[TR] TR4 engine question

[Tony Drews]

The ignition timing deal is more about creating hot spots when the 
engine is running.  Too much advance causes pre-ignition which can cause 
stuff to get hot enough to ignite the fuel.  One source of that could be 
a piece of the head gasket protruding into the combustion chamber.

- Tony

On 2/26/2019 10:14 AM, Wbeech at flash.net wrote:
> Same problem here with the TR3 motor in the Morgan, but not the TR3. 
>  I don’t see how ignition timing could affect it as it is turned off. 
>  I used to hear it was due to carbon buildup continuing to ignite 
> fuel, but that doesn’t fly for a fresh engine.
>
> I’m going to lean the mixture a little and see if that makes any 
> difference.  Till then, Dave’s method of easing the clutch out seems 
> to be the accepted workaround.
>
> Bill
> TS30800L
>
> Sent from my DynaTAC 8000X
>
> On Feb 26, 2019, at 8:46 AM, Andrew Uprichard 
> <auprichard at uprichard.net <mailto:auprichard at uprichard.net>> wrote:
>
> Assuming everything else (timing, carburation) is set, do you have an 
> electric fan?  My TR3 runs on if the fan is still on when I turn the 
> ignition off.
>
> Andrew Uprichard
>
> Jackson, Michigan
>
> *From:*Triumphs [mailto:triumphs-bounces at autox.team.net] *On Behalf Of 
> *DAVID MASSEY
> *Sent:* Tuesday, February 26, 2019 7:34 AM
> *To:* trguy75 at gmail.com <mailto:trguy75 at gmail.com>; 
> Triumphs at autox.team.net <mailto:Triumphs at autox.team.net>
> *Subject:* Re: [TR] TR4 engine question
>
> First off, congratulations on your win.
>
> Secondly, do what I do.  Put the car in fourth gear and let the clutch 
> out as you switch off.  Be sure to set the brake first.  My TR6 
> diesels even with the anti-run-on valve.  So does the TR3.
>
> Dave
>
> -----Original Message-----
> From: Jim Henningsen <trguy75 at gmail.com <mailto:trguy75 at gmail.com>>
> To: 'triumphs' <Triumphs at autox.team.net <mailto:Triumphs at autox.team.net>>
> Sent: Mon, Feb 25, 2019 9:41 pm
> Subject: [TR] TR4 engine question
>
> Fresh TR4 engine that does that "dieseling" thing after you turn off the
>
> key. It like it tries to keep running but with a cough and then 
> stops.  The
>
> TR6 has an anti-run on valve to help with that.  What do I treat on a TR4
>
> motor? P.S.  So proud that after 8 years putting my 4 back together stock,
>
> I won first place in the sports car group at the AACC winter national.
>
> Thanks
>
> Jim Henningsen
>
> Ocala, FL
>
> 61 TR3A
>
> 62 TR4
>
> 75 TR6
>
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