Yet another single carb thread :) Dan's 1" runners from plenum to custom head flanges

[dan filipi]

My intention with this thread has been to see what 1" intake tubes will do only.
My method used to fit them will not stay. This is only a test.

The pics that follow are as it sits now.
It runs MUCH better.

Idle is smooth.
Acceleration is good even with a fast twist into the secondary opening and settles right down to 900-1000 rpm idle.
I can tell by the way it sounds it's firing much better.

With the old tubes I had I had to set the idle mixture screw out 5 turns more than it is now even though there were only very tiny vacuum leaks.

So far running in the garage I'd say 1" runners are a success but the ride report will tell more.
I won't be able to get a test ride in until tomorrow afternoon :crying:

Epoxy in the tube you knead in your hands is what you see.
It cures hard in about an hour.

I have one tiny vacuum leak at the number 4 head which I added a bit more which should seal it.

 

[Steve83]

Excellent! Lookin' forward to your report...

 

[joedrum]

hes been talking to me ...a little dab will do ya :hihihi: :mrgreen:

 

[westgl]

Dan,

Is that JB weld?

I like how #4 has a smilily face, that was a bad cyl. for me too.

The worst ones #1 & #4, look good now.

 

[westgl]

Dan

Any way you can do a durability test, on the manifold the way you have it.

If it works, and it lasts, why do anything?

One thing about JB weld is you must have a very clean surface, even rough it up a ltlle so that it has a rough surface to grab onto.

And you must let it Completely Cure before you use it

 

[Ansimp]

I just want to know what is holding the windows in your house after you have used all the putty on your manifold? :smilie_happy:

 

[slabghost]

I haven't seen a window installed with putty in 20 years. Gotta find other uses for the stuff.

 

[joedrum]

looks great ...to me...cant wait for test ride report .....it will be great if the 1" pipe proves big enough to do high rpm work as the size pipe is rather easy to get ...if it proves small it seems 1 !/8 pipe would be next step to try ....so im pulling hard for this ....its already proved to idle and run better in the garage over previous trys on this bike ....

 

[dan filipi]

A short ride report...

It's bogging on takeoff like it's not getting enough gas.
Wide open throttle once moving it jumps up and goes telling me 1" runners are big enough.

Back in the garage....

Checking closely I've got a few vacuum leaks to deal with.
Plan b approach.

 

[westgl]

Dan,

You had off idle bogging before.

With the Larger hose.

I wonder if you are overly rich in that off idle circuit?

Or lean, because of the vacuum leaks?

 

[dan filipi]

Ok, a very successful update!

1. Idle is smooth, it's comparable to stock carbs.
2. Bog is gone.
3. My clothes don't stink after running in the garage with door cracked open like before.
4. Rideabilty is smooth all the way up to 7-8000 rpm.
5. There is a definite increase in lower end takeoff torque compared to stock.
6. After riding hard then coming to a stop, idle drops to below set rpm then comes back up after a few seconds.
Sort of "loading up" not sure. Stock carbs never did that. So far not an issue.

I'm going to install the radiator air deflectors then do a longer run, hopefully some freeway.

 

[slabghost]

Sounds like a super success. Congratulations!

 

[82a]

westgl » Fri Oct 04, 2013 10:21 pm[/url]":33onkhow]
Dan,

Is that JB weld?

I like how #4 has a smilily face, that was a bad cyl. for me too.

The worst ones #1 & #4, look good now.

Epoxy in the tube you knead in your hands is what you see.
It cures hard in about an hour.

arty: k: :rocks: :yahoo: :yes: :clapping: :music: :Egyptian: opcorn:

 

[Dusterdude]

What kind of intake did you use?thanks

 

[dan filipi]

Dusterdude » Sun Oct 06, 2013 2:44 pm[/url]":1wlckvcf]
What kind of intake did you use?thanks

It's a vw type 4 plenum with my made up 1" runners for a direct shot into the intake without a 90 degree turn.
Have a look at the picture in post #1.
That shows left side of the plenum and the first runner as a template on the #4 cylinder.

 

[westgl]

Dan,

What did you do to fix the problems you were having?

That info may be very helpful to someone.

 

[slabghost]

He sealed off the vacuum leaks and reset the air fuel mix.

 

[westgl]

What was the correct air fuel mixture setting?

I understand it could be different, but a starting point is always good

 

[Dusterdude]

Groovy,thanks dan

 

[joedrum]

yep this is nice set up dan trying out