benlg924
|
| posted on 23/3/09 at 05:56 PM |
|
|
Home Brew Vacume Take Off
hi all
almost there with my bike carb conversion got everything now except the inline fuel filter but they are pence so will be on my next visit to ebay.
just wondered how people have taken their vacume for the dizzy from their home brew manifolds?
my vacume lines are about 4mm internal diameter and i need to run one from the 4th tube to the dizzy
how have you all sorted yours?
Cheers
Ben
|
PLEASE NOTE: This user is a trader who has not signed up for the LocostBuilders registration scheme. If this post is advertising a commercial product or service, please report it by clicking here.
|
|
|
jacko
|
| posted on 23/3/09 at 06:11 PM |
|
|
Some say you can run all 4 pipes into a small cylinder and one to the dizzy
bogg brothers just set the dizzy too 34-36 %
you really need a modifide dizzy or use megajolt
Jacko
|
|
|
benlg924
|
| posted on 23/3/09 at 08:33 PM |
|
|
just a thought
do you have to run the vacume from the manifold or can you run it from the air box?
|
PLEASE NOTE: This user is a trader who has not signed up for the LocostBuilders registration scheme. If this post is advertising a commercial product or service, please report it by clicking here.
|
jacko
|
| posted on 23/3/09 at 08:36 PM |
|
|
Manifold have a look in my photos under zx9r & manifold
|
|
|
jacko
|
| posted on 23/3/09 at 08:41 PM |
|
|
the nuts that have been brazed on are for vacuum pipes and balancing the carbs .
I dont use them now for vacuum pipes know i have a modifide dizzy
 
view of vac take off pipe nuts
|
|
|
benlg924
|
| posted on 23/3/09 at 08:44 PM |
|
|
cheers mate
what do you mean when you say
set the dizzy too 34-36 %
or how do you modify the dizzy? sorry for all the questions never done anything like this before.
also i was thinking i could drill and tap the manifold to acept a fuel union
|
PLEASE NOTE: This user is a trader who has not signed up for the LocostBuilders registration scheme. If this post is advertising a commercial product or service, please report it by clicking here.
|
benlg924
|
| posted on 24/3/09 at 09:33 AM |
|
|
would these be ok to use?
|
PLEASE NOTE: This user is a trader who has not signed up for the LocostBuilders registration scheme. If this post is advertising a commercial product or service, please report it by clicking here.
|
benlg924
|
| posted on 24/3/09 at 11:24 AM |
|
|
little re think on this I was thinking
first manifold tube:
second, third and fourth:
all connected with
what would I need to run them into before the dizzy?
also I am struggling to find a reducer for the dizzy from 6mm to 4mm any ideas of where to get them?
|
PLEASE NOTE: This user is a trader who has not signed up for the LocostBuilders registration scheme. If this post is advertising a commercial product or service, please report it by clicking here.
|
jacko
|
| posted on 24/3/09 at 04:38 PM |
|
|
Too set the timing to 34% use a timing gun strobe] rev the engine to 3000rpm and adjust the dizzy timing to 34/36%
the engine may be hard to start it will be a bit like a flat battery
This is only a temporary thing till you buy a modified dizzy or fit megajolt
|
|
|
benlg924
|
| posted on 24/3/09 at 05:18 PM |
|
|
think it will definatly be the way to run 4 vacuum outs
would it be best to run them in a continuos line from 1,2,3,4
or would it be best to run individual lines from each to a collector tube ect?
|
PLEASE NOTE: This user is a trader who has not signed up for the LocostBuilders registration scheme. If this post is advertising a commercial product or service, please report it by clicking here.
|
dave r
|
| posted on 24/3/09 at 05:41 PM |
|
|
i found that when i ran 4 vacs joined, it affected the lift on the carb slides... the tap offs wernt big to start off with , but i ended up soldering
them up and drilling 1mm or so holes thru the solder
|
|
|
benlg924
|
| posted on 24/3/09 at 10:19 PM |
|
|
so 4 8mm fuel unions may be too much?
also is it best to have them seperate or in a row all joined together?
|
PLEASE NOTE: This user is a trader who has not signed up for the LocostBuilders registration scheme. If this post is advertising a commercial product or service, please report it by clicking here.
|
cliftyhanger
|
| posted on 25/3/09 at 06:28 AM |
|
|
mig tips!available with 5 or 6mm threads. Cheap and nice small bore.
I would join ideally to a small chamber (bit of copper pipe with end caps, solder on some more mig tips?) or use joiners so joining 1+4, and 2+3 then
into 1.
That would be ideal for megajolt too.
But thinking about it, the old alfa engines just had a single take off no1 inlet with the dcoes/dellortos.
Hmm, that would be easier....
|
|
|
benlg924
|
| posted on 25/3/09 at 09:05 AM |
|
|
just been reading
http://www.turbosport.co.uk/showthread.php?t=141555
and they seam to think it is not that important to run the vacuum
i am getting confussed now what is the main benifits?
|
PLEASE NOTE: This user is a trader who has not signed up for the LocostBuilders registration scheme. If this post is advertising a commercial product or service, please report it by clicking here.
|
FASTdan
|
| posted on 25/3/09 at 10:41 AM |
|
|
quote:
Originally posted by cliftyhanger
mig tips!available with 5 or 6mm threads. Cheap and nice small bore.
I would join ideally to a small chamber (bit of copper pipe with end caps, solder on some more mig tips?) or use joiners so joining 1+4, and 2+3 then
into 1.
That would be ideal for megajolt too.
But thinking about it, the old alfa engines just had a single take off no1 inlet with the dcoes/dellortos.
Hmm, that would be easier....
when running off only one barrel (on twin 40's) we found the dizzy started ticking due to the pulsing of the vacuum (as the inlet valve opens +
closes) so gave up on vacuum advance. I assumed that joining all four barrels would cause havoc with the balance of the carbs?
Whats the function of this little chamber thing people keep mentioning?
|
NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
|
cliftyhanger
|
| posted on 25/3/09 at 03:53 PM |
|
|
Vacuum will allow extra advance on light throttle openings, allowing a better burn and more economy. Thats the main thing it does.
The cannister is to smooth the pulses from the 4 take-offs and give an "average" vacuum. This is more important with a megajolt with MAP
sensor which will respond faster than the vac advance on a dizzy.
Oh, and I doubt joining the intakes will affect balance at all. Just that when you do balance the carbs probably best to blank them all off to be on
the safe side.
[Edited on 25/3/09 by cliftyhanger]
|
|
|
benlg924
|
| posted on 25/3/09 at 08:20 PM |
|
|
Little update:
happy as a pig in the brown stuff my manifold came back today so got the silicone out and it looks good. just waiting on the jubilee clips to arrive
and a 10mm union to tap in for the brake servo and then a 6mm union to tap in for the vacuum
Cheers
Ben
|
PLEASE NOTE: This user is a trader who has not signed up for the LocostBuilders registration scheme. If this post is advertising a commercial product or service, please report it by clicking here.
|
benlg924
|
| posted on 26/3/09 at 07:00 PM |
|
|
the worlds smallest update:
took the manifold to work today so i could get a couple of blobs of weld on the runners to help keep the jubilee clips in place and also a little spot
where there was a tiny hole on the weld holding the tube to the base..
fingers crossed the jubilies arrive tomorrow.
also ordered the transaxle plugs from audi to fill the injector holes so they can be collected saturday, i really can t wait now almost there.
Cheers
Ben
|
PLEASE NOTE: This user is a trader who has not signed up for the LocostBuilders registration scheme. If this post is advertising a commercial product or service, please report it by clicking here.
|
jacko
|
| posted on 26/3/09 at 08:35 PM |
|
|
What car is this going on ?the size of that manifold it cant be a 7 type can it 
A brake servo too
|
|
|
benlg924
|
| posted on 27/3/09 at 04:23 PM |
|
|
on my porsche 924 2ltr
it is 300mm from back plate to tip of trumpet which should be ideal from what i can gather for the engine ect
|
PLEASE NOTE: This user is a trader who has not signed up for the LocostBuilders registration scheme. If this post is advertising a commercial product or service, please report it by clicking here.
|
benlg924
|
| posted on 30/3/09 at 07:39 PM |
|
|
another little update:
painted the manifold in matt black bar b q paint so at least it wont go rusty.
also just got the unions for the vacume take offs a 6mm for the dizzy and a 10mm for the brake servo.
think i need to weld a nut to the manifold tubes and then drill through the middle before screwing in the unions.
Any other options for mountin these unions?
also got my silcone friendly jubilee clips
and then the transaxle plugs arrived to block the injector holes.
trying to get it booked in for rolling road on the 16th aprill so fingers crossed it will all be sorted soon.
Any ideas on the vacume take off would be great.
Cheers
Ben
|
PLEASE NOTE: This user is a trader who has not signed up for the LocostBuilders registration scheme. If this post is advertising a commercial product or service, please report it by clicking here.
|
