RobBrown
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 posted on 12/8/12 at 12:40 PM |
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Where to start first with Carbs
Hi All
It's been a while (too long) but I was motivated yesterday to dust off the car and make sure everything still worked, and swap my dellortos over
to the Bike carbs that I've been meaning to fit.
So now I'm after some practical advice.
I made sure the engine started and ran (on the dellortos) before doing anything, so whipped them off and mounted the R1 carbs (from fleabay), onto the
car.
I connected the fuel directly from my mechanical pinto pump, directly to the pipe on the underside of the carbs.
But no joy in starting. A little bit of fuel was coming out of the black pipe on top (between 3 and 4)
What do I address first (bearing in mind I know nothing about these carbs)?
Should I be drilling out the main jet to 1.6mm first, or is there something more fundamental first?
Should I expect these to start, if they came off a running engine?
Once I know things are running, if not a bit lumpy I'll get them to a RR.
Thanks
Rob
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maccmike
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| posted on 12/8/12 at 01:46 PM |
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Id have the bike pump fitted for one.
I assume the carbs have been sat for a bit?
Take carbs off
Split them into 4
Remove and clean with brake cleaner/petrol and an airline;
float bowls
floats (no cracks or leaks)
all the jets
carb tops
diagrams for splits
check the orings on the joining pipes for splits/damage.
clean or renew inline fuel filter.
Probably put fresh fuel in too if its been sat.
Check and re set floats if required.
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RobBrown
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| posted on 12/8/12 at 02:15 PM |
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After a bit of googling, went out and changed the needle ride height.
Moved the circlip from the top to the bottom.
Started first time 
maccmike - thanks for the response. These came pretty clean, and although have been sat around, had been in bubble wrap etc, so confident that they
would be clean enough to run. I'd also read (although you can get Google to prove anything), that if the Pinto was a Carb origianllly then the
mechanical pump should be OK, just with a regulator in. I don't know - I'll see how this goes for now - those bike pumps are expensive!
I checked the diaphams when changing the needle height
It runs OK - spits when I increase the RPM - I will move the circlip back up gradually - Any ideas what the normal setting is?
Any know what the spit at higher revs is due to?
Big smile - now motivated to complete this and get it running.
I'll take a video shortly
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JeffHs
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| posted on 12/8/12 at 02:25 PM |
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I'm very interested in your progress. I've just about given up trying to get mine to run sweetly on DCOE 40s (they're old and have
been hacked about in the past). So decided I needed to switch to bike carbs. Keep us posted.
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scoop
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| posted on 12/8/12 at 03:01 PM |
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I'm pretty sure will need a bike pump. Save loads of hassle in the long run as they run quite a low pressure and are usually the interrupter
type so won't flood the carbs. I would drill the main jet to 1.6mm. How many rings have you got on the needles? Have you blocked the air intake
holes up? There are loads of threads on here about this.
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scoop
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| posted on 12/8/12 at 03:08 PM |
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It's all flooding back to me now.
Are there idle control screws on R1's? If so screw them in until they are gently pinched up and mark the screw and the carb body and then turn
them out two full turns. Usually on bike carbs one is set on the air flow and you will need to balance the others to it.
[Edited on 12/8/12 by scoop]
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RobBrown
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| posted on 12/8/12 at 04:02 PM |
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5 ring settings
Was originally set on top setting - Too lean I suspect, so I moved to bottom - started straight away. Moved to middle spat heavily
now on 2nd ring from bottom (still spits)
youtubelink
I still think this is too lean. Would adjusting the idle control screw fix this?
The idle control screw is a bugger to get to when fitted to the car! I'm conscious of them getting out of sync.
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scoop
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| posted on 12/8/12 at 04:10 PM |
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Well, I would say you need to start with the idle and flow.
I was going to suggest one up from the bottom on the needle.
The easiest way to get to the idle screws is either from underneath with a log screwdriver or just release the four clps that hold them to the
manifold and flip them over. Should be one for each carb?
[Edited on 12/8/12 by scoop]
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scoop
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| posted on 12/8/12 at 04:12 PM |
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Long screwdriver! Bloody iPads!
