[Healeys] Rebuilt Engine Compression

[Michael Oritt]

Patrick--

Let's go back to the beginning:  When you crank the engine with one plug
removed and grounded against the engine is there any spark across the
electrode gap?

Best--Michael Oritt

On Mon, Jun 12, 2023 at 6:11 AM Patrick and Caroline Quinn <
p.cquinn at outlook.com> wrote:

> 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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