Login    Forum    Search    FAQ

Board index » Racing Forum » Fuel Systems




Post new topic Reply to topic  [ 73 posts ]  Go to page Previous  1, 2, 3, 4, 5  Next
Author Message
 Post subject:
 Post Posted: Mon Feb 04, 2008 10:57 am 
Offline

Joined: Thu Jul 19, 2007 11:08 am
Posts: 400
yeah it's odd Ken, after studying it, I figured the groove in the linkage would need to be longer as the length of the slot effectivly governs the stop / closed position of the secondaries. I may get it milled (or precision filed !) slightly longer to get them closed as it shouldn't affect the rate they open as this is governed by the profile and the other end of the slot.

_________________
Image


Top 
 Profile  
 
 Post subject:
 Post Posted: Mon Feb 04, 2008 11:06 am 
Offline
Site Admin
User avatar

Joined: Tue Apr 18, 2006 6:38 am
Posts: 11804
Location: Coming At Ya!
PSweeney wrote:
yeah it's odd Ken, after studying it, I figured the groove in the linkage would need to be longer as the length of the slot effectivly governs the stop / closed position of the secondaries. I may get it milled (or precision filed !) slightly longer to get them closed as it shouldn't affect the rate they open as this is governed by the profile and the other end of the slot.


Yeah Phil, I was thinking that too.  It's good to see you have enough mechanical savvy to figure out how to fix it.  That just makes me more confident that you'll get the rest of it done OK.  Just remember to use the locktite when you put the screw back in it!  ;-) I found mine loose last summer AFTER I pulled it off of a friends engine.  Wouldn't have been long and it would have done some damage to his stuff.  Got lucky for a change I guess. =; A blind squirrel will pick up an acorn occasionally.  It was my turn that day.

_________________
Big Boyz Toyz!

Image

Necessity is the plea for every infringement of human freedom. It is the argument of tyrants; it is the creed of slaves.

William Pitt, British Prime-Minister (1759-1806)


Top 
 Profile  
 
 Post subject:
 Post Posted: Mon Feb 04, 2008 11:39 am 
Offline

Joined: Thu Jul 19, 2007 11:08 am
Posts: 400
split washer, loctite and split pin, I got too much £££'s in there to let a nut go through it all !

mechical savvy , I have my momments (not often though !).  Getting more of a gist the more I read on the 2 circuit conversion but I'm still unclear where and what to do.

_________________
Image


Top 
 Profile  
 
 Post subject:
 Post Posted: Mon Feb 04, 2008 12:31 pm 
Offline

Joined: Sun Nov 11, 2007 10:33 am
Posts: 1293
Location: Montgomery, Alabama
Yea the pin gauges come in handy for several reasons.

Verify jet sizes in case someone drilled one.

Verify air bleeds for same reason.

And gauge all of your existing holes.

Brass set screws
http://www.mcmaster.com

You need one box of each.

10-32 x 1/4 Part Number:  92991A825

8-32 x 1/4 Part Number:  92991A190

6-32 x 1/4 Part Number:  92991A144

Drill bits
61-80 Part Number:  31055A64

1-60 Part Number:  31055A62

Pin vise  Part Number: 8455A16


Top 
 Profile  
 
 Post subject:
 Post Posted: Mon Feb 04, 2008 12:39 pm 
Offline

Joined: Sun Nov 11, 2007 10:33 am
Posts: 1293
Location: Montgomery, Alabama
BTW I got my drill bits locally

Got the 1-60 at Grainger
And the 61-80 at Alabama Machinery

There is a trick to drilling the small holes. Tuner forgot to tell me until I had already broken a bit.  [-(

For example a .026 hole.

Put the set screw in your cordless drill and the .026 drill in your pin vise. Turn the drill very slowly about 25 RPM and gently feed the drill bit being very careful when it breaks through. I had a second cordless drill with a #60 drill in it to start the hole and make sure it was on center. Then finished it up with the .026

The finished product will look something like this.

Image

Doh I almost forgot

You need taps too. Bottoming taps seem to work better on the idle jet.


Top 
 Profile  
 
 Post subject:
 Post Posted: Mon Feb 04, 2008 12:44 pm 
Offline

Joined: Sun Nov 11, 2007 10:33 am
Posts: 1293
Location: Montgomery, Alabama
This is where the T Slot jet goes.

Once you start a drill in there for the 10-32 that brass insert will come out.

Image


Top 
 Profile  
 
 Post subject:
 Post Posted: Mon Feb 04, 2008 1:37 pm 
 
It’s a PITA but the adjustment for the secondary linkage is done by bending the link that connects the lever on the throttle shaft to the bell-crank (in the bottom of the carb).  You should use a 4-hole spacer or 4-hole plate to block off the bottom of the carb from the manifold.