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RobBrown
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| posted on 12/8/12 at 05:52 PM |
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Just discovered cracked engine block, leaking water . Will have to sort out carbs later
More cost, more delay.
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scoop
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| posted on 12/8/12 at 06:50 PM |
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Oh Christ. What a 205 block? I thought they were bomb proof?
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RobBrown
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| posted on 12/8/12 at 08:02 PM |
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quote:
Originally posted by scoop
Oh Christ. What a 205 block? I thought they were bomb proof?
Yep. just to the right of where the 205 is stamped as well, just to rub it in.
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rusty nuts
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| posted on 12/8/12 at 08:32 PM |
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Lack of antifreeze?
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RobBrown
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| posted on 12/8/12 at 08:44 PM |
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The mix would have been very week as I replaced a Core plug earlier in the week and just topped up with fresh water.
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RobBrown
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| posted on 26/8/12 at 05:26 PM |
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Hi guys
Now that I have sorted the crack, I'm still struggling.
I found that I can get the engine to run and idle OK, but when I take it for a spin there is no power.
I also found that turning the idle mixture screws did nothing (that I hear) to the engine RPM, other than affect whether I could restart or not.
Needle position 1 up from bottom seems to be better on the power. The bottom was too rich? black smoke etc. I get a lot of spit back on needle 2 up
from bottom. 1 up from bottom still spits a little.
The main jet now drilled to 1.6mm (was originally 1.4mm) - not that this is kicking in just yet!
Any advice on what to try next?
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scoop
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| posted on 26/8/12 at 05:39 PM |
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Put up some pics. Have you blocked the air jet yet?
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RobBrown
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| posted on 26/8/12 at 06:09 PM |
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Which one is that. I assumed that it was A as it was already blocked?
 
Carb
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scoop
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| posted on 26/8/12 at 07:10 PM |
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Ha ha. You've got me now. I would have said b. There are lots of threads on here about this or you can can always ring Bogg Brothers or
I'm sure I've found articles with a google search.
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scoop
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| posted on 26/8/12 at 07:12 PM |
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The idle screw adjusts the mix at idle and up to about half throttle. It won't adjust the idle speed. The dizzy setting does that.
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RobBrown
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| posted on 26/8/12 at 09:52 PM |
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Looks like the correct one is already blocked according to another thread.
Previous Thread
Will try and ascertain where it is bogging down tomorrow, to try and figure out whether it is the idle settings or the main jet needle.
I've also read in other threads that some have gone to 1.8mm main jet. I'm wondering whether this is needed on my 2l with high lift
cam?
Also as I have drilled out the jet whether the needle needs to sit lower - move circlip back to pos 3 on the needle?
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scoop
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| posted on 27/8/12 at 05:24 AM |
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Have you removed any of the plugs and looked at the colour of them for a rough indication of how it's running? 1.6mm should be enough initially.
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scoop
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| posted on 27/8/12 at 05:28 AM |
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It is timed up properly?
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FASTdan
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| posted on 27/8/12 at 07:52 AM |
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I've only skimmed the thread but if you are still running the mechanical pinto pump you need to swap to a bike pump or similar. The pinto pump
wont flow the fuel to run the bike carbs.
Genuinely not trying to flog you a pump (I have a stock of used bike pumps), but you may well end up changing loads of stuff on the carbs chasing a
non-existent problem only to find when you swap the pump you need to start again.
Saying all that I didnt know you could run dellorto's on the pinto pump successfully....
[Edited on 27/8/12 by FASTdan]
NEW danST WEBSITE NOW LIVE! Bike carbs, throttle bodies and more......
http://www.danstengineering.co.uk/
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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scoop
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| posted on 27/8/12 at 09:15 AM |
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Forgot about the pump. With everything else you've done. There lyes the problem.
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RobBrown
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| posted on 27/8/12 at 05:00 PM |
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Thanks all
Will fit a bike pump and see how we go from there. Will I need to run it through a relay or can I just wire it straight in to the main on feed?
FASTDan - Can you U2U me a price for one of your pumps please?
I came across this video which put all the jets into context with each other. Helped me anyway with my lack of understanding -
YouTubeLink
Will update this post with progress.
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