Carb Rebuild

[theduck]

We didn't run it up like that as it was clearly not right and very low on power. You could have a similar issue just not to the same extreme.

[Bob Tucker]

My experience of exhaust valves not closing properly could be heard

as an odd exhaust sound.

If the engine is running smoothly, not missing, no misfires,

then main suspect is ignition timing.

Fuel problems can generally be heard as pops & bangs

[theduck]

Only symptoms on mine was it sounded odd as you turned it over and the lack of power.

[jaimo]

It pops back through exhaust on overun quite a lot and is also got a slight hesitation when reved from idle

It revs up fine standing or seems too it feels like mainly under load the problem is the but seems to drive fine just power slow issue

Going to try stus carb on Wednesday on mine to either pin point or eliminate carb

Problem is if was ignition timing it wouldn't start as well as does

Edited April 18, 2016 by jaimo

[Guest lotusPaul]

Was this a fault before you rebuilt the carb?

[jaimo]

Yeah but not sure if worse than before

[Guest lotusPaul]

Have you done a compression test on all cylinders?

 

Have you checked valve gaps cold?

[jaimo]

125psi on all 4 cylinders none throttle test

[Guest lotusPaul]

Put some clean oil in the bores and try again.

[Peter Bell]

Could it be fuel problem? Crap in tank blocking feed, filters? Fuel hose breaking up?

[Guest lotusPaul]

http://www.rhocar.org/index.php?showtopic=29468

 

I looked at this and thought it may be of use.

 

You possibly have a few issues going on so you/we need to eliminate one at a time.

 

Work on the free stuff then look at the ones that may cost you.

 

But as you have built the carb, is it set correctly?

 

Air/fuel/compression/spark. It's all an engine needs. Unless its diesel

[jaimo]

Tried stus carb on tonight and it's the same as mine so that's carb eliminated so wondering about gearbox to diff ratios as upto 50ish and setting off can paint in 1st and 2nd but then again did 80 at least it's just since red pinning then wouldn't tick over

[theduck]

4 speed or 5 speed? Do you know what diff ratio it is? If not revs in top at 70?

 

You said it was slow off the line though? So I think it's not that. Valve clearances would be my next check.

Edited April 19, 2016 by theduck

[Guest 2b cruising]

I thought you originally said this happened after you had a little spin on a wet day.

Was it ok before that.

125 psi is very low for pinto compression figures.

Using the oil in the bores is usually used checking if valves or rings faulty. Not used when all compressions are equal.

Are you sure it is not a van or minibus engine. Or even one built for turbo fitment. Are you sure the test gauge was accurate.

If I were you I would just use it until engine change time actually comes.

Never forget your priorities though Jaimo.

If you have to work on your house and car at the same time, I'm sure you are sensible enough to pick the kit first.

[jaimo]

Yeah i am determined to be at stoneleigh and bringing my boy so 70mph is fast enough with him them bring on engine swap aa cover sorted lol