Top 
  
 
 Post subject:
 Post Posted: Mon Feb 04, 2008 2:10 pm 
Offline
Site Admin
User avatar

Joined: Tue Apr 18, 2006 6:38 am
Posts: 11804
Location: Coming At Ya!
Scott, what's all them damn air bleed holes open for? Image Didn't we teach you better than that? ;-)

_________________
Big Boyz Toyz!

Image

Necessity is the plea for every infringement of human freedom. It is the argument of tyrants; it is the creed of slaves.

William Pitt, British Prime-Minister (1759-1806)


Top 
 Profile  
 
 Post subject:
 Post Posted: Mon Feb 04, 2008 2:58 pm 
Offline

Joined: Sun Nov 11, 2007 10:33 am
Posts: 1293
Location: Montgomery, Alabama
LOL! That was my old 3 circuit block I removed. The pics are just for illustration purposes.  =;


Top 
 Profile  
 
 Post subject:
 Post Posted: Mon Feb 04, 2008 7:30 pm 
Offline
User avatar

Joined: Wed Apr 19, 2006 8:20 pm
Posts: 5852
Location: N.J.
Thanks for those pic's Scott!!!  It makes thinks a bit clearer now =;

Did Tuner give you some kind of "what to drill and what size to start" with
and then go from there??????

_________________
Image
running E85
Best ET 8.07
Best MPH 170.71
Barry


Top 
 Profile  
 
 Post subject:
 Post Posted: Mon Feb 04, 2008 9:18 pm 
Offline

Joined: Sun Nov 11, 2007 10:33 am
Posts: 1293
Location: Montgomery, Alabama
Yes he did. But it is different for different apps.

I'll have to dig my notes out.


Top 
 Profile  
 
 Post subject:
 Post Posted: Tue Feb 05, 2008 6:49 am 
Offline
User avatar

Joined: Wed Apr 19, 2006 8:20 pm
Posts: 5852
Location: N.J.
Is it possible to do the mod to a 3 circut and lean out the idle??

_________________
Image
running E85
Best ET 8.07
Best MPH 170.71
Barry


Top 
 Profile  
 
 Post subject:
 Post Posted: Tue Feb 05, 2008 8:22 am 
Offline

Joined: Thu Jul 19, 2007 11:08 am
Posts: 400
can you not lean it with the idle screws currently Barry ?

I had a fat idle because it was basically running on the T Slots, I'm hoping to close the throttles (as my secondaies were being held open by the primary linkage) and go back to tuning the idle with the idle screws/ bleeds and installing additional bleeds to create the controlled vacuum leak (instead of drilled throttle blades)

Hopefully with the TSJ's and the 2 circuit conversion I should get a handle on it and get it running clean and performing well in a safe rich zone.

Ken/ Tuner / Scott, you have an audience of 2 ! I think Barry and I get the concept but like Barry said, a guide as to what to measure, what to drill, what to tap and which points will need to be tailored or tested dependant on application would really help. I'd be happy to document and photograph the process for others ?

_________________
Image


Top 
 Profile  
 
 Post subject:
 Post Posted: Tue Feb 05, 2008 9:21 am 
Offline
Site Admin
User avatar

Joined: Tue Apr 18, 2006 6:38 am
Posts: 11804
Location: Coming At Ya!
I don't know about you guys, but this thread has gotten a bit large and would be confusing to someone new interested in doing this.  So, I'm going to start another thread for a two circuit mod and lock this one if no one has any objections.

_________________
Big Boyz Toyz!

Image

Necessity is the plea for every infringement of human freedom. It is the argument of tyrants; it is the creed of slaves.

William Pitt, British Prime-Minister (1759-1806)


Top 
 Profile  
 
 Post subject:
 Post Posted: Tue Feb 05, 2008 10:15 am 
Offline
User avatar

Joined: Wed Apr 19, 2006 8:20 pm
Posts: 5852
Location: N.J.
Ken , go ahead and lock it....If you want =; ...Will post on  new subject =;

_________________
Image
running E85
Best ET 8.07
Best MPH 170.71
Barry


Top 
 Profile  
 
Display posts from previous:  Sort by  
 
Post new topic Reply to topic  [ 73 posts ]  Go to page Previous  1, 2, 3, 4, 5  Next

Board index » Racing Forum » Fuel Systems


Who is online

Users browsing this forum: Yahoo [Bot] and 4 guests

 
 

 
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to: