Slowing down going up hill

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SvMinor
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Slowing down going up hill

Post by SvMinor »

Had the car out for a fun today and it slowed down going up hill,doesnt matter if its a steep hill or not,also engine revs high on idle.Have not had the car out much since replacing the crank.

Cheers Mark

bmcecosse
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Post by bmcecosse »

Well - you can reset the idle speed! My cars all slow down on hills - I think it's something to do with Gravity.........
If you think the 'slowing down' was excessive - probably needing a good tune up after all the upheaval.
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SvMinor
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Post by SvMinor »

I checked the manual about setting the idle,(adjust 1 nut under the carb and 2 screws)

bmcecosse
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Post by bmcecosse »

That's it - but also make sure the throttle cable is not too tight - must be a tiny bit of 'slack' at idle. And of course - make sure the choke cable likewise has some slack at the carb when pushed right in.
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SvMinor
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Post by SvMinor »

Maybe thats the problem,the cables being too tight.would this affect going up hill?

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Post by Peetee »

Did you refil the carb dashpot?
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andrew.searston
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Post by andrew.searston »

what will happen if the throttle cable is to tight??? got me thinking
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SvMinor
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Post by SvMinor »

No didnt refill the dashpot.didnt do anything to it when I replaced the crank.I disconnected it and set it behind the fuel pump in the engine bay.I didnt dismantle it in anyway.

mike.perry
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Post by mike.perry »

The brass nut under the carb is the mixture adjustment. If the engine is running smoothly then do not touch it. Unscrew the plastic top on the carb and check that there is oil inside. If not then top up with a light oil such as 3 in 1.
There is a vertical tickover speed adjusting screw on the side of the carb, screw it upwards slightly and it will slow the engine revs. The other adjusting screw sets the engine speed with the choke out. It should be adjusted so that it is just touching the cam.
If the car is slowing down more than usual on hills then it could be that the timing is out. Have you touched the distributor?
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SvMinor
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Post by SvMinor »

I had to rearrange the leads on the dizzy,because after refitting the engine it wouldnt start and Roy amongst others suggested the timing was out 180 degrees.

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Post by PSL184 »

andrew.searston wrote:what will happen if the throttle cable is to tight??? got me thinking
Potentially you could snap the cable....
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mike.perry
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Post by mike.perry »

If the timing was 180 out then the engine would not run, it would splutter and backfire. If the accelerator cable was too tight then it would keep the tickover revs too high. There needs to be a little bit of slack in the cable.
When you have sorted the tickover then test run it up the hill and if it is still slow then check the points gap, mark the position of the carb, set the vernier adjuster to midway, loosen the clamp and turn the distributor slowly until you have the fastest tickover. Tighten the clamp and you should be able to get any fine adjustment on the vernier
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bmcecosse
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Post by bmcecosse »

The timing WAS 180 degress out - but swapping the leads around sorted that. However - there is the possibility that the cam timing was not put back completely correctly - ie the dots were maybe not correctly aligned ? That would certainly affect the running of the engine - but let's assume it's all ok for now - and try everything else first! If cable too tight - then the throttle may not be able to fall back to the correct idle position - there needs to be a tiny bit of slack at idle.
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SvMinor
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Post by SvMinor »

Yeah Roy,The dots were lined up with each other,I recon its the throttle cable being too tight.I did tighten it a bit when it was refitted.

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Post by bmcecosse »

Aye - well that would explain the high idle speed- but not of course the apparent low power problem - causing it to slow on hills. Let us know after you slacken the throttle cable slightly.
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SvMinor
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Post by SvMinor »

No problem will try it tomorrow,weather permitting

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Post by beechford »

dont suppose the clutch is starting to slip ?
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Post by frosty »

Do a compression test and let us know the figures of each pot.
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SvMinor
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Post by SvMinor »

Slackened the throttle cable but havent had a chance to get the car out.bad snow over here.Clutch is fine its not slipping

SvMinor
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Re: Slowing down going up hill

Post by SvMinor »

Loosened the Dizzy clamp and turned the dizzy a bit, the engine reved faster(as mentioned before)and the car pulls and pulls up hill,its like a new car,the difference in the power between now and the last time I took her out is like day and night,(Cant believe the difference in power),

I now need to get the Air and Fuel mix sorted now,

Any suggestions on how to get it just right?

Cheers Mark

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