Skip to main content

Closed4 replies

New dual 34-Solex's

C Catmandu
I just received my new dual Brosol/Solex 34mm kit, and noticed a nasty casting flash inside both venturi's. They are pretty ragged, and sharp enough that you could almost cut yourself on them. That can't be good for airflow,, as venturi's should have smooth transitions, I would think. Has anyone else seen this ?? I certainly don't want to take these new carb's apart. I suppose it would be possible to improve the flash by polishing it in place,, with a vacuum placed below, to draw out any filings and grit particles. It is a shame to have to do work like this on new product. It is not really CPI's or CB-performances fault, as it obviously came to them from Brosol like this, and the carb boxes were sealed. Other than that,, the quality of the kit looks great. The only other thing I could ask them for, is some installation documents. But I am looking for good articles online,, like this one. Alan

http://www.ratwell.com/technical/DualCarbs.html
Original Post

Replies sorted oldest to newest

C Catmandu
I just received my new dual Brosol/Solex 34mm kit, and noticed a nasty casting flash inside both venturi's. They are pretty ragged, and sharp enough that you could almost cut yourself on them. That can't be good for airflow,, as venturi's should have smooth transitions, I would think. Has anyone else seen this ?? I certainly don't want to take these new carb's apart. I suppose it would be possible to improve the flash by polishing it in place,, with a vacuum placed below, to draw out any filings and grit particles. It is a shame to have to do work like this on new product. It is not really CPI's or CB-performances fault, as it obviously came to them from Brosol like this, and the carb boxes were sealed. Other than that,, the quality of the kit looks great. The only other thing I could ask them for, is some installation documents. But I am looking for good articles online,, like this one. Alan

http://www.ratwell.com/technical/DualCarbs.html
Gordon NicholsGordon NicholsMassachusetts 1993 CMC Supporting Member
Al:

I suppose it depends on exactly how much flashing is in there...

1/8" high? 3/16"? 1/4"? More? What about how wide?

If it were me (bearing in mind that I'm chronically lazy) and it was a vertical line of flashing that was less than 3/16" high from the bore and less than 1/8" wide, I would just leave it. The impediment to the air flow would be almost un-measurable.

If it's more than that, I would gently grind it out with a Dremel and a fine stone while blowing air through from the opposite side (using the output from a vacuum cleaner). In fact, taping the blower hose to the carb might be a good idea, as well as using a flexible shaft on the Dremel, just to make the job easier.

gn
C Catmandu
Thanks for the reply, Gord,,
Actually, the flash is horizontal, variable is size, and up to a max of 1/16. It projects from the smallest diameter (26mm, I think) of the venturi, into the airstream. Working past the chokes will be difficult. I even have wondered about buying the new larger Hi-flow venturi's, available from CB ($7each). But that would likely mean some rejetting too.

I think I am going to create a flowbench, by taping my vacuum to the bottom, or maybe even using the kit's manifolds. Then smooth the flash from above with an appropriate small file. I am not in any rush with this,, so I can patiently plan this out. It just doesn't seem right to leave it as is. And obviously now is the time to correct it, prior to install.
Alan
Gordon NicholsGordon NicholsMassachusetts 1993 CMC Supporting Member
"REAL Carbs don't have chokes..."

;>)

Sounds like you know what you're doing - have fun!

You know, I was going to mention a Laminar Flow Bench as an example of how to keep them contaminate-free whilst grinding, but thought it would take too many key-strokes to explain the damn thing. Haven't used one of those since I designed inertial guidance systems, back in the 70's!

Now mechanical gyro's are passe in favor of solid-state LASER gyro's- now THOSE are cool!

gn
"Over the hill, but not under the influence"
Post Content
Remove This Ad

Membership Required

We're sorry. You must be signed in to continue. Sign In or Register
×
Are you sure you want to remove from your Block List?
×
Loading...
×
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .
×
Link copied to your clipboard.
×

Access to this requires a premium membership.

Supporting Member

Please help keep us running!

Supporting members have donated about $4.00 a month ($49.00 US per year) paid annually.

  • Priority support
  • Removal of inter-page (between thread) advertisements.
  • Access to Build Manuals
  • Access to Knowledge Base
  • Access to Supporting Members events.
  • Access to Leveraged Group Buying from site Merchants.

AUTO RENEW: You membership will auto-renew after 12 months. If you prefer not to auto-renew, you can cancel your premium membership at any time and it will remain in effect until the end of the 12 months. To cancel, sign in at SpeedsterOwners.com and navigate to: (Your User Name)  > Premium Membership.

PLEASE NOTE: Your credit card will receive a charge from CROWDSTACK PAY, the payment processor, not SpeedsterOwners.com.

$49.00 per 12 Months (plus tax if applicable)
×