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Unread 07-23-2012, 06:09 PM   #51
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Default Re: carb tuning VanGuard 23

Quote:
Originally Posted by Maxster View Post
CC-John,
I am in the process of removing my carb so I can knock out the soft plugs so I can adjust it. How do I know if I have an adjustable crab?
Sorry Maxster, just could resist......Crabs aren't adjustable....just good eating
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Unread 07-23-2012, 06:28 PM   #52
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Default Re: carb tuning VanGuard 23

Nice, guess I will order a new one. Thanks
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Unread 07-23-2012, 08:58 PM   #53
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Default Re: carb tuning VanGuard 23

Maxter, don't be so hard on Smallblock!!!! Not everyone can master dual mukini's..... here's the PN for the adjustable carb from CCJohn-
The Briggs part# for the early style carburetor is: 808626

You will still need to do a lot of work to make it right, cutting a "balance channel" is the first mod to do, buying some different jets or having an indexed drill bit set will also help, and you should already have the final air filter system/ exhaust system that you are going to use. Buy the NGK iridium plugs, then start playing with the jetting, or I suggest you just call EC carbs with all your engine/ intake info and let them do their magic on one of their carbs, wish I would have a long time ago...
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Unread 08-01-2012, 07:31 AM   #54
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Thumbs up Re: carb tuning VanGuard 23

[QUOTE=Flintrock;753838]Maxter, don't be so hard on Smallblock!!!! Not everyone can master dual mukini's..... here's the PN for the adjustable carb from CCJohn-
The Briggs part# for the early style carburetor is: 808626

*The 30mm carb off the 35hp 61" engine works really well on my 23hp 38" Briggs, so grateful for the tip off on here; it has had a few part number changes though. It makes a real difference in power and bolts straight on providing you open up the alloy elbow to clear the butterflies, took five minutes with an olive shaped rotary cutter.

I tried joining up the inlets but there were too many bad effects, Briggs keep them seperate for a reason and EC carbs confirmed by email that while the open spacer is good at raising power it will never run right until the carb throats are sealed off from each other. What was nice about EC Carbs was that they don't supply to the UK but still gave advice.

The best carb supplier I found is a guy called Nate Horsfall, one mixture screw was knocked in the parcel and he was really quick at replacing it free of charge, no quibbling.

Here's what Nate wrote when asked about part numbers:-

"I can tell you that part # 845032 and part # 844172 are both now part #
845273 and the carb is $197.90 (USD). Please let me know how many you'd want to order and I can quote shipping.

Sincerely,

Nate Horsfall
IT / Internet Supervisor
Sohar's / RCPW
600 Highland Road E
Macedonia, OH 44056
(330) 467-1332, Ext. 122 (local/international)
(800) 937-7279 (USA toll-free)
(330) 468-2426 (fax)
www.rcpw.com"

Cheers

Kevin Armstrong
UK
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Unread 09-19-2012, 09:02 AM   #55
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Default Re: carb tuning VanGuard 23

Update from a UK tuner

Using the 38"/23hp engine in an ultralight; proof of the pudding is that the Rotax two stroker engine it came with made 39hp at 6,500rpm, and my tuned Briggs now makes it fly almost the same, so probable 35 hp genuine at just 4500rpm, runs cool as well.

Lots of the tuning info came from this site and similar such as Heymow, so I'm really grateful to the folk who post on here to help and advise others just starting out, as I was.

The 35hp 61" carb number #845273 bolted straight onto the 23hp manifold and went well after a little opening up of the elbow to clear the butterflies, only hassle is I need maximum gas mileage to get best range, no gas stations in the sky! Best price for the carb was Nate at RCPW.

Lots of power but it ran a little rich so I bought a 5000 high altitude jet kit, part numbers given by the USA Briggs distributor were #842095 and #84209. This was frustrating, as the original jet sizes were stamped 158 and 152 BUT when the high altitude jets arrived they had no numbers on them. Added the jets and it ran really well, with smoother running and even better power, so it must have been running way too rich. Still a little rich but as head temps are low it now can go even leaner and cleaner.

What I need to do now is suss what size the #842095 and #842096 high altitude jets are, and go a size smaller, anyone know?

Kev

PS here's the test flight across the English Channel to France


And here's a view of the engine running sweeter

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Unread 09-19-2012, 11:09 AM   #56
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Default Re: carb tuning VanGuard 23

It is very cool, I just watched several of your videos..

I have to tell you I have a cousin who survived an accident with an airboat
engine/propeller , I work in health care. He has twelve inches of lamb's bone in one leg, and ..well..I just cringed over and over ..

Just be careful, my brother owns a Grumman A1 , is it.. ? I don't keep up
with it, but seriously..just stay away from the prop.
You really don't ever want to bump it.
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Unread 09-19-2012, 01:24 PM   #57
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Default Re: carb tuning VanGuard 23

Quote:
Originally Posted by csason View Post
It is very cool, I just watched several of your videos..

I have to tell you I have a cousin who survived an accident with an airboat
engine/propeller , I work in health care. He has twelve inches of lamb's bone in one leg, and ..well..I just cringed over and over ..

Just be careful, my brother owns a Grumman A1 , is it.. ? I don't keep up
with it, but seriously..just stay away from the prop.
You really don't ever want to bump it.
*Thanks Buddy, we are obliged to have a licence for FAR103 flyers in the UK, this means fully trained and pass exams etc, unlike FAR103 pilots in the US, so have less of that type of accident; the benefit to tuners on Buggies and so on of discussing tuning the 38" is that an aircraft is a really strict machine to fit a motor to, has to be light and reliable, but you are less fussed than we UK folk are about Gasoline costs. Al Hodge provided most of the upgrades and I'm very happy with his products, he does miss telling you key details though, such as the higher torque for the Racing ARP conrod bolts, and the fact that the valve clearances should be 0.012" and 0.018" set hot with his cam rather than the 0.006" standard setting.

What is handy to Buggy fams is the low cost of fitting the 61" / 35hp/30mm carb to raise power, under $197 or less. I had some terrific advice (free) from E.C. carbs who don't even sell into the UK but were happy to mail over information, that tells you what sort of good people they are. I did wonder if this is why the mudboat tuners and so on never mention the 2x30mm choke carb, as then they'd sell less Mikunis....

E.C. carbs were VERY specific about one key thing; do not join the inlets, keep them separate and it will run right. they are right as I found. Joining up inlets is a cheap way to gain power but it harms the running and maybe the motor too.

So....what do those jets sizes mean? and can I buy a smaller set than the 152 and 158 stock sizes, to eke out the limited tankage and reduce the carbon I'm getting in the oil?

Cheers

Kev
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