bonerp
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| posted on 23/4/04 at 07:20 AM |
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Spitting back through carb mouths
Hi,
I have Twin DHLA 40s on my Tiger Cat (pinto) and it spits back through the mouths of the carbs.
I know I need to get it set up on the rolling road but I understand this is basically down to it running weak.
Can anyone guide me as to maybe trying to adjust this out a bit prior to having a rr session. I know jets etc might need changing but if theres
anything I could do I may as well try.
I have not tuned carbs before so clear instructions pls!?!
By the way the car seems to run ok on the road, maybe a little hesitant when getting on the gas though.
Paul
[Edited on 23/4/04 by bonerp]
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NS Dev
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| posted on 23/4/04 at 09:02 AM |
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I've emailed you a basic carb setup instruction sheet which I use, written by Dave Andrews
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britishtrident
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| posted on 23/4/04 at 10:35 AM |
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First thing to check is the carb bolts aren't over tightened ---20 to 25 thou gap at the thackery spring washers.
Then check all the jets are clear and tightened down properly..
Particularly check the accelerator pump jets are clear and working.
Then synch the carbs and do the idle mixture setting -- with one choke per cylinder engines I use a colour tune to find the initial idele mixture
screw setting for each barrel -- then adjust as required equally on all cylinders.
If it spitting back it indicates a weak mixture so in addition to the above check the float height and that fuel is flowin freely into the float
chambers.
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macspeedy
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| posted on 23/4/04 at 03:45 PM |
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i heard that if the exhaust is restrictive it can cause this..
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NS Dev
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| posted on 23/4/04 at 04:24 PM |
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As I mentioned further up the thread, I stongly suggest anybody trying to set up webers or dellortos uses this
link>>http://hometown.aol.com/DVAndrews/index.htm
This will get you going much quicker than messing about any other way!!
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stephen_gusterson
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| posted on 23/4/04 at 06:48 PM |
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dave ashurst of this parish nearly lost his car in a big fire when his carbs spat back and set the foam filter alight.
beware
atb
steve
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bonerp
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| posted on 26/4/04 at 07:21 AM |
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I had the car set up by a mobile tuning bloke ages ago so the emissions were ok.
On Friday I richened it up a lot but it still tends to spt back through the 4th cylinder, but not as bad.
Also it hesitates a little when getting on the gas which suggests it does in fact need rejetting via a rolling road session so as soon as I have a
bung spare I will book it in.
Got me round Castle Coombe on Saturday though (£30 for 5 laps!!!!! WTF??!?!?!). Excellent on track although did understeer a tad and think tracking
may be out a little.
Paul
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NS Dev
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| posted on 26/4/04 at 04:33 PM |
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how'd you get on with Dave Andrews sheet?
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bonerp
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| posted on 27/4/04 at 11:23 AM |
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NS,
As above
But then the trouble is number 4 cylinder and thats the one I tried to polish/port! I need a new head anyhow so will get it rolling road tested once
I get the new head on I thunk!
Paul
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