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Good starting place on jets
http://www.woodsbuggy.com/phpBB3/viewtopic.php?f=3&t=6214		 Page 1 of 1
Author:  Kyle [ Thu Apr 02, 2009 9:13 am ]
Post subject:  Good starting place on jets
2276 with VZ 15 cam, 044 heads. dual 44's

Right now we have

55 Idles
140 Mains
200 ac's
F7 Tubes
Author:  hyde [ Thu Apr 02, 2009 5:22 pm ]
Post subject:  Re: Good starting place on jets
Looks good maybe 150 or 155 mains well run cooler in new engine
Author:  chris38375 [ Thu Apr 02, 2009 9:38 pm ]
Post subject:  Re: Good starting place on jets
ive always started out
55 idles
135 mains
175 air
f7 or f11
and the pump valve should be a 0
the valve in the bottom of a weber
Author:  perrib [ Wed Apr 15, 2009 2:10 am ]
Post subject:  Re: Good starting place on jets
Something I was once told.
Venturis are usually 2-6 mm smaller than the intake valve size.The smaller venturi the more bottom end torque.
Fuel pressure is critical. 2.5 psi.
Float level 10-11 mm. Start with 10.5 mm
Emulsion tubes F-11 are the most popular
Idle jets 1.6xs the size of the venturi.
Mains 4.1-4.3 xs the size of the venturi. a little rich is better than too lean.
Air 1-2 sizes larger than the main
1500 -2000 rpms is controlled by the idle circuit
2000-3000 is fed by the idles and the mains
idle jet size and float level are what you use to tune this rpm range.
3000-4000 is fed from the mains
4000-5000 from the mains and airs
acc pump jet use the smallest you can and still accerate. Adjusting the rod can make a significant change.

It seems to work ok for most engines with snmall to medium sized valves.

How hard does the VZ 15 cam pull in your engine? I have only used it in a 1776 to 1915 engines and liked it. I want to try one in a 2386 I am building for someone.
Author:  Kyle [ Wed Apr 15, 2009 3:32 am ]
Post subject:  Re: Good starting place on jets
thats actually a buddies engine. we ended up with

55 Idles
175 AC
135 Mains
F7 Tubes

Thanks Chris on the 135's just about where it needs to be.

I also run the VZ15 on my 2332. I ran a 14 last year, I have not really had a chance to run the new motor much so can't comment yet but the couple times I called on power there was no lack. In my motor right now I have

55/200/145/F7's 110 Race Fuel 100%
Author:  chris38375 [ Wed Apr 15, 2009 7:01 am ]
Post subject:  Re: Good starting place on jets
i ended up changing my idles to 47 and my mains to 150 it was loading up on the bottom endso i went a little smaller on my idles
Author:  Odyknuck [ Wed Apr 15, 2009 9:32 am ]
Post subject:  Re: Good starting place on jets
That combo does not sound right. 47s are really lean. Is it possiable that your mains are to rich and you had to compensate with the smaller Idels?

chris38375 wrote:
i ended up changing my idles to 47 and my mains to 150 it was loading up on the bottom endso i went a little smaller on my idles
Author:  perrib [ Wed Apr 15, 2009 12:26 pm ]
Post subject:  Re: Good starting place on jets
Have you double checked fuel pressure and the float levels?
Author:  chris38375 [ Wed Apr 15, 2009 3:26 pm ]
Post subject:  Re: Good starting place on jets
i had 50 idle jets in itwent to 47 and it runs perfect,im not gonna change it back to 50 because it would load up a little,idling up a steep hill
Author:  Roy [ Wed Apr 15, 2009 7:12 pm ]
Post subject:  Re: Good starting place on jets
If you feel it's perfect, it probably is. :wink:
Author:  perrib [ Fri Apr 17, 2009 9:43 pm ]
Post subject:  Re: Good starting place on jets
Hey Kyle

what have you found out?
Author:  mikey w [ Sat Apr 18, 2009 2:26 am ]
Post subject:  Re: Good starting place on jets
wish i could idle up a steep hill, that's got to be alot of fun :D :D
Author:  Kyle [ Sat Apr 18, 2009 8:42 am ]
Post subject:  Re: Good starting place on jets
perrib wrote:
Hey Kyle

what have you found out?


eh? mine is perfect. I think you guys were talking to Chris about the 47 :)
Author:  perrib [ Sat Apr 18, 2009 7:10 pm ]
Post subject:  Re: Good starting place on jets
Kyle wrote:
perrib wrote:
Hey Kyle

what have you found out?


eh? mine is perfect. I think you guys were talking to Chris about the 47 :)


For some reason I thought you were asking for jetting help not stating a good place to start.

In that case how do you like the cam in the 2332?. I want to build a 2386 with a VZ 15 cam. I know how it runs in an 1835. Does it still pull hard at 4000-5000 rpm with the larger 2332 displacement?
Author:  Roy [ Sat Apr 18, 2009 7:21 pm ]
Post subject:  Re: Good starting place on jets
In my opinion the VZ-15 cam works better in a smaller displacement motor. There are other choices that work better in the larger motors. The FK and W series. 1.4 Rockers are a must to take full advantage.
Author:  Kyle [ Sat Apr 18, 2009 11:01 pm ]
Post subject:  Re: Good starting place on jets
I like the VZ15 in mine. Just personal preference again. I think I have way more bottom end than most, but the VZ series I supposed to wear faster than a "proper" FK with 1.4's. I like my setup A LOT.
Author:  perrib [ Sun Apr 19, 2009 12:08 am ]
Post subject:  Re: Good starting place on jets
Personally for the driving I do, I really like my Weber version of the VZ 25 for my 2180. I had the lifter bores sleeved at around 20,000 miles. They should of been done before that. The 2386 engine I want to try the VZ 15 in is for a rail with stock 12 volt gearing. I was hoping the less duration would still let it pull hard with the stock 3/4 gears. I never drove the 1835 or the 2180 with anything other than 1.58 and 1.26 3/4 gearing so I have nothing to go by. I have a DDS 11 1101 cam in my 2386 It was Dean Lowrys version of the FK 8 it had more duration and lift but not quite an FK 10. It is also a very torquey engine.
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