2.8L RSR Timing

Richi996 · 11-24-2009, 12:44 AM

Dear Gentlemen ,
Last week my 2.8 RSR ish was brought back to life after 15 years

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The Engine is built around a Correct 2.7 RS engine with Carrera 6 cams , Weber 46IDA's and Marelli Twin Spark . Now that the beast is up and running i would like to check the Ignition timing and also know the correct Dwell angle or points gap for this spec of Engine . Any Information can only make me happier then i am feeling right now .........

Richi996 · 11-25-2009, 12:24 AM

Is it something i have said http://forums.pelicanparts.com/support/smileys/shake.gif[/img]. Surly someone can give me a few hints on the correct setup for this type of Engine . I have purchased the Bible " How to Rebuild & Modify Porsche 911 Engines" but in the back of the book i could not find any Tech info regarding the Timing on a 2.8 Engine .
Cheers Richard

eapcpa · 11-25-2009, 07:50 AM

There are several folks that might be helpful, we are in the week of our Thanksgiving holiday and things tend to slow down here until after Thursday. Wait a bit and try to bump it back up in a few days.

Steve@Rennsport · 11-25-2009, 07:59 AM

Quote:

Originally Posted by Richi996

Dear Gentlemen ,
Last week my 2.8 RSR ish was brought back to life after 15 years

[img].
The Engine is built around a Correct 2.7 RS engine with Carrera 6 cams , Weber 46IDA's and Marelli Twin Spark . Now that the beast is up and running i would like to check the Ignition timing and also know the correct Dwell angle or points gap for this spec of Engine . Any Information can only make me happier then i am feeling right now .........

Ignition timing is 26-28 degrees at 6K.

I need to look up the dwell settings. Those are NOT easy to do without a distributor machine as the values are different for each set of points.

Richi996 · 11-25-2009, 09:50 AM

Thanks guys .... I'm sorry ..my Father did teach me that patience is a virtue .
I think the excitement of hearing my engine run has gone to my head .
Have a great Thanks giving ... Family and friends are very important and i will catch up with you all soon.

Cheers Richard

Richi996 · 12-02-2009, 11:38 AM

Dear Steve ,
did you manage to find out the gap for the points .I am a little confused as i thought that all 4 points had the same gap value and that the second set are only a back up ? I love the learning curve

Cheers Richard

Walt Fricke · 12-02-2009, 01:23 PM

It seems dual points serve to increase the dwell angle, and also are overall more robust. The points are set up to open/close at two slightly different points. This site may be helpful:

Mallory Dual Points distributor, how it works, and Why Dual?

You can increase dwell on a single point system by reducing the gap, but at some point that causes its own problems.

Doesn't tell you what the figure you want is, though.

Walt

Richi996 · 12-02-2009, 11:43 PM

Thanks for the info Walt ,
i also found a web site with nice pictures and some information regarding Twin Spark Home but values and how to set the points correctly for a Marelli seem hard to find .I think they even have a picture of the Maschine Steve was on about which i have never seen in my life .
Last weekend i put a dwell meter on one side and measured a dwell of exactly 20 degrees ... reving the engine the dwell did not move at all which i guess means my distributor is in good health at least ... I will be at home again this weekend and measure the dwell on the other side to see if they are the same .
Again reading through a few posts some say the dwell is not so important with CDI but its nice to know how to set it on a more complicated distributor.

Thanks again for your replies and time

Richard