[Healeys] Rebuilt Engine Compression

[Patrick and Caroline Quinn]

Thank you Michael

Yes we have done all that.

Had spark, which improved with new points and condenser.

Hoo Roo

Patrick

From: Michael Oritt <michael.oritt at gmail.com>
Sent: Monday, June 12, 2023 9:39 PM
To: Patrick and Caroline Quinn <p.cquinn at outlook.com>
Cc: Kees Oudesluijs <coudesluijs at chello.nl>; healeys at autox.team.net
Subject: Re: [Healeys] Rebuilt Engine Compression

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<mailto: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<mailto: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<mailto: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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