a flexible bit of kit, in more ways than one.


Hope to see as many of you as possible for a great racing venue at Leicester this Sunday.


Cheers
Garry
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Brigadair

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Re: Zen 30/31
« Reply #9 on: September 26, 2014, 09:16:36 PM »

And yes what a great day it was at Leicester!!! See BMPRS.CO.UK for full results and pics!
Garry
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