RS2000 Help

cram72 · 24-03-2009, 07:01 PM

Recently purchased a 79 RS, is running a new motor that has covered 5k on a rebuild, big valve head and crow high lift cam. The motor was running twin 45's that have been removed due to car being defected and having an inspection. Stock weber carb back on but runs like a dog under 2.5 thousand, above that heaps of powers. Timing is perfect so is cam timing but it seems to be pumping fuel in via the secondary at idle, any ideas? I'm on my second weber with same symptoms, is it a jet issue? Also can anyone recommend a place in Adelaide that can tune up weber carbs without me needing to sell a kidney?

Engine Guy · 02-04-2009, 07:54 PM

where in Adl are you?

rag top · 02-04-2009, 08:18 PM

What are the cam specs?

Is it running the stock fuel pump?

johno9184 · 02-04-2009, 09:14 PM

hey mate. ive just put rebuilt 2ltr in with stock carby. my cam is pretty big and ive got the same issues. bit of a flat spot about 2grand and then heaps of go. ive just think its the way it is. im putting twin 45's on it in the next week or 2 and that should fix it

Engine Guy · 03-04-2009, 10:15 AM

Not quite sure of the availability of weber jets here...but when I was doing this kind of work in the UK I overcame these issues by correctly setting up the carb and then altering jetting through the rev range...

Puzzlescort · 03-04-2009, 10:45 AM

an old trick we used for rallying with the std 32/36 weber carby was to put V6 linkages on the carby to make it a constant 2 barrel carb instead of a progressive 2 barrel, this did seem to work better at lower rpm - best thing is it looks stock standard under the bonnet - tuning and jetting will be still need to be done, might be a good option before putting twins back on it....

Engine Guy · 03-04-2009, 10:57 AM

I threw loads of these old twin barrel carbs away a few years ago.... :-(

The OP might want to try and find the original carb from an old Essex 3.0 V6 motor, they used a twin barrel - rather than just the linkage
in fact lots of old V6 (UK Based fords used it)

cram72 · 05-04-2009, 09:49 AM

I'm in Adelaide Hills, Thanks for the advice. I talked to about six places and they all said pull out the cam due to overlap and lack of vacumn. Did that and one problem solved and up jumped the next, rattles like crazy. It has after market followers so i'm hoping if I change those back to stock problem solvered, no flat lines now and idles fairly good. Will start a project car thread if I could only work out how to post photo's? Cheers.

Engine Guy · 05-04-2009, 11:07 AM

Yeah followers in these motors are a weak point due to lubrication problems (oil spray bar)

If it din't rattle before then it's probably due to an adjustment issue..

I like these motors, when I was in the UK, I ran a business that did quite a bit of development work on them, mostly for Formula Ford 2000...

What was the overlap of the cam you took out?

Cheers

cram72 · 05-04-2009, 01:07 PM

No idea on the overlap? When I sneak out to the shed tonight under the cover of darkness I'll get the details of the cam and post them.

As for adjustment, they are gapped up as per the manual however the followers and posts are aftermarket and have been modified to fit, I have a stock set of Ford ones so once they are on I hope it fixes the problem.

I'm sure this car would have flown on the twin 45's however as it has to be inspected at regency park it's all gotta go back to standard. The whole motor is new and has only covered 5k since full rebuild but has sat in a shed for five years, the oil spray bar is all fine as I turned it over minus the rocker cover to check. The followers just don't seem to fit right and are very loose even on the correct gaps?

It didn't rattle on the old cam so i'll just suck it and see, frustrated cos once this is fixed she's ready to go and get the defect removed and then become my everyday driver! Love the RS!!!!!!

smciner1 · 07-04-2009, 02:58 PM

Quote:

Originally Posted by Puzzlescort

an old trick we used for rallying with the std 32/36 weber carby was to put V6 linkages on the carby to make it a constant 2 barrel carb instead of a progressive 2 barrel, this did seem to work better at lower rpm - best thing is it looks stock standard under the bonnet - tuning and jetting will be still need to be done, might be a good option before putting twins back on it....

There was a 2 Barrell Down Draft Webber that you could buy that looked very much like a Standard one with Synchronous Linkages, Dad had one on his RS20000 back in the day. I can't remember the name of it.

feral · 08-04-2009, 11:33 AM

Quote:

Originally Posted by smciner1

There was a 2 Barrell Down Draft Webber that you could buy that looked very much like a Standard one with Synchronous Linkages, Dad had one on his RS20000 back in the day. I can't remember the name of it.

Yep, a 38 DGAS off a V6 capri, slightly larger with 38 mm barrels and a synchronous linkages. I have one that I am about to bolt up to my RS, and had one on my old RS. They are rare and pop up on ebay here and there or you might be able to source one out of the uk.

whooligan · 08-04-2009, 09:04 PM

38 DGAS are ideal for mildly worked pintos. I ran a 40 DFAV on my RS and it went like stink. I also ran a 38DGSM which I think were on Falcons. These are a cheaper alternative to a 38 DGAS and a lot more common. I've just bought one that I'm going to try and tune on my work 1600 Escy Coupe.

oysta · 12-04-2009, 02:59 PM

Has anybody considered, or have experience in, modifying the 32/36 as an alternative to changing the carb. David Vizard's books gives a few good pointers and I've also come across a few other forums (non-escort) which outline how to go about it. I was surprised at the increase in flowrate figures through the carb after modification. Just off the top of my head: knife-edge the butterflies and narrow the shafts, remove choke assembly, increase bore (using flapper disc), round off the edges of the air horn, etc.
Would be much cheaper and there's a lot more 32/36 carbs around.
Opinions?

JordyCharlieBoz · 12-04-2009, 09:49 PM

I was told the carby off a Capri GTV6 3000, a 40 DFAV, looks stock enough to pass any roadworth. That is unless the guy lookn under your hood know what should be there. I have recently purched a worked 40DFAV. Hasnt got here yet but it should go great guns =)

cram72 · 13-04-2009, 08:16 PM

Thanks for the advice, ripped out all the modified stuff and put her back to stock, purring and took her for her first drive through the paddocks, very nice. Owes me $3k fully rebuilt, just hope the boys at Regency pass her, should do though cos I've done it all proper. Will start a thread in project car but just can't work out the photo thing, keeps telling me they are too big?