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MERCEDES W107 The R/C107 coupe and roadster from 1971-1989 (280SL, 280SLC, 300SL, 350SL, 350SLC, 380SL, 380SLC, 420SL, 450SL, 450SLC, 450SLC 5.0, 500SL, 500SLC, 560SL)

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Old 11th April 2013, 05:24 PM
sean sherry sean sherry is offline
Join Date: Jan 2012
Location: sydney
Posts: 1,630
Default vacuum retard

On a Euro spec 110 engine I'm in two minds about the merits or otherwise of plugging the vacuum retard line. It retards the timing at idle and cuts out as the vacuum drops when the throttle is opened and the engine is under load........ BUT..
does it result in a conflict with the advance vacuum when running on a light throttle
Ie., on the highway ? ? I realise that its' function is to raise the idle speed when the Air Con is on by blocking the vacuum to the distributor. The static timing is 12% BTDC and the engine feels ok on the road. Sean
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Old 11th April 2013, 08:06 PM
Helmet Helmet is offline
Join Date: Oct 2011
Location: Sydney
Posts: 1,208
Default Re: vacuum retard

If it feels OK on the road why mess with it, I'm sure the engineers in Germany have designed it that way for a good reason.
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Old 12th April 2013, 09:27 AM
sean sherry sean sherry is offline
Join Date: Jan 2012
Location: sydney
Posts: 1,630
Default Re: vacuum retard

Point taken Helmet.
I'm mindful of the comment to the teen who was eager to improve his Honda V Tech Engine and was asked what more did he know than 40,000 Honda Engineers !
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