Single Carb Conversion 2 Barrel Progressive Holley,Weber 740 carb

[82a]

Dusterdude » Sun Oct 27, 2013 5:57 pm[/url]":151apyxn]
I probably missed it but,does anyone know the oe application for the 32/34 dft carb?thanks

viewtopic.php?f=107&t=6892&p=105852#p105852

viewtopic.php?p=99188#p99188

 

[joedrum]

well maybe you did and didn't ....I have tried the 32-34 ... its not a DFT carb ....its a DMTR I think the letter thing is killing me ... it is the carb that I think will hooches final carb set up ...the last site someone put up had some great info https://www.piercemanifolds.com/category_s/234.htm here a carb pic of it ..seems to have a vacuumed type accelerator pump ... not sure about that...mines linkaged control ... but it dose lack power valve as mine dose too ...the only difference in primary is the fixed choke is 24 instead of the 22 of the 32DFT ...and maybe a idle jet passage small difference ... when this carb was on hooch it seemed to be real nice and strong in primary ... at the time I had very little figure out ....but im going back to this carb I think ... it provides better air flow slightly in primary and in the secondary it provides much move air flow ... as throttle plate opening is 34 as oppose to 32DFT 32 opening ... and the fixed air choke is 25 instead of 22 of the 32DFT...im thinking now I can get the secondary to work now that ive got a grasp on the jetting and dialing in

its very possible that this might be ultimate set up as carb goes ...im almost positive it will be for me but hooch is quite different from the 1100s and 1000s as in comparison so I just cant say or push that this carb or 740 32-34 is good choice for stock ... but im sure im going to get the most out of hooch with this carb .... this is a racing carb set up for Europe small car oval track racing says were are messing with fine carbs here for our oldwings

 

[joedrum]

I knew the letter thing was getting to me ....im thinking this is probably the ultimate carb for high end moded motors like I have with hooch and it may be fine for stock too just way to early to say ..I just seen this carb yesterday for first in this link ... but it pretty much like the on I got and have had on hooch ...32-34 DMTL weber
https://www.fastroadcars.co.uk/shop/inde ... ductId=197

 

[82a]

looks like the info below is incorrect (links go to 81 1.6l escort/lynx engines)

(scroll up on this next page)
viewtopic.php?p=105953#p105953

only other answer i've seen 1.9l escort

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viewtopic.php?p=105895#p105895

82a » Mon Dec 23, 2013 12:51 am[/url]":11lgfqch]

Dusterdude » Sun Oct 27, 2013 5:57 pm[/url]":11lgfqch]
I probably missed it but,does anyone know the oe application for the 32/34 dft carb?thanks

viewtopic.php?f=107&t=6892&p=105852#p105852

viewtopic.php?p=99188#p99188

 

[tom foreman]

I,m running a pic 34.on this 1100..instant power to 8 grand..throttle is instant..thanks joe,jerry.for the help.dailed in carb ,waiting for next tank.fuel reports. :music:

 

[dan filipi]

tom foreman » Wed Sep 10, 2014 10:41 am[/url]":1og9hzvk]
I,m running a pic 34.on this 1100..instant power to 8 grand..throttle is instant..thanks joe,jerry.for the help.dailed in carb ,waiting for next tank.fuel reports. :music:

Best way to burn gas.....on 2 wheels!

 

[Denver]

Looks great, clean, & stock looking, very nice. Where's passenger grab handle?

 

[joedrum]

toms chromed intske manifold is the best looking set up i have seen ... really nice job he had done to it

 

[IBAJIM]

Wow !! Been reading the posts on this thread and I'm convinced that my GL1100I needs a single carb mod. Just ordered a re-man Motorcraft 5740 (740 ) progressive two-barrel that I will eventually install, along with a sheet steel home brew manifold that I have designed.

Now for my blurb : I'm new here and also have a ST1100 w/ CV carbs. I believe MODERN CV carbs can't be beat. I double a single carb would work any better on my ST1100 than the stock CV carbs. Certainly worse. Why ? Because it's impossible to give a bike w/CV carbs too much throttle. CV stands for "constant velocity". It's basically a variable venturi carb. Small at low RPM's and bigger at higher RPM's. The venturi size is variable - it depends on the position of the slide. Perfect set-up for the optimum throttle response. So what is the problem with the CV carb set-up on the old Wings ? Those CV carbs are a poor design because they don't use the rubber diaphragms above the slides like the modern CV carbs use. I believe that's the reason why the single carb set-up is a big improvement on the old Wings.

After doing a calculation for what size CFM carb the 1,100 c.c. motor would need at 7,800 RPM and assuming 100% volumetric efficiency, I came up with 152 CFM. That's just about the CFM a 1,600 c.c. engine @ 6,000 RPM would need. So that's why the 740 carb that was used on the 1.6 L Escort & Lynx should work just fine. I was first thinking of using a 30 PICT-1 single barrel, but decided on the 740 because the primary bore is even smaller than 30 mm. That should result in better low speed response and maybe better gas mileage. And it will have more than enough flow using both barrels - about 185 CFM.

