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bulladean_
Joined: Fri May 04, 2012 1:55 pm Posts: 128
Vehicle: tin top sj70
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 Posted: Wed Mar 27, 2013 5:39 pm |
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Hey guys just got a new motor g13ab and it has no Carby. I put my old carby but its had it. I've looked at the 32/36 but I like drive big angles so that's not going to work so im thinking the 38/38 but it seems not many people have run them. Few questions on eBay the is a kit for a samuria but the year is older than my 94 sierra. How's the flooding and starving. Last question how's the power because I tow a small boat sometimes
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Rhinoman
Joined: Mon May 16, 2011 7:03 pm Posts: 686 Location: Brinkworth, England
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Posted: Thu Mar 28, 2013 7:20 am |
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I would expect the 38/38 to be too big for a Samurai, if its the one I think it is then its also a synchronous carb so the pickup wouldn't be so good.
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Rhinoman
Joined: Mon May 16, 2011 7:03 pm Posts: 686 Location: Brinkworth, England
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Posted: Thu Mar 28, 2013 7:25 am |
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The new 32/36 is a slightly different design to avoid the stalling that the old carb suffered from, I've no idea how to tell them apart though.
Edit: The overflow from the float bowl now goes to a tube that is supposed to be plumbed into the charcoal canister.
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bulladean_
Joined: Fri May 04, 2012 1:55 pm Posts: 128
Vehicle: tin top sj70
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Posted: Thu Mar 28, 2013 8:29 am |
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Do you know where to get the new 32\36 ? How do you tell them from the old
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JrZook
Joined: Tue Aug 08, 2006 11:30 pm Posts: 5517 Location: Holland Park
Vehicle: Awesome!!
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Posted: Thu Mar 28, 2013 11:41 am |
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The 38/38 is a similar casting to the 32/36 so the float bowl mods should be able to be transferred across. Rhinoman is correct, it is a synchronous carb (both butterfly's open simultaneously) so with the 1.3 and poor intake design you could experience some lag if you quickly nail the throttle from idle to WOT. Apart from that it will give quite a power boost over the 32/36.
These downdraft webers will never run on huge angles due to the way they have been designed. You can improve their susceptibility to angles with the float bowl mods but it still wont run near the angles the stock carb can.
Ultimate power upgrade that will be good on angles and response are quad motorcycle CV carbs although this requires quite a bit of fab work
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Rhinoman
Joined: Mon May 16, 2011 7:03 pm Posts: 686 Location: Brinkworth, England
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Posted: Thu Mar 28, 2013 6:03 pm |
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The float bowl mods are only for the old carb design, I can't find any info on it now but I think that the new carbs may also have split floats, like a motorcycle, on improve the performance at higher lean angles.
The 32/36 is already considerably bigger than a stock 1.3 carb and without significant mods to the intake I doubt that you'd see any power boost on a 1.3, they are usually sold for the 1.6
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JrZook
Joined: Tue Aug 08, 2006 11:30 pm Posts: 5517 Location: Holland Park
Vehicle: Awesome!!
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Posted: Thu Mar 28, 2013 7:38 pm |
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The actual problem is where the main jets and emulsion tubes are situated in reference to the fuel bowl. IF you have a carb with a full bowl and tip it as it would see going up or down a steep incline you will find that the fuel becomes force fed/starved by gravity which enters the throats without any vacuum required.
On my 1.3 with the 32/36 and a vac gauge hanging off it you could start to see the manifold vacuum creep back from 0in-hg at low rpms WOT to around ~1in-hg at 5k RPM + WOT. Left me wondering how well the 38/38 would have gone as it almost seemed like the carb was still a restriction up top.
If a progressive 38/38 was out that would be definitely worth a try.
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bulladean_
Joined: Fri May 04, 2012 1:55 pm Posts: 128
Vehicle: tin top sj70
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Posted: Thu Mar 28, 2013 7:51 pm |
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I'm gonna get the 38 a run and see how we go. Anyone got an idea on how the electronic choke works. I'm thinkin of buying the manual converstion
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Rhinoman
Joined: Mon May 16, 2011 7:03 pm Posts: 686 Location: Brinkworth, England
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Posted: Thu Mar 28, 2013 9:10 pm |
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JrZook wrote: The actual problem is where the main jets and emulsion tubes are situated in reference to the fuel bowl. IF you have a carb with a full bowl and tip it as it would see going up or down a steep incline you will find that the fuel becomes force fed/starved by gravity which enters the throats without any vacuum required.
On my 1.3 with the 32/36 and a vac gauge hanging off it you could start to see the manifold vacuum creep back from 0in-hg at low rpms WOT to around ~1in-hg at 5k RPM + WOT. Left me wondering how well the 38/38 would have gone as it almost seemed like the carb was still a restriction up top.
If a progressive 38/38 was out that would be definitely worth a try. As I understand it thats what happened on the old carb because the fuel would overflow into the throats, on the new version the overflow now goes to an external pipe which diverts it to the charcoal canister. The design was changed a year or two back to fix this issue, some places still seem to be shifting stock of the old model though. The stock manifold restricts the airflow before the carb peaks, I had a look on eBay but I didn't see a link for a 38/38 kit for a 1.3.
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