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Zink Racer
Join Date: Aug 2005
Location: Spokane WA
Posts: 2,655
Weber 40IDA question 914-6 race car

Hi, I am in the process of freshening a 914-6 tribute race car that has been sitting for quite some time and not stored properly. The motor as built by GD racing in San Bruno CA many years ago and has little time on it according to the mechanic who built the car and ran it in PCA solo a few times. The motor is a 2.4 liter and running Weber 40 IDA's. I pulled the carbs to go through them and they are sorely in need of cleaning and a rebuild kit.

The float chambers have an aluminum baffle that has been secured with some type of epoxy that was breaking down. I removed them to clean. Should I refit them or try running the car without? If I do put them back in what should I use to secure them that won't break down and gum up the carbs?

93 VFR750, 1968 R50/2
911's and 914's of various vintages and in various states of repair
Old 01-01-2020, 09:16 PM
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Fubawu's Avatar
Join Date: Jun 2013
Posts: 1,158
Well I've never had to use a baffle in the chambers. Its a cool idea if done right but it is far from needed in my opinion.
1971 911T 3.2 1971 911S 2.5
1972 911S 2.8 1972 911T 2.7
1965 911 300760 1976 911S
Old 01-06-2020, 12:57 PM
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Registered User
Join Date: Nov 2000
Location: Longmont, Colorado
Posts: 1,806
This was a very common racing modification
I run the same in my 914/6

the epoxy lasts only 10 or so years
clean it all out...
re glue or re-epoxy

the last time I did this I also asked around for a better product
I didn't find one... so ended up with fresh epoxy and hopefully 10 more years without problems.
914/6 2.0S with twin plug
all metal body panels
19quarts of oil
4 gallons of gas
and 1826 lbs (wet)
Old 02-04-2020, 09:23 AM
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jmz jmz is offline
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Join Date: Feb 2003
Location: Texas Gulf Coast
Posts: 2,638
From Paul Abbott's page:

Float Bowl Modifications - Baffled And Relieved
Baffle plates are required for racers that experience prolonged, high-G turns resulting in the fuel in the float bowl to move up the wall of the bowl and uncover the fuel inlets to the main jets, this occurs only for the carburetor on the inside of the turn, the outer carburetor will not be affected. Since baffle plates are installed on top of the bungs where the main jets are located they cover the fuel inlets to the main jets which are 8mm above the floor of the float bowls. Removal of this riser to allow fuel to feed the main jets is known as "relieving the mains" and in doing so the end user is expected to maintain a fastidiously clean fuel delivery system and to routinely check the carburetors for debris, failure to do so will lead to a case of "Race-ius interruptus". Street applications will not need/want this modification for autocross events on street tires but might be warranted for time trial events on road courses.

'74 Mexico Blue 911 3.0 EFI (Fast and Loud)
'70 914/6 Race Car (Faster and Louder)
'80 911SC Weissach 3.2 Short Stroke Hot Rod
'68 SWB 911T build in progress -The Rat
Old 02-11-2020, 11:29 AM
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