For the manifold, the runners will be 1.25" , about 80% of the intake valve diameter. And the plenum box will be 5.5" x 4" x 3.25" ( high). That will give me a volume of 71.5 C.I.( 1,164 c.c. ) , a little more than 1,100 c.c. And the runners won't be flush with the inside of the plenum wall. They will protrude about a half inch inside the plenum and I'll weld some rings to the end of the runners inside the plenum to help airflow. And the runners won't be up close to the sides of the plenum walls, either. I'll try to keep the bottom of the plenum as close to the engine as possible, to keep it warm.

Now, to find time to do the job, after I install new timing belts & idler pulleys and install a set of RaceTech emulators and a set of Sonic springs in the front forks that I have on hand, after :blush: I remodel the kitchen for the Boss.

BTW, before I do the single carb mod, I think I will do some testing with the stock set-up by timing a half dozen 40 mph to 80 mph pulls, in 4th & 5th gears. Then I can compare the performance difference with the single carb.

 

[Dusterdude]

Groovy

 

[sgq700]

i'm just getting started on my intake for a st1100 that i just picked up missing the carb rack and fuel pump!! I'm going to use a carter/weber just like the one on my oldwing! also removing all the plastic from the st and using old wing bags,fenders,false tank and more than likely a old vetter nose faring. should be ugly and fun with 100 horsepower... Enjoy!!

 

[slabghost]

sgq700 » Mon Jan 12, 2015 7:51 pm[/url]":1yig2x00]
i'm just getting started on my intake for a st1100 that i just picked up missing the carb rack and fuel pump!! I'm going to use a carter/weber just like the one on my oldwing! also removing all the plastic from the st and using old wing bags,fenders,false tank and more than likely a old vetter nose faring. should be ugly and fun with 100 horsepower... Enjoy!!

Start a thread on that build I want to follow that! :thanks:

 

[IBAJIM]

sgq700 » Mon Jan 12, 2015 8:51 pm[/url]":2jjmefyw]
i'm just getting started on my intake for a st1100 that i just picked up missing the carb rack and fuel pump!! I'm going to use a carter/weber just like the one on my oldwing! also removing all the plastic from the st and using old wing bags,fenders,false tank and more than likely a old vetter nose faring. should be ugly and fun with 100 horsepower... Enjoy!!

Cool !! I wish I was closer to you. I would like to compare my ST1100 to yours after you have it back running with a single carb.

BTW, you can get a low pressure auto fuel pump that you can fit in the tank like the original. I got one recently from Rockauto.com ( cheap). Look for one that fits an old Honda auto with a carb. It would be possible to install one on an old Wing, too. I may do that to my GL1100, eventually.

 

[sgq700]

will do!!

 

[Txtriathlete]

I know this topic is a little stale, but wanted to ask the group at large (westgl, dan, joedrum, etc.) if we ever settled on an acceptable material/off the shelf item to use for runners. I have the carb and vw manifold but seem to be stuck on what to use to link it over to the intake manifolds. I'm using this on a 78 GL1000.

I built the PVC Pict 32 manifold setup discussed on this site and others for my other 78 wing and it seems to be working well. I found the 32/32 and VW manifold the other day and thought I might try the flex PVC for runners with that set up unless someone has hit upon a better solution.

Thanks to all who contributed to this thread (52 pages!!) - I started reading this a couple of years ago looking for a way around the 4 banger carb setup and and this thread inspired me to give it a try.

 

[slabghost]

Several have used grab rails for handicapped as runners successfully. Eliminating the stock intake horns.

 

[Omega Man]

I always liked Joe's rubber tubing and grab rail solution.

~O~

 

[ianstaley]

Why not have some SS/Ally bent on a mandril to size and shape. 4 Small bends and slightly bent in an angle should be OK. and should cost too much.

 

[joedrum]

Well now ..I’ve reading this old thread quite a bit ...and it’s pretty clear ..that the grab bar rail manifold hooch has ...was done in 2013 ...to be honest I’ve never changed it one time since ...so this has been done for 7 yrs and the hooch is most likely 8-9 yrs old now ...WOW time flies ....I well have to say I think the grab bar manifold is the best ever ....it’s ability to flex and move with motor movement maintains great seal ...I’ve never made new gaskets for runners or carb ...carb gasket is of very thick make up up too ...I’d say this carb been on and off 30 times maybe over the years ....never ever a problem with this set up ...I call it the shovelking induction system after the man who came up this this design so many yrs ago ...sure has been a flawless system for me ...

 

[Dirt Road Cowboy]

That's great Joe.

I've put my single carb work on hold for a while, and had Pistol Pete's son, Mark, rebuild my stock rack because my daughter really wanted to ride with me. She got her license earlier this year, and bought a used Yamaha R6.
She said that her friends are no fun to ride with most of the time, and it's great to spend some bonding time with her.

I'll get back into playing with the single carb again, but having a good running bike is a top priority right now.