[Healeys] Rebuilt Engine Compression

[Kees Oudesluijs]

Hello Patrick,


Between 5 and 10lbs can barely be called a compression so something 
serious is amiss. It should be well above 5bar for any engine. Depending 
on C-R and wear. Even with a slightly burned or not lapped in valve.

If it is not the clearances it really looks like a head off job to 
investigate and sort the valves. Luckily not too big a job on the A-H.


Cheers,
Kees



Op 12-6-2023 om 12:01 schreef Patrick and Caroline Quinn:
>
> Hello Kees
>
> Thank you for your response.
>
> I’m afraid I tried all that. Plugs are wet! Even made sure the earth 
> strap was earthing properly. Also used a starting fluid called “Start 
> ya Bastard!”
>
> I did a compression test and each cylinder was between 5 and 10 lbs. 
> Not quite what it should be.
>
> When the engine expired last year, the first thing I did was to have 
> the cylinder head pressure tested. It was okay, but I suspect that 
> when they put it back together the valves were not lapped in. The head 
> comes off next weekend to check.
>
> Hoo Roo
>
> Patrick Quinn
>
> *From:*Healeys <healeys-bounces at autox.team.net> *On Behalf Of *Kees 
> Oudesluijs via Healeys
> *Sent:* Monday, June 12, 2023 6:43 PM
> *To:* healeys at autox.team.net
> *Subject:* Re: [Healeys] Rebuilt Engine Compression
>
> Did you check the firing order, camshaft timing, valve clearances? 
> Does the distributor shaft turn when the engine is turning over?
>
> Check the bypass wiring of the ballast resistor. Check the correct 
> wiring of the coil, you would not be te first to have the polarity wrong.
>
> The compression on a freshly rebuild engine is lower than on an engine 
> that has been properly run in. It also depends on the tolerances and 
> surface finishes used in the rebuild. Assuming that it is a proper 
> rebuild the compression should not be an issue here. Whatever the 
> compression the engine should start.
>
> Timing and fuel cannot be spot on as the engine is not running and 
> fine tuning of mixture and ignition should be made on a running 
> engine.  It is however not an issue either as you set ignition 
> initially statically as you do with the adjustment of the carbs and it 
> should at least run on that.
>
> Are the spark plugs wet or dry after churning? Try spraying some easy 
> start fluid (mainly Aether) into the throat of the carbs during 
> turning over and see if you get some life.  If so it is a fuel issue.
>
> Good luck.
>
> Kees Oudesluijs
>
> Op 12-6-2023 om 07:41 schreef Patrick and Caroline Quinn via Healeys:
>
>     Hello
>
>     No amount of churning over with a new battery will induce the
>     BN3’s rebuilt engine to fire. Even towing the car up and down the
>     road failed to instill any life into the engine.
>
>     Everything is spot on – timing, spark and fuel.
>
>     Anyone have an idea as to what the compression be on a rebuilt
>     engine should be?
>
>     Many thanks
>
>     Patrick Quinn
>
>     Blue Mountains, Australia
>
>
>
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