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MdR MdR is offline
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Question Weber 40IDS carbs on 3.0SC motor?

I know very little about jetting carbs - Can I safely run stock Weber 40IDS carbs on a stock '83 euro 3.0 SC motor with SSIs and early style two in one out exhaust?

I believe the carbs are in standard form 130 mains 55 idles 32 chokes F3 emulsions as listed here Porsche 40IDA 3C Weber

If not what jetting/chokes/emulsions would be suggested? If required where can I get parts from?
Thanks
Martin

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Martin Rogers - West Sussex, England
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Old 05-28-2010, 05:57 AM
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search weber jetting, plenty to read. here's one i posted.

Weber jetting 3.0 SC
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Old 05-28-2010, 06:42 AM
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Those carbs could work fine with that engine. BA recommends in his book as a starting setup for a 3.OL:
34mm venturis
F3 emulsion tubes
160 main jets
175 Air correction jets
60-65 idle jets (possibly bigger, TBD by driving test)

Steve Weiner from Rennsport Systems in the post linked above says:
"I'd start with 36mm venturis, 155 mains, 180 A/C's and 55 idles. F3 emulsion tubes are best..."

I have no idea about Euro suppliers for Weber parts.

YMMV,
TT
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Last edited by ttweed; 05-28-2010 at 06:51 AM..
Old 05-28-2010, 06:45 AM
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Weber 40 on Euro 3.0 sounds good to me.

Some people use a more agressive cam with carbs.
I'd definitally have the distributor re-curved to run without vacuum for better performance.

Euro CR is 9.8 : 1, I think. With SSI's etc., it should roar.
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Old 05-28-2010, 06:51 AM
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MdR MdR is offline
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Quote:
Originally Posted by ttweed View Post
I have no idea about Euro suppliers for Weber parts.
Thanks Guys
How about US Weber parts suppliers? Who would you suggest? Jets are small enough for cheap shipping

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Martin Rogers - West Sussex, England
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Old 05-31-2010, 12:39 AM
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