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slammed70bug
Samba Member
Joined: August 30, 2010
Posts: 85
Location: Pittsburg KS
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 Posted: Sat Apr 19, 2014 4:56 pm Post subject: Top end problem! |
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I have an 1835 with the 110 cam big valves and heads. I just recently put dual weber 44s on my buggy. I was told to switch out the venturis from 36mm to 32mm and my jets are 200 Air, 145 Main, and 60 Idle, F11 tubes. My problem is i am not having good top end. My buggy is topping out around 80 mph on the highway. Should i change the venturis back to 36mm or is there something else i should do. I am wanting to be able to have good low end and top end.
What is the real difference in changing out venturis.
Some one please help!! |
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Danwvw
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Joined: July 31, 2012
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Location: Oregon Coast
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[email protected]
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Joined: August 03, 2002
Posts: 12785
Location: Salt Lake City, Utah
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| Posted: Sat Apr 19, 2014 6:07 pm Post subject: Re: Top end problem! |
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55 idle and 130 mains. 145s are way too rich and putting the fire out.
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vwracerdave
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Joined: November 11, 2004
Posts: 15308
Location: Deep in the 405
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| Posted: Sat Apr 19, 2014 6:12 pm Post subject: |
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What size rear tires and what transaxle gearing?
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slammed70bug
Samba Member
Joined: August 30, 2010
Posts: 85
Location: Pittsburg KS
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| Posted: Sat Apr 19, 2014 6:58 pm Post subject: |
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| 195/50r15 is the tire size and I'm running a car trans. Aaron from CB Performance told me I needed my carbs setup that way. But I just don't have the top end like I did when I had the single Weber carb on it. |
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vwracerdave
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Joined: November 11, 2004
Posts: 15308
Location: Deep in the 405
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| Posted: Sat Apr 19, 2014 7:34 pm Post subject: |
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Try 130 mains. CB always jets fat.
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modok
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Joined: October 30, 2009
Posts: 26787
Location: Colorado Springs
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| Posted: Sat Apr 19, 2014 7:41 pm Post subject: Re: Top end problem! |
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| slammed70bug wrote: |
| I was told to switch out the venturis from 36mm to 32mm |
venturi size and main jet size need to match.
when you put in smaller venturis you should have put in smaller main jets, probably 130.
try 130 main with 200 air, or preferably 125 main and 180 air |
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esde
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Joined: October 20, 2007
Posts: 5969
Location: central rust belt
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| Posted: Sat Apr 19, 2014 8:27 pm Post subject: |
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| vwracerdave wrote: |
| CB always jets fat. |
plugs are cheaper than pistons. |
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[email protected]
Samba Member
Joined: August 03, 2002
Posts: 12785
Location: Salt Lake City, Utah
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| Posted: Sat Apr 19, 2014 8:40 pm Post subject: |
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like the P&C set you have to replace because you washed all the oil off of them with all that extra fuel?
| esde wrote: |
plugs are cheaper than pistons. |
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Splitdog
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Joined: February 16, 2004
Posts: 4125
Location: Planet VW
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| Posted: Sat Apr 19, 2014 9:41 pm Post subject: |
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Why would you have oil on your pistons?
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blue77bay
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Joined: February 11, 2006
Posts: 631
Location: Brisvegas Australia
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| Posted: Sat Apr 19, 2014 10:26 pm Post subject: |
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Why would you have oil on your pistons?
-----so they dont seize! its not a lot but its there !
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Splitdog
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Joined: February 16, 2004
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Location: Planet VW
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| Posted: Sat Apr 19, 2014 11:26 pm Post subject: |
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If you have oil in the combustion chamber, you have a problem somewhere. 
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Cptn. Calzone
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Joined: June 27, 2007
Posts: 1855
Location: S>E>Alabama
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| Posted: Sun Apr 20, 2014 3:43 am Post subject: oil |
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Pig rich will wash down the cylinder and result in accelerated wear/scoring.Anyone knows ya gotta have lube in a hole
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75smith
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Joined: July 09, 2011
Posts: 2275
Location: NH
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| Posted: Sun Apr 20, 2014 4:24 am Post subject: |
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| Splitdog wrote: |
| If you have oil in the combustion chamber, you have a problem somewhere. |
the other side of the piston gets squirted with oil, and the piston oil control ring keeps it from entering the chamber
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slammed70bug
Samba Member
Joined: August 30, 2010
Posts: 85
Location: Pittsburg KS
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| Posted: Sun Apr 20, 2014 6:08 am Post subject: |
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| So should I change out the jets or should I switch back to the 36mm vents and try that. |
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MURZI
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Joined: August 25, 2005
Posts: 5063
Location: Madisonville, La
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| Posted: Sun Apr 20, 2014 6:26 am Post subject: |
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I have a 1835 w110 and 44's....runs like a raped ape....top and bottom. It's in the tuning. I am at 52/145/190. Drop your idles, and stick those 36's back in.
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vwracerdave
Samba Member
Joined: November 11, 2004
Posts: 15308
Location: Deep in the 405
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| Posted: Sun Apr 20, 2014 6:37 am Post subject: |
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Leave the 32mm venturies and try the smaller 130 main jet, 200 air and 55 idle.
The dual 44 IDF's with 36mm venturies are too big for your engine. Putting 32mm venturies in them wil get them very close but not perfect. What you really need are some dual 40 IDF's with 32mm venturies. Yes folks there is a difference between 40 IDF's with 32mm venturies and 44 IDF's with 32mm venturies.
Everybody is focused on jetting when you might have too tall a gear. What transaxle do you have? There is a very large difference between a 6 volt swingaxle with a 4.37 R&P gear and a single side cover IRS trans with a 3.88 R&P gear that somebody installed a .82 4th gear freeway flyer transaxle.
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2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
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esde
Samba Member
Joined: October 20, 2007
Posts: 5969
Location: central rust belt
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| Posted: Sun Apr 20, 2014 6:51 am Post subject: |
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| [email protected] wrote: |
like the P&C set you have to replace because you washed all the oil off of them with all that extra fuel?
| esde wrote: |
plugs are cheaper than pistons. |
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I guess my sarcasm is lost without one of the little rolling eyes faces, eh? |
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mark tucker
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Joined: April 08, 2009
Posts: 23937
Location: SHALIMAR ,FLORIDA
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| Posted: Sun Apr 20, 2014 10:09 am Post subject: |
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| the 36 vents with 145~155 MAINS&200 AIRS shoud run just fine with 30 degrees of total timing @2200~2500 rpm. and a good dist. and good exhaust,engine built right cam degreed right.good fuel pump.good filters(top not to close to the stacks)good plug wires. |
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Danwvw
Samba Member
Joined: July 31, 2012
Posts: 8892
Location: Oregon Coast
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| Posted: Sun Apr 20, 2014 10:28 am Post subject: |
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Those tires gear it down a little so 80mph may be about 4000 rpm but it should not loose torque not even at 5000. I would think your engine would pull to 6000 RPM nicely with the smaller Venturi's! 1835cc is still basically a 1600 motor It must not be able to handle all that carburetion, it must not have the lung capacity to keep the flow high enough to bring in the main jets and at 80 mph they may be needed and still don't come in or start to come in and they are throwing the mixture way off. I am just speculating here but it sounds logical to me.
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