Lack of power...

[dollysteve]

I was messing about with my 1850 last night and I thought i`d try out my new compression tester, <br>
acccording to my guage all the compression are about even and certainly within tolerance. <br>
I wrote them down and just to be sure borrowed another tester off of a neighbour and they<br>
came out about the same as my new tester, this obviously indicates a fault with my colleagues<br>
tester, as I was now quite excited I thought i`d take it for a drive. I remember after swapping the carbs <br>
for a set of non waxstat HS4`s I was having trouble tuning them, it seems no matter what I do the rear carb has no effect on the running.<br>
I can wind the jet almost right the way down and it doesn`t make the slightest difference, there is fuel <br>
coming through the jet but i`m guessing not nearly enough. It actually drives ok, ish, when driving normally<br>
but under hard accelaration the power drops off and she refuses to rev. My first thoughts were fuel pump, <br>
i`m also now thinking that maybe the float needle valve is sticking. Ignition wise the plugs are new NGK iridium ones,<br>
new magnecor leads and the points, cap and rotor arm are all new. (electronic ignition triggered by points)<br>
I`m going to take the electric fan off and revert to the original for now until I drop the TR7 lump in as that is in the process of being stripped<br>
and re-built. I have a spare set of TR7 carbs and a manifold kicking about so I may put them on but I would like to take the car to the Goodwood<br>
revival next weekend so I need a quick fix. Any thoughts!!!!

<p>1976 Dolomite 1850 HL Auto<br>
1979 Dolomite 1850 HL Man o/d<br>
1989 Noisy Mini 1340 <br>
1994 VW Golf GTI</p><i></i>

[Jon Tilson]

One carb is quite capable of keeping a dolly running around on its own...as I found out when the spindle clamp went loose on our TR7 one once...only one throttle was opening. Sounds though like yous is opening but is fuel-less on one carb. This would lead to ever weaker mixture as you open it up. I know you think you can see fule in the jet but I bet if you took it off and blew through it you would see what wrong.<br>
Ive had kinked pipes from jet to float bowl on a number of occasions. EIther that or your float valve on that carb is partially blocked. Had this on my Rover V8 the other day. Seriously gutless heap when it happened.<br>
Jonners

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[Silvery]

I had problems with one of the carbs on the hl. Turned out the jet assembly was totally seized to the bearing bit it sits in. So no matter how much I would the nut up or down, the jet stayed exactly where it was.<br>
<br>
Worth double checking it moves easily (just pull the jet down, should move quite easily) on each carb.

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[tinweevil]

Does sound like a blockage in the carb. Other thoughts: Are the carbs balanced? Any airleaks after the carb? Try tuning with 2 colourtunes. I do this as a matter of course now even with the wifes single carbed mini, it can be revealing.<br>
<br>
Tinweevil

<p>1978 <!--EZCODE LINK START--><a href="http://www.triumphowners.com/704">Dolomite Sprint</a><!--EZCODE LINK END--><br>
1968 <!--EZCODE LINK START--><a href="http://www.triumphowners.com/705">GT6 II</a><!--EZCODE LINK END--><br>
1972 Spitfire IV<br>
39 anorak points on the Nicholas scale<br>
</p><i></i>

[bodgerben]

Steve,<br>
<br>
I have a set of 1850 carbs - still on a 1850 engine in my engine not far from you - Liphook - you are more than welcome to swap one or more over this weekend if that helps.<br>
<br>
They are on an 1850 engine I used up to a few months ago - got a nice set of alloy mounts on them - yes 1 1/5" not 1 3/4".<br>
<br>
I'm taking my Toledo to Goodwood next weekend as well.<br>
<br>
Ben<br>
<br>
<!--EZCODE LINK START--><a href="http://www.dollysprint.com" target="top">www.dollysprint.com</a><!--EZCODE LINK END--><br>
<br>
<br>


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[dollysteve]

The jets are free enough. I have tuned them using the method in the manual, wound the jets down level. I even took the dashpots off to check so the jets are definatley free enough and I always use a carb balancer to set the throttles so they are well balanced enough. I have a couple of sets of HS6`s and TR7 manifolds, one of which I have just overhauled ready for my TR7 conversion. I think i`ll put them on. I was hoping to avoid this but if I want to take the car to Goodwood it might be my best option. Ben it might be an idea if I can get a carb off you, atleast that way I won`t have to mess about with swapping manifolds. I could pick it up next week if thats ok or perhaps get a mate to grab it, he lives in Haselmere. What sort of money do you want for them. Are they waxstat or fixed, the ones on my car are fixed.

<p>1976 Dolomite 1850 HL Auto<br>
1979 Dolomite 1850 HL Man o/d<br>
1989 Noisy Mini 1340 <br>
1994 VW Golf GTI</p><i>Edited by: <A HREF=http://p206.ezboard.com/bthetriumphdolo ... lysteve</A> at: 9/9/05 8:21 am<br></i>

[bodgerben]

Steve,<br>
<br>
As you already have a set of HS6's how's about you just borrow the carb(s) till you swap them over - I've just done the same as you - I have a set of rebuilt HS6's and TR7 manifold - so I'm in no rush to have them back - it's probably easier for me to take the whole manifold off and you can grab the bits you need - and return them when you have done the swap. How does that sound?<br>
<br>
Ben.<br>
<br>
<!--EZCODE LINK START--><a href="http://www.dollysprint.com" target="top">www.dollysprint.com</a><!--EZCODE LINK END-->

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[bodgerben]

Forgot to say - Fixed jets.<br>
<br>
email me on ben at dollysprint dot com<br>
<br>
Ben<br>
<br>
<!--EZCODE LINK START--><a href="http://www.dollysprint.com" target="top">www.dollysprint.com</a><!--EZCODE LINK END-->

<p></p><i>Edited by: <A HREF=http://p206.ezboard.com/bthetriumphdolo ... dgerben</A> at: 9/9/05 8:34 am<br></i>

[dollysteve]

Ben,<br>
<br>
You should have e-mail.

<p>1976 Dolomite 1850 HL Auto<br>
1979 Dolomite 1850 HL Man o/d<br>
1989 Noisy Mini 1340 <br>
1994 VW Golf GTI</p><i></i>

[dollysteve]

I had to drive my 1850 to work today due to the weekends events with my Golf. She fired straight away this morning and actually after a while ran very well and I had lots of fun, however on my way home tonight it ran like a pig, coughing, spluttering and only running on 2 cylinders. I dipped the oil and had a snif and there was a strong smell of petrol. I think the diaphragm in the fuel pump is knackered, now i`m wondering if this could be the cause of my running problems and also why turning the jet on the rear carb has no effect on the running.... what does everyone else think???. Secondly. I noticed some fuel seeping from around the throttle spindle, what could this be???? I`m a little confused. I`m sure the carbs are knackered so lets hope bens go some way to sorting it out.

<p>1976 Dolomite 1850 HL Auto<br>
1979 Dolomite 1850 HL Man o/d<br>
1989 Noisy Mini 1340 <br>
1994 VW Golf GTI</p><i></i>

[Jon Tilson]

to swap the pump from your other one init? New ones come up on the bay all the time...usually sub a tenner.<br>
You have to watch cos some have a longer arm and need a spacer.<br>
<br>
Its possible to remove jet and float bowl as an assembly without taking the carb off. Ive started doing this as it means spilling a lot less fuel. You can get at the retaining nut 7/16 I think from underneath, release the float chamber and the jet simply drops out.<br>
<br>
Jonners